气候变化领域集成服务门户(CCPortal): Projected changes in the characteristics of the East Asian summer monsoonal front and their impacts on the regional precipitation

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DOI	10.1007/s00382-021-05687-y
	Projected changes in the characteristics of the East Asian summer monsoonal front and their impacts on the regional precipitation
	Li Y.; Lau N.-C.; Tam C.-Y.; Cheung H.-N.; Deng Y.; Zhang H.
发表日期	2021
ISSN	0930-7575
起始页码	1967
结束页码	1987
卷号	56 期号:2021-11-12
英文摘要	Summer monsoonal rainfall over East Asia is dominated by precipitation associated with the East Asian summer monsoonal front (EASMF). A Community Atmospheric Model (CAM5.1) with a high horizontal resolution of 50 km is employed in this study to investigate the interannual variability as well as projected future trends in the EASMF under the Representative Concentration Pathway 8.5 scenario. Seasonal march of the EASMF is reproduced reasonably well in the model’s present-day simulation despite a northward shift of the simulated front from its observed position. Based upon a suite of objectively-defined daily indices of the EASMF, we show that the EASMF in the late twenty-first century will be more intense and displaced eastward and southward from its present-day mean location. Moreover, EASMF events will exhibit a wider meridional expansion and a longer duration. Monsoonal precipitation over East Asia is particularly sensitive to the meridional displacements of EASMF. In conjunction with the projected southward shift of EASMF, an enhanced rain band is seen to extend northeastward from southern China to the northwestern Pacific south of Japan. This precipitation feature is associated with strengthened and southward-shifted westerly jet streams at 250 and 700 hPa, which are respectively linked to tropical warming in the upper troposphere and warming over the South China Sea in the lower troposphere during the twenty-first century. Within the latitudinal “gap” south of the upper-level jet and north of the lower-level jet, the local vorticity tendencies are maintained by upper-level divergence and lower-level convergence, thus accompanied by enhanced upward motion and precipitation. The site at which this “jet stream-precipitation” relationship prevails is notably modulated by long-term trends in the temperature and circulation patterns associated with climate change. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.
英文关键词	Climate change; East Asian summer monsoonal front; Interannual variability; Precipitation; Westerly jet streams
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183250
作者单位	Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Hong Kong; Department of Geography and Resource Management, The Chinese University of Hong Kong, Hong Kong; Earth System Science Programme, The Chinese University of Hong Kong, Hong Kong; School of Atmospheric Sciences and Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-Sen University, Zhuhai, China; Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, China; Geophysical Institute, University of Bergen, Bergen, Norway; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States
推荐引用方式 GB/T 7714	Li Y.,Lau N.-C.,Tam C.-Y.,et al. Projected changes in the characteristics of the East Asian summer monsoonal front and their impacts on the regional precipitation[J],2021,56(2021-11-12).
APA	Li Y.,Lau N.-C.,Tam C.-Y.,Cheung H.-N.,Deng Y.,&Zhang H..(2021).Projected changes in the characteristics of the East Asian summer monsoonal front and their impacts on the regional precipitation.Climate Dynamics,56(2021-11-12).
MLA	Li Y.,et al."Projected changes in the characteristics of the East Asian summer monsoonal front and their impacts on the regional precipitation".Climate Dynamics 56.2021-11-12(2021).