Subtropical sea surface salinity maxima in the South Indian Ocean

doi:10.1007/s00343-019-8251-5

IOCAS-IR > 海洋环流与波动重点实验室

	Subtropical sea surface salinity maxima in the South Indian Ocean
	Wang, Yu 1; Li, Yuanlong 2,3; Wei, Chuanjie 3,4,5
	2020
发表期刊	JOURNAL OF OCEANOLOGY AND LIMNOLOGY
ISSN	2096-5508
卷号	38 期号:1 页码:16-29
通讯作者	Wei, Chuanjie(weichuanjie_iocas@126.com)
摘要	Subtropical sea surface salinity (SSS) maximum is formed in the subtropical South Indian Ocean (SIO) by excessive evaporation over precipitation and serves as the primary salt source of the SIO. Space-borne SSS measurements by Aquarius satellite during September 2011-May 2015 detect three disconnected SSS maximum regions (>35.6) in the eastern (105 degrees E-115 degrees E, 38 degrees S-28 degrees S), central (60 degrees E-100 degrees E, 35 degrees S-25 degrees S), and western (25 degrees E-10 degrees E, 38 degrees S-20 degrees S) parts of the subtropical SIO, respectively. Such structure is however not seen in gridded Argo data. Analysis of Argo profile data confirms the existence of the eastern maximum patch and also reveals SSS overestimations of Aquarius near the western and eastern boundaries. Although subjected to large uncertainties, a mixed-layer budget analysis is employed to explain the seasonal cycle of SSS. The eastern and central regions reach the highest salinity in February-March and lowest salinity in August-September, which can be well explained by surface freshwater forcing (SFF) term. SFF is however not controlled by evaporation (E) or precipitation (P). Instead, the large seasonal undulations of mixed layer depth (MLD) is the key factor. The shallow (deep) MLD in austral summer (winter) amplifies (attenuates) the forcing effect of local positive E-P and causes SSS rising (decreasing). Ocean dynamics also play a role. Particularly, activity of mesoscale eddies is a critical factor regulating SSS variability in the eastern and western regions.
关键词	sea surface salinity (SSS) subtropical salinity maximum Aquarius Argo float freshwater flux
DOI	10.1007/s00343-019-8251-5
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[41776001] ; National Natural Science Foundation of China[41806001] ; National Key R&D Program of China[2016YFC0301103]
WOS研究方向	Marine & Freshwater Biology ; Oceanography
WOS类目	Limnology ; Oceanography
WOS记录号	WOS:000511866000002
出版者	SCIENCE PRESS
引用统计	被引频次：10[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/337002/165380
专题	海洋环流与波动重点实验室
通讯作者	Wei, Chuanjie
作者单位	1.Minist Nat Resources, North China Sea Offshore Engn Survey Inst, North China Sea Branch, Qingdao 266061, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Engn & Technol Dept, Qingdao 266071, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Wang, Yu,Li, Yuanlong,Wei, Chuanjie. Subtropical sea surface salinity maxima in the South Indian Ocean[J]. JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2020,38(1):16-29.
APA	Wang, Yu,Li, Yuanlong,&Wei, Chuanjie.(2020).Subtropical sea surface salinity maxima in the South Indian Ocean.JOURNAL OF OCEANOLOGY AND LIMNOLOGY,38(1),16-29.
MLA	Wang, Yu,et al."Subtropical sea surface salinity maxima in the South Indian Ocean".JOURNAL OF OCEANOLOGY AND LIMNOLOGY 38.1(2020):16-29.

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