Ekman抽吸对南海海面升高变化的贡献
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摘要
利用NECP海表风场资料和T/P卫星高度计资料,研究风场通过Ekman抽吸对南海海面升高变化的贡献。通过分析发现:对于南海200 m以深区域的平均海面升高的变化,Ekman抽吸在1月和2月份起到主要作用,其他月份和海面升高变化反号。在年际尺度上,Ekman抽吸的EOF第二模态对海面高度的第一模态具有紧密的联系。
Based on the wind data derived from National Center for Environmental Prediction(NCEP) and the Topex/Poseidon(T/P) satellite altimeter data, the influence of Ekman pumping on the variability of sea level in the South China Sea is studied. It is shown that the Ekman pumping plays a major role in mean sea level variability in January and February deeper than 200 m water depth. However, in other seasons the influence is opposite. In the interannual scale, the second EOF mode of Ekman pumping has close links with the first mode of the variability of sea level.
Based on the wind data derived from National Center for Environmental Prediction(NCEP) and the Topex/Poseidon(T/P) satellite altimeter data, the influence of Ekman pumping on the variability of sea level in the South China Sea is studied. It is shown that the Ekman pumping plays a major role in mean sea level variability in January and February deeper than 200 m water depth. However, in other seasons the influence is opposite. In the interannual scale, the second EOF mode of Ekman pumping has close links with the first mode of the variability of sea level.
引文
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[3]Wyrtki K.Physical oceanography of the southeast Asia waters.Scientific results of marine investigations of the South China Sea and the Gulf of Thailand[R].NAGA Report2,1961:195.
[4]Gregory J M,Church J A,Boer G J,et al.Comparison of results from several AOGCMs for global and regional sea-level change1900-2100[J].Climate Dynamics,2001,18(3-4):225-240.
[5]Munk W.Twentieth century sea level:an enigma[J].Proceedings of the National Academy of Sciences of the United States of America,2002,99(10):6550-6555.
[6]Carton J A,Giese B S,Grodsky S A.Sea level rise and the warming of the oceans in the Simple Ocean Data Assimilation(SODA)ocean reanalysis[J].Journal of Geophysical Research,2005,110:C09006.
[7]Shaw P T,Chao S Y,Fu L L.Sea surface height variations in the South China Sea from satellite altimetry[J].Oceanologica Acta,1999,22(1):1-17.
[8]Ho C R,Zheng Q N,Soong YS,et al.Seasonal variability of sea surface height in the South China Sea observed with TOPEX/Poseidon altimeter data[J].Journal of Geophysical Research,2000,105(C6):13981-13990.
[9]Li L,Xu J D,Cai R S.Trends of sea level rise in the South China Sea during the 1990s:an altimetry result[J].Chinese Science Bulletin,2002,47(7):582-585.
[10]Cheng X H,Qi Y Q.Trends of sea level variations in the South China Sea from merged altimetry data[J].Global and Planetary Change,2007,57(3-4):371-382.
[11]Fang W D,Guo JJ,Shi P,et al.Low frequency variability of South China Sea surface circulation from 11 years of satellite altimeter data[J].Geophysical Research Letters,2006,33(22):L33612.
[12]王东晓,谢强,杜岩,等.1997-1998年南海暖事件[J].科学通报,2002,47(9):711-716.
[13]Xie S P,Xie Q,Wang D X,et al.Summer upwelling in the South China Sea and its role in regional climate variations[J].Journal of Geophysical Research,2003,108(C8):3261.
[14]Wang Y G,Fang G H,Wei Z X,et al.Interannual variation of the South China Sea circulation and its relation to El Ni?o,as seen from a variable grid global ocean model[J].Journal of Geophysical Research,2006,111(C11):C11S14.
[15]Swapna P,Gan J P,Lau A,et al.On the warm/cold regime shift in the South China Sea:Observation and modeling study[J].Deep-Sea Research Part I:Oceanographic Research Papers,2009,56(7):1039-1056.
[16]Rong Z R,Liu Y G,Zong H B,et al.Interannual sea level variability in the South China Sea and its response to ENSO[J].Global and Planetary Change,2007,55(4):257-272.
[17]Wang Q,Wang YX,Bo H,et al.Different roles of Ekman pumping in the west and east segments of the South China Sea Warm Current[J].Acta Oceanologica Sinica,2011,30(3):1-13.
[18]郭俊健,方文东,方国洪,等.基于11年高度计资料的南海表层环流时空变化[J].科学通报,2006,51(S2):1-8.
[19]Liu Z Y,Yang H J,Liu Q Y.Regional dynamics of seasonal variability in the South China Sea[J].Journal of Physical Oceanography,2000,31(1):272-284.
[20]North G R,Bell T L,Cahalan R F,et al.Sampling errors in the estimation of empirical orthogonal functions[J].Monthly Weather Review,1982,110(7):699-706.