Seasonal and interannual variations of mixed layer salinity in the southeast tropical Indian Ocean

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)

	Seasonal and interannual variations of mixed layer salinity in the southeast tropical Indian Ocean
	Zhang, Ningning; Feng, Ming; Du, Yan; Lan, Jian; Wijffels, Susan E.
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
	2016
卷号	121 期号:7 页码:4716-4731
关键词	Indonesian Throughflow Leeuwin Current ENSO Indian Ocean Dipole salinity budget air-sea flux
通讯作者	Feng, M (reprint author), CSIRO Oceans & Atmosphere, Perth, WA, Australia. ; Feng, M (reprint author), Western Australian Marine Sci Inst, Perth, WA, Australia.
中文摘要	In this study, seasonal and interannual variations of the mixed layer salinity (MLS) in the southeast tropical Indian Ocean (SETIO) are analyzed using satellite observations, historical data sets, and data-assimilating ocean model outputs. On the seasonal cycle, the MLS in the SETIO becomes fresher in austral winter and saltier in austral summer: between the Java-Lesser Sunda coast and the South Equatorial Current (SEC, 12 degrees S), where positive entrainment and fresh advections counterbalance each other, the annual cycle of the MLS closely follows the variation of the air-sea freshwater forcing; off the northwest and west Australian coasts, the MLS variations are influenced by the annual cycles of the Indonesian Throughflow (ITF) and Leeuwin Current (LC) transports as well as the air-sea freshwater forcing, with eddy fluxes acting to freshen the MLS along the SEC, the Eastern Gyral Current, and the LC. On the interannual-scale, El Nino (La Nina) events are typically associated with saltier (fresher) MLS in the SETIO. Composite and budget analyses reveal that interannual variations in precipitations drive the MLS anomalies off the Java-Lesser Sunda coast; between 12 degrees S and the northwest Australian coast, the MLS variations are influenced by both advection anomalies and local precipitation anomalies; whereas anomalous meridional currents contribute to the MLS variations off the west Australian coast. Both enhanced local precipitations and the ITF transport anomalies have substantial contributions to the drastic freshening of the Indonesian-Australian Basin between the Java-Lesser Sunda coast and the northwest Australian coast during the extended La Nina events in 1999-2001 and 2010-2012.
学科主题	Oceanography
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/15350]
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	Zhang, Ningning,Feng, Ming,Du, Yan,et al. Seasonal and interannual variations of mixed layer salinity in the southeast tropical Indian Ocean[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2016,121(7):4716-4731.
APA	Zhang, Ningning,Feng, Ming,Du, Yan,Lan, Jian,&Wijffels, Susan E..(2016).Seasonal and interannual variations of mixed layer salinity in the southeast tropical Indian Ocean.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,121(7),4716-4731.
MLA	Zhang, Ningning,et al."Seasonal and interannual variations of mixed layer salinity in the southeast tropical Indian Ocean".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 121.7(2016):4716-4731.