气候变化领域集成服务门户(CCPortal): Trends in northern midlatitude atmospheric wave power from 1950 to 2099

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DOI	10.1007/s00382-020-05143-3
	Trends in northern midlatitude atmospheric wave power from 1950 to 2099
	Sussman H.S.; Raghavendra A.; Roundy P.E.; Dai A.
发表日期	2020
ISSN	0930-7575
起始页码	2903
结束页码	2918
卷号	54
英文摘要	In a warming climate, atmospheric wave activity and associated weather patterns may change, although conflicting results have been reported on this topic. Additionally, atmospheric wave changes in a future climate have mainly focused on waves of a specified spatial scale, rather than a particular spatiotemporal scale. Here, changes in the variability of Rossby waves of multiple spatiotemporal scales are analyzed using the wavenumber-frequency power spectrum, a tool commonly applied to analyze atmospheric equatorial waves. Daily 500 hPa geopotential height data over 40°–60°N from historical (1950–2005) and future (2006–2099) simulations from 20 models in the Coupled Model Intercomparison Project Phase 5 (CMIP5) under the RCP8.5 scenario were analyzed. When compared to the historical period, the late 21st century climate projections showed a decline in spectral power for both eastward and westward propagating waves with wavenumbers greater than 8 that spanned over all frequencies in all seasons, but an increase in mean power for eastward propagating waves with wavenumbers 1–7 over all frequencies was shown in winter and spring. This increase in power was accompanied by increased variance, i.e., an increased meridional extent of 500 hPa ridges and troughs, and was the result of increases in the mean number of high amplitude events and duration of activity within this wave band. These results indicate that large-scale (~ 104 km) eastward propagating weather systems may intensify with higher amplitudes for ridges and troughs, while short-scale (102–103 km) weather systems may decrease in their intensity due to reduced variability in the late 21st century under the high emissions scenario. Potential mechanisms for these changes are discussed, including enhanced Arctic warming and midlatitude-tropical interactions. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Climate change; CMIP5; Rossby waves; Spectral analysis; Wavenumber-frequency power spectrum
语种	英语
scopus关键词	CMIP; equatorial wave; global warming; midlatitude environment; Rossby wave; spatiotemporal analysis; spectral analysis; trend analysis; wave power; Arctic
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145560
作者单位	Department of Atmospheric and Environmental Sciences, State University of New York, University at Albany, Earth Sciences Bldg., 1400 Washington Ave., Albany, NY 12222, United States
推荐引用方式 GB/T 7714	Sussman H.S.,Raghavendra A.,Roundy P.E.,et al. Trends in northern midlatitude atmospheric wave power from 1950 to 2099[J],2020,54.
APA	Sussman H.S.,Raghavendra A.,Roundy P.E.,&Dai A..(2020).Trends in northern midlatitude atmospheric wave power from 1950 to 2099.Climate Dynamics,54.
MLA	Sussman H.S.,et al."Trends in northern midlatitude atmospheric wave power from 1950 to 2099".Climate Dynamics 54(2020).