Annual and interannual variations of sea-level anomaly in the Bay of Bengal and the Andaman Sea

	Annual and interannual variations of sea-level anomaly in the Bay of Bengal and the Andaman Sea
	Yun, Qiu 1,2; Li, Li 1; Weidong, Yu 3; Jianyu, Hu 2
刊名	ACTA OCEANOLOGICA SINICA
	2007
卷号	26 期号:6 页码:13-29
关键词	Bay of Bengal sea-level anomaly low-frequency variation satellite altimeter
ISSN号	0253-505X
英文摘要	Annual and interannual variations of sea-level anomaly (SLA) in the Bay of Bengal and the Andaman Sea are investigated using altimeter - derived SLA data from 1993 to 2003. It is found that the SLA annual variation in the study area can be divided into three phases with distinctive patterns. During the southwest monsoon ( May - September), positive SLA presents in the equatorial region and extends northward along the eastern boundary of the bay, and the SLA distribution in the interior bay appears to be high in the east and low in the west with two cyclonic cells developing in the north and south of the western bay respectively, between which an anticyclonic cell exists. During the early northeast monsoon ( October - December), the whole bay is dominated by a large cyclonic cell with the pattern of high SLA in the east and low in the west still retained, and the SLA distribution outside the bay is changed in response to the reversal of the Indian Monsoon Current (IMC) in November. During the late northeast monsoon (January - April), a large anticyclonic cell of SLA develops in the bay with negative SLA prevailing in the equatorial region and extending northward along the eastern boundary of bay. Therefore, the SLA distribution in the interior bay reverses to be high in the west and low in the east. It is suggested that the SLA annual variation in the bay is primarily driven by the local wind stress curl, involving Sverdrup balance while the abrupt SLA variation during the peak of northeast monsoon may be partly caused by the semiannual fluctuation of wind in the equatorial region. This fast adjustment in the interior bay is induced by the upwelling coastal Kelvin wave excited by the decay of Wyrtki jet during December through January. Besides the annual variation, in the bay, there are obvious SLA fluctuations with the periods of 2 and 3 - 7 a, which are driven by the interannual variability of large - scale wind field in the equatorial region. The coastal Kelvin wave also provides an important link for the SLA interannual variation between the equatorial region and the interior bay. It is found that the El Nino - Southern Oscillation ( ENSO) - induced influence oil the SLA interannual variation in the interior bay is stronger than the Indian Ocean dipole (IOD) with the associated pattern of low sea-level presenting along the periphery of the bay and high sea-level in the northeast of Sri Lanka.
WOS研究方向	Oceanography
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000252472300002
内容类型	期刊论文
源URL	[http://ir.fio.com.cn/handle/2SI8HI0U/4614]
专题	自然资源部第一海洋研究所
作者单位	1.State Ocean Adm, Inst Oceanog 3, Xiamen 361005, Peoples R China; 2.Xiamen Univ, Coll Oceanog & Environm Sci, State Key Lab Marine Environm Sci, Xiamen 361005, Peoples R China; 3.State Ocean Adm, Inst Oceanog 1, Qinddao 266061, Peoples R China
推荐引用方式 GB/T 7714	Yun, Qiu,Li, Li,Weidong, Yu,et al. Annual and interannual variations of sea-level anomaly in the Bay of Bengal and the Andaman Sea[J]. ACTA OCEANOLOGICA SINICA,2007,26(6):13-29.
APA	Yun, Qiu,Li, Li,Weidong, Yu,&Jianyu, Hu.(2007).Annual and interannual variations of sea-level anomaly in the Bay of Bengal and the Andaman Sea.ACTA OCEANOLOGICA SINICA,26(6),13-29.
MLA	Yun, Qiu,et al."Annual and interannual variations of sea-level anomaly in the Bay of Bengal and the Andaman Sea".ACTA OCEANOLOGICA SINICA 26.6(2007):13-29.