Interannual variability of sea surface chlorophyll a in the southern tropical Indian Ocean: Local versus remote forcing

doi:10.1016/j.dsr.2022.103914

IOCAS-IR > 海洋环流与波动重点实验室

	Interannual variability of sea surface chlorophyll a in the southern tropical Indian Ocean: Local versus remote forcing
	Ma, Xueying1 ; Chen, Gengxin 1,4; Li, Yuanlong 2,3; Zeng, Lili 1
	2022-12-01
发表期刊	DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
ISSN	0967-0637
卷号	190 页码:13
通讯作者	Chen, Gengxin([email protected])
摘要	Phytoplankton are crucial to marine ecosystems and the global carbon cycle. This study investigates the char-acteristics and causes of the interannual variation of the surface chlorophyll a (chl a) in the southern tropical Indian Ocean (STIO). We find that in addition to the Seychelles-Chagos thermocline ridge (SCTR) upwelling zone in the southwestern basin, large interannual variability also shows up in the southeastern tropical Indian Ocean (SETIO; 6 degrees-18 degrees S, 70 degrees-92 degrees E). The chl a in the SCTR shows two dominant periods of four years and two years, whereas it shows a dominant period of six years and a weaker period of three years in the SETIO. Surface wind forcing anomalies within the STIO, but not the Indonesian throughflow, cause the interannual chl a anomaly. In the SETIO region, the thermocline dynamics control the chl a variation via a combination of equal contributions from local Ekman pumping and remote Rossby waves generated by the wind stress curl from the east. In the SCTR region, the thermocline dynamics explain only about 67% of the chl a variation, with a larger contribution from the remotely generated Rossby waves than local Ekman pumping. The circulation in the western basin also contributes to the chl a variation by transporting western equatorial chl a to this region during the boreal summer-fall. Both the Indian Ocean Dipole and the El Nino-Southern Oscillation act to modulate the chl a variation in the STIO. They make comparable contributions in the SETIO, while the Indian Ocean Dipole plays a more important role in the SCTR.
关键词	Surface chlorophyll a Interannual variability Thermocline dynamics Southern tropical indian ocean Ekman pumping Rossby waves
DOI	10.1016/j.dsr.2022.103914
收录类别	SCI
语种	英语
资助项目	Strategic Priority Research Program of Chinese Academy of Sciences[XDA 20060502]; Strategic Priority Research Program of Chinese Academy of Sciences[XDB42000000]; National Natural Science Foundation of China[41976016]; National Natural Science Foundation of China[42076021]; Youth Innovation Promotion Association CAS[Y2021093]; Guangdong Basic and Applied Basic Research Foundation[2021A1515011534]; State Key Laboratory of Tropical Oceanography[LTOZZ2002]
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000883771400003
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：5[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/337002/180305
专题	海洋环流与波动重点实验室
通讯作者	Chen, Gengxin
作者单位	1.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 4.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Ma, Xueying,Chen, Gengxin,Li, Yuanlong,et al. Interannual variability of sea surface chlorophyll a in the southern tropical Indian Ocean: Local versus remote forcing[J]. DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,2022,190:13.
APA	Ma, Xueying,Chen, Gengxin,Li, Yuanlong,&Zeng, Lili.(2022).Interannual variability of sea surface chlorophyll a in the southern tropical Indian Ocean: Local versus remote forcing.DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,190,13.
MLA	Ma, Xueying,et al."Interannual variability of sea surface chlorophyll a in the southern tropical Indian Ocean: Local versus remote forcing".DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS 190(2022):13.

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