Convective and stratiform components of the precipitation-moisture relationship
Convective and stratiform components of the precipitation-moisture relationship
复制标题
DOI：
10.1002/2015gl066957
复制
发表时间：
2015-12-16
影响因子：
5.2
通讯作者：
Schumacher, Courtney
中科院分区：
文献类型：
--
作者：
Ahmed, Fiaz;Schumacher, Courtney
利用地面雷达和卫星观测，我们重新检验了著名的区域平均地面降水量（P）和柱含水量（r）之间的经验关系，重点是对流和层状降水的分类。P在临界r（r（c））以上的快速上升或“拾取”对于每小时和更短时间尺度上的层状降雨更为明显，而对流降雨在r（c）以上仅显示弱拾取。将区域平均降雨量划分为条件雨率和雨面积后，我们发现P-r曲线的非线性几乎完全可以用雨面积的非线性增加来解释，尤其是在层状区域。这些发现对全球环流模式中有组织的对流云系统的表示有影响。
We reexamine the well known empirical relationship between area-averaged surface precipitation (P) and the columnmoisture content (r) using ground radar and satellite observations, with an emphasis on the convective and stratiform rainfall classifications. The rapid rise in P above critical r (r(c)) or the "pickup" is more pronounced for stratiform rainfall on hourly and less time scales while convective rainfall, displays only a weak pickup above r(c). After partitioning the area-averaged rainfall into conditional rain rates and rain area, we find that the nonlinearity in the P-r curve can be almost entirely explained by the nonlinear increase in rain area, especially in stratiform regions. These findings have implications for the representation of organized convective cloud systems in global circulation models.