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Mechanisms of the seasonal variability of mixed-layer salinity in the Indian Ocean
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Jindian Xu1, Yun Qiu1, Chunsheng Jing1, Lu Gao2, Xinyu Lin1
Haiyang Xuebao | 2021, 43(11) : 32 - 45
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Haiyang Xuebao | 2021, 43(11): 32-45
• Article •
Mechanisms of the seasonal variability of mixed-layer salinity in the Indian Ocean
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Jindian Xu1, Yun Qiu1, Chunsheng Jing1, Lu Gao2, Xinyu Lin1
Affiliations
  • 1Laboratory of Marine Dynamics, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
  • 2Haikou Marine Environment Monitoring Station, State Oceanic Administration, Haikou 570311, China
Published: 2021-11-25 doi: 10.12284/hyxb2021162
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In this study, we quantify the mixed-layer salinity (MLS) budget in the Indian Ocean using the salinity budget equation along with Argo salinity, SODA ocean current, evaporation, and precipitation data. The results show that the distribution and seasonal variability for the terms of freshwater flux, advection and entrainment in the Indian Ocean, and their contributions to the variations of MLS. Regarding the climatological annual mean, the negative contribution (15.14%) of the horizontal advection term to MLS is much larger than its positive contribution (9.89%). This implies that the horizontal advection transports low-salinity water to the salty regions, resulting in a decrease in MLS there. The distribution and seasonal variability of the freshwater flux term are generally consistent with those of precipitation, with a positive contribution (13.70%) higher than negative contribution (7.81%). It suggests that the freshwater flux term increases MLS in the Indian Ocean because of the evaporation overwhelming the precipitation. Analysis on the regions with significant seasonal variations of MLS indicates that from June to November, the Southwest Monsoon Current transports low-salinity water from the western equatorial Indian Ocean to the western Arabian Sea, causing salinity in that region to decrease. The advection of high-salinity water from the southern and central to the northern of Bengal Bay is the main reason for the increase in salinity there.

salinity budget  /  mechanism  /  mixed-layer  /  Indian Ocean
Jindian Xu, Yun Qiu, Chunsheng Jing, Lu Gao, Xinyu Lin. Mechanisms of the seasonal variability of mixed-layer salinity in the Indian Ocean[J]. Haiyang Xuebao, 2021 , 43 (11) : 32 -45 . DOI: 10.12284/hyxb2021162
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Article Info
doi: 10.12284/hyxb2021162
  • Receive Date：2020-12-03
  • Online Date：2026-02-26
  • Published：2021-11-25
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  • Received：2020-12-03
  • Revised：2021-01-26
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Affiliations
    1Laboratory of Marine Dynamics, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
    2Haikou Marine Environment Monitoring Station, State Oceanic Administration, Haikou 570311, China
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表12种不同金属材料的力学参数
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Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
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Genus		 种数
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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