DOI: 10.1175/JCLI-D-15-0781.1
Scopus记录号: 2-s2.0-84966271211
论文题名: Full access how stationary eddies shape changes in the hydrological cycle: Zonally asymmetric experiments in an idealized GCM
作者: Wills R.C. ; Schneider T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 9 起始页码: 3161
结束页码: 3179
语种: 英语
Scopus关键词: Atmospheric humidity
; Global warming
; Mechanical waves
; Atmospheric moisture content
; Extratropical storms
; Hydrologic cycles
; Hydrological cycles
; Overturning circulation
; Planetary Waves
; Specific humidity
; Stationary waves
; Tropics
; atmospheric general circulation model
; atmospheric moisture
; eddy
; hydrological cycle
; moisture content
; planetary wave
; Rossby wave
; standing wave
英文摘要: Stationary and low-frequency Rossby waves are the primary drivers of extratropical weather variations on monthly and longer time scales. They take the form of persistent highs and lows, which, for example, shape subtropical dry zones and guide extratropical storms. More generally, stationary-eddy circulations, including zonally anomalous tropical overturning circulations, set up large zonal variations in net precipitation (precipitation minus evaporation, P - E). This paper investigates the response of stationary eddies and the zonally asymmetric hydrological cycle to global warming in an idealized GCM, simulating a wide range of climates by varying longwave absorption. The stationary eddies are forced by two idealized zonal asymmetries: A midlatitude Gaussian mountain and an equatorial ocean heat source. Associated with changes in stationary eddies are changes in the zonal variation of the hydrological cycle. Particularly in the subtropics, these simulations show a nearly constant or decreasing amplitude of the zonally anomalous hydrological cycle in climates warmer than modern despite the wet gets wetter, dry gets drier effect associated with increasing atmospheric moisture content. An approximation for zonally anomalous P - E, based on zonal-mean surface specific humidity and stationary-eddy vertical motion, disentangles the roles of thermodynamic and dynamic changes. The approximation shows that changes in the zonally asymmetric hydrological cycle are predominantly controlled by changes in lower-tropospheric vertical motion in stationary eddies. © 2016 American Meteorological Society. 资助项目: NSF, Norsk Sykepleierforbund
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49959
Appears in Collections: 气候变化事实与影响
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作者单位: California Institute of Technology, Pasadena, CA, United States; ETH Zürich, Zurich, Switzerland
Recommended Citation:
Wills R.C.,Schneider T.. Full access how stationary eddies shape changes in the hydrological cycle: Zonally asymmetric experiments in an idealized GCM[J]. Journal of Climate,2016-01-01,29(9)