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

QIU Yun; LI Li

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QIU Yun, LI Li. Annual variation of geostrophic circulation in the Bay of Bengal observed with TOPEX/Poseidon altimeter data[J]. Haiyang Xuebao, 2007, 29(3): 39-46.

Citation:

QIU Yun, LI Li. Annual variation of geostrophic circulation in the Bay of Bengal observed with TOPEX/Poseidon altimeter data[J]. Haiyang Xuebao, 2007, 29(3): 39-46.

QIU Yun, LI Li. Annual variation of geostrophic circulation in the Bay of Bengal observed with TOPEX/Poseidon altimeter data[J]. Haiyang Xuebao, 2007, 29(3): 39-46.

Citation:

QIU Yun, LI Li. Annual variation of geostrophic circulation in the Bay of Bengal observed with TOPEX/Poseidon altimeter data[J]. Haiyang Xuebao, 2007, 29(3): 39-46.

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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

Received Date: 2006-03-15
Rev Recd Date: 2007-01-18

Abstract

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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References(24)

References

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