干旱区生态环境知识资源中心(Arid): Flash Drought Characteristics by Different Severities in Humid Subtropical Basins: A Case Study in the Gan River Basin, China

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DOI	10.1175/JCLI-D-20-0596.1
	Flash Drought Characteristics by Different Severities in Humid Subtropical Basins: A Case Study in the Gan River Basin, China
	Zhang, Yuqing; You, Qinglong; Mao, Guangxiong; Chen, Changchun; Li, Xin; Yu, Jinhua
通讯作者	You, QL (corresponding author)，Fudan Univ, Dept Atmospher & Ocean Sci, Shanghai, Peoples R China. ; You, QL (corresponding author)，Fudan Univ, Inst Atmospher Sci, Shanghai, Peoples R China.
来源期刊	JOURNAL OF CLIMATE
ISSN	0894-8755
EISSN	1520-0442
出版年	2021
卷号	34 期号:18
英文摘要	It is essential to assess flash drought risk based on a reliable flash drought intensity (severity) index incorporating comprehensive information of the rapid decline (flash) in soil moisture toward drought conditions and soil moisture thresholds belonging to the drought category. In this study, we used the Gan River basin as an example to define a flash drought intensity index that can be calculated for individual time steps (pentads) during a flash drought period over a given grid (or station). The severity of a complete flash drought event is the sum of the intensity values during the flash drought. We explored the spatial and temporal characteristics of flash droughts with different grades based on their respective severities. The results show that decreases in total cloud cover, precipitation, and relative humidity, as well as increases in 500-hPa geopotential height, convective inhibition, temperature, vapor pressure deficit, and wind speed can create favorable conditions for the occurrence of flash droughts. Although flash droughts are relatively frequent in the central and southern parts of the basin, the severity is relatively high in the northern part of the basin due to longer duration. Flash drought severity shows a slightly downward trend due to decreases in frequency, duration, and intensity from 1961 to 2018. Extreme and exceptional flash droughts decrease significantly while moderate and severe flash droughts trend slightly upward. Flash drought severity appears to be more affected by the interaction between duration and intensity as the grade increases from mild to severe. The frequency and duration of flash droughts are higher in July-October. The southern part of the basin is more prone to moderate and severe flash droughts, while the northern parts of the basin are more vulnerable to extreme and exceptional flash droughts due to longer durations and greater severities than other parts. Moderate, severe, extreme, and exceptional flash droughts occurred at approximately 3-6, 5-15 , 10-50-, and 30-200-yr intervals, respectively, based on the copula analysis.
英文关键词	Drought Extreme events Climate change Climatology Annual variations Climate variability
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000752626900001
WOS关键词	WARM-SEASON DROUGHT ; ARID REGION ; FREQUENCY ; ONSET ; INTENSIFICATION ; MODEL ; INDEX ; RISK
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/2XILL650/375923
作者单位	[Zhang, Yuqing; You, Qinglong] Fudan Univ, Dept Atmospher & Ocean Sci, Shanghai, Peoples R China; [Zhang, Yuqing; You, Qinglong] Fudan Univ, Inst Atmospher Sci, Shanghai, Peoples R China; [Zhang, Yuqing; Mao, Guangxiong] Huaiyin Normal Univ, Sch Urban & Environm Sci, Huaian, Peoples R China; [Chen, Changchun] Nanjing Univ Informat Sci & Technol NUIST, Sch Geog Sci, Nanjing, Peoples R China; [Li, Xin; Yu, Jinhua] NUIST, Key Lab Meteorol Disaster, Minist Educ KLME, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Nanjing, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yuqing,You, Qinglong,Mao, Guangxiong,et al. Flash Drought Characteristics by Different Severities in Humid Subtropical Basins: A Case Study in the Gan River Basin, China[J],2021,34(18).
APA	Zhang, Yuqing,You, Qinglong,Mao, Guangxiong,Chen, Changchun,Li, Xin,&Yu, Jinhua.(2021).Flash Drought Characteristics by Different Severities in Humid Subtropical Basins: A Case Study in the Gan River Basin, China.JOURNAL OF CLIMATE,34(18).
MLA	Zhang, Yuqing,et al."Flash Drought Characteristics by Different Severities in Humid Subtropical Basins: A Case Study in the Gan River Basin, China".JOURNAL OF CLIMATE 34.18(2021).