气候变化领域集成服务门户(CCPortal): Global Characterization of the Varying Responses of the Standardized Precipitation Evapotranspiration Index to Atmospheric Evaporative Demand

CCPortal

DOI	10.1029/2020JD033017
	Global Characterization of the Varying Responses of the Standardized Precipitation Evapotranspiration Index to Atmospheric Evaporative Demand
	Tomas-Burguera M.; Vicente-Serrano S.M.; Peña-Angulo D.; Domínguez-Castro F.; Noguera I.; El Kenawy A.
发表日期	2020
ISSN	2169897X
卷号	125 期号:17
英文摘要	The standardized precipitation evapotranspiration index (SPEI) is one of the well-established drought metrics worldwide. It is simply computed using precipitation and atmospheric evaporative demand (AED) data. Although AED is considered a key driver of drought variability worldwide, it could have less impact on drought in specific regions and for particular times as a function of the magnitude of precipitation. Specifically, the influence of the AED might overestimate drought severity during both normal and humid periods, resulting in “false alarms” about drought impacts on physical and human environments. Here, we provided a global characterization of the sensitivity of the SPEI to changes of the AED. Results demonstrate that the contribution of AED to drought severity is largely impacted by the spatial and temporal variability of precipitation. Specifically, the impact of AED on drought severity was more pronounced during periods of low precipitation, compared to wet periods. Interestingly, drought severity in humid regions (as revealed by SPEI) also showed low sensitivity to AED under drier conditions. These results highlight the skill of SPEI in identifying the role of AED in drought evolution, especially in arid and semiarid regions whose climate is characterized typically by low precipitation. This advantage was also evident for humid environments, where SPEI did not overestimate drought severity due to the increased AED. These findings highlight the broader applicability of SPEI to accurately characterize drought severity worldwide. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	atmospheric evaporative demand; climate change; drought severity; soil moisture; SPEI
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185795
作者单位	Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas (EEAD–CSIC), Zaragoza, Spain; Instituto Pirenaico de Ecología, Consejo Superior de Investigaciones Científicas (IPE–CSIC), Zaragoza, Spain; Aragonese Agency for Research and Development Researcher (ARAID), Zaragoza, Spain; Department of Geography, University of Zaragoza, Zaragoza, Spain; Department of Geography, Mansoura University, Mansoura, Egypt; Department of Geography, Sultan Qaboos University, Al Khoud, Oman
推荐引用方式 GB/T 7714	Tomas-Burguera M.,Vicente-Serrano S.M.,Peña-Angulo D.,et al. Global Characterization of the Varying Responses of the Standardized Precipitation Evapotranspiration Index to Atmospheric Evaporative Demand[J],2020,125(17).
APA	Tomas-Burguera M.,Vicente-Serrano S.M.,Peña-Angulo D.,Domínguez-Castro F.,Noguera I.,&El Kenawy A..(2020).Global Characterization of the Varying Responses of the Standardized Precipitation Evapotranspiration Index to Atmospheric Evaporative Demand.Journal of Geophysical Research: Atmospheres,125(17).
MLA	Tomas-Burguera M.,et al."Global Characterization of the Varying Responses of the Standardized Precipitation Evapotranspiration Index to Atmospheric Evaporative Demand".Journal of Geophysical Research: Atmospheres 125.17(2020).