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(Please send all additions to the following list to David W. J. Thompson davet@atmos.colostate.edu)
Aanes, R., B.-E. Saether, F.M. Smith, E.J. Cooper, P.A. Wookey, and N.A. Oritsland, 2002: The Arctic Oscillation predicts effects of climate change in two trophic levels in a high-arctic ecosystem.
Ecology Letts., 5, 445-453.
Allen, M.R., and W.J. Ingram, 2002: Constraints on future changes in climate and the hydrologic cycle.
NATURE, 419, 224-+.
Appenzeller, C., T.F. Stocker, and M. Anklin, 1998:
North Atlantic oscillation dynamics recorded in Greenland ice cores
Science, 282, 446-449.
Appenzeller, C., A.K. Weiss, J. Staehelin, 2000:
North Atlantic oscillation modulates total ozone winter trends
Geophys. Res. Lett., 27, 1131-1134.
Arblaster, J.M., and G.A. Meehl, 2006: Contributions of external forcings to Southern Annular Mode trends.
J. Climate, 19(12), 2896-2905 .
Bauer, E., 2001: Interannual changes of the ocean wave variability in the North Atlantic and in the North Sea.
Climate Res., 18, 63-69.
Belgrano, A., 2002:
Where is the climate?
Trend. Ecol. Evolut., 17, 13-14.
Bonsal, B.R., and T.D. Prowse, 2003: Trends and variability in spring and autumn 0 degrees C isotherm dates over Canada.
Climatic Change, 57(3), 341-358.
Brabson, B.B., and J.P. Palutikof, 2002: The evolution of extreme temperatures in the Central England temperature record.
Geophys. Res. Letts., 29(24), doi:10.1029/2002GL015964.
Brandefelt, J. and E. Kallen, 2004: The response of the Southern Hemisphere Atmospheric Circulation to an Enhanced Greenhouse Gas Forcing. J. Climate, 17(22), 4425-4442.
Broccoli, A.J., T.L. Delworth, and N.C. Lau, 2001:
The effect of changes in observational coverage on the association between surface temperature
and the Arctic oscillation.J. Climate, 14, 2481-2485
Bronnimann, S., J. Luterbacher, C. Schmutz, H. Wanner, and J. Staehelin, 2000:
Variability of total ozone at Arosa, Switzerland, since 1931 related to atmospheric circulation indices
Geophys. Res. Lett, 27, 2213-2216.
Butchart, N., et al., 2000:
J. Climate, 13, 2142-2159.
Butler, A.H., D.W.J. Thompson and K.R. Gurney, 2007: Observed Relationships between the Southern Annular Mode and Atmpospheric Carbon Dioxide.
Glob. Bio. Cycles, 21, GB4014, doi:10.1029/2006GB002796.
Cai, W., 2006: Antarctic ozone depletion causes in intensification of the Southern Ocean super-gyre circulation.
Geophys. Res. Letts., 33, L03712, doi:10.1029/2005GL024911.
Cai, W., and P.H. Whetton, 2001: Modes of SST variability and the fluctuation of global mean temperature.
Clim. Dynam., 17, 889-901.
Cai, W., G. Shi, T. Cowan, D. Bi, and J. Ribbe, 2005: he response of the Southern Annular Mode, the East Australian Current, and the southern mid-latitude ocean circulation to global warming.
Geophys. Res. Letts., 32, L23706, doi:10.1029/2005GL024701.
Cai, W.J., P.H. Whetton, and D.J. Karoly, 2003: The response of the Antarctic Oscillation to increasing and stabilized atmospheric CO2.
J. Climate, 16, 1525-1538.
Cassou, C., and L. Terray, 2001:
Oceanis forcing of the wintertime low-frequency atmospheric variability in the North Atlantic European sector: A
study with the ARPEGE model.
J. Climate, 14(22), 4266-4291.
Cavazos, T., 2000: Using self-organizing
maps to investigate extreme climate events: An application to wintertime
precipitation in the Balkans
J. Climate, 13, 1718-1732.
Cazenave, A., C. Cabanes, K. Dominh, and S. Mangiarotti, 2001: Recent sea level change in the Mediterranean sea revealed by Topex/Poseidon satellite altimetry.
Geophys. Res. Lett., 28, 1607-1610.
Chang, E.K.M., and Y.F. Fu, 2002:
Interdecadal variations in Northern Hemisphere winter storm track intensity.
J. Climate, 15(6), 642-658. Chen, T.-C., and M.-C. Yen, 1997: Interdecadal variation of the Southern Hemisphere circulation. J. Climate, 10, 805-812. Cherry, J., H. Cullen, M. Visbeck, A. Small, and C. Uvo, 2005: Impacts of the North Atlantic Oscillation on Scandinavian Hydropower Production and Energy Markets.
Water Resource Management, 19, 673-691, doi:10.1007/s11269-005-3279-z.
Comiso, J.C., 2001: Variability and Trends in Antarctic Surface Temperatures from In Situ and Satellite Infrared Measurements.
J. Climate, 13(10), 1674-1696.
Corti, S., F. Molteni, T.N. Palmer, 1999:
Signature of recent climate change in frequencies of natural atmospheric circulation regimes
Nature, 398, 799-802.
Dai, A., T.M.L. Wigley, B.A. Bolville, et al., 2001:
Climates of the twentieth and twenty-first centuries simulated by the NCAR climate system model.
J. Climate, 14, 485-519.
Delworth, D., and K. W. Dixon,
2000: Implications of the recent trend in the Arctic/North Atlantic Oscillation
for the North Atlantic thermohaline circulation. J. Climate, 13, 3721-3727
Delworth, T.L., and M.E. Mann,
2000: Observed and simulated multidecadal variability in the Northern Hemisphere.
Clim. Dynam., 16, 661-676
Deser, C., J.E. Walsh, and M.S. Timlin, 2000:
Arctic sea ice variability in the context of recent atmospheric circulation trends
J. Climate, 13, 617-633.
Dettinger, M.D., and H.F.Diaz, 2000:
Global characteristics of stream flow seasonality and variability.
J. Hydrometeorol., 1(4), 289-310.
Dickson B, Yashayaev I, Meincke J, et al., 2002:
Rapid freshening of the deep North Atlantic Ocean over the past four decades
NATURE, 416, 832-837.
Dickson, R. R., T.J. Osborn, J.W. Hurrell, et al., 2000:
The Arctic Ocean Response to the North Atlantic Oscillation.
J. Climate, 13, 2671-2696.
Doran, P.T., J.C. Priscu, W.B. Lyons, J.E. Walsh, A.G. Fountain, D.M. McKnight,
D.L. Moorhead, R.A. Virginia, D.H. Wall, G.D. Clow, C.H. Fritsen, C.P. McKay, and A.N. Parsons, 2002: Antarctic climate cooling and
terrestrial ecosystem response.
Nature, 415, 517-520
Eden, C., R.J. Greatbatch and J. Lu, 2002:
Prospects for decadal prediction of the North Atlantic Oscillation (NAO).
Geophys. Res. Lett., 29(10), doi.10.1029/2001GL014069.
Eichelberger, S., and J. R. Holton, 2002:
A Mechanistic Model of the Northern Annular Mode.
J. Geophys. Res., 107, Doi:10.1029/2001JD001092.
Esselborn, S., and C. Eden, 2001: Sea surface height changes in the North Atlantic Ocean related to the North Atlantic Oscillation.
Geophys. Res. Lett., 28, 3473-3476.
Feldstein, S. B., 2002:
The recent trend and variance increase of the annular mode.
J. Climate, 15, 88-94.
Feser, F., H.F. Graf, J. Perlwitz, 2000:
Secular variability of the coupled tropospheric and stratospheric circulation in the GCM ECHAM 3/LSG.
Theor. Appl. Clim., 65, 1-15. Fleming, S.W., R.D. Moore, and G.K.C. Clarke, 2006: Glacier-Mediated Streamflow Teleconnections to the Arctic Oscillation.
Int. J. Climatol., 26, 619-636.
Fraedrich, K., F.W. Gerstengarbe, and P.C. Werner,
Climate shifts during the last century.
Climatic Change, 50, 405-417.
Fyfe, J.C., 2002: Separating extratropical zonal wind variability and mean change.
J. Climate, 16(5), 863-874.
Fyfe, J.C., 2006: Southern Ocean Warming Due to Human Influence.
Geophys. Res. Lett., 33, L19701, doi:10.1029/2006GL027247.
Fyfe, J. C., G. J. Boer, and G. M. Flato, 1999: The Arctic and Antarctic Oscillations and their projected changes under global warming. Geophys. Res. Lett., 26, 1601-1604.
Genthon, C., G. Krinner, and M. Sacchettini, 2003: Interannual Antarctic tropospheric circulation and precipitation variability.
Clim. Dyn., 21, 298-307, doi:10.1007/s00382-003-0329-1. Gille, S.T., 2002: Warming of the Southern Ocean Since the 1950s.
SCIENCE, 295, 1275-1277.
Gillett, N.P., et al, 2002: How linear
is the Arctic Oscillation response to greenhouse gases?
J. Geophys.Res., 107, 4022-4028, 10.1029/2001JD000589
Gillett, N.P., G. C. Hegerl, M.R. Allen,
and P. A. Stott, 2000: Implications of observed changes in the Northern
Hemisphere circulation for the detection of anthropogenic climate change.
Geophys.Res. Lett., 27, 993-996, 2000.
Gillett, N.P., M. P. Baldwin, and
M. R. Allen, 2001: Evidence for nonlinearity in observed stratospheric circulation
changes.
J. Geophys. Res., 106, 7891-7901.
Gillett, N.P., M. R. Allen, and K.D. Williams, 2003:
Modeling the atmospheric response to doubled CO2 and depleted stratospheric ozone using a stratosphere-resolving
coupled GCM.
Q.J.R. Meteorol. Soc., 129(589), 947-966.
Gillett, N.P., M. R. Allen, and K.D. Williams, 2002:
The role of stratospheric resolution in simulating the Arctic Oscillation response to greenhouse gases.
Geophys. Res. Lett. 29, 1500-1503.
Gladyshev, S., S. Martin, R. Riser, et al., 2000:
Dense water production on the northern Okhotsk shelves: Comparison of ship-based spring-summer observations for 1996 and 1997
with satellite observations.
J. Geophys. Res. - Oceans, 105, 26281-26299.
Graf, H. -F., J. Perlwitz, I. Kirchner, and I. Schult, 1995: Recent northern winter climate trends, ozone changes and increased greenhouse forcing. Contr. Atm. Phys., 68, 233-248. Grassi, B., G. Redaelli, and G. Visconti, 2005: Simulation of Polar Antarctic trends: Influence of tropical SST.
Geophys. Res. Lett., 32, L23806, doi:10.1029/2005GL023804.
Grassi, B., G. Redaelli, and G. Visconti, 2006: A physical mechanism of the atmospheric response over Antarctica to decadal trends in tropical SST
Geophys. Res. Lett., 33, L17814, doi:10.1029/2006GL026509.
Greatbatch, R. J., 2000: The North
Atlantic Oscillation (review paper). Stochastic Environmental Research
and Risk Assessment, 14(4-5), 213-242
Hadjinicolaou, P., A. Jrrar, J.A. Pyle, and L. Bishop, 2002: The dynamically driven long-term trend in stratospheric ozone over northern middle latitudes.
Quart. J. Roy. Meteorol. Soc., 128, 1393-1412.
Hall, A., Visbeck, M., 2002:
Synchronous Variability in the Southern Hemisphere Atmosphere, Sea Ice, and Ocean Resulting from the Annular Mode.
J. Clim., 15, 3043-3057.
Hansen, B., W.R. Turrell, and S. Osterhus, 2001:
Decreasing overflow from the Nordic seas into the Atlantic Ocean through the Faroe Bank channel since 1950.
NATURE, 411, 927-930.
Hansen, G., and M. P. Chipperfield, 1999: Ozone depletion at the edge of the Arctic polar vortex 1996/1997. J. Geophys. Res., 104, 1837. Hansen, J., R. Ruedy, J. Glascoe, et al., 1999:
GISS analysis of surface temperature change
J. Geophys. Res., 104, 30997-31022. Electronic version of manuscript available through this link. Hansen J, Ruedy R, M. Sato, M. Imhoff, et al., 2001:
A closer look at the United States and global surface temperature change.
J. Geophys. Res., 106, 23947-23963.
Electronic
version of manuscript available through this link.
Hartmann, D.L., J.M. Wallace, V. Limpasuvan, D.W.J. Thompson, and J.R. Holton , 2000: Can Ozone Depletion and Greenhouse Warming Interact to Produce Rapid Climate Change? Proc. Nat. Acad. Sci., 97, 1412-1417. Hasselmann, K., 1999:
Climate change - Linear and nonlinear signatures
Nature, 398, 755-756. Hegerl, G.C., and J.M. Wallace, 2002:
Influence of Patterns of Climate Variability on the Difference between Satellite and Surface Temperature Trends.
J. Climate, 15, 2412-2428.
Hegerl, G.C., P.D. Jones, and T.P. Barnett, 2001:
Effect of observational sampling error on the detection of anthropogenic climate change.
J. Climate, 14, 198-207.
Higgins, R.W., A. Leetmaa, Y.
Xue, et al., 2000: Dominant Factors Influencing the Seasonal Predictability
of U.S. Precipitation and Surface Air Temperature
J. Climate, 13, 3994-4017.
Hines, K., D. Bromwich, G. Marshall, 2000:
Artificial Surface Pressure Trends in the NCEP-NCAR Reanalysis over the Southern Ocean and Antarctica
J. Climate, 13, 3940-3952.
Hoerling, M.P., J.W. Hurrell, and T. Xu, 2001: Tropical Origins for Recent North Atlantic Climate Change.
Science, 292, 90-92.
Hoerling, M.P. J.W. Hurrell, T. Xu, G.T. Bates, and A. Phillips, 2004: Twentieth Century North Atlantic Climate Change. Part II: Understanding the Effect of Indian Ocean Warming.
Clim. Dyn., 23(3-4), pg371, DOI: 10.1007/s00382-004-0432-y
Holland, M.M., 2003: The North Atlantic Oscillation-ARCTIC Oscillation in the CCSM2 and its Influence on Arctic Climate Variability.
J. Climate, 16, 2767-2781.
Honda, M., K.Yamazaki, H. Nakamura , et al., 1999:
Dynamic and thermodynamic characteristics of atmospheric response to anomalous sea-ice extent in the Sea of
Okhotsk J. Climate, 12, 3347-3358.
Hu, Y., and K. K. Tung, 2002:
Interannual and decadal variations of planetary-wave activity, stratospheric
cooling, and Northern Hemisphere annular mode.
J. Climate, 15, 1659-1673.
Hu, Y., and K. K. Tung, 2003:
Possible Ozone Induced Long-Term Change in Planetary Wave Activity During Late Winter.
J. Climate, 16(18), 3027-3038.
Huang, H.P., K.M. Weickmann and C.J. Hsu, 2001:
Trend in atmospheric angular momentum in a transient climate change simulation with greenhouse gas and aerosol forcing.
J. Climate, 14, 1525-1534.
Hurrell, J. W., 1995: Decadal trends in the
North Atlantic Oscillation region temperatures and precipitation. Science, 269, 676-679.
Hurrell, J. W., 1996: Influence of variations in extratropical wintertime teleconnections on Northern Hemisphere temperature, Geophys. Res. Lett., 23, 665-668. Hurrell, J. W., and H. van Loon, 1997: Decadal variations in climate associated with the North Atlantic Oscillation. Climatic Change, 36, 301-326. Hurrell, J.W., M.P. Hoerling, A. Phillips, and T. Xu, 2004: Twentieth Century North Atlantic Climate Change. Part I: Assessing Determinism.
Clim. Dyn., 23(3-4), pg371.
Jadin, E.A., 2005:
Ozone and Surface Air Temperature Changes.
Russian Meteorology and Hydrology, 10, 64-73.
James, P.M., D. Peters, and D.W Waugh, 2000:
Very low ozone episodes due to polar vortex displacement.
Tellus B, 52, 1123-1137.
Jeong, J.-H., and C.-H. Ho, 2005: Changes in occurrence of cold surges over east Asia in association with Arctic Oscillation.
Geophys. Res. Lett., 32, L14704, doi:10.1029/2005GL023024.
Johannessen, O.M., et al, 2004: Arctic Climate Change: observed and modelled temperature and sea-ice variability.
Tellus A, 56(4), 328-341.
Johnson, M.A., A.Y. Proshutinsky, I.V. Polyakov, 1999:
Atmospheric patterns forcing two regimes of arctic circulation: A return to anticyclonic conditions?
Geophys. Res. Lett., 26, 1621-1624.
Jones, P. D., T.J. Osborn and K.R. Briffa, 2001: The evolution of climate over the last Millenium.
Science, 292, 662-667.
Josey, S.A., E.C. Kent, and B. Sinha, 2001:
Can a state of the art atmospheric general circulation model reproduce recent NAO related variability at the air-sea interface?
Geophys. Res. Lett., 28, 4543-4546.
Jungo, P., and M. Beniston, 2001: Changes in the anomalies of extreme temperature anomalies in the 20th century at Swiss climatological stations located at different latitudes and altitudes.
Theor. Appl. Climatol., 69, 1-12.
Keeley, S.P.E., N.P. Gillett, D.W.J. Thompson, S. Solomon, and P.M. Forster, 2007: Is Antarctic climate most sensitive to ozone depletion in the middle or lower stratosphere?
Geophys. Res. Lett., 34, L22812, doi:10.1029/2007GL031238.
Kelly, P.M., P.D. Jones PD, P.Q. Jia PQ, 1999:
Spatial patterns of variability in the global surface air temperature data set
J. Geophys. Res., 104, 24237-24256. Kerr, R. A., 2002: Whither Arctic Ice? Less of it, For Sure.
Science, 297, 1491.
Kindem, I., and B. Christiansen,
2001: Tropospheric Response to Stratospheric Ozone Loss. Geophysical
Res. Let., 28, 1547-1550.
Kodera, K., and H. Koide, 1997: Spatial and seasonal characteristics of recent decadal trends in the northern hemispheric troposphere and stratosphere, J. Geophys. Res., 102, 19433-19447. Kodera, K., M. Sugi, R. Kawamura, and H. Koide,Characteristic features of recent abrupt changes in atmospheric circulation revealed by a general circulation model, J. Meteorol. Soc. Jpn., 76, 139-144, 1998.
Krichak, P.K., and P. Alpert, 2002: Decadal trends of main Eurasian oscillations and the Eastern Mediterranean precipitation.
Theor. Appl. Climatol., 72, 209-220.
Kryjov, V.N., 2002:
The influence of the winter Arctic Oscillation on the northern Russia spring temperature.
Int. J. Climatol., 7, 779-785
Kuroda, Y., and K. Kodera, 2002:
Effect of solar activity on the polar-night oscillation in the northern and southern hemisphere winter.
J. Meteorol. Soc. Japan, 80, 973-984.
Kushner, P.J., I.M. Held, and T.L. Delworth, 2001:
Southern Hemisphere atmospheric circulation response to global warming. J. Climate,
14, 2238-2249. Kushnir, Y., V. J. Cardon, J. G. Greenwood, and M. A. Cane, 1997: The recent increase in North Atlantic wave heights. J. Climate, 10, 2107-2113. Kwok, R., 2000: Recent changes of the Arctic Ocean
sea ice motion associated with the North Atlantic Oscillation.
Geophys. Res. Lett., 27, 775-778.
Kwok, R., and J.C. Comiso, 2002: Spatial patterns of variability in Antarctic surface temperature:
Connections to the Southern Hemisphere Annular Mode and the Southern Oscillation.
Geophys. Res. Lett., 29, 10.1029/2002GL015415,2002.
Lenton, A., and R. Matear, 2007: Role of the Southern Annular Mode (SAM) in Southern Ocean CO2 Uptake.
Glob. Bio. Cycles, 21(GB2016), doi:10.1029/2006GB002714.
Leroy, S.S., G.R. North, 2000:
The application of COSMIC data to global change research
Terr. Atmos. Ocean Sci., 11, 187-210.
Levitus, S., J.I. Antonov, T.P. Boyer, et al., 2000:
Warming of the world ocean
Science, 287, 2225-2229.
Li, J., R. Yu, T. Zhou, B. Wang, 2005: Why is There an Early Spring Cooling Shift Downstream of the Tibetan Plateau?
J. Climate, 18(22), 4660-4668
Li, S., M.P. Hoerling, S. Peng, and K.M. Weickmann, 2006: The Annular Response to Tropical Pacific SST Forcing.
J. Climate, 19, 1802-1819.
Lin, H., J. Derome, R.J. Greatbatch, K.A. Peterson and J. Lu, 2002:
Tropical links of the Arctic Oscillation. Geophys. Res. Lett., 29(20), 1943, doi:10.1029/2002GL015822. Liu, J., J.A. Curry, and D.G. Martinson, 2004: Interpretation of recent Antarctic sea ice variability.
Geophys. Res. Lett., 31, L02205, doi:10.1029/2003GL018732.
Livingstone, D.M., and M.T. Dokulil,
2001: Eighty years of spatially coherent Austrian lake surface temperatures and their relationship
to regional air temperature and the North Atlantic Oscillation. Limnol.
Oceanogr., 46. 1220-1227.
Lockwood, J.G., 2001: Abrupt and sudden climatic transitions and fluctuations: A review.
Int. J. Climatol, 21, 1153-1179.
Lu, J., and R.J. Greatbatch, 2002:
The changing relationship between the NAO and northern hemisphere climate variability.
Geophys. Res. Lett., 29, 1148-1151.
Luo, D., and T. Gong, 2006: A possible mechanism for the eastward shift of interannual NAO action centers in last three decades.
Geophys. Res. Lett., 33, L24815, doi:10.1029/2006GL027860.
MacDonald, G.M., A.A. Velichko, C.V. Kremenetski,
et al., 2000: Holocene treeline history and climate change across northern
Eurasia. Quaternary Res., 53, 302-311.
Electronic
version of manuscript available through this link.
Mao, J., and A. Robock, 1998: Surface air temperature simulations by AMIP general circulation models: Volcanic and ENSO signals and systematic errors. J. Climate, 11, 1538-1552.
Marshall, G.J., 2002: Trends in Antarctic geopotential height and temperature: A comparison between radiosonde and NCEP-NCAR reanalysis data.
J. Climate, 15, 659-674.
Marshall, G.J., 2003: Trends in the Southern Annular Mode from Observational and Reanalyses.
J. Climate, 16, 4134.
Marshall, G.J., 2006: Short Communication Half-century Seasonal Relationships Between the Southern Annular Mode and Antarctic Temperatures.
Int. J. Climatol., 27, 373-383.
Marshall, G.J., A. Orr, N.P.M. van Lipzig, and J.C. King, 2006: The Impact of a Changing Southern Hemisphere Annular Mode on Antarctic Peninsula Summer Temperatures.
J. Climate, 19(20), 5388.
Marshall, G.J., P.A. Scott, J. Turner, W.M. Connolley, J.C. King, and T.A. Lachlan-Cope, 2004: Causes of exceptional atmospheric circulation changes in the Southern Hemisphere.
Geophys. Res. Letts., 31, doi:10.1029/2004GL019952. Marshall, J., Y. Kushner, D. Battisti, P. Chang, A. Czaja, et al., 2001:
North Atlantic climate variability: Phenomena, impacts and mechanisms.
Int. J. Climatol., 21, 1863-1898.
Martin, P., J.W. Hurrell and T. Xu, 2001:
Tropical origins for Recent North Atlantic Climate Change.
Science., 292, 90-92.
Martinson, D.G., and M.Steele 2001: Future of the Arctic sea ice cover: Implications of an Antarctic analog.
Geophys. Res. Lett., 28, 307-310.
Maslanik, J.A., M.C. Serreze and
R.G. Barry, 1996: Recent decreases in Arctic summer ice cover and linkages
to atmospheric circulation anomalies. Geophys. Res. Lett., 23, 1677-1680.
Maslowski, W., B. Newton, P. Schlosser, et al., 2000:
Modeling recent climate variability in the Arctic Ocean. Geophys. Res. Lett., 27, 3743-3746.
Maugeri, M., Z. Bagnati, M. Brunetti,and T. Nanni, 2001: Trends in Italian total cloud amount, 1951-1996.
Geophys. Res. Lett., 28, 4551-4554.
McCabe, G.J., M.P. Clark and M.C. Sereze,
2001: Trends in Northern Hemisphere surface cyclone frequency and intensity.
J. Climate,
14, 2763-2768.
McPhee, M. G., T. P. Stanton, J.
H. Morison, and D. G. Martinson, 1998: Freshening of the upper ocean in
the Arctic: Is perennial sea ice disappearing? Geophys. Res. Lett.,
25, 1729-1932.
Meehl, G. A., J. W. Hurrell, and H. van Loon, 1998: A modulation of the mechanism of the semiannual oscillation in the Southern Hemisphere. Tellus, 50A, 442-450. Meredith, M.P., P.L. Woodworth, C.W. Hughes, and V. Stepanov, 2004: Changes in the ocean transport through Drake Passage during the 1980s and 1990s, forced by changes in the Southern Annular Mode.
Geophys. Res. Letts., 31(21), L21305, doi:10.1029/2004GL021169.
Miller, A.j., and N. Schneider, 2000:
Interdecadal climate regine dynamics in the North Pacific Ocean: theories, observations and ecosystem impacts.
Paleo. Oceanogr., 47, 355-379.
Miller, R.L., G.A. Schmidt and D.T. Shindell, 2006: Forced Annular Variations in the 20th Century Intergovernmental Panel on Climate Change Fourth Assessment Report Models.
J. Geophys. Res., 111, D18101, doi:10.1029/2005JD026030263.
Min, S.-K., S. Legutke, A. Hense, and W.-T. Kwon, 2005: Internal variability in a 1000-year control simulation with the coupled climate model ECHO-G. Part II: ENSO and NAO.
Tellus, 57(A), 622-640.
Monahan, A.H., J.C. Fyfe, and G.M. Flato,
2000: A regime view of northern hemisphere atmospheric variability and
change under global warming. Geophys. Res. Lett., 27, 1139-1142.
Monahan, A.H., L. Pandolfo, and J.C. Fyfe,
2001: The preferred structure of variability of the Northern Hemisphere
atmospheric circulation. Geophys. Res. Lett., 28, 1019-1022.
Moritz, R.E., C.M. Bitz, and E.J. Steig, 2002:
Dynamics of Recent Climate Change in the Arctic.
Science, 297, 1497-1502.
Mysak, L.A., 2001:
Oceanography - Patterns of Arctic circulation.
Science, 282, 1269-1270.
Mysak, L.A., S.A. Venegas, 1998:
Decadal climate oscillations in the Arctic: A new feedback loop for atmosphere-ice-ocean interactions
Geophys. Res. Lett., 25, 3607-3610.
Neff, W., 1999: Decadal scale trends and variability in the tropospheric circulation over the South Pole.
J. Geophys. Res., 104D(22), 217-227.
New, M., M. Todd, M. Hulme, and P. Jones, 2001:
Precipitation measurements and trends in the twentieth century.
Int. J. Climatol., 21, 1899-+. Newman, P. A., J. F. Gleason, R.
D. McPeters, R. S. Stolarski, 1997: Anomalously low ozone over the Arctic.
Geophys. Res. Lett., 24, 2689-2692.
Nikulin, G.N., and R.P. Repinskaya, 2001:
Modulation of total ozone anomalies in the midlatitude Northern Hemisphere by the Arctic Oscillation.
Izv. Atmos. Ocean. Phy., 37, 633-643.
Noone, D., Y. Yung, and R. Shia, 2003: The Northern Annular Mode response to Arctic sea ice loss and the sensitivity of troposphere-stratosphere interaction.
J. Climate, submitted.
Ogi, M., and J.M. Wallace, 2007: Summer minimum Arctic sea ice extent and the associated summer atmospheric circulation.
Geophys. Res. Lett., 34, L12705, doi:10.1029/2007GL029897.
O'Hanlon, L., 2002: Making waves.
NATURE, 415, 360-362.
Oke, P.R., and H. England, 2004: On the oceanic response to changes in the latitude of the Southern Hemisphere subpolar westerly winds.
J. Climate, 17(5), 1040-1054.
Orsolini, Y.J., and V. Limpasuvan, 2001:
The North Atlantic Oscillation and the occurrences of ozone miniholes.
Geophys. Res. Letters, 28, 4099-4102.
Osborn, T.J., K.R. Briffa, S.F.B. Tett, et al., 1999:
Evaluation of the North Atlantic Oscillation as simulated by a coupled climate model
Clim. Dyn., 15, 685-702.
Ostermeier, G.M., and J.M. Wallace, 2003:
Trends in the North Atlantic Oscillation/Northern Hemisphere Annular Mode during the
Twentieth-Century. J. Climate, 16, 336-341.
Otterman, J., J.K. Angell, J. Ardizzone, R. Atlas, S. Schubert, D. Starr and M.L. Wu, 2002: North-Atlantic surface winds examined as the source of winter warming in Europe.
Geophys. Res. Lett., 29, art. no. 1912.
Overland, J. E., J. M. Adams, and N. A. Bond, 1999: Decadal variability of
the Aleutian low and its relation to high-latitude circulationJ. Climate,
12, 1542-1548. Overland, J. E., and M. Wang, 2005:
The Arctic climate paradox: The recent decrease of the Arctic Oscillation.
Geophys. Res. Lett., 32, L06701, doi:10.1029/2004GL021752.
Overland, J. E., M. Wang and N.A. Bond, 2002: On the
Recent Temperature Changes in the Western Arctic during Spring.J. Climate, 15, 1702-1716.
Paeth, H., A. Hense, R. Glowienka-Hense, S. Voss, and U. Cubasch, 1999:
The North Atlantic Oscillation as an indicator for greenhouse-gas induced regional climate change
Climate Dyn., 15, 953-960.
Park, S., and C.B. Leovy, 2000:
Winter North Atlantic low cloud anomalies associated with the Northern Hemisphere Annular Mode.
Geophys. Res. Lett., 27, 3357-3360.
Perlwitz, J., and H. -F. Graf, 1995: The statistical connection between tropospheric and stratospheric circulation of the Northern Hemisphere in winter. J. Climate, 8, 2281-2295.
Perlwitz, J., H.F. Graf, R. Voss, 2000:
The leading variability mode of the coupled troposphere-stratosphere winter circulation in different climate regimes
J. Geophys. Res., 105, 6915-6926. Perlwitz, J., and H.-F. Graf 2001. Troposphere-stratosphere dynamic
coupling under strong and weak polar vortex conditions. Geophys. Res.
Lett., 28, 271-274.
Perlwitz, J., and H.-F. Graf 2001. The variability of the horizontal
circulation in the troposphere and stratosphere - A comparison.
Theoret. Appl. Climatol., in press.
Peterson, K.A., R.J. Greatbatch, H. Lin, J. Derome and J. Lu, 2002.
Hindcasting the NAO using diabatic forcing of a simple AGCM.
Geophys. Res. Lett., 29, 1336-1340, doi:10.1029/2001GL014502.
Pezza, A.B., and I. Simmonds, 2005: The first South Atlantic hurricane: Unprecedented blocking, low shear and climate change.
Geophys. Res. Lett., 32(15), L15712, doi:10.1029/2005GL023390.
Pfizenmayer, A., H. von Storch, 2001:
Anthropogenic climate change shown by local wave conditions in the North Sea.
Climate Res., 19, 15-23.
Polyakov, I.V., A.Y Proshutinsky, M.A. Johnson,
2000: Seasonal cycles in two regimes of Arctic climate.
J. Geophys. Res., 104, 25761-25788.
Pryor, S.C., and R.J. Barthelmie, 2003: Long term variability of flow over the Baltic.
Int. J. Climatol., 23, 271-289.
Quadrelli, R., M. Lazzeri, C. Cacciamani, et al., 2001:
Observed winter Alpine precipitation variability and links with large-scale circulation patterns.
Climate Res., 17, 275-284.
Ramaswamy, V., M.L. Chanin, J. Angell, et al, 2001:
Stratospheric temperature trends: Observations and model simulations. Rev. Geophys., 39,
71-122.
Randel, W. J., F. Wu, J. M. Russell III and J. Waters, 1999: Space-time patterns of trends in stratospheric constituents derived from UARS measurements. J. Geophys. Res., 104, 3711-3727. Randel, W. J., and F. Wu, 1999: Cooling of the Arctic and Antarctic polar stratospheres due to ozone depletion. J. Climate, 12, 1467-1479. Rebetez, M., 2001: Changes in daily and nightly day-to-day temperature variability during the twentieth century for two stations in Switzerland.
Theor. Appl. Climatol., 69, 13-21.
Renwick, J.A., 2004: Trends in the Southern Hemisphere polar vortex in NCEP and ECMWF reanalyses.
Geophys. Res. Letts., 31, doi:10.1029/2003GL019302. Rigor, I.G., R.L. Colony, S. Martin, 2000:
Variations in surface air temperature observations in the Arctic, 1979-97
J. Climate, 13, 896-914.
Rind, D., J. Perlwitz, and P. Lonergan, 2005: AO/NAO Response to Climate Change. Part I: Respective Influences of Stratospheric and Tropospheric Climate Changes.
J. Geophys. Res., 110, D12107, doi:10.1029/2004JD005103.
Rind, D., J. Perlwitz, P. Lonergan, and J. Lerner, 2005: AO/NAO Response to Climate Change. Part II: Relative Importance of Low and High Latitude Temperature Changes.
J. Geophys. Res, 110, D12108, doi:10.1029/2004JD005686.
Rind, D., M. Chandler, J. Lerner, et al., 2001:
Climate response to basin-specific changes in latitudinal temperature
gradients and implications for sea ice variability.
J. Geophys. Res-Atmos., 106, 20161-20173..
Rind, D., P. Lonergan, N.K. Balachandran, and D. Shindell, 2002: 2 x CO2 and solar variability influences on the troposphere through wave-mean flow interactions.
J. Meteorol. Soc. Jpn., 80, 863-876.
Robertson, A.W., M. Ghil, M. Latif, 2000:
Interdecadal changes in atmospheric low-frequency variability with and without boundary forcing
J. Atm. Sci., 57, 1132-1140.
Robertson, R., M. Visbeck, A.L. Gordon, and E. Fahrbach, 2002: Long-term temperature trends in the deep waters of the Weddell Sea.
Deep-sea Res. Pt. II - Top. St. Oce., 49, 4791-4806.
Robock, A., and J. Mao, 1995: The volcanic signal in surface temperature observations. J. Climate, 8, 1086-1103.
Robock, A., 2000: Volcanic eruptions and climate. Rev. Geophys., 38, 191-219. (Invited paper)
Rodo, X., E. Baert, F. A. Comin, 1997:
Variations in seasonal rainfall in Southern Europe during the present century: relationships with the North Atlantic Oscillation and the El Nino-Southern Oscillation
Climate Dyn., 13, 275-284.
Rogers, J. C., and E. -M. Thompson,
1995: Atlantic Arctic cyclones and the mild Siberian winters of the 1980s.
Geophys. Res. Lett., 22, 799-802.
Russell, G.L., J.R. Miller, D. Rind, et al., 2000:
Comparison of model and observed regional temperature changes during the past 40 years.
J. Geophys. Res., 105, 14891-14898.
Ruzmaikin, A., and J. Feynman
2002: Solar Influence on a Major Mode of Atmospheric Variability.
J. Geophys. Res., 107, 4209-4219, doi:10.1029/2001JD001239.
Saenz, J., C. Rodriguez-Puebla, J. Fernandez, et al., 2001:
Interpretation of interannual winter temperature variations over southwestern Europe.
J. Geophys. Res., 106, 20641-20651.
Santer, B.D., T.M.L. Wigley, C. Doutriaux, J.S. Boyles, et al., 2001:
Accounting for the effects of volcanoes and ENSO in comparisons of modeled and observed temperature trends.
J. Geophys. Res., 106, 28033-28059.
Savelieva, N.I., I.P. Semiletov, L.N. Vasilevskaya, et al., 2000:
A climate shift in seasonal values of meteorological and hydrological parameters for Northeastern Asia.
Prog. Oceanogr., 47, 279-297.
Scaife, A.A., J.R. Knoght, G.K. Vallis, and C.K. Folland, 2005: A stratospheric influence on the winter NAO and North Atlantic surface climate.
Geophys. Res. Lett., 32, L18715, doi:10.1029/2005GL023226.
Schneider, D.P., E.J. Steig, and J.C. Comiso, 2004: Recent climate variability in Antactica from satellite-derived temperature data.
J. Climate, 17(17), 1569-1583.
Schneider, E.K., L. Bengtsson, Z.Z. Hu, 2003: Forcing of Northern Hemisphere climate trends.
J. Atmos. Sci., 60(12), 1504-1521.
Seager, R., Y. Kushnir, M. Visbeck, N. Naik, J, Miller, G. Krahmann, and
H. Cullen, 2000: Causes of Atlantic Ocean climate variability between 1958 and
1998.
Journal of Climate, in press.
Shindell, D. T., R. L. Miller, G. Schmidt, and L. Pandolfo, 1999: Simulation of recent northern winter climate trends by greenhouse-gas forcing.
Nature, 399, 452-455.
Serreze, M.C., J.E. Walsh, F.S. Chapin, et al., 2000:
Observational evidence of recent change in the northern high-latitude environment.
Climatic change, 46, 159-207.
Sexton, D.M.H., 2001: The effect of stratospheric ozone depletion on the phase of the Antarctic Oscillation.
Geophys. Res. Lett., 28, 3697-3700.
Sexton, D.M.H., D.P. Rowell, C.K. Folland, et al, 2001: Detection of anthropogenic
climate change using an atmospheric GCM.
Clim. Dynam., 17, 669-685.
Shindell, D.T., G.A. Schmidt, M.E. Mann, D. Rind, A. Waple, 2001:
Solar forcing of regional climate change during the maunder minimum.
Science, 294, 2149-2152.
Shindell, D.T., G.A. Schmidt, R.L.
Miller, and D. Rind 2001. Northern Hemisphere winter climate response to
greenhouse gas, ozone, solar, and volcanic forcing. J. Geophys. Res.
106, 7193-7210.
Siegismund, F., and C. Schrum, 2001: Decadal changes in the wind forcing over the North Sea.
Climate Res., 18, 39-45.
Slonosky, V.C., P.D. Jones, and T.D. Davies, 2001:
Atmospheric circulation and surface temperature in Europe from the 18th century to 1995.
Int. J. Climatol.
21, 63-75.
Slonosky, V.C., P.D. Jones, and T.D. Davies, 2001:
Variability of the surface atmospheric circulation over Europe, 1774-1995.
Int. J. Climatol., 20, 1875-1897.
Slonosky, V.C., and P. Yiou, 2001: The North Atlantic Oscillation and its
relationship with near surface temperature. Geophys. Res. Lett.
28, 807-810.
Solomon S, 1999: Stratospheric
ozone depletion: A review of concepts and history
Rev. Geophys., 37, 275-316.
Solomon S., R.W. Portmann, T. Sasaki, D.J. Hofman, and D.W.J. Thompson, 2007: Four decades of ozonesone measurements over Antarctica.
J. Geophys. Res. Lett., 110, D21311, doi:10.1029/2005JD005917.
Staehelin, J., J. Mader, A.K. Weiss, and C. Appenzeller, 2002: Long-term ozone trends in Northern mid-latitudes with special emphasis on the contribution of changes in dynamics.
Phys. Chem. Earth, 27, 461-469.
Staehelin, J., N.R.P. Harris, C. Appenzeller, and J. Eberhard, 2001: Ozone trends: A review.
Rev. Geophys. , 39, 231-290.
Steinbrecht, W., H. Claude, and U. Kohler, 1998: Correlations between tropopause height and total ozone: Implication for long-term changes. J. Geophys. Res., 103, 19183-19192. Stendel, M., J.R. Christy, and L. Bengtsson, 2000:
Assessing levels of uncertainty in recent temperature time series.
Clim. Dynam., 16, 587-601.
Stephenson, D.B., V. Pavan, R. Bojariu, 2000:
Is the North Atlantic Oscillation a random walk?
Int. J. Climatol., 20, 1-18.
Stone, D.A., A.J. Weaver, and R.J. Stoufer, 2001:
Projection of climate change onto modes of atmospheric variability.
J. Climate, 14, 3551-3565.
Stone, R.S., E.G. Dutton, J.M. Harris, and D. Longenecker, 2002: Earlier spring snowmelt in northern Alaska as an indicator of climate change.
J. Geophys. Res., 107, art. no. 4089.
Terray, L., C. Cassou, 2000:
Modes of low-frequency climate variability and their relationships with land precipitation and surface temperature:
Application to the Northern Hemisphere winter climate.
Stoch. Env. Res. Risk, 14 (4-5), 339-369.
Thompson, D. W. J, and J. M. Wallace,
1998: The Arctic Oscillation signature in the wintertime geopotential height
and temperature fields. Geophys. Res. Lett., 25, 1297-1300.
Thompson, D. W. J., J. M. Wallace, and G. C. Hegerl, 2000: Annular modes in the extratropical circulation. Part II: Trends. J. Climate, 13, 1018-1036.
Thompson, D. W. J., and J. M. Wallace, 2001:
Regional Climate Impacts of the Northern Hemisphere Annular Mode.
Science, 293, 85-89.
Thompson, D. W. J., and S. Solomon, 2002:
Interpretation of Recent Southern Hemisphere Climate Change.
Science, 296, 895-899.
Thompson, D. W. J., and S. Solomon, 2005:
Recent stratospheric climate trends as evidenced in radiosonde data: Global structure and the tropospheric linkages.
J. Climate, 18, 4785-4795. Thompson, D. W. J., D. J. Lorenz, 2004: The Signature of the Annular Modes in the Tropical Troposphere.
J. Climate, in press.
Todd, M.C., and A.W. Mackay, 2003: Large scale climatic controls on Lake Baikal ice cover.
J. Climate, 16(19), 3186-3199.
Torinesi, O., M. Fily, and C. Genthon, 2003: Interannual variability and trend in the Antarctic ice sheet summer melting period from 20 years of spaceborne microwave data.
J. Clim., 16, 1047-1060. Tourpali, K., C.J.E. Schuurmans, R. van Dorland, B. Steil, C. Bruhl, and E. Manzini, 2005: Solar cycle modulation of the Arctic Oscillation in a chemistry-climate model.
Geophys. Res. Lett., 32, L17803, doi:10.1029/2005GL023509. Tucker, W.B., J.W. Weatherly, D.T. Eppler, et al., 2001:
Evidence for rapid thinning of sea ice in the western Arctic Ocean at the end of the 1980s.
Geophys, Res. Lett., 28, 2851-2854.
Ulbrich, U., and M. Christoph, 1999:
A shift of the NAO and increasing storm track activity over Europe due to anthropogenic greenhouse gas forcing
Climate Dyn., 15, 551-559.
Van den Broeke, M.R., and N.P.M. Van Lipzig, 2004: Changes in Antarctic Temperature, Wind, and Precipitation in Response to the Antarctic Oscillation.
Annals of Glaciology, 39(1), 119-126.
van Lipzig, N.P.M., G.J. Marshall, A. Orr, and J.C. King, 2008: The Relationship Between the Southern Hemisphere Annular Mode and Antarctic Peninsula Summer Temperatures: Analysis of a High-Resolution Model Climatology.
J. Climate, 21, doi:10.1175/2007JCLI1695.1.
Vinje, T., 2001: Anomalies and trends of sea-ice extent and atmospheric circulation in the Nordic Seas during the period 1864-1998.
J. Climate, 14, 255-267.
Vinje, T., 2001: Fram strait ice fluxes and atmospheric
circulation: 1950-2000.J. Climate, 16, 3508-3517.
Volodin, E.M., and N.A. Diansky, 2003: Response of a coupled atmosphere-ocean general circulation model to increased carbon dioxide.
Izv. Atmos. Ocean. Phys., 39(2), 170-186.
Volodin, E.M., and G.V. Ya., 1998: Sensitivity of midlatitude Northern Hemisphere winter circulation to ozone depletion in the lower stratosphere. Russian Meteorology and Hydrology, 8, 23-32. Wallace, J. M., (edited by Eric DeWeaver and Michael
Palmer), 2000: On the Arctic and Antarctic Oscillations. Lecture from the 2000 NCAR Advanced Studies Program Summer Colloquium on Dynamics of Decadal to Centennial Climate Variability.
Wallace, J.M., and D.W.J. Thompson
2002: Annular Modes and Climate Prediction.
Physics Today, 55, 28-33.
Walsh, J. E., W. L. Chapman and T. L. Shy, 1996: Recent decrease of sea level pressure in the central Arctic. J. Climate, 9, 480-486. Walsh, J.E., D.H. Portis, 1999: Variations
of precipitation and evaporation over the North Atlantic Ocean, 1958-1997.
J. Geophys. Res., 104, 16613-16631.
Wang, X.L.L., and V.R. Swail, 2001: Changes of extreme wave heights in Northern Hemisphere oceans and related atmospheric circulation regimes.
J. Climate, 14, 2204-2221.
Watanabe, M., T. Nitta, 1999:
Decadal changes in the atmospheric circulation and associated surface climate variations in the
Northern Hemisphere winter
J. Climate, 12, 494-510.
Waugh, D. W., W. J. Randel, S.
Pawson. P. A. Newman, and E. R. Nash, 1999: Persistence of the lower stratospheric
polar vortices. J. Geophys. Res., 104, 27 191-27 202.
Waugh, D. W., and W. J. Randel, 1999: Climatology of the Arctic and Antarctic polar vortices using elliptical diagnostics. J. Atmos. Sci., 56, 1594-1613. Weber, M., S. Dhomse, F. Wittrock, A. Richter, B.-M. Sinnhuber, and J.P. Burrows, 2003: Dynamical Control of NH and SH Winter/Spring Total Ozone from GOME Observations in 1995-2002.
Geophys. Res. Lett., 30(11), 1583, doi:10.1029/2002GL016799.
Weiss, A.K., J. Staehelin, C. Appenzeller, et al., 2001:
Chemical and dynamical contributions to ozone profile trends of the Payerne (Switzerland) balloon soundings.
J. Geophys. Res., 106, 22685-22694.
Xie, S.P., H. Noguchi, and S. Matsumura,
1999: A hemispheric-scale quasi-decadal oscillation and its signature in
Northern Japan. J. Met. Soc. Japan, 77, 573-582. Xin, X., R. Yu, T. Zhou, and B. Wang, 2006: Drought in Late Apring of South China in Recent Decades.
J. Climate, 19(13), 3197-3206
Yan, Z., P.D. Jones, T.D. Davies, A. Moberg, H. Bergstrom, D. Camuffo, C. Cocheo, M. Maugeri, G.R. Demaree, T. Verhoeve, E. Thoen, M. Barriendos, R. Rodriguez, J. Martin-Vide, and C. Yang, 2002:
Trends of extreme temperatures in Europe and China based on daily observations.
CLIMATIC CHANGE, 53, 355-392. Yi, D.R., L.A. Mysak, S.A. Venegas, 2000:
Decadal-to-interdecadal fluctuations of Arctic sea-ice cover and the atmospheric
circulation during 1954-1994. Atmos. Ocean, 37, 389-415.
Yoo, J.C., and P. D'Odorico, 2002: Trends and fluctuations in the dates of ice break-up of lakes and rivers in Northern Europe: the effect of the North Atlantic Oscillation.
J. Hydrol., 268, 100-112.
Yu, R., and T. Zhou, 2004: Impacts of winter-NAO on March cooling trends over subtropical Eurasia continent in the recent half century.
Geophys. Res. Lett., 31, doi:10.1029/2004GL019814.
Zeeberg, J., and S.L. Forman, 2001:
Changes in glacier extent on north Novaya Zemlya in the twentieth century.
Holocene, 11, 161-175.
Zhang, J., D. Rothrock, and M.
Steele, 2000: Recent Changes in Arctic Sea Ice: The Interplay between Ice
Dynamics and Thermodynamics. J. Climate, 13, 3099-3114.
Zhang, Y.X., and E.C. Hunke, 2001:
Recent Arctic change simulated with a coupled ice-ocean model. J. Geophys. Res.,
106, 4369-4390.
Zhou, S., 1999. In: Proceedings from the American Meteorological Society 79th annual meeting. Dallas, TX. Zhou, X., Geller, M., and M. Zhang,
2001: The cooling trend of the tropical cold point tropopause temperatures
and its implications. J. Geophys. Res., 106(D2), 1511-1522.
Zorita, E., and F. Gonzalez-Rouco, 2000:
Disagreement between predictions of the future behavior of the Arctic Oscillation as global warming.
Geophys. Res. Lett., 27, 1755-1758.
Zwiers, F.W., and A.J. Weaver, 2000:
Climate Change - The causes of 20th century warming.
Science, 290, 2081.
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