【摘 要】
：
本文利用7年的ISCCP资料,JRA再分析资料和TRMM3B42降水资料,对高原内部对流系统(CS)的生成源地、分类、环境场的高低空水平特征、垂直特征和地面降水特征进行了合成分析,探讨了CS移出高原及不能移出高原的原因,分析了CS向东或向南移出高原的机制,主要结论如下：高原内部各类CS动热力结构特征基本一致,低空辐合正涡旋,高空辐散负涡旋,CS控制区高低空湿度大,云水含量高,温度露点差低,CS中心
【机 构】
：
中国气象局国家卫星气象中心,北京,100081;中国科学院大气物理研究所,北京,100029 中国
【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
本文利用7年的ISCCP资料,JRA再分析资料和TRMM3B42降水资料,对高原内部对流系统(CS)的生成源地、分类、环境场的高低空水平特征、垂直特征和地面降水特征进行了合成分析,探讨了CS移出高原及不能移出高原的原因,分析了CS向东或向南移出高原的机制,主要结论如下：高原内部各类CS动热力结构特征基本一致,低空辐合正涡旋,高空辐散负涡旋,CS控制区高低空湿度大,云水含量高,温度露点差低,CS中心上空存在明显的上升运动。南移CS强度最强,东移CS其次,没有移出高原CS最弱。高原CS对东亚地区降水具有重要贡献,尤其是对强降水的贡献更大。高原内部CS地面平均降水中心都位于CS偏东地区,南移CS的平均地面降水率最大,东移CS其次,没有移出高原的CS地面降水率最小。高空北风气流对CS的维持发展具有重要作用,高空北风气流强,利于高位涡冷空气南下,南北气流汇合强,对流不稳定得到发展,利于CS维持发展。涡度对CS强度具有一定指示作用。决定CS向东或向南移出高原的原因是环境动力因素,东移CS在强的西风气流控制下向东移出高原,南移CS西风气流弱且北风气流强,使得CS向南移出高原,而没有移出高原的CS西风不够强,也没有北风气流,无法移出高原。
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