干旱区生态环境知识资源中心(Arid): Higher atmospheric evapotranspiration demand intensified drought in semi-arid sandy lands, northern China

Arid

DOI	10.1002/joc.8030
	Higher atmospheric evapotranspiration demand intensified drought in semi-arid sandy lands, northern China
	Hu, Hongjiao; Liu, Xinping; He, Yuhui; Zhang, Tonghui; Xu, Yuanzhi; Wang, Lilong
通讯作者	Liu, XP
来源期刊	INTERNATIONAL JOURNAL OF CLIMATOLOGY
ISSN	0899-8418
EISSN	1097-0088
出版年	2023
卷号	43 期号:7 页码:3298-3311
英文摘要	Drought seriously endangers the development of agro-pastoral ecotone in arid and semi-arid regions. However, drought evolution characteristics of semi-arid sandy grassland and its drivers are not well understood in the complex climate change context. Thus, in this paper, the revised standardized precipitation evaporation indices on one-month (SPEI-1) and growing-season (SPEI-6) scale, flash drought and dry spells (DS) were calculated as drought indicators, and the temporal variabilities and meteorological drivers of drought in Horqin Sandy Land during the growing period (April-September) from 2007 to 2021 were studied. The results showed that SPEI-1 and SPEI-6 exhibited negative trends and periodic change. This drought aggravation was manifested in increased grades and numbers of drought months. Flash droughts can occur every month during the growing season. And its occurrence was not only positively correlated with all drought events in frequency but also synchronized in time. The increased number of DS showed an asymmetrical shift towards 7-day-and-longer DS. SPEI sensitivity to precipitation (P) was noticeably higher than to atmospheric evapotranspiration demand (AED) at both monthly and growing season scales. SPEI sensitivity to AED was modulated by P amounts, which was higher during low P period. Apart from the amounts of P and AED, their temporal variability also strongly determined how they affect the drought severity. P was also the main driver for flash drought and long DS, but AED with larger amount and higher variability is the reason for their aggravation. Our results demonstrate the complexity of drought intensification in semi-arid sandy grasslands and highlight the important role of AED anomalies in it.
英文关键词	dry spell flash drought meteorological driving factor SPEI temporal variation
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000936936200001
WOS关键词	INNER-MONGOLIA ; DRY SPELLS ; SPATIAL-DISTRIBUTION ; RIVER-BASIN ; EXTREME WET ; INDEX SPEI ; PRECIPITATION ; VEGETATION ; VARIABILITY ; PLATEAU
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/396969
推荐引用方式 GB/T 7714	Hu, Hongjiao,Liu, Xinping,He, Yuhui,et al. Higher atmospheric evapotranspiration demand intensified drought in semi-arid sandy lands, northern China[J],2023,43(7):3298-3311.
APA	Hu, Hongjiao,Liu, Xinping,He, Yuhui,Zhang, Tonghui,Xu, Yuanzhi,&Wang, Lilong.(2023).Higher atmospheric evapotranspiration demand intensified drought in semi-arid sandy lands, northern China.INTERNATIONAL JOURNAL OF CLIMATOLOGY,43(7),3298-3311.
MLA	Hu, Hongjiao,et al."Higher atmospheric evapotranspiration demand intensified drought in semi-arid sandy lands, northern China".INTERNATIONAL JOURNAL OF CLIMATOLOGY 43.7(2023):3298-3311.