气候变化领域集成服务门户(CCPortal): Exploring trends in wet-season precipitation and drought indices in wet, humid and dry regions

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DOI	10.1088/1748-9326/ab4a6c
	Exploring trends in wet-season precipitation and drought indices in wet, humid and dry regions
	Funk C.; Harrison L.; Alexander L.; Peterson P.; Behrangi A.; Husak G.
发表日期	2019
ISSN	17489318
卷号	14 期号:11
英文摘要	This study examines wet season droughts using eight products from the Frequent Rainfall Observations on GridS database. The study begins by evaluating wet season precipitation totals and wet day counts at seasonal and decadal time scales. While we find a high level of agreement among the products at a seasonal time scale, evaluations of 10 year variability indicate substantial non-stationary inter-product differences that make the assessment of low-frequency changes difficult, especially in data-sparse regions. Some products, however, appear more reliable than others on decadal time scales. Global time series of dry, middle, and wet region standardized precipitation index time series indicate little coherent change. There is substantial coherence in year-to-year variations in these time series for the better-performing products, likely indicative of skill for monitoring variations at large spatial scales. During the wet season, the data do not appear to indicate widespread global changes in precipitation, reference evapotranspiration (RefET) or Standardized Precipitation Evapotranspiration Index (SPEI) values. These data also do not indicate a global shift towards increasing aridity. Focusing on SPEI values for dry regions during droughts, however, we find modest increases in RefET and decreases in SPEI when wet season precipitation is below normal. Dry region SPEI values during droughts have decreased by -0.2 since the 1990s. The cause of these RefET increases is unclear, and more detailed analysis will be needed to confirm these results. For wet regions, however, the majority of products appear to indicate increases in wet season precipitation, although many products perform poorly in these regions due to limited observation networks, and estimated increases vary substantially. Synopsis: Our analysis indicates a lack of increasing aridity at global scales, issues associated with non-stationary systematic errors, and concerns associated with increases in reference evapotranspiration in global dry regions during droughts. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	climate change; drought; evapotranspiration; global warming; precipitation; precipitation extremes; satellite precipitation
语种	英语
scopus关键词	Climate change; Evapotranspiration; Global warming; Precipitation (chemical); Systematic errors; Time measurement; Time series; Decadal timescale; Increasing aridities; Limited observations; Low-frequency changes; Precipitation extremes; Reference evapotranspiration; Satellite precipitation; Standardized precipitation index; Drought; arid region; climate change; drought; evapotranspiration; extreme event; global warming; humid environment; precipitation (climatology); trend analysis
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154734
作者单位	US Geological Survey Earth Resources Observation and Science Center, United States; UC Santa Barbara Climate Hazards Center, United States; Climate Change Research Centre and ARC Centre of Excellence for Climate Extremes, UNSW Sydney, Australia; Department of Hydrology and Atmospheric Sciences, University of Arizona, United States
推荐引用方式 GB/T 7714	Funk C.,Harrison L.,Alexander L.,et al. Exploring trends in wet-season precipitation and drought indices in wet, humid and dry regions[J],2019,14(11).
APA	Funk C.,Harrison L.,Alexander L.,Peterson P.,Behrangi A.,&Husak G..(2019).Exploring trends in wet-season precipitation and drought indices in wet, humid and dry regions.Environmental Research Letters,14(11).
MLA	Funk C.,et al."Exploring trends in wet-season precipitation and drought indices in wet, humid and dry regions".Environmental Research Letters 14.11(2019).