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An ocean modeling study to quantify wind forcing and oceanic mixing effects on the tropical North Pacific subsurface warm bias in CMIP and OMIP simulations

文献类型：期刊论文

作者Zhu, Yuchao1,2,3; Zhang, Rong-Hua1,2,3,4,5; Li, Delei1,2,3
刊名CLIMATE DYNAMICS
出版日期2021-09-05
页码16
关键词Model errors Subsurface temperature bias CMIP OMIP simulations Vertical mixing scheme Wind forcing errors
ISSN号0930-7575
DOI10.1007/s00382-021-05946-y
通讯作者Zhang, Rong-Hua(rzhang@qdio.ac.cn)
英文摘要Sea surface temperature (SST) bias in the climate models has been a focus in the past, but subsurface temperature biases have not received much attention yet. In this study, subsurface temperature biases in the tropical North Pacific (TNP) are investigated by analyzing the CMIP6, CMIP5 and OMIP products, and by performing ocean model simulations. It is found that almost all the CMIP and OMIP simulations have a pronounced subsurface warm bias (SWB) in the northeastern tropical Pacific (NETP), and the model developments over the past decade do not indicate obvious improvements in bias pattern and magnitude from CMIP5 to the latest version CMIP6. This SWB is primarily caused by the model deficiencies in the simulated surface wind stress curl (WSC) in the NETP, which is too weak to produce a sufficient Ekman upwelling, a bias that also exists in OMIP simulations. The uncertainties in the parameterizations of the oceanic vertical mixing processes also make a great contribution, and it is demonstrated that the estimated oceanic vertical diffusivities are overestimated both in the upper boundary layer and the interior in the CMIP and OMIP simulations. The relationships between the SWB and the misrepresented oceanic vertical mixing processes are investigated by conducting several ocean-only experiments, in which the upper boundary layer mixing is modified by reducing the wind stirring effect in the Kraus-Turner type bulk mixed-layer scheme, and the interior mixing is constrained by using the Argo-derived diffusivity. By applying these modifications to oceanic vertical mixing schemes, the SWB is greatly reduced in the NETP. The consequences of this SWB are further analyzed. Because the thermal structure in the NETP can influence the simulations of oceanic circulations and equatorial upper-ocean thermal structure, the large SWB in the CMIP6 models tends to produce a weak equatorward water transport in the subsurface TNP, a weak equatorial upwelling and a warm equatorial upper ocean.
资助项目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[42030410] ; 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
WOS研究方向Meteorology & Atmospheric Sciences
语种英语
WOS记录号WOS:000698081400001
出版者SPRINGER
源URL[http://ir.qdio.ac.cn/handle/337002/176457]  
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.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China
2.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, 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 710061, Peoples R China
5.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Zhu, Yuchao,Zhang, Rong-Hua,Li, Delei. An ocean modeling study to quantify wind forcing and oceanic mixing effects on the tropical North Pacific subsurface warm bias in CMIP and OMIP simulations[J]. CLIMATE DYNAMICS,2021:16.
APA Zhu, Yuchao,Zhang, Rong-Hua,&Li, Delei.(2021).An ocean modeling study to quantify wind forcing and oceanic mixing effects on the tropical North Pacific subsurface warm bias in CMIP and OMIP simulations.CLIMATE DYNAMICS,16.
MLA Zhu, Yuchao,et al."An ocean modeling study to quantify wind forcing and oceanic mixing effects on the tropical North Pacific subsurface warm bias in CMIP and OMIP simulations".CLIMATE DYNAMICS (2021):16.

入库方式： OAI收割

来源：海洋研究所

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