Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1088/1748-9326/ab4a6c |
Exploring trends in wet-season precipitation and drought indices in wet, humid and dry regions | |
Funk, Chris1,2; Harrison, Laura2; Alexander, Lisa3,4; Peterson, Pete2; Behrangi, Ali5; Husak, Greg2 | |
2019-11-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS |
ISSN | 1748-9326 |
出版年 | 2019 |
卷号 | 14期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Australia |
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. |
英文关键词 | precipitation precipitation extremes climate change drought evapotranspiration global warming satellite precipitation |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000494486100001 |
WOS关键词 | EVAPORATIVE DEMAND ; CLIMATE ; SATELLITE ; RESPONSES ; CO2 |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/224666 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.US Geol Survey, Earth Resources Observat & Sci Ctr, 959 Natl Ctr, Reston, VA 22092 USA; 2.UC Santa Barbara Climate Hazards Ctr, Santa Barbara, CA 93106 USA; 3.UNSW Sydney, Climate Change Res Ctr, Sydney, NSW, Australia; 4.UNSW Sydney, ARC Ctr Excellence Climate Extremes, Sydney, NSW, Australia; 5.Univ Arizona, Dept Hydrol & Atmospher Sci, Tucson, AZ 85721 USA |
推荐引用方式 GB/T 7714 | Funk, Chris,Harrison, Laura,Alexander, Lisa,et al. Exploring trends in wet-season precipitation and drought indices in wet, humid and dry regions[J]. ENVIRONMENTAL RESEARCH LETTERS,2019,14(11). |
APA | Funk, Chris,Harrison, Laura,Alexander, Lisa,Peterson, Pete,Behrangi, Ali,&Husak, Greg.(2019).Exploring trends in wet-season precipitation and drought indices in wet, humid and dry regions.ENVIRONMENTAL RESEARCH LETTERS,14(11). |
MLA | Funk, Chris,et al."Exploring trends in wet-season precipitation and drought indices in wet, humid and dry regions".ENVIRONMENTAL RESEARCH LETTERS 14.11(2019). |
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