气候变化领域集成服务门户(CCPortal): Coupling ocean–atmosphere intensity determines ocean chlorophyll-induced SST change in the tropical Pacific

CCPortal

DOI	10.1007/s00382-021-05666-3
	Coupling ocean–atmosphere intensity determines ocean chlorophyll-induced SST change in the tropical Pacific
	Tian F.; Zhang R.-H.; Wang X.
发表日期	2021
ISSN	0930-7575
起始页码	1251
结束页码	1264
卷号	56 期号:2021-11-12
英文摘要	Phytoplankton pigments (e.g., chlorophyll-a) absorb solar radiation in the upper ocean and induce a pronounced radiant heating effect (chlorophyll effect) on the climate. However, the ocean chlorophyll-induced heating effect on the mean climate state in the tropical Pacific has not been understood well. Here, a hybrid coupled model (HCM) of the atmosphere, ocean physics and biogeochemistry is used to investigate the chlorophyll effect on sea surface temperature (SST) in the eastern equatorial Pacific; a tunable coefficient, α, is introduced to represent the coupling intensity between the atmosphere and ocean in the HCM. The modeling results show that the chlorophyll effect on the mean-state SST is sensitively dependent on α (the coupling intensity). At weakly represented coupling intensity (0 ≤ α < 1.01), the chlorophyll effect tends to induce an SST cooling in the eastern equatorial Pacific, whereas an SST warming emerges at the strongly represented coupling intensity (α ≥ 1.01). Thus, a threshold exists for the coupling intensity (about α = 1.01) at which the sign of SST responses can change. Mechanisms and processes are illustrated to understand the different SST responses. In the weak coupling cases, indirect dynamical cooling processes (the adjustment of ocean circulation, enhanced vertical mixing, and upwelling) tend to dominate the SST cooling. In the strong coupling cases, the persistent warming induced by chlorophyll in the southern subtropical Pacific tends to induce cross-equatorial northerly winds, which shifts to anomalous westerly winds in the eastern equatorial Pacific, consequently reducing the evaporative cooling and weakening indirect dynamical cooling; eventually, SST warming maintains in the eastern equatorial Pacific. These results provide new insights into the biogeochemical feedback on the climate and bio-physical interactions in the tropical Pacific. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183259
作者单位	Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, and Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China; Laboratory for Ocean and Climate Dynamics, Pilot National Laboratory for Marine Science and Technology, Qingdao, 266237, China; University of Chinese Academy of Sciences, Beijing, 10029, China; Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi’an, 710061, China; College of Global Change and Earth System Science, Beijing Normal University, and Joint Center for Global Change Studies, Beijing, 100875, China
推荐引用方式 GB/T 7714	Tian F.,Zhang R.-H.,Wang X.. Coupling ocean–atmosphere intensity determines ocean chlorophyll-induced SST change in the tropical Pacific[J],2021,56(2021-11-12).
APA	Tian F.,Zhang R.-H.,&Wang X..(2021).Coupling ocean–atmosphere intensity determines ocean chlorophyll-induced SST change in the tropical Pacific.Climate Dynamics,56(2021-11-12).
MLA	Tian F.,et al."Coupling ocean–atmosphere intensity determines ocean chlorophyll-induced SST change in the tropical Pacific".Climate Dynamics 56.2021-11-12(2021).