A limited‐area‐model case study of the effects of sub‐grid scale Variations in relative humidity and cloud upon the direct radiative forcing of sulfate aerosol
A limited‐area‐model case study of the effects of sub‐grid scale Variations in relative humidity and cloud upon the direct radiative forcing of sulfate aerosol
复制标题
亚网格尺度变化和云对硫酸盐气溶胶直接辐射强迫影响的有限区域模型案例研究
DOI：
10.1029/96gl03812
复制
发表时间：
2007
影响因子：
5.2
通讯作者：
L. Donner
中科院分区：
文献类型：
--
作者：
J. Haywood;V. Ramaswamy;L. Donner
一个水平空间分辨率为2km × 2km的有限区域非流体静力模式被用于评估相对湿度和云的亚网格尺度变化对对流层硫酸盐气溶胶直接辐射强迫（DRF）的重要性。对晴空和多云区域的有限区域模型的DRF进行了分析，并将结果与在粗水平网格上使用一般环流模型（GCM）参数化计算得到的结果进行了比较。在这个理想化的模式研究中，GCM计算低估了晴空DRF约73%，多云天空DRF约60%。这些结果表明，在相对湿度高、相对湿度和云量空间变异性较大的地区，GCM计算可能大大低估了DRF。
A limited‐area non‐hydrostatic model with a horizontal spatial resolution of 2km by 2km is used to assess the importance of sub‐grid scale variations in relative humidity and cloud upon the direct radiative forcing (DRF) by tropospheric sulfate aerosols. The DRF from the limited‐area model for both clear and cloudy regions is analyzed and the results compared against those obtained using general circulation model (GCM) parameterizations that perform the computations over coarse horizontal grids. In this idealized model study, the GCM calculations underestimate the clear sky DRF by approximately 73% and the cloudy sky DRF by approximately 60%. These results indicate that, for areas where the relative humidity is high and where there is substantial spatial variability in relative humidity and cloud, GCM calculations may considerably underestimate the DRF.