North Pacific Upper-Ocean Cold Temperature Biases in CMIP6 Simulations and the Role of Regional Vertical Mixing

doi:10.1175/JCLI-D-19-0654.1

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋环流与波动重点实验室

	North Pacific Upper-Ocean Cold Temperature Biases in CMIP6 Simulations and the Role of Regional Vertical Mixing
	Zhu, Yuchao 1,4,5,6; Zhang, Rong-Hua 2,3,4,5,6; Sun, Jichang 1
刊名	JOURNAL OF CLIMATE
	2020-09-01
卷号	33 期号:17 页码:7523-7538
ISSN号	0894-8755
DOI	10.1175/JCLI-D-19-0654.1
通讯作者	Zhang, Rong-Hua(rzhang@qdio.ac.cn)
英文摘要	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.
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
语种	英语
出版者	AMER METEOROLOGICAL SOC
WOS记录号	WOS:000615097000016
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/169703]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Zhang, Rong-Hua
作者单位	1.Shandong Acad Sci, Inst Oceanog Instrumentat, Qingdao, Peoples R China 2.Chinese Acad Sci, Ctr Excellence Quatemary Sci & Global Change, Xian, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 5.Chinese Acad Sci, Pilot Natl Lab Marine Sci & Technol Qingdao, Qingdao, Peoples R China 6.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	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.