Variability of the Subantarctic Mode Water Volume in the South Indian Ocean During 2004-2018

被引：25

作者：

Hong, Yu ^{[1
,2
]}

Du, Yan ^{[1
,2
,3
]}

Qu, Tangdong ^{[4
]}

Zhang, Ying ^{[1
,2
]}

Cai, Wenju ^{[5
,6
,7
]}

机构：

[1] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China

[2] Southern Marine Sci & Engn Guangdong Lab, Guangzhou, Peoples R China

[3] Univ Chinese Acad Sci, Beijing, Peoples R China

[4] Univ Calif Los Angeles, Joint Inst Reg Earth Syst Sci & Engn, Los Angeles, CA USA

[5] CSIRO Oceans & Atmosphere, Ctr Southern Hemisphere Oceans Res CSHOR, Hobart, Tas, Australia

[6] Ocean Univ China, Inst Adv Ocean Studies, Key Lab Phys Oceanog, Qingdao, Peoples R China

[7] Qingdao Natl Lab Marine Sci & Technol, Qingdao, Peoples R China

来源：

GEOPHYSICAL RESEARCH LETTERS | 2020年 / 47卷 / 10期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

subantarctic mode water; South Indian Ocean; INTERMEDIATE WATER; DECADAL CHANGES; CIRCULATION; IMPACT; MASSES; SUBDUCTION; DRIVEN; CO2;

D O I：

10.1029/2020GL087830

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

An analysis of Argo data reveals that the subantarctic mode water (SAMW) in the South Indian Ocean (SIO), characterized by a vertical potential vorticity (PV) minimum, decreases by 10% in volume from 2004 to 2018. Most of this decrease occurs at the 26.8-26.9 kgm(-3) density range which forms southwest of Australia, while a slight volume increase occurs at 26.6-26.8 kg m(-3). Further analysis indicates that the weakening of the Mascarene High and westerly winds in the SIO reduces the evaporation-precipitation, surface heat flux, and Ekman pumping and shoals the mixed layer southwest of Australia, which leads to a volume decrease at 26.8-26.9 kg m(-3) in approximately 3 years. West of 90 degrees E, the parameters exhibit the opposite change, leading to a volume increase at 26.6-26.8 kg m(-3). This result suggests that surface winds play an important role in the variability of the SIO SAMW volume during the Argo period.

引用

页数：9

共 52 条

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