The adjustment mechanism of the surface salinity in the Indian Ocean by oceanic advection

Xu Jindian; Jing Chunsheng; Cai Shangzhan; Lin Xinyu; Gao Lu

doi:10.12284/hyxb2022031

Volume 44 Issue 5

Jun. 2022

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Xu Jindian，Jing Chunsheng，Cai Shangzhan, et al. The adjustment mechanism of the surface salinity in the Indian Ocean by oceanic advection[J]. Haiyang Xuebao，2022, 44(5)：80–91 doi: 10.12284/hyxb2022031

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The adjustment mechanism of the surface salinity in the Indian Ocean by oceanic advection

doi: 10.12284/hyxb2022031

Xu Jindian^{1, 2
,},
Jing Chunsheng^{1, 2
,
,},
Cai Shangzhan^{1, 2},
Lin Xinyu^{1, 2},
Gao Lu³

1.
Ocean Dynamics Laboratory, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
2.
Fujian Provincial Key Laboratory of Marine Physical and Geological Processes, Xiamen 361005, China
3.
Haikou Marine Environment Monitoring Station, State Oceanic Administration, Haikou 570311, China

Received Date: 2021-04-25
Rev Recd Date: 2021-06-22

Available Online: 2022-06-15

Publish Date: 2022-06-15

Abstract

Abstract

In this study, Argo surface salinity, OSCAR current and other data are used to explore the influence of oceanic advection transport on the surface salinity in the Tropical Indian Ocean based on the advection term of the salinity budget equation. The adjustment mechanism of the spatial structure of surface salinity by oceanic advection is revealed by freshwater transport calculation along 6 key sections. The results show that the oceanic advection which transports the high-salinity water in the Equatorial Western Indian Ocean (EWIO) and the Arabian Sea (AS) to the Equatorial Eastern Indian Ocean (EEIO), the Bay of Bengal (BOB) and the Andaman Sea, and also transports the low-salinity water in the EEIO, the BOB and the Andaman Sea to the EWIO, the AS and the Equatorial Southern Indian Ocean, plays a role in adjusting the basic balance of salinity in the Indian Ocean. The analysis of freshwater transport along sections shows that the inconsistency between the center of high precipitation and low salinity in the western sea area of Sumatra, and the inconsistency between the center of high evaporation and high salinity in the western sea area of Australia, are both caused by oceanic advection. In summer, the high-salinity water in the EWIO and the AS transported by the southwest monsoon forced circulation into the BOB, is the main reason for the high surface salinity in the BOB.
- freshwater transport,
- advection,
- adjustment mechanism,
- surface salinity,
- Indian Ocean

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References(19)

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