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| DOI | 10.1029/2019JD031946 |
| Uncertainties in Drought From Index and Data Selection | |
| Hoffmann D.; Gallant A.J.E.; Arblaster J.M. | |
| 发表日期 | 2020 |
| ISSN | 2169897X |
| 卷号 | 125期号:18 |
| 英文摘要 | This study compares various drought indices, the Palmer Drought Severity Index (PDSI), the Standardized Precipitation Evapotranspiration Index (SPEI), and the Standardized Precipitation Index (SPI), and the uncertainties in each to the input data from which they are derived. The abilities of the PDSI, SPEI, and SPI to capture drought periods are assessed through a comparison with soil moisture estimates from two generations of the Global Land Data Assimilation System (GLDAS). This comparison shows that the skill with which a drought index represents variations in soil moisture does not necessarily improve when evapotranspiration is included (i.e., PDSI/SPEI rather than SPI), though this depends on location and the time scale of the drought. The differences in the abilities of the drought indices to represent soil moisture are also compared to the magnitude of the uncertainty in each index arising from the choice of input data. In many cases, the uncertainties in the variations of the PDSI, SPEI, and SPI to the choice of input data are larger in magnitude than the differences between the indices themselves, particularly when considering the dry tails of the distribution. The results show that no one drought index outperforms the others during drought conditions. ©2020. American Geophysical Union. All Rights Reserved. |
| 英文关键词 | agricultural drought; drought indices; GLDAS; meteorological drought; PDSI; SPI |
| 语种 | 英语 |
| 来源期刊 | Journal of Geophysical Research: Atmospheres
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/185766 |
| 作者单位 | School of Earth, Atmosphere and Environment, Monash University, Monash, VIC, Australia; Australian Research Council Centre of Excellence for Climate Extremes, Monash, VIC, Australia; National Center for Atmospheric Research, Boulder, CO, United States |
| 推荐引用方式 GB/T 7714 | Hoffmann D.,Gallant A.J.E.,Arblaster J.M.. Uncertainties in Drought From Index and Data Selection[J],2020,125(18). |
| APA | Hoffmann D.,Gallant A.J.E.,&Arblaster J.M..(2020).Uncertainties in Drought From Index and Data Selection.Journal of Geophysical Research: Atmospheres,125(18). |
| MLA | Hoffmann D.,et al."Uncertainties in Drought From Index and Data Selection".Journal of Geophysical Research: Atmospheres 125.18(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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