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Subtropical sea surface salinity maxima in the South Indian Ocean
Wang, Yu1; Li, Yuanlong2,3; Wei, Chuanjie3,4,5
Corresponding AuthorWei, Chuanjie(
AbstractSubtropical 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.
Keywordsea surface salinity (SSS) subtropical salinity maximum Aquarius Argo float freshwater flux
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[41776001] ; National Natural Science Foundation of China[41806001] ; National Key R&D Program of China[2016YFC0301103]
WOS Research AreaMarine & Freshwater Biology ; Oceanography
WOS SubjectLimnology ; Oceanography
WOS IDWOS:000511866000002
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Document Type期刊论文
Corresponding AuthorWei, Chuanjie
Affiliation1.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
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
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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