气候变化领域集成服务门户(CCPortal): Sensitivity of Atmospheric River Vapor Transport and Precipitation to Uniform Sea Surface Temperature Increases

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DOI	10.1029/2020JD033421
	Sensitivity of Atmospheric River Vapor Transport and Precipitation to Uniform Sea Surface Temperature Increases
	McClenny E.E.; Ullrich P.A.; Grotjahn R.
发表日期	2020
ISSN	2169897X
卷号	125 期号:21
英文摘要	Filaments of intense vapor transport called atmospheric rivers (ARs) are responsible for the majority of poleward vapor transport in the midlatitudes. Despite their importance to the hydrologic cycle, there remain many unanswered questions about changes to ARs in a warming climate. In this study we perform a series of escalating uniform SST increases (+2, +4, and +6K, respectively) in the Community Atmosphere Model version 5 in an aquaplanet configuration to evaluate the thermodynamic and dynamical response of AR vapor content, transport, and precipitation to warming SSTs. We find that AR column integrated water vapor (IWV) is especially sensitive to SST and increases by 6.3–9.7% per degree warming despite decreasing relative humidity through much of the column. Further analysis provides a more nuanced view of AR IWV changes: Since SST warming is modest compared to that in the midtroposphere, computing fractional changes in IWV with respect to SST results in finding spuriously large increases. Meanwhile, results here show that AR IWV transport increases relatively uniformly with temperature and at consistently lower rates than IWV, as modulated by systematically decreasing low-level wind speeds. Similarly, changes in AR precipitation are related to a compensatory relationship between enhanced near-surface moisture and damped vertical motions. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	aquaplanet; atmospheric rivers; attribution; CC scaling; sensitivity
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185669
作者单位	Atmospheric Science, University of California, Davis, Davis, CA, United States
推荐引用方式 GB/T 7714	McClenny E.E.,Ullrich P.A.,Grotjahn R.. Sensitivity of Atmospheric River Vapor Transport and Precipitation to Uniform Sea Surface Temperature Increases[J],2020,125(21).
APA	McClenny E.E.,Ullrich P.A.,&Grotjahn R..(2020).Sensitivity of Atmospheric River Vapor Transport and Precipitation to Uniform Sea Surface Temperature Increases.Journal of Geophysical Research: Atmospheres,125(21).
MLA	McClenny E.E.,et al."Sensitivity of Atmospheric River Vapor Transport and Precipitation to Uniform Sea Surface Temperature Increases".Journal of Geophysical Research: Atmospheres 125.21(2020).