孟加拉湾上层地转环流周年变化的遥感研究

邱云; 李立

孟加拉湾上层地转环流周年变化的遥感研究

邱云¹,
李立^2,

1.
厦门大学, 海洋系, 福建, 厦门, 361005;国家海洋局, 第三海洋研究所, 福建, 厦门, 361005
2.
国家海洋局, 第三海洋研究所, 福建, 厦门, 361005

基金项目: 国家科技部国际合作重点项目——太平洋-印度洋暖池的Argo观测(2002CB714001);国家自然科学重点基金——太平洋-印度洋暖池动力学和海-气相互作用(40231012);国家海洋局青年基金——孟加拉湾表层环流年际变动特征的卫星遥感研究

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出版历程
- 收稿日期: 2006-03-15
- 修回日期: 2007-01-18

Annual variation of geostrophic circulation in the Bay of Bengal observed with TOPEX/Poseidon altimeter data

QIU Yun¹,
LI Li^2
,

1.
Department of Oceanography, Xiamen University, Xiamen 361005, China;Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
2.
Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China

摘要

摘要: 应用1993～2003年TOPEX/Poseidon卫星测高数据结合历史水文资料,反演了孟加拉湾海面动力地形的平均周年变化,探讨了孟加拉湾上层环流季节特征和演变规律.结果显示,虽然孟加拉湾的大气环流受季风支配年周期波动显著,但表层环流形态的周年演变却呈3个不同的阶段.1～4月间(东北季风后期)湾内受一个海盆尺度的强大反气旋式环流的支配,湾口为西向流;5月西南季风骤起,印度季风漂流越过印度半岛南端出现在湾口,湾内反气旋环流弱化,在其南北两侧各出现一气旋式涡,构成5～9月间南北相间的三涡结构;10月东北季风再起,湾口漂流再次转向,10～12月间湾内则为海盆尺度的弱气旋式环流.受上述环流格局影响,位于西边界的印度沿岸流亦呈相应的3个阶段变化.分析表明,孟加拉湾风应力旋度的变化是造成湾内环流3个阶段演变的主要原因.本地风场和来自赤道海域的外强迫的共同驱动形成了孟加拉湾环流周年演变的独特规律.
- 孟加拉湾 /
- 地转流 /
- 周年变化 /
- 卫星高度计
Abstract: TOPEX/Poseidon satellite altimetry data from 1993 to 2003,combined with histroical hydrographic data,is used to reproduce climatological monthly surface dynamic topography in the Bay of Bengal (BOB).The characters and rules of seasonal evolution of the upper circulation in the BOB are then discussed.Analyses indicate that although dominated by the seasonal reversing Indian monsoon,yet annual variation of the BOB surface circulation could be divided into three stages with distinctive patterns.During Jan through April (the late northeasterly monsoon),the BOB circulation is maily controlled by a basinscale strong anticy clonic gyre with a westward current (Indian monsoon current,IMC) developing in the Bay mouth.From May,responsing on southewestly monsoon abrupt onset,IMC reverses,passing throuth south tip of Indian peninsula,and then intrudes into the bay.In the interior bay,the anticyclonic gyredecays,with two cyclonic gyres prevailing in north and south side of it respectively,forming three-eddy structure during May through September.With northeasterly monsoon onset in October,IMC in the Bay mouth reverses again.The interior Bay is dominated by a basin-scale weak cyclonic circulation during October) December.Affected by annual variation of the BOB circulation,the western boundary current in the BOB also indicates corresponding three-stage variation.It is suggested that three-stagevariation of the BOB circulation is mainly driven by wind stress curlin the interior.Both local wind and equatorial remote wind contribute to annual evolution of the BOB circulation.
- Bay of Bengal /
- geostrophic current /
- annual variation /
- altimeter

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参考文献(24)

International Hydrographic Organization.Limits of Oceans and Seas[M].Special Publication No.23,3rd Edition,1953.38.

MURTY V S N,SARMA Y V B,RAO D P,et al.Water characteristics,mixing and circulation in the Bay of Bengal during southwest monsoon[J].Journal of Marine Research,1992,50:207-228.

SURYANARAYANA A,MURTY V S N,RAO D P.Hydrography and circulation of the Bay of Bengal during early winter,1983[J].Deep-Sea Research Ⅰ,1993,40(1):205-217.

BABU M T,SARMA Y V B,MURTY V S N,et al.On the circulation in the Bay of Bengal during northern spring inter-monsoon (march april 1987)[J].Deep-Sea Research Ⅱ,2003,50:855-865.

POTEMRA J T,LUTHER M E,O'BRIEN J J.The seasonal circulation of the upper ocean in the Bay of Bengal[J].J Geophys Res,1991,96(C7):12 667-12 683.

EIGENHEER A,QUADFASEL D.Seasonal variability of the bay of bengal circulation inferred from TOPEX/Poseidon altmetry[J].J Geophys Res,2000,105(C2):3 243-3 252.

李立,吴日升,郭小钢.南海的季节环流——TOPEX/POSEIDON卫星测高应用研究[J].海洋学报,2000,22(6):13-25

ROBERT W B.Along-track gridded sea surface height anomaly for TOPEX/Poseidon and Jason-1,user's reference manual[Z].Version 2.0,September,2003.

李立,吴日升,李燕初,等.TOPEX/POSEIDON高度计浅海潮汐混淆的初步分析[J].海洋学报,1999,21(3):7-14

CONKRIGHT M E,LOCARNINI R A,GARCIA H E,et al.Ocean Atlas 2001:Objective Analyses,Data Statistics,and Figures,CD -ROM Documentation[Z].National Oceanographic Data Center,Silver Spring,M D,2002.17.

胡建宇.物理海洋学基础教程[M].厦门:厦门大学出版社,1995.32-43.

LAGERLOEF G S E,MITCHUM G T,LUKAS R B,et al.Tropical Pacific near-surface currents estimated from altimeter,wind and drifter data[J].Journal of Geophysical Research,1999,104(C10):23 313-23 326.

邱云,李立.孟加拉湾上层环流研究综述[J].海洋科学进展,2006,24(4):593-603.

WYRTKI K.An equatorial jet in the Indian Ocean[J].Science,1973,181:262-264.

SHETYE S R,GOUVEIA A D,SHENOI S S C,et al.The western boundary current of the seasonal subtropical gyre in the Bay of Bengal[J].J Geophysical Research,1993,98(C1):945-954.

SHETYE S R,GOUVEIA A D,SHANKAR D,et al.Hydrography and circulation in the western Bay of Bengal during the northeast monsoon[J].J Geophysical Research,1996,101(C6):14 011-14 025.

SHANKAR D,McCREARY J P,HAN W,et al.Dynamics of the east India coastal current 1.analytic solution forced by interior Ekman pumping and local alongshore winds[J].J Geophys Res,1996,101 (C6):13 975-13 991.

VINAYACHANDRAN P N,YAMAGATA T.Monsoon response of the sea around Sri Lanka:Generation of thermal domes and anticyclonic vortices[J].Journal of Physical Oceanography,1998,28:1 946-1 960.

XIE S P,XIE Q,WANG D,et al.Summer upwelling in the South China Sea and its role in regional climate variations[J].J Geophys Res,2003,108(C8),3261,doi:10.1029/2003JC00 1867.

McCREARY J P,HAN W,SHANKAR D.Dynamics of the East India Coastal Current 2.Numerical solutions[J].J Geophysical Research,1996,101(C6):13 993-14 010

SHANKAR D,VINAYACHANDRAN P N,UNNIKRISHNAN A S.The monsoon currents in the north Indian Ocean[J].Progress in Oceanography,2002,52:63-120.

VINAYACHANDRAN P N,MASUMOTO Y,MIKAWA T,et al.Intrusion of the southwest monsoon current into the Bay of Bengal[J].J.Geophys.Res.,1999,104(C5):11 077-11 085.

RAO R R,GIRISH Kumar M S,RAVICHANDRAN M,et al.Observed mini-cold pool off the southern tip of Indian and its intrusion into the south central Bay of Bengal during summer monsoon season[J].Geophys Res Let,33,L06607,doi: 10.1029/2005GL025382.

YU L S,O'BRIEN J J,YANG J Y.On the remote forcing of the circulation of the Bay of Bengal[J].J Geophysical Res,1991,96(C11):20 449-20 454.

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