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North Pacific Upper-Ocean Cold Temperature Biases in CMIP6 Simulations and the Role of Regional Vertical Mixing
Zhu, Yuchao1,2,3,4; Zhang, Rong-Hua1,2,3,5,6; Sun, Jichang4
2020-09-01
发表期刊JOURNAL OF CLIMATE
ISSN0894-8755
卷号33期号:17页码:7523-7538
通讯作者Zhang, Rong-Hua(rzhang@qdio.ac.cn)
摘要Substantial model biases are still prominent even in the latest CMIP6 simulations; attributing their causes is defined as one of the three main scientific questions addressed in CMIP6. In this paper, cold temperature biases in the North Pacific subtropics are investigated using simulations from the newly released CMIP6 models, together with other related modeling products. In addition, ocean-only sensitivity experiments are performed to characterize the biases, with a focus on the role of oceanic vertical mixing schemes. Based on the Argo-derived diffusivity, idealized vertical diffusivity fields are designed to mimic the seasonality of vertical mixing in this region, and are employed in ocean-only simulations to test the sensitivity of this cold bias to oceanic vertical mixing. It is demonstrated that the cold temperature biases can be reduced when the mixing strength is enhanced within and beneath the surface boundary layer. Additionally, the temperature simulations are rather sensitive to the parameterization of static instability, and the cold biases can be reduced when the vertical diffusivity for convection is increased. These indicate that the cold temperature biases in the North Pacific can be largely attributed to biases in oceanic vertical mixing within ocean-only simulations, which likely contribute to the even larger biases seen in coupled simulations. This study therefore highlights the need for improved oceanic vertical mixing in order to reduce these persistent cold temperature biases seen across several CMIP models.
DOI10.1175/JCLI-D-19-0654.1
收录类别SCI
语种英语
资助项目National Key Research and Development Program of China[2017YFC1404102] ; National Key Research and Development Program of China[2017YFC1404100] ; National Natural Science Foundation of China[41906007] ; National Natural Science Foundation of China[41690122] ; National Natural Science Foundation of China[41690120] ; National Natural Science Foundation of China[41490644] ; National Natural Science Foundation of China[41490640] ; National Natural Science Foundation of China[41421005] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA19060102] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB40000000] ; Taishan Scholarship ; China Postdoctoral Science Foundation[2018M640659] ; National Programme on Global Change and AirSea Interaction[GASI-IPOVAI-06] ; Earth System Grid Federation (ESGF)
WOS研究方向Meteorology & Atmospheric Sciences
WOS类目Meteorology & Atmospheric Sciences
WOS记录号WOS:000615097000016
出版者AMER METEOROLOGICAL SOC
引用统计
被引频次:24[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/337002/169704
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, CAS Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China
2.Chinese Acad Sci, Pilot Natl Lab Marine Sci & Technol Qingdao, Qingdao, Peoples R China
3.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China
4.Shandong Acad Sci, Inst Oceanog Instrumentat, Qingdao, Peoples R China
5.Chinese Acad Sci, Ctr Excellence Quatemary Sci & Global Change, Xian, Peoples R China
6.Univ Chinese Acad Sci, Beijing, Peoples R China
第一作者单位中国科学院海洋研究所;  中国科学院海洋大科学研究中心
通讯作者单位中国科学院海洋研究所;  中国科学院海洋大科学研究中心
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Zhu, Yuchao,Zhang, Rong-Hua,Sun, Jichang. North Pacific Upper-Ocean Cold Temperature Biases in CMIP6 Simulations and the Role of Regional Vertical Mixing[J]. JOURNAL OF CLIMATE,2020,33(17):7523-7538.
APA Zhu, Yuchao,Zhang, Rong-Hua,&Sun, Jichang.(2020).North Pacific Upper-Ocean Cold Temperature Biases in CMIP6 Simulations and the Role of Regional Vertical Mixing.JOURNAL OF CLIMATE,33(17),7523-7538.
MLA Zhu, Yuchao,et al."North Pacific Upper-Ocean Cold Temperature Biases in CMIP6 Simulations and the Role of Regional Vertical Mixing".JOURNAL OF CLIMATE 33.17(2020):7523-7538.
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