Aerosol indirect effects as a function of cloud top pressure
Aerosol indirect effects as a function of cloud top pressure
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DOI：
10.1029/2006jd007383
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发表时间：
2007-03
影响因子：
--
通讯作者：
S. Massie;A. Heymsfield;C. Schmitt;D. Müller;P. Seifert
中科院分区：
文献类型：
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作者：
S. Massie;A. Heymsfield;C. Schmitt;D. Müller;P. Seifert
[1] 通过对中等分辨率成像光谱仪 (MODIS) 辐射率、反射率和气溶胶光学深度数据的分析，将气溶胶间接影响量化为 2003 年 2 月和 2005 年 3 月印度和印度洋上空云顶压力的函数。我们检验了整个对流层都存在气溶胶间接影响的假设。理论云反射率值通过应用离散坐标 DISORT 多重散射程序计算得出，作为云顶压力、气溶胶光学深度和云相（即液滴和云冰）的函数，并与 1.38 和 3.75 μm 处的 MODIS 云反射率数据进行比较。气溶胶的间接影响对于与液滴相关的压力水平是明显的；也就是说，陆地和海洋上空液滴的云反射率相对于 3.75 μm 气溶胶光学深度的导数大于与理论气溶胶直接效应相关的相应导数。对于与对流层冰晶相关的压力水平，气溶胶的间接影响并不明显。
[1] Aerosol indirect effects are quantified as a function of cloud top pressure over India and the Indian Ocean in February and March 2003–2005 from analyses of moderate resolution imaging spectroradiometer (MODIS) radiances, reflectance, and aerosol optical depth data. We test the hypothesis that aerosol indirect effects are present throughout the troposphere. Theoretical cloud reflectance values are calculated by application of the discrete-ordinate DISORT multiple scattering program, as a function of cloud top pressure, aerosol optical depth, and cloud phase (i.e., liquid droplets and cloud ice), and are compared to MODIS cloud reflectance data at 1.38 and 3.75 μm. Aerosol indirect effects are apparent for pressure levels associated with liquid droplets; that is, derivatives of cloud reflectance with respect to aerosol optical depth at 3.75 μm for liquid droplets over land and ocean are larger than corresponding derivatives associated with theoretical aerosol direct effects. Aerosol indirect effects are not apparent for pressure levels associated with tropospheric ice crystals.