DOI: 10.1002/2014GL060764
论文题名: Responses of midlatitude blocks and wave amplitude to changes in the meridional temperature gradient in an idealized dry GCM
作者: Hassanzadeh P. ; Kuang Z. ; Farrell B.F.
刊名: Geophysical Research Letters
ISSN: 0094-9920
EISSN: 1944-9651
出版年: 2014
卷: 41, 期: 14 起始页码: 5223
结束页码: 5232
语种: 英语
英文关键词: Arctic amplification
; blocking
; extreme weather
; midlatitude weather
; wave amplitude
Scopus关键词: Earth sciences
; Geophysics
; blocking
; Extreme weather
; Extreme weather events
; General circulation model
; Meridional temperature gradient
; Midlatitudes
; Near surface temperature
; Wave amplitudes
; Atmospheric temperature
; amplitude
; general circulation model
; jet flow
; meridional circulation
; midlatitude environment
; temperature effect
; wave field
; wave height
; zonal wind
; Arctic Ocean
英文摘要: The response of atmospheric blocks and the wave amplitude of midlatitude jets to changes in the midlatitude to pole, near-surface temperature difference (ΔT), is studied using an idealized dry general circulation model (GCM) with Held-Suarez forcing. Decreasing ΔT results in slower zonal winds, a mean state with reduced meridional gradient of the 500 hPa geopotential height (Z500), a smaller variance of Z500 anomalies, and a robust decrease in blocks and meridional amplitude of waves. Neglecting the decrease of variance associated with reduced ΔT would lead to the incorrect expectation that mean states with smaller Z500 gradients produce more blocks and higher wave amplitudes. Our results suggest further investigation of the hypothesis that reduced ΔT due to Arctic Amplification would increase blocking events and wave amplitude, hence leading to more midlatitude extreme weather events. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84904532905&doi=10.1002%2f2014GL060764&partnerID=40&md5=dda513bebbb1d7bc13abd16b899b44f9
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7184
Appears in Collections: 气候减缓与适应
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作者单位: Center for the Environment, Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States
Recommended Citation:
Hassanzadeh P.,Kuang Z.,Farrell B.F.. Responses of midlatitude blocks and wave amplitude to changes in the meridional temperature gradient in an idealized dry GCM[J]. Geophysical Research Letters,2014-01-01,41(14).