| DOI: | 10.1002/2017JD027577
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| Scopus记录号: | 2-s2.0-85045195406
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| 论文题名: | Drought Persistence Errors in Global Climate Models |
| 作者: | Moon H.; Gudmundsson L.; Seneviratne S.I.
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| 刊名: | Journal of Geophysical Research: Atmospheres
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| ISSN: | 2169897X
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| 出版年: | 2018
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| 卷: | 123, 期:7 | | 起始页码: | 3483
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| 结束页码: | 3496
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| 语种: | 英语
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| 英文关键词: | climate models
; drought
; drought length bias
; drought persistence
; drought persistence bias
; uncertainty
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| Scopus关键词: | climate change
; climate modeling
; data set
; drought
; error analysis
; global climate
; persistence
; precipitation (climatology)
; simulation
; uncertainty analysis
; variance analysis
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| 英文摘要: | The persistence of drought events largely determines the severity of socioeconomic and ecological impacts, but the capability of current global climate models (GCMs) to simulate such events is subject to large uncertainties. In this study, the representation of drought persistence in GCMs is assessed by comparing state-of-the-art GCM model simulations to observation-based data sets. For doing so, we consider dry-to-dry transition probabilities at monthly and annual scales as estimates for drought persistence, where a dry status is defined as negative precipitation anomaly. Though there is a substantial spread in the drought persistence bias, most of the simulations show systematic underestimation of drought persistence at global scale. Subsequently, we analyzed to which degree (i) inaccurate observations, (ii) differences among models, (iii) internal climate variability, and (iv) uncertainty of the employed statistical methods contribute to the spread in drought persistence errors using an analysis of variance approach. The results show that at monthly scale, model uncertainty and observational uncertainty dominate, while the contribution from internal variability is small in most cases. At annual scale, the spread of the drought persistence error is dominated by the statistical estimation error of drought persistence, indicating that the partitioning of the error is impaired by the limited number of considered time steps. These findings reveal systematic errors in the representation of drought persistence in current GCMs and suggest directions for further model improvement. ©2018. The Authors. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/114079
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland
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| Recommended Citation: | |
Moon H.,Gudmundsson L.,Seneviratne S.I.. Drought Persistence Errors in Global Climate Models[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(7)
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