globalchange  > 气候变化事实与影响
DOI: 10.1175/JCLI-D-12-00461.1
Scopus记录号: 2-s2.0-84884258352
论文题名:
Extratropical summertime response to tropical interannual variability in an idealized GCM
作者: Hall N.M.J.; Douville H.; Li L.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期:18
起始页码: 7060
结束页码: 7079
语种: 英语
Scopus关键词: European centre for medium-range weather forecasts ; Extratropical latitudes ; General circulation model simulations ; Interannual variability ; Linear wave propagation ; National centers for environmental predictions ; Primitive equations ; West African Monsoon ; Climate change ; Wave propagation ; Weather forecasting ; Tropics ; annual variation ; anomaly ; atmospheric circulation ; climatology ; equation ; extratropical environment ; general circulation model ; jet stream ; monsoon ; numerical model ; summer ; wave propagation ; weather forecasting ; Asia ; Central America ; Europe ; North America ; West Africa
英文摘要: A primitive equation model is used to investigate the role of the tropics in generating seasonal-mean anomalies in the extratropics. A nudging technique is applied to guide selected tropical regions toward 40-yr European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA-40) and the National Centers for Environmental Prediction (NCEP)/Department of Energy Reanalysis (NCEP-2). The timeindependent linear response to these tropical anomalies is calculated for extratropical basic states taken from reanalysis climatologies and also from the climatological states of Action de Recherche Petite Echelle Grande Echelle (ARPEGE) and Laboratoire de Météorologie Dynamique (LMDZ) general circulation model simulations. For summer case studies, time-independent linear solutions show that some seasonal anomalies can be attributed to linear wave propagation from the tropics, especially for lower extratropical latitudes. If nudging is applied to the anomaly part of the tropical flow, the linear response shows little dependence on the basic state. Regional tropical nudging experiments display a global extratropical response. The persistent European summer anomaly in 2003 is partly attributable to a linear response to both Central American and West African monsoon circulations. The African region also triggers a wave train along the Asian subtropical jet. The model is then used in "simple GCM" mode to obtain extratropical responses that include a contribution from transient eddies. Tropical nudging improves the simple GCM's stationary wave climatology, and transient eddy forcing can produce substantial seasonal anomalies at high latitudes with better correspondence to some observed cases, especially in the Western Hemisphere, with stronger communication between the Asian monsoon and North America. © 2013 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51674
Appears in Collections:气候变化事实与影响

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作者单位: LEGOS/CNRS-IRD-CNES, University of Toulouse, Nicholas Hall, LEGOS, 14 Ave. Edouard Belin, 31400 Toulouse, France; Météo-France/CNRM, Toulouse, France; LMD/CNRS, Paris, France

Recommended Citation:
Hall N.M.J.,Douville H.,Li L.. Extratropical summertime response to tropical interannual variability in an idealized GCM[J]. Journal of Climate,2013-01-01,26(18)
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