The temporal-spatial features of evaporation and precipitation and the effect on sea surface salinity in the tropical Indian Ocean

Xu Jindian; Gao Lu

doi:10.3969/j.issn.0253-4193.2018.07.008

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Xu Jindian, Gao Lu. The temporal-spatial features of evaporation and precipitation and the effect on sea surface salinity in the tropical Indian Ocean[J]. Haiyang Xuebao, 2018, 40(7): 90-102. doi: 10.3969/j.issn.0253-4193.2018.07.008

Citation:

Xu Jindian, Gao Lu. The temporal-spatial features of evaporation and precipitation and the effect on sea surface salinity in the tropical Indian Ocean[J]. Haiyang Xuebao, 2018, 40(7): 90-102. doi: 10.3969/j.issn.0253-4193.2018.07.008

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The temporal-spatial features of evaporation and precipitation and the effect on sea surface salinity in the tropical Indian Ocean

doi: 10.3969/j.issn.0253-4193.2018.07.008

Xu Jindian,
Gao Lu

Laboratory of Marine Dynamics, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China

Received Date: 2017-08-30
Rev Recd Date: 2017-12-14

Abstract

Abstract

Precipitation and evaporation data were used to investigate the annual distribution characteristics of precipitation, evaporation and net fresh water flux in the tropical Indian Ocean (TIO), then four typical areas were chosen to analyze the seasonal and interannual variation of precipitation, evaporation and net fresh water flux. The results suggest that the maximum annual precipitation appears in the western sea area of Sumatra in eastern Indian Ocean (EIO), which belongs to the rainy weather throughout the year with small seasonal variations; the higher annual precipitation is observed in the northeastern Bay of Bengal (BoB) and northern Andaman Sea, with the interannual variation rising by 4.2 mm per year, and the heavy rainfall falls in the period from May to September. The smaller annual precipitation was found in the western of Arabian Sea. The smaller annual precipitation and higher annual evaporation were found in the eastern sea area in the southern Indian Ocean(20°-30°S,80°-110°E) with the interannual variation increase by 5.1 mm per year before 2000 and decrease by 4.5 mm per year after 2000. The influence of precipitation and evaporation on sea surface salinity (SSS) is discussed by using the Argo salinity. Further analysis indicates that while rainfall is more (less) than evaporation, SSS becomes lower(higher). The inconsistency between the center of higher net freshwater flux (higher evaporation) and lower salinity (higher salinity) is mainly caused by surface horizontal circulation. The SSS seasonal variation has little relation with surface horizontal circulation, while it is highly related to net freshwater flux in the four chosen typical areas. The heavy precipitation has a remarkable influence on surface salinity in BoB. It can cause a decrease in SSS by 0.2-0.8 from 30 m to 50 m.
- precipitation,
- evaporation,
- sea surface salinity,
- the tropical Indian Ocean,
- effect

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