Interannual to Decadal Variability of Upper-Ocean Salinity in the Southern Indian Ocean and the Role of the Indonesian Throughflow

doi:10.1175/JCLI-D-19-0056.1

IOCAS-IR > 海洋环流与波动重点实验室

	Interannual to Decadal Variability of Upper-Ocean Salinity in the Southern Indian Ocean and the Role of the Indonesian Throughflow
	Hu, Shijian 1,2,3,4; Zhang, Ying 5,6,7; Feng, Ming 7,8; Du, Yan 5,6; Sprintall, Janet 9; Wang, Fan1,3 ; Hu, Dunxin 1,3; Xie, Qiang 5,10; Chai, Fei 2
	2019-10-01
Source Publication	JOURNAL OF CLIMATE
ISSN	0894-8755
Volume	32 Issue:19 Pages:6403-6421
Corresponding Author	Feng, Ming(ming.feng@csiro.au)
Abstract	Variability of oceanic salinity, an indicator of the global hydrological cycle, plays an important role in the basin-scale ocean circulation. In this study, interannual to decadal variability of salinity in the upper layer of the Indian Ocean is investigated using Argo observations since 2004 and data assimilating model outputs (1992-2015). The southeastern Indian Ocean shows the strongest interannual to decadal variability of upper-ocean salinity in the Indian Ocean. Westward propagation of salinity anomalies along isopycnal surfaces is detected in the southern Indian Ocean and attributed to zonal salinity advection anomalies associated with the Indonesian Throughflow and the South Equatorial Current. Composite and salinity budget analyses show that horizontal advection is a major contributor to the interannual to decadal salinity variability of the southern Indian Ocean, and the local air-sea freshwater flux plays a secondary role. The Pacific decadal oscillation (PDO) and El Nino-Southern Oscillation (ENSO) modulate the salinity variability in the southeastern Indian Ocean, with low salinity anomalies occurring during the negative phases of the PDO and ENSO and high salinity anomalies during their positive phases. The Indonesian Throughflow plays an essential role in transmitting the PDO- and ENSO-related salinity signals into the Indian Ocean. A statistical model is proposed based on the PDO index, which successfully predicts the southeastern Indian Ocean salinity variability with a lead time of 10 months.
Keyword	Indian Ocean Advection Atmosphere-ocean interaction ENSO Ocean circulation Thermocline
DOI	10.1175/JCLI-D-19-0056.1
Indexed By	SCI
Language	英语
Funding Project	Key Research Program of Frontier Sciences, CAS[QYZDB-SSWSYS023] ; National Natural Science Foundation of China[91858101] ; National Natural Science Foundation of China[41776018] ; National Natural Science Foundation of China[41730534] ; National Natural Science Foundation of China[41525019] ; China Scholarship Council ; NOAA's Climate Program Office, Climate Variability and Predictability Program[NA17OAR4310257] ; CSHOR ; Key Research Program of Frontier Sciences, CAS[QYZDB-SSWSYS023] ; National Natural Science Foundation of China[91858101] ; National Natural Science Foundation of China[41776018] ; National Natural Science Foundation of China[41730534] ; National Natural Science Foundation of China[41525019] ; China Scholarship Council ; NOAA's Climate Program Office, Climate Variability and Predictability Program[NA17OAR4310257] ; CSHOR
WOS Research Area	Meteorology & Atmospheric Sciences
WOS Subject	Meteorology & Atmospheric Sciences
WOS ID	WOS:000484615400001
Publisher	AMER METEOROLOGICAL SOC
Citation statistics	Cited Times:6[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.qdio.ac.cn/handle/337002/162697
Collection	海洋环流与波动重点实验室
Corresponding Author	Feng, Ming
Affiliation	1.Chinese Acad Sci, Ctr Ocean Mega Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Shandong, Peoples R China 2.State Ocean Adm, Inst Oceanog 2, State Key Lab Satellite Ocean Environm Dynam, Hangzhou, Zhejiang, Peoples R China 3.Pilot Natl Lab Marine Sci & Technol Qingdao, Qingdao, Shandong, Peoples R China 4.Univ Chinese Acad Sci, Coll Marine Sci, Qingdao, Shandong, Peoples R China 5.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China 6.Univ Chinese Acad Sci, Beijing, Peoples R China 7.CSIRO Oceans & Atmosphere, Crawley, WA, Australia 8.CSIRO Oceans & Atmosphere, Ctr Southern Hemisphere Oceans Res, Hobart, Tas, Australia 9.Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA 10.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China
First Author Affilication	Institute of Oceanology, Chinese Academy of Sciences
Recommended Citation GB/T 7714	Hu, Shijian,Zhang, Ying,Feng, Ming,et al. Interannual to Decadal Variability of Upper-Ocean Salinity in the Southern Indian Ocean and the Role of the Indonesian Throughflow[J]. JOURNAL OF CLIMATE,2019,32(19):6403-6421.
APA	Hu, Shijian.,Zhang, Ying.,Feng, Ming.,Du, Yan.,Sprintall, Janet.,...&Chai, Fei.(2019).Interannual to Decadal Variability of Upper-Ocean Salinity in the Southern Indian Ocean and the Role of the Indonesian Throughflow.JOURNAL OF CLIMATE,32(19),6403-6421.
MLA	Hu, Shijian,et al."Interannual to Decadal Variability of Upper-Ocean Salinity in the Southern Indian Ocean and the Role of the Indonesian Throughflow".JOURNAL OF CLIMATE 32.19(2019):6403-6421.

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