The parametrization of rainfall interception in GCMs
The parametrization of rainfall interception in GCMs
复制标题
GCM 中降雨拦截的参数化
DOI：
10.1002/qj.49711850504
复制
发表时间：
1992
影响因子：
8.9
通讯作者：
D. Gregory
中科院分区：
文献类型：
--
作者：
A. Dolman;D. Gregory
使用气象局11层GCM的一维版本进行实验，得出亚马逊雨林降雨拦截的简单校准子网格参数化。本文提出并测试了两个拦截参数，它们都包含了GCM网格框内降水的子网格变率，并与单个地点的观测结果进行了比较。1-D模式是一个完全交互的大气柱，包含了所有的GCM物理，但在其边界受到气候数据的强迫。拦截损失似乎对GCM网格框中有多少面积被雨覆盖以及拦截过程的精确公式很敏感。讨论了GCM网格中湿区参数化的意义，并对如何参数化GCM网格中湿区比例提出了建议。
Experiments with a one-dimensional version of the Meteorological Office's 11-layer GCM are used to derive a simple calibrated subgrid parametrization of rainfall interception by the Amazonian rain forest. Two interception parametrizations, both incorporating subgrid variability of precipitation within a GCM grid box are presented and tested, and compared with observations made at a single location. the 1-D model is a fully interactive atmospheric column and incorporates all the GCM physics but is forced at its boundaries by climatic data. the interception losses appear to be sensitive to what fraction of area in the GCM grid box is covered by the rain and to the precise formulation of the interception process. the implications for the parametrization of the wet area in a GCM grid box are discussed and suggestions are made as to how to parametrize the fraction of wetted area in a GCM grid box.