Sensitivity of asymmetric oxygen minimum zones to mixing intensity and stoichiometry in the tropical Pacific using a basin-scale model (OGCM-DMEC V1.4)

doi:10.5194/gmd-15-1017-2022

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	Sensitivity of asymmetric oxygen minimum zones to mixing intensity and stoichiometry in the tropical Pacific using a basin-scale model (OGCM-DMEC V1.4)
	Wang, Kai1 ; Wang, Xiujun 1,2; Murtugudde, Raghu 2; Zhang, Dongxiao 3,4; Zhang, Rong-Hua5
	2022-02-03
发表期刊	GEOSCIENTIFIC MODEL DEVELOPMENT
ISSN	1991-959X
卷号	15 期号:3 页码:1017-1035
通讯作者	Wang, Xiujun(xwang@bnu.edu.cn)
摘要	The tropical Pacific Ocean holds the two largest oxygen minimum zones (OMZs) in the world's oceans, showing a prominent hemispheric asymmetry, with a much stronger and broader OMZ north of the Equator. However, many models have difficulties in reproducing the observed asymmetric OMZs in the tropical Pacific. Here, we apply a fully coupled basin-scale model to evaluate the impacts of stoichiometry and the intensity of vertical mixing on the dynamics of OMZs in the tropical Pacific. We first utilize observational data of dissolved oxygen (DO) to calibrate and validate the basin-scale model. Our model experiments demonstrate that enhanced vertical mixing combined with a reduced O : C utilization ratio can significantly improve our model capability of reproducing the asymmetric OMZs. Our study shows that DO concentration is more sensitive to biological processes over 200-400 m but to physical processes below 400 m. Applying an enhanced vertical mixing causes a modest increase in physical supply (1-2 mmol m(-3) yr(-1)) and a small increase (< 0.5 mmol m(-3) yr(-1)) in biological consumption over 200-1000 m, whereas applying a reduced O : C utilization ratio leads to a large decrease (28 mmol m(-3) yr(-1)) in both biological consumption and physical supply in the OMZs. Our analyses suggest that biological consumption (greater rate to the south than to the north) cannot explain the asymmetric distribution of mid-depth DO in the tropical Pacific, but physical supply (stronger vertical mixing to the south) plays a major role in regulating the asymmetry of the tropical Pacific's OMZs. This study also highlights the important roles of physical and biological interactions and feedbacks in contributing to the asymmetry of OMZs in the tropical Pacific.
DOI	10.5194/gmd-15-1017-2022
收录类别	SCI
语种	英语
资助项目	Chinese Academy of Sciences' Strategic Priority Project[XDA1101010504]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000752600400001
出版者	COPERNICUS GESELLSCHAFT MBH
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/178003
专题	中国科学院海洋研究所
通讯作者	Wang, Xiujun
作者单位	1.Beijing Normal Univ, Coll Global Change & Earth Syst Sci, Beijing 100875, Peoples R China 2.Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20740 USA 3.Univ Washington, Pacific Marine Environm Lab, Seattle, WA 98115 USA 4.NOAA, Seattle, WA 98115 USA 5.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Wang, Kai,Wang, Xiujun,Murtugudde, Raghu,et al. Sensitivity of asymmetric oxygen minimum zones to mixing intensity and stoichiometry in the tropical Pacific using a basin-scale model (OGCM-DMEC V1.4)[J]. GEOSCIENTIFIC MODEL DEVELOPMENT,2022,15(3):1017-1035.
APA	Wang, Kai,Wang, Xiujun,Murtugudde, Raghu,Zhang, Dongxiao,&Zhang, Rong-Hua.(2022).Sensitivity of asymmetric oxygen minimum zones to mixing intensity and stoichiometry in the tropical Pacific using a basin-scale model (OGCM-DMEC V1.4).GEOSCIENTIFIC MODEL DEVELOPMENT,15(3),1017-1035.
MLA	Wang, Kai,et al."Sensitivity of asymmetric oxygen minimum zones to mixing intensity and stoichiometry in the tropical Pacific using a basin-scale model (OGCM-DMEC V1.4)".GEOSCIENTIFIC MODEL DEVELOPMENT 15.3(2022):1017-1035.

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