Multidecadal Sea Level Rise in the Southeast Indian Ocean: The Role of Ocean Salinity Change

doi:10.1175/JCLI-D-21-0288.1

IOCAS-IR > 海洋环流与波动重点实验室

	Multidecadal Sea Level Rise in the Southeast Indian Ocean: The Role of Ocean Salinity Change
	Lu, Ying1,2 ; Li, Yuanlong 1,3,4; Duan, Jing 1,3; Lin, Pengfei 5; Wang, Fan1,2,3
	2022-03-01
发表期刊	JOURNAL OF CLIMATE
ISSN	0894-8755
卷号	35 期号:5 页码:1479-1496
通讯作者	Li, Yuanlong(liyuanlong@qdio.ac.cn)
摘要	Regional sea level rise in the southeast Indian Ocean (SEIO) exerts growing threats to the surrounding Australian and Indonesian coasts, but the mechanisms of sea level rise have not been firmly established. By analyzing observational datasets and model results, this study investigates multidecadal steric sea level (SSL) rise of the SEIO since the mid-twentieth century, underscoring a significant role of ocean salinity change. The average SSL rising rate from 1960 through 2018 was 7.4 +/- 2.4 mm decade(-1), and contributions of the halosteric and thermosteric components were similar to 42% and similar to 58%, respectively. The notable salinity effect arises primarily from a persistent subsurface freshening trend at 400-1000 m. Further insights are gained through the decomposition of temperature and salinity changes into the heaving (vertical displacements of isopycnal surfaces) and spicing (density-compensated temperature and salinity change) modes. The subsurface freshening trend since 1960 is mainly attributed to the spicing mode, reflecting property modifications of the Subantarctic Mode Water (SAMW) and Antarctic Intermediate Water (AAIW) in the southern Indian Ocean. Also noteworthy is a dramatic acceleration of SSL rise (20.3 +/- 7.0 mm decade(-1)) since similar to 1990, which was predominantly induced by the thermosteric component (16.3 +/- 5.5 mm decade(-1)) associated with the heaving mode. Enhanced Ekman downwelling by surface winds and radiation forcing linked to global greenhouse gas warming mutually caused the depression of isopycnal surfaces, leading to the accelerated SSL rise through thermosteric effect. This study highlights the complexity of regional sea level rise in a rapidly changing climate, in which the role of ocean salinity is vital and time-varying.
关键词	Indian Ocean Sea level Salinity Multidecadal variability
DOI	10.1175/JCLI-D-21-0288.1
收录类别	SCI
语种	英语
资助项目	Strategic Priority Research Program of Chinese Academy of Sciences[XDB40000000] ; National Natural Science Foundation of China (NSFC)[41806001] ; National Natural Science Foundation of China (NSFC)[41976026] ; Shandong Provincial Natural Science Foundation[ZR2020JQ17] ; National Key R&D Program of China[2019YFA0606702] ; Key Deployment Project of CAS Centre for Ocean MegaScience[COMS2019Q07]
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000799197000006
出版者	AMER METEOROLOGICAL SOC
引用统计	被引频次：12[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/179330
专题	海洋环流与波动重点实验室
通讯作者	Li, Yuanlong
作者单位	1.Chinese Acad Sci, Inst Oceanol & Ctr Ocean Megasci, Key Lab Ocean Circulat & Waves, CAS, Qingdao, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Ocean Dynam & Climate, Qingdao, Peoples R China 4.Chinese Acad Sci, Ctr Excellence Quaternary Sci & Global Change, Xian, Peoples R China 5.Chinese Acad Sci, Inst Atmospher Phys, LASG, Beijing, Peoples R China
第一作者单位	中国科学院海洋大科学研究中心
通讯作者单位	中国科学院海洋大科学研究中心
推荐引用方式 GB/T 7714	Lu, Ying,Li, Yuanlong,Duan, Jing,et al. Multidecadal Sea Level Rise in the Southeast Indian Ocean: The Role of Ocean Salinity Change[J]. JOURNAL OF CLIMATE,2022,35(5):1479-1496.
APA	Lu, Ying,Li, Yuanlong,Duan, Jing,Lin, Pengfei,&Wang, Fan.(2022).Multidecadal Sea Level Rise in the Southeast Indian Ocean: The Role of Ocean Salinity Change.JOURNAL OF CLIMATE,35(5),1479-1496.
MLA	Lu, Ying,et al."Multidecadal Sea Level Rise in the Southeast Indian Ocean: The Role of Ocean Salinity Change".JOURNAL OF CLIMATE 35.5(2022):1479-1496.

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