气候变化领域集成服务门户(CCPortal): Lagged effect of Southern Annular Mode on chlorophyll-a in the mid-latitude South Pacific and Indian Oceans

CCPortal

DOI	10.1088/1748-9326/ad2eed
	Lagged effect of Southern Annular Mode on chlorophyll-a in the mid-latitude South Pacific and Indian Oceans
	Yoon, Jae-Seung; Park, Keyhong; Park, Jisoo; Park, Taewook; Kim, Tae-Wook
发表日期	2024
ISSN	1748-9326
起始页码	19
结束页码	4
卷号	19 期号:4
英文摘要	This study investigates the influence of the Southern Annular Mode (SAM) on chlorophyll-a (Chl-a) concentrations and the underlying mechanisms governing their associated environmental variations in the mid-latitude (35-50 degrees S) ocean from 1998 to 2021. The intensification of westerly winds during positive SAM phases influences meridional water transport and mixed layer depth (MLD), which are both critical factors that affect surface nutrient availability. A marked contrast in the relationship between the meridional current anomaly and the SAM was observed, with reduced northward transport of nutrient-rich water in regions north of 50 degrees S during positive SAM phases. This reduction could be attributed to the poleward migration of the westerly winds, which impeded the meridional current from reaching the mid-latitudes. The relationship between SAM and MLD south of 50 degrees S was positive whereas that in the mid-latitude eastern (60-110 degrees E) South Indian Ocean and eastern (90-140 degrees W) South Pacific Ocean was negative or weak. The immediate effect of a more positive SAM on Chl-a in the mid-latitude ocean was reduced productivity caused by enhanced nutrient depletion. However, in the mid-latitude eastern South Pacific Ocean, the northward migration of the zonal mean meridional current anomaly closely aligned with the lagged correlation pattern between SAM variability and Chl-a over time, suggesting that the delayed northward transport of nutrient-rich waters may partially counterbalance the immediate effects of the SAM on ocean productivity. This mechanism was not present in the mid-latitude eastern South Indian Ocean, implying that future climate change may variably affect these regions. Our findings emphasize the importance of considering regional differences and temporal lags when evaluating the influence of SAM variability on ocean productivity and nutrient dynamics in the context of climate change.
英文关键词	Southern Annular Mode; chlorophyll-a; South Pacific Ocean; South Indian Ocean; atmospheric circulation
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001187759800001
来源期刊	ENVIRONMENTAL RESEARCH LETTERS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/290364
作者单位	Korea University; Korea Polar Research Institute (KOPRI); Korea University; Korea University
推荐引用方式 GB/T 7714	Yoon, Jae-Seung,Park, Keyhong,Park, Jisoo,et al. Lagged effect of Southern Annular Mode on chlorophyll-a in the mid-latitude South Pacific and Indian Oceans[J],2024,19(4).
APA	Yoon, Jae-Seung,Park, Keyhong,Park, Jisoo,Park, Taewook,&Kim, Tae-Wook.(2024).Lagged effect of Southern Annular Mode on chlorophyll-a in the mid-latitude South Pacific and Indian Oceans.ENVIRONMENTAL RESEARCH LETTERS,19(4).
MLA	Yoon, Jae-Seung,et al."Lagged effect of Southern Annular Mode on chlorophyll-a in the mid-latitude South Pacific and Indian Oceans".ENVIRONMENTAL RESEARCH LETTERS 19.4(2024).