干旱区生态环境知识资源中心(Arid): Spatial and Temporal Change in Meteorological Drought in Gansu Province from 1969 to 2018 Based on REOF

Arid

DOI	10.3390/su15119014
	Spatial and Temporal Change in Meteorological Drought in Gansu Province from 1969 to 2018 Based on REOF
	Wang, Yuxuan; Deng, Fan; Cai, Yongxiang; Zhao, Yi
通讯作者	Deng, F
来源期刊	SUSTAINABILITY
EISSN	2071-1050
出版年	2023
卷号	15 期号:11
英文摘要	Meteorological drought is one of the most serious natural disasters, and its impact in arid and semi-arid areas is significant. In order to explore the temporal and spatial distribution of meteorological disasters in Gansu Province, we first calculated the standardized precipitation evapotranspiration index (SPEI) based on the monthly meteorological data from 1969 to 2018 and extracted the drought events through the theory of runs. Then, REOF rotation orthogonal decomposition was performed to divide the study area into five climatic subregions. With each subregion as the basic unit, the variation characteristics and evolution trends of drought events at different time scales were compared based on the B-G segmentation algorithm (BG-algorithm). Finally, a correlation analysis was conducted to explore the driving factors of drought events in each subregion. The main conclusions are as follows: (1) The cumulative duration of drought in the study area showed a slight increase trend (0.475 day/decade) and a 19-year main cycle. The drought intensity showed a trend of first easing and then intensifying, especially after 2000; the drought intensified significantly and showed a spatial trend of decreasing drought in the northwest and worsening drought in the southeast. (2) The cumulative contribution rate of the first five modes of REOF decomposition was 64.46%, and the study was divided into five arid subregions: the Hexi region, middle Hedong region, eastern Hedong region, Wushaoling region and western Hedong region. (3) The meteorological drought in the Hexi region has eased significantly since 1988. In the eastern, central and western parts of the Yellow River, drought intensification was observed to have occurred in different degrees (0.12/decade, 0.129/decade, and 0.072/decade). The meteorological drought in the Wuelyaling region has alleviated significantly with a watershed region formed between drought alleviation and drought intensification. (4) Seasonally, the eastern Hedong region showed a significant trend of drought in spring, but the opposite in autumn. The trend of climate drying was obvious in the spring and summer, rather than in autumn and winter. The spring drought trend is the most obvious in the middle of the Hedong region. (5) The meteorological drought in the study area was affected by local climatic factors and circulation factors, but there were significant differences in the responses of different arid subregions to these factors.
英文关键词	Gansu SPEI REOF drought events temporal and spatial variation
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E ; SSCI
WOS记录号	WOS:001003708900001
WOS类目	Green & Sustainable Science & Technology ; Environmental Sciences ; Environmental Studies
WOS研究方向	Science & Technology - Other Topics ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/398797
推荐引用方式 GB/T 7714	Wang, Yuxuan,Deng, Fan,Cai, Yongxiang,et al. Spatial and Temporal Change in Meteorological Drought in Gansu Province from 1969 to 2018 Based on REOF[J],2023,15(11).
APA	Wang, Yuxuan,Deng, Fan,Cai, Yongxiang,&Zhao, Yi.(2023).Spatial and Temporal Change in Meteorological Drought in Gansu Province from 1969 to 2018 Based on REOF.SUSTAINABILITY,15(11).
MLA	Wang, Yuxuan,et al."Spatial and Temporal Change in Meteorological Drought in Gansu Province from 1969 to 2018 Based on REOF".SUSTAINABILITY 15.11(2023).