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DOI: 10.1002/joc.6029
Scopus ID: 2-s2.0-85061909480
Title:
Climatological influence of Eurasian winter surface conditions on the Asian and Indo-Pacific summer circulation in the NCEP CFSv2 seasonal reforecasts
Author: Shukla R.P.; Huang B.; Dirmeyer P.A.; Kinter J.L.; Shin C.-S.; Marx L.
Source Publication: International Journal of Climatology
ISSN: 8998418
Indexed By: SCI ; SCI-E ; EI
Publishing Year: 2019
Language: 英语
Keyword: atmospheric circulation ; Eurasian snow ; NCEP CFSv2 ; seasonal reforecasts ; surface energy budget
Scopus Keyword: Budget control ; Solar radiation ; Troposphere ; Atmospheric circulation ; Eurasian snows ; NCEP CFSv2 ; Reforecasts ; Surface energy budget ; Snow
English Abstract: This study evaluates the possible influence of the winter surface conditions in Eurasia on the summer circulation over the Asian continent and Indo-Pacific region. We have analysed multi-seasonal ensemble reforecasts for 30 years (1979–2008) using the National Centers for Environmental Prediction Climate Forecast System version 2 initialized at the beginning of each month from January to May. It is found that the reforecasts initialized in winter (e.g., February) overestimate the snow cover fraction, depth and water equivalent, as well as surface albedo in the excessively snow-covered portion of Eurasia from March to June. These biases are generated and perpetuated by a snow-albedo feedback, leading to excessive upwards shortwave radiation reflected from the overly snow-covered surface and an intense cold bias from the surface to mid-troposphere. Originating over land, the cold bias is extended eastwards over the northwestern North Pacific by the advection of prevailing westerly winds. The cold air temperature in the broad mid-latitude Asian-Pacific region causes significantly lower geopotential heights at pressure levels in the middle and upper troposphere and thus increases the upper-level westerly winds on its southern flank over the Asian continent and Indo-Pacific. A slower than observed snow melting rate helps the winter cold bias persists well into the summer season in these runs. As a result, compared with the reforecasts initialized in spring (e.g., May), winter-initialized reforecasts feature lower geopotential heights in the upper troposphere over Eurasia and a stronger subtropical jet over the Asian continent and the North Pacific from May to September, especially in early summer. The CFSv2 reforecasts in both sets of cases have too little total cloud fraction over Eurasia during June–August, leading to enhanced downwards shortwave radiation. © 2019 Royal Meteorological Society
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Document Type: 期刊论文
Identifier: http://119.78.100.177/globalchange/handle/2HF3EXSE/116613
Appears in Collections:全球变化的国际研究计划

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Affiliation: Center for Ocean-Land-Atmosphere Studies, George Mason University, Fairfax, VA, United States; Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, VA, United States

Recommended Citation:
Shukla R.P.,Huang B.,Dirmeyer P.A.,et al. Climatological influence of Eurasian winter surface conditions on the Asian and Indo-Pacific summer circulation in the NCEP CFSv2 seasonal reforecasts[J]. International Journal of Climatology,2019-01-01
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