【摘 要】
：
使用四川、重庆、贵州1951年至2008年地面气象观测站网监测的日雨量资料,分析四川盆地内(27°N～32°N,105° E～11O°E)54站日雨量,统计分析表明：宜宾、重庆西部到南充是大范围大暴雨的多发区,着重研究西南低涡引发这一地区暴雨,先在常规天气图上分析主要影响天气系统,再用NCEP/NCAR 1 °×1°的再分析资料结合实测气象观测,对2007年到2010年发生的6次暴雨天气过程,进行
【机 构】
：
重庆市气象台,重庆,401147 重庆市气象科学研究所,重庆,401147
【出 处】
：
青藏高原与邻近地区天气气候及其全球影响学术研讨会
论文部分内容阅读
使用四川、重庆、贵州1951年至2008年地面气象观测站网监测的日雨量资料,分析四川盆地内(27°N～32°N,105° E～11O°E)54站日雨量,统计分析表明：宜宾、重庆西部到南充是大范围大暴雨的多发区,着重研究西南低涡引发这一地区暴雨,先在常规天气图上分析主要影响天气系统,再用NCEP/NCAR 1 °×1°的再分析资料结合实测气象观测,对2007年到2010年发生的6次暴雨天气过程,进行了合成分析。合成分析表明：200hPa高空急流形成与暴雨的发生基本同步,伴随西南低涡的发展在200hPa有明显的增暖现象；500hPa低槽东移,槽前正涡度加强,从对流层底垂直伸展到300hPa以上,正涡度中心随高度有较明显倾斜；850hPa低层偏北大风区与偏南大风区在105～107° E、28～30°N之间交汇(交汇区与暴雨落区基本重合),对流层低到大气边界层从东南向西北水汽输送显著,暴雨发生前大气对流性不稳定明显。最后给出2010年6月19～20日长江流域大范围暴雨个例简析。
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