Rectified Effects of Interannual Chlorophyll Variability on the Tropical Pacific Climate Revealed by a Hybrid Coupled Physics-Biology Model

doi:10.1029/2021JC017263

IOCAS-IR > 海洋环流与波动重点实验室

	Rectified Effects of Interannual Chlorophyll Variability on the Tropical Pacific Climate Revealed by a Hybrid Coupled Physics-Biology Model
	Tian, Feng 1,2,3,4; Zhang, Rong-Hua1,2,3,4,5 ; Wang, Xiujun 6; Zhi, Hai 7
	2021-06-01
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN	2169-9275
卷号	126 期号:6 页码:22
通讯作者	Zhang, Rong-Hua([email protected])
摘要	El Nino-Southern Oscillation (ENSO) induces large interannual chlorophyll variability (ICV) in the tropical Pacific, which modulates shortwave penetration in the upper ocean. However, the extent to which ICV can have rectified effect (higher-frequency process impacts low-frequency climate variability (i.e., ENSO) and mean state) in the tropical Pacific remains unclear. Here, a hybrid coupled physics-biogeochemistry model with tunable coupling ocean-atmosphere intensity (alpha) is used to examine this rectified effect. The simulations consist of a control run in which the ICV effect is represented in the model and the other with the ICV effect being purposely excluded by only reserving the climatological chlorophyll field. Results show that the ICV effect depends on alpha; ENSO amplitude is reduced by 12%-40% with decreased annual mean sea surface temperature by 0.05-0.4 degrees C in the eastern equatorial Pacific when taking alpha = 0.8-1.15. A stability analysis reveals that the ICV effect on ENSO exhibits two feedback loops. (a) Positive (negative) chlorophyll anomalies during La Nina (El Nino) act to increase (decrease) shortwave absorption within the mixed layer, which enhances thermodynamic damping (slightly weakening ENSO amplitude). (b) Chlorophyll anomalies modulate vertical redistribution of penetrative shortwave radiation between the mixed layer and subsurface layers; this differential heating affects ocean stratification and vertical mixing, which weakens the thermocline and Ekman feedback (predominantly weakening ENSO amplitude). Additionally, ICV exhibits asymmetric effects on ENSO evolution, with the El Nino amplitude being damped stronger than La Nina; this residual effect leads to a net cooling condition in the eastern tropical Pacific. Plain Language Summary As a proxy of marine phytoplankton biomass, ocean chlorophyll not only responds to El Nino-Southern Oscillation (ENSO) phase change but also exerts a significant influence on ENSO and mean state through modulating the absorbed shortwave radiation in the upper ocean. However, the extent to which interannual chlorophyll variability (ICV) can have rectified effect (higher-frequency process impacts low-frequency climate variability and mean state) in the tropical Pacific remains unclear. In this study, we examine the rectified effect of ICV on the tropical Pacific climate by performing a series of numerical simulations. By isolating the ICV effect from the climatological mean chlorophyll field, we found that ICV acts to weaken ENSO amplitude and induces a cooling effect in the eastern equatorial Pacific, characterized by a La Nina-like pattern. A stability analysis reveals that the weakened responses of the thermocline or upwelling to the zonal wind stress (the thermocline and Ekman feedbacks) due to the ICV effect dominantly reduce ENSO amplitude. Furthermore, the stronger damping effect on El Nino due to ICV leads to a net cooling mean-state. Given the pronounced rectified effect of ICV on the tropical Pacific climate, further efforts are needed to adequately represent multi-scale ocean physics-biology interactions for improving earth system modeling.
DOI	10.1029/2021JC017263
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China (NFSC)[42030410]; National Natural Science Foundation of China (NFSC)[41690122(41690120)]; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB 40000000]; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA19060102]; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42000000]; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42040100]; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42040103]; National Key Research and Development Program of China[2017YFC1404102]; National Key Research and Development Program of China[2017YFC1404100]; National Natural Science Foundation of China (NSFC)[42006001]; China Postdoctoral Science Foundation[2019M662453]; Qingdao postdoctoral application research project
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000665203500037
出版者	AMER GEOPHYSICAL UNION
引用统计	被引频次：7[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/337002/176970
专题	海洋环流与波动重点实验室
通讯作者	Zhang, Rong-Hua
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 2.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China 3.Pilot Natl Lab Marine Sci & Technol, Lab Ocean & Climate Dynam, Qingdao, Peoples R China 4.Univ Chinese Acad Sci, Beijing, Peoples R China 5.Chinese Acad Sci, Ctr Excellence Quaternary Sci & Global Change, Xian, Peoples R China 6.Beijing Normal Univ, Coll Global Change & Earth Syst Sci, Beijing, Peoples R China 7.Nanjing Univ Informat Sci & Technol, Coll Atmospher Sci, Nanjing, Peoples R China
第一作者单位	海洋环流与波动重点实验室
通讯作者单位	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Tian, Feng,Zhang, Rong-Hua,Wang, Xiujun,et al. Rectified Effects of Interannual Chlorophyll Variability on the Tropical Pacific Climate Revealed by a Hybrid Coupled Physics-Biology Model[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2021,126(6):22.
APA	Tian, Feng,Zhang, Rong-Hua,Wang, Xiujun,&Zhi, Hai.(2021).Rectified Effects of Interannual Chlorophyll Variability on the Tropical Pacific Climate Revealed by a Hybrid Coupled Physics-Biology Model.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,126(6),22.
MLA	Tian, Feng,et al."Rectified Effects of Interannual Chlorophyll Variability on the Tropical Pacific Climate Revealed by a Hybrid Coupled Physics-Biology Model".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 126.6(2021):22.

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