Low-frequency sea level variability in the southern Indian Ocean and its impacts on the oceanic meridional transports

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	Low-frequency sea level variability in the southern Indian Ocean and its impacts on the oceanic meridional transports
	[Zhuang, Wei ; Du, Yan ; Wang, Dongxiao] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China ; [Feng, Ming] CSIRO Marine & Atmospher Res, Floreat, WA, Australia ; [Schiller, Andreas] CSIRO Marine & Atmospher Res, Hobart, Tas, Australia
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
	2013
卷号	118 期号:3 页码:1302-1315
ISSN号	2169-9275
通讯作者	zhuang@scsio.ac.cn
中文摘要	Sea levels in the southern Indian Ocean (SIO) display significant interannual to decadal variability. Off the northwest Australian coast, it has been demonstrated that sea level variability is mostly modulated by remote wind forcing from the tropical Pacific through equatorial and coastal waveguides. In this study, a linear reduced gravity model is used to investigate relative contributions of local wind forcing and remote forcing from the Pacific to the sea level variability of the SIO, with a focus on the western SIO. North of the South Equatorial Current bifurcation latitude (17 degrees S), model simulated sea levels are well correlated with altimeter observations at the dissipation timescale of about 3 years, suggesting that sea level variability on interannual-to-decadal timescales could well be explained by nondispersive baroclinic Rossby wave adjustment. The large sea level variability of the western SIO is primarily caused by westward-propagating Rossby waves driven by wind stress curl in 70 degrees E-95 degrees E, with a minor influence from the remote Pacific forcing. To the south, sea level variability at around 20 degrees S displays lower amplitude due to weaker wind variations at this latitude band, and the modeled sea level variability is weaker than observations. There is a close linkage between the cross-basin sea level difference at 15 degrees S and the interior meridional ocean transport across this latitude on decadal timescales, as assessed with outputs from a data-assimilation model. Thus, the meridional overturning cell of the SIO is influenced by both remote forcing from equatorial Pacific and local winds in the SIO.
学科主题	Oceanography
资助信息	This study benefits from discussions with Profs. Bo Qiu and Shang-Ping Xie. We are also grateful to the two anonymous reviewers whose constructive comments helped improve the manuscript. The ECMWF ORA-S3 data were provided by Magdelena Balmaseda and Jim Potemra via the Asia-Pacific Data Research Center, University of Hawaii. The merged satellite altimeter data were provided by the CLS Space Oceanography Division. W.Z. and Y.D. are supported by National Basic Research Program of China (2010CB950302, 2012CB955603), National Natural Science Foundation of China (41176028, 41176024). M.F. and A.S are supported by CSIRO Wealth from Oceans Flagship.
原文出处	AMER GEOPHYSICAL UNION
语种	英语
WOS记录号	WOS:000320323200018
公开日期	2015-01-14
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/10928]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 GB/T 7714	[Zhuang, Wei,Du, Yan,Wang, Dongxiao] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China,et al. Low-frequency sea level variability in the southern Indian Ocean and its impacts on the oceanic meridional transports[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2013,118(3):1302-1315.
APA	[Zhuang, Wei,Du, Yan,Wang, Dongxiao] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China,[Feng, Ming] CSIRO Marine & Atmospher Res, Floreat, WA, Australia,&[Schiller, Andreas] CSIRO Marine & Atmospher Res, Hobart, Tas, Australia.(2013).Low-frequency sea level variability in the southern Indian Ocean and its impacts on the oceanic meridional transports.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,118(3),1302-1315.
MLA	[Zhuang, Wei,et al."Low-frequency sea level variability in the southern Indian Ocean and its impacts on the oceanic meridional transports".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 118.3(2013):1302-1315.