Long-Wave Dynamics of Sea Level Variations during Indian Ocean Dipole Events

doi:10.1175/2008JPO3900.1

IOCAS-IR > 海洋环流与波动重点实验室

	Long-Wave Dynamics of Sea Level Variations during Indian Ocean Dipole Events
	Yuan, Dongliang1 ; Liu, Hailong 2; Yuan, DL, Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, 7 Nanhai Rd, Qingdao 266071, Peoples R China
	2009-05-01
发表期刊	JOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN	0022-3670
卷号	39 期号:5 页码:1115-1132
文章类型	Article
摘要	Long-wave dynamics of the interannual variations of the equatorial Indian Ocean circulation are studied using an ocean general circulation model forced by the assimilated surface winds and heat flux of the European Centre for Medium-Range Weather Forecasts. The simulation has reproduced the sea level anomalies of the Ocean Topography Experiment (TOPEX)/Poseidon altimeter observations well. The equatorial Kelvin and Rossby waves decomposed from the model simulation show that western boundary reflections provide important negative feedbacks to the evolution of the upwelling currents off the Java coast during Indian Ocean dipole (IOD) events. Two downwelling Kelvin wave pulses are generated at the western boundary during IOD events: the first is reflected from the equatorial Rossby waves and the second from the off-equatorial Rossby waves in the southern Indian Ocean. The upwelling in the eastern basin during the 1997-98 IOD event is weakened by the first Kelvin wave pulse and terminated by the second. In comparison, the upwelling during the 1994 IOD event is terminated by the first Kelvin wave pulse because the southeasterly winds off the Java coast are weak at the end of 1994.; Long-wave dynamics of the interannual variations of the equatorial Indian Ocean circulation are studied using an ocean general circulation model forced by the assimilated surface winds and heat flux of the European Centre for Medium-Range Weather Forecasts. The simulation has reproduced the sea level anomalies of the Ocean Topography Experiment (TOPEX)/Poseidon altimeter observations well. The equatorial Kelvin and Rossby waves decomposed from the model simulation show that western boundary reflections provide important negative feedbacks to the evolution of the upwelling currents off the Java coast during Indian Ocean dipole (IOD) events. Two downwelling Kelvin wave pulses are generated at the western boundary during IOD events: the first is reflected from the equatorial Rossby waves and the second from the off-equatorial Rossby waves in the southern Indian Ocean. The upwelling in the eastern basin during the 1997-98 IOD event is weakened by the first Kelvin wave pulse and terminated by the second. In comparison, the upwelling during the 1994 IOD event is terminated by the first Kelvin wave pulse because the southeasterly winds off the Java coast are weak at the end of 1994. The atmospheric intraseasonal forcing, which plays an important role in inducing Java upwelling during the early stage of an IOD event, is found to play a minor role in terminating the upwelling off the Java coast because the intraseasonal winds are either weak or absent during the IOD mature phase. The equatorial wave analyses suggest that the upwelling off the Java coast during IOD events is terminated primarily by western boundary reflections.
关键词	Equatorial Waves Climate Variability Rossby Waves Circulation Reflection Rectification Impact Cycle Model
学科领域	Oceanography
DOI	10.1175/2008JPO3900.1
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000266382600003
引用统计	被引频次：57[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/1777
专题	海洋环流与波动重点实验室
通讯作者	Yuan, DL, Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, 7 Nanhai Rd, Qingdao 266071, Peoples R China
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Inst Atmospher Phys, LASG, Beijing, Peoples R China
第一作者单位	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Yuan, Dongliang,Liu, Hailong,Yuan, DL, Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, 7 Nanhai Rd, Qingdao 266071, Peoples R China. Long-Wave Dynamics of Sea Level Variations during Indian Ocean Dipole Events[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2009,39(5):1115-1132.
APA	Yuan, Dongliang,Liu, Hailong,&Yuan, DL, Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, 7 Nanhai Rd, Qingdao 266071, Peoples R China.(2009).Long-Wave Dynamics of Sea Level Variations during Indian Ocean Dipole Events.JOURNAL OF PHYSICAL OCEANOGRAPHY,39(5),1115-1132.
MLA	Yuan, Dongliang,et al."Long-Wave Dynamics of Sea Level Variations during Indian Ocean Dipole Events".JOURNAL OF PHYSICAL OCEANOGRAPHY 39.5(2009):1115-1132.

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