Mesoscale SST perturbation-induced impacts on climatological precipitation in the Kuroshio-Oyashio extension region,as revealed by the WRF simulations

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	Mesoscale SST perturbation-induced impacts on climatological precipitation in the Kuroshio-Oyashio extension region,as revealed by the WRF simulations
	GAO Jiaxiang ; ZHANG Rong-Hua; WANG Hongna
发表期刊	Journal of Oceanology and Limnology
ISSN	2096-5508
	2019-03-15
出版年	2019
卷号	v.37 期号:02 页码:13-25
文献类型	CNKI期刊论文
摘要	Mesoscale coupling between perturbations of mesoscale sea surface temperature(SST) and lowlevel winds has been extensively studied using available high-resolution satellite observations. However, the climatological impacts of mesoscale SST perturbations(SST_(meso)) on the free atmosphere have not been fully understood. In this study, the rectified ef fect of SST_(meso) on local climatological precipitation in the KuroshioOyashio Extension(KOE) region is investigated using the Weather Research and Forecasting(WRF)Model; two runs are performed, one forced by low-resolution SST fields(almost no mesoscale signals) and another by additional high-resolution SST_(meso) fields extracted from satellite observations. Climatological precipitation response to SST_(meso) is characterized mainly by enhanced precipitation on the warmer flank of three oceanic SST fronts in this region. The results show that the positive correlation between the 10-m wind speed perturbations and SST_(meso) is well captured by the WRF model with a reasonable spatial pattern but relatively weak strength. The addition of SST_(meso) improves the climatological precipitation simulated by WRF with a better representation of fine-scale structures compared with satellite observations. A closer examination on the underlying mechanism suggests that while the pressure adjustment mechanism can explain the climatological precipitation enhancement along the fronts and the relatively high contribution of the convective precipitation, other factors such as synoptic events should also be taken into consideration to account for the seasonality of the precipitation response.
关键词	mesoscale SST perturbations and ef fects WRF model Kuroshio-Oyashio Extension climatological precipitation
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A009;
CNKI专题名称	气象学;
分类号	P461.2
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	Supported by the National Key Research and Development Program of China(Nos.2017YFC1404102,2017YFC1404100) ; the National Natural Science Foundation of China(Nos.41490644,41490640) ; the Chinese Academy of Sciences Strategic Priority Project,the Western Pacific Ocean System(No.XDA11010105) ; the NSFC-Shandong Joint Fund for Marine Science Research Centers(No.U1406402) ; the Taishan Scholarship and the Recruitment Program of Global Experts
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/188615
专题	中国科学院海洋研究所
作者单位	1.CASKeyLaboratoryofOceanCirculationandWaves,InstituteofOceanology,ChineseAcademyofSciences 2.UniversityofChineseAcademyofSciences 3.LaboratoryforOceanDynamicsandClimate,QingdaoNationalLaboratoryforMarineScienceandTechnology
推荐引用方式 GB/T 7714	GAO Jiaxiang,ZHANG Rong-Hua,WANG Hongna. Mesoscale SST perturbation-induced impacts on climatological precipitation in the Kuroshio-Oyashio extension region,as revealed by the WRF simulations. 2019.