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      氣候變化研究進(jìn)展 ?? 2009, Vol. 5 ?? Issue (04): 196-201.

      ? 氣候變化與冰凍圈專(zhuān)欄 ? 上一篇    下一篇

      春季歐亞積雪異常影響中國夏季降水的數值試驗

      李震坤1,武炳義2,朱偉軍2   

      1. 1. 南京信息工程大學(xué)大氣科學(xué)學(xué)院;中國氣象科學(xué)研究院氣候系統研究所2. 中國氣象科學(xué)研究院
      • 收稿日期:2008-08-25 修回日期:2008-10-14 出版日期:2009-07-30 發(fā)布日期:2009-07-30
      • 通訊作者: 李震坤

      Numerical Simulation on Effect of Spring Eurasian Snow Cover on Summer Rainfall in China

      LI Zhen-Kun   

      • Received:2008-08-25 Revised:2008-10-14 Online:2009-07-30 Published:2009-07-30
      • Contact: LI Zhen-Kun

      摘要: 利用NCAR的新一代GCM CAM3.1版本模式,研究了歐亞大陸春季積雪異常對北半球大氣環(huán)流和中國夏季降水的影響。結果表明,春季積雪異常通過(guò)改變其后夏季的土壤濕度和溫度分布,造成對流層厚度場(chǎng)的異常,激發(fā)一個(gè)從歐洲西部到東亞的500 hPa高度場(chǎng)異常波列。我國南、北方處于符號相反的高度場(chǎng)異常區,同時(shí)降水也呈現南北相異的態(tài)勢,這表明春季歐亞積雪異常是影響我國夏季降水分布的一個(gè)重要因子。

      關(guān)鍵詞: 歐亞積雪, 中國夏季降水, 數值模擬, 大氣環(huán)流

      Abstract: The effects of spring Eurasian snow cover on Northern Hemispheric atmospheric circulation and summer rainfall in China have been explored using the latest version of general circulation model (GCM) CAM3.1 developed by NCAR. Model results show that snow anomaly in spring can cause the thickness anomaly in the troposphere and trigger a wave train of geopotential height anomalies from western Europe extending to East Asia at 500 hPa by changing the distribution of the soil moisture and temperature in succeeding summer. As a result, 500 hPa height anomalies with opposite sign are located in southern and northern China. Meanwhile, summer precipitation anomaly in southern China is out of phase with that in northern China. The results demonstrate that spring Eurasian snow cover anomaly acts as an important factor affecting the distribution of summer rainfall in China.

      Key words: Eurasian snow cover, summer rainfall in China, numerical simulation, atmospheric circulation

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