Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL078312 |
Attributing the US Southwest's Recent Shift Into Drier Conditions | |
Lehner, Flavio1; Deser, Clara1; Simpson, Isla R.1; Terray, Laurent2 | |
2018-06-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
![]() |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:12页码:6251-6261 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; France |
英文摘要 | The U.S. Southwest experienced a strong hydroclimate trend from the 1980s to the 2010s, from cool and wet to warm and dry conditions. Attribution of this trend is challenging due to the influence of internal variability but desired by water managers eager to plan for robust signals of climate change in this water-scarce region. Here we use an empirical method based on constructed circulation analogues to assess the contribution of atmospheric circulation variability to the recent observed hydroclimate trend. Consistent with other studies, we find the observed precipitation trend from 1983 to 2012 to be mainly due to internal atmospheric circulation variability that is driven in part by decadal-scale tropical Pacific sea surface temperature changes. Removing this internal dynamical component brings the observed precipitation trend into closer agreement with the anthropogenically forced response in climate models, demonstrating progress toward an integrated perspective on climate change attribution. Plain Language Summary The U.S. Southwest has been getting drier and warmer over the last few decades. These changes fit the common narrative of what might be expected to happen in response to increasing greenhouse gas concentrations. However, natural variability of precipitation and temperature is known to be large in this region, making it difficult to clearly attribute the recent drying and warming to greenhouse gas forcing. Here we show that while the warming is largely due to greenhouse gas forcing, the drying is mostly due to internal climate variability. To date, only an insignificant drying remains after accounting for this internal climate variability. Unlike previous studies that relied exclusively on climate models, we are able to reach these conclusions based on a combination of observations, an empirical statistical method, and climate models. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000438499100048 |
WOS关键词 | ARCTIC SEA-ICE ; ATMOSPHERIC CIRCULATION RESPONSE ; WESTERN NORTH-AMERICA ; AIR-TEMPERATURE ; UNITED-STATES ; DYNAMICAL ADJUSTMENT ; DROUGHT RISK ; CLIMATE ; MODELS ; TRENDS |
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/26860 |
专题 | 气候变化 |
作者单位 | 1.Natl Ctr Atmospher Res, Climate & Global Dynam Lab, POB 3000, Boulder, CO 80307 USA; 2.Univ Toulouse, CERFACS CNRS, Climate Environm Coupling & Uncertainties Grp, Toulouse, France |
推荐引用方式 GB/T 7714 | Lehner, Flavio,Deser, Clara,Simpson, Isla R.,et al. Attributing the US Southwest's Recent Shift Into Drier Conditions[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(12):6251-6261. |
APA | Lehner, Flavio,Deser, Clara,Simpson, Isla R.,&Terray, Laurent.(2018).Attributing the US Southwest's Recent Shift Into Drier Conditions.GEOPHYSICAL RESEARCH LETTERS,45(12),6251-6261. |
MLA | Lehner, Flavio,et al."Attributing the US Southwest's Recent Shift Into Drier Conditions".GEOPHYSICAL RESEARCH LETTERS 45.12(2018):6251-6261. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论