DOI: 10.1002/2017MS001082
Scopus记录号: 2-s2.0-85034263602
论文题名: Improved Winter European Atmospheric Blocking Frequencies in High-Resolution Global Climate Simulations
作者: Davini P ; , Corti S ; , D'Andrea F ; , Rivière G ; , von Hardenberg J
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 7 起始页码: 2615
结束页码: 2634
语种: 英语
英文关键词: Mechanical waves
; Blocking
; GCMs
; Global climate simulations
; High resolution
; Horizontal resolution
; Meridional temperature gradient
; Northern Hemispheres
; Tropical precipitation
; Earth atmosphere
; atmospheric blocking
; baroclinic mode
; breaking wave
; climate modeling
; general circulation model
; global climate
; jet stream
; meridional circulation
; Northern Hemisphere
; numerical model
; orography
; planetary wave
; precipitation (climatology)
; Rossby wave
; temperature gradient
; troposphere
; winter
; zonal wind
; Atlantic Ocean
; Europe
英文摘要: The numerical simulation of atmospheric blocking, in particular over the Euro-Atlantic region, still represents a main concern for the climate modeling community. We discuss the Northern Hemisphere winter atmospheric blocking representation in a set of 30 year atmosphere-only simulations using the EC-Earth Earth System Model with several ensemble members at five different horizontal resolutions (from 125 to 16 km). Results show that the negative bias in blocking frequency over Europe becomes negligible at resolutions of about 40 and 25 km. A combined effect by the more resolved orography and by a change in tropical precipitation is identified as the source of an upper tropospheric planetary wave. At the same time, a weakening of the meridional temperature gradient reduces the upper level baroclinicity and the zonal mean winds. Following these changes, in the high-resolution configurations the Atlantic eddy-driven jet stream is weakened favoring the breaking of synoptic Rossby waves over the Atlantic ridge and thus increasing the simulated European blocking frequency. However, at high-resolution the Atlantic jet stream is too weak and the blocking duration is still underestimated. This suggests that the optimal blocking frequencies are achieved through compensation of errors between eddies found at upper levels (too strong) and eddies at lower levels (too weak). This also implies that eddies are not necessarily better represented at higher resolutions. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75715
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Laboratoire de Météorologie Dynamique/IPSL, École Normale Supérieure, PSL Research University, CNRS, Paris, France; Istituto di Scienze dell'Atmosfera e del Clima, Consiglio Nazionale delle Ricerche (ISAC-CNR), Torino, Italy; Istituto di Scienze dell'Atmosfera e del Clima, Consiglio Nazionale delle Ricerche (ISAC-CNR), Bologna, Italy
Recommended Citation:
Davini P,, Corti S,, D'Andrea F,et al. Improved Winter European Atmospheric Blocking Frequencies in High-Resolution Global Climate Simulations[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(7)