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DOI | 10.1029/2018GL079102 |
Evaluating the Contribution of Land-Atmosphere Coupling to Heat Extremes in CMIP5 Models | |
Ukkola, A. M.1,2; Pitman, A. J.2; Donat, M. G.3; De Kauwe, M. G.2; Angelil, O.3 | |
2018-09-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:17页码:9003-9012 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia |
英文摘要 | Land-atmosphere coupling can amplify heat extremes under declining soil moisture. Here we evaluate this coupling in 25 Coupled Model Intercomparison Project Phase 5 models using flux tower observations over Europe and North America. We compared heat extremes (2.5% of the hottest days of the year) and the evaporative fraction (EF; a measure of land surface dryness) on the day the heat extremes occurred. We found a negative relationship between the magnitude of heat extremes and EF in both models and observations in transitional regions, with the hottest temperatures occurring during the driest days, with a similar but less certain relationship in dry regions. Surprisingly, many models also showed an amplification of heat extremes by low EF in wet regions, a finding not supported by observations. Many models may therefore overamplify heat extremes over wet regions by overestimating the strength of land-atmosphere coupling, with consequences for future projections of heat extremes. Plain Language Summary Hot days are expected to become more frequent with climate change. Heat extremes can be exacerbated by dry conditions due to a lack of evaporative cooling. This has been shown to be an important mechanism for future amplification of heat extremes in several regions. We evaluated how well global climate models can simulate these interactions between hot and dry conditions under current climate conditions. We showed that many models overestimate this interaction in wet regions and consequently overamplify heat extremes. Our study points to an area of necessary model improvement to increase confidence in future projections of heat extremes. |
英文关键词 | heat extremes land-atmosphere coupling CMIP5 Fluxnet |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000445727500034 |
WOS关键词 | SOIL-MOISTURE ; STOMATAL CONDUCTANCE ; EUROPEAN FOREST ; HOT EXTREMES ; GLOBAL-SCALE ; CLIMATE ; IMPACT ; EVAPOTRANSPIRATION ; FLUXES ; PRECIPITATION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/28740 |
专题 | 气候变化 |
作者单位 | 1.Australian Natl Univ, ARC Ctr Excellence Climate Extremes, Canberra, ACT, Australia; 2.Univ New South Wales, ARC Ctr Excellence Climate Extremes, Sydney, NSW, Australia; 3.Univ New South Wales, Climate Change Res Ctr, Sydney, NSW, Australia |
推荐引用方式 GB/T 7714 | Ukkola, A. M.,Pitman, A. J.,Donat, M. G.,et al. Evaluating the Contribution of Land-Atmosphere Coupling to Heat Extremes in CMIP5 Models[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(17):9003-9012. |
APA | Ukkola, A. M.,Pitman, A. J.,Donat, M. G.,De Kauwe, M. G.,&Angelil, O..(2018).Evaluating the Contribution of Land-Atmosphere Coupling to Heat Extremes in CMIP5 Models.GEOPHYSICAL RESEARCH LETTERS,45(17),9003-9012. |
MLA | Ukkola, A. M.,et al."Evaluating the Contribution of Land-Atmosphere Coupling to Heat Extremes in CMIP5 Models".GEOPHYSICAL RESEARCH LETTERS 45.17(2018):9003-9012. |
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