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DOI	10.1175/JCLI-D-20-0231.1
	The contribution of internal variability to asian midlatitude warming
	Feng X.; Wu L.
发表日期	2021
ISSN	08948755
起始页码	2429
结束页码	2439
卷号	34 期号:7
英文摘要	The tropospheric warming in the Northern Hemisphere (NH) midlatitudes has been an important factor in regulating weather and climate since the twentieth century. Apart from anthropogenic forcing leading to the midlatitude warming, this study investigates the possible contribution of internal variability to Asian midlatitude warming and its role in East Asian circulation changes in boreal summer, using four reanalysis datasets in the past century and a set of 1800-yr preindustrial control simulations of the Community Earth System Model version 1 large ensemble (CESM-LE). The surface and tropospheric warming in the Asian midlatitudes is associated with a strong upper-level geopotential height rise north of the Tibetan Plateau (TP). Linear trends of 200-hPa geopotential height (Z200) confirm a dipole of an anomalous high north of the TP and an anomalous low over the Iranian Plateau in 1958-2017. The leading internal circulation mode bears a striking resemblance to the Z200 trend in the past 60 and 111 years, indicating that the long-term trend may be partially of internal origin. The Asian midlatitude warming is also found in preindustrial simulations of CESM-LE, further suggesting that internal variability explains at least part of the temperature change in theAsian midlatitudes, which is in a chain of wave trains along the NH midlatitudes. The Asian warming decreases the meridional gradient of geopotential height, resulting in the weakening of westerly winds over the TP and the TP thermal forcing. Thus, it is essential to consider the role of internal variability in shaping East Asian surface temperature and East Asian summer monsoon changes in the past decades. © 2021 American Meteorological Society.
英文关键词	Asia; Atmospheric circulation; Climate change; Climate models; Multidecadal variability
语种	英语
scopus关键词	Large dataset; Anthropogenic forcing; East Asian summer monsoon; Geo-potential heights; Internal circulations; Internal variability; Meridional gradients; Surface temperatures; Tropospheric warming; Troposphere; atmospheric circulation; climate change; climate modeling; decadal variation; midlatitude environment; trend analysis; warming; westerly; China; Qinghai-Xizang Plateau
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178591
作者单位	Key Laboratory of Meteorological Disaster, Ministry of Education, Nanjing University of Information Science and Technology, Nanjing, China; Department of Atmospheric and Oceanic Sciences, Institute of Atmospheric Sciences, Fudan University, Shanghai, China; Innovation Center of Ocean and Atmosphere System, Zhuhai Fudan Innovation Research Institute, Zhuhai, China
推荐引用方式 GB/T 7714	Feng X.,Wu L.. The contribution of internal variability to asian midlatitude warming[J],2021,34(7).
APA	Feng X.,&Wu L..(2021).The contribution of internal variability to asian midlatitude warming.Journal of Climate,34(7).
MLA	Feng X.,et al."The contribution of internal variability to asian midlatitude warming".Journal of Climate 34.7(2021).