Potential causes of megadroughts in North China in the preindustrial period from the teleconnection perspective

doi:10.1016/j.gloplacha.2021.103596

	Potential causes of megadroughts in North China in the preindustrial period from the teleconnection perspective
	Zhang, Xuezhen 1,3; Bai, Mengxin 1,2,3; Hao, Zhixin 1,3; Zheng, Jingyun 1,3
刊名	GLOBAL AND PLANETARY CHANGE
	2021-10-01
卷号	205 页码:10
关键词	North China External forcing Teleconnection Megadrought Atmospheric circulation anomaly
ISSN号	0921-8181
DOI	10.1016/j.gloplacha.2021.103596
通讯作者	Zheng, Jingyun(zhengjy@igsnrr.ac.cn)
英文摘要	The potential causes of megadroughts over North China (NC) in the preindustrial period were investigated using eight climate models evolved using CMIP5/PMIP3 and multiple proxy data. The full forcing experiments driven by both external forcing and internal variability show that megadroughts in NC were accompanied by extensive decadal drying over the Northern Hemisphere (NH), particularly in most of North America and Europe. The spatial pattern of hydroclimate matched well with the proxy-based illustration. However, such hydroclimate conditions over NH were difficult to reproduce in control experiments driven solely by internal variability. This finding suggests that external forcing may be a crucial factor leading to megadroughts in NC and simultaneous decadal drying over the NH. Moreover, external forcing may lead to climate cooling. Climate cooling weakened the pressure gradient from the West Pacific to East Asia and hence reduced the water vapor to land; meanwhile, local vertical downward movement occurred in the cooling climate background, which was unfavorable to air convection over NC. Both reduced water vapor and weakened air convection led to less precipitation. Meanwhile, there was a negative NAO, which intensified the eastward wave train at mid-latitudes. Consequently, the North American trough and European trough deepened, the northerlies in the post trough pattern intensified, and the water vapor from the high-latitude continent or polar areas was low, which was unfavorable to precipitation. This study implies that the megadrought in NC and simultaneous hydroclimatic spatial pattern over the NH may be underestimated in the CMIP5 climate prediction, which excludes external forcing.
资助项目	National Key R&D Program of China on Global Change[2016YFA0600401] ; National Key R&D Program of China on Global Change[2017YFA0603301] ; Key Research Program of Frontier Sciences from CAS[ZDRWZS-2017-4]
WOS关键词	EASTERN CHINA ; LAST MILLENNIUM ; PRECIPITATION VARIABILITY ; GRAIN PRODUCTION ; DROUGHT ; CLIMATE ; PATTERNS ; MONSOON ; EVENTS ; INDEX
WOS研究方向	Physical Geography ; Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000693570500005
资助机构	National Key R&D Program of China on Global Change ; Key Research Program of Frontier Sciences from CAS
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/165408]
专题	中国科学院地理科学与资源研究所
通讯作者	Zheng, Jingyun
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing 100101, Peoples R China 2.Beijing Normal Univ, Fac Geog Sci, Beijing 100875, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Xuezhen,Bai, Mengxin,Hao, Zhixin,et al. Potential causes of megadroughts in North China in the preindustrial period from the teleconnection perspective[J]. GLOBAL AND PLANETARY CHANGE,2021,205:10.
APA	Zhang, Xuezhen,Bai, Mengxin,Hao, Zhixin,&Zheng, Jingyun.(2021).Potential causes of megadroughts in North China in the preindustrial period from the teleconnection perspective.GLOBAL AND PLANETARY CHANGE,205,10.
MLA	Zhang, Xuezhen,et al."Potential causes of megadroughts in North China in the preindustrial period from the teleconnection perspective".GLOBAL AND PLANETARY CHANGE 205(2021):10.