The Thermocline Biases in the Tropical North Pacific and Their Attributions

doi:10.1175/JCLI-D-20-0675.1

IOCAS-IR > 海洋环流与波动重点实验室

	The Thermocline Biases in the Tropical North Pacific and Their Attributions
	Zhu, Yuchao1,2,3 ; Zhang, Rong-Hua1,2,3,4,5 ; Li, Delei 1,2,3; Chen, Dake 6,7
	2021-03-01
发表期刊	JOURNAL OF CLIMATE
ISSN	0894-8755
卷号	34 期号:5 页码:1635-1648
通讯作者	Zhang, Rong-Hua(rzhang@qdio.ac.cn)
摘要	The tropical thermocline plays an important role in regulating equatorial sea surface temperature (SST); at present, it is still poorly simulated in the state-of-the-art climate models. In this paper, thermocline biases in the tropical North Pacific are investigated using the newly released CMIP6 historical simulations. It is found that CMIP6 models tend to produce an overly shallow thermocline in the northwestern tropics, accompanied by a deep thermocline in the northeastern tropics. A pronounced thermocline strength bias arises in the tropical northeastern Pacific, demonstrating a dipole structure with a sign change at about 8 degrees N. These thermocline biases are accompanied with biases in the simulations of oceanic circulations, including a too weak North Equatorial Countercurrent (NECC), a reduction in water exchanges between the subtropics and the equatorial regions, and an eastward extension of the equatorward interior water transport. The causes of these thermocline biases are further analyzed. The thermocline bias is primarily caused by the model deficiency in simulating the surface wind stress curl, which can be further attributed to the longstanding double-ITCZ bias in the tropical North Pacific. Besides, thermocline strength bias can be partly attributed to the poor prescription of oceanic background diffusivity. By constraining the diffusivity to match observations, the thermocline strength in the tropical northeastern Pacific is greatly increased.
关键词	Climate models Model errors Model evaluation/performance
DOI	10.1175/JCLI-D-20-0675.1
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[41906007] ; National Natural Science Foundation of China[41690122(41690120)] ; National Natural Science Foundation of China[41705082] ; National Natural Science Foundation of China[41421005] ; National Key Research and Development Program of China[2017YFC1404102(2017YFC1404100)] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB 40000000] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB 42000000] ; Shandong Taishan Scholarship ; Earth System Grid Federation (ESGF)
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000615495000005
出版者	AMER METEOROLOGICAL SOC
引用统计	被引频次：12[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/337002/169752
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, Ctr Ocean Megasci, Qingdao, Peoples R China 3.Pilot Natl Lab Marine Sci & Technol Qingdao, Qingdao, Peoples R China 4.Chinese Acad Sci, Ctr Excellence Quaternary Sci & Global Change, Xian, Peoples R China 5.Univ Chinese Acad Sci, Beijing, Peoples R China 6.Minist Nat Resources, Inst Oceanog 2, State Key Lab Satellite Ocean Environm Dynam, Hangzhou, Peoples R China 7.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai, 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
推荐引用方式 GB/T 7714	Zhu, Yuchao,Zhang, Rong-Hua,Li, Delei,et al. The Thermocline Biases in the Tropical North Pacific and Their Attributions[J]. JOURNAL OF CLIMATE,2021,34(5):1635-1648.
APA	Zhu, Yuchao,Zhang, Rong-Hua,Li, Delei,&Chen, Dake.(2021).The Thermocline Biases in the Tropical North Pacific and Their Attributions.JOURNAL OF CLIMATE,34(5),1635-1648.
MLA	Zhu, Yuchao,et al."The Thermocline Biases in the Tropical North Pacific and Their Attributions".JOURNAL OF CLIMATE 34.5(2021):1635-1648.

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
[15200442 - Journal （3211KB）	期刊论文	出版稿	限制开放	CC BY-NC-SA	浏览