Aerosol indirect radiative forcing of climate change is considered the most uncertain forcing of climate change over the industrial period, despite numerous studies demonstrating such modification of cloud properties and several studies quantifying resulting changes in shortwave radiative fluxes. We have previously used ground-based remote sensing of cloud optical depth ((tau)_(c)) by narrowband radiometry and liquid water path (LWP) by microwave radiometry to demonstrate substantial (factor of 2) day-to-day variation in cloud drop effective radius (r_(e)) at the ARM Southern Great Plains site (Kim et al., 2003). Here we extend the previous one-year study to 3-years (1999-2001) with special emphases on the relationship of cloud drop effective radius with light-scattering coefficient ((sigma)_(sp)), and the corresponding association of radiative forcing. The results showed the significant and more improved correlation of r_(e) with (sigma)_(sp), and the resultant enhancement of calculated net shortwave irradiance at the top of atmosphere in conjunction with a decrease in cloud drop radius.
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机译：尽管有许多研究表明云属性的这种改变以及量化短波辐射通量的若干研究，但是，气候变化的气候变化间接辐射迫使气候变化的最不确定强迫气候变化最不确定。我们以前用窄带辐射测定和液体水路（LWP）使用基于云光学深度（（tau）_（c））的地面遥感，以证明大量（因子为2）日常变异云落下的Arm Southern Great Plains站点（Kim等人，2003）的云下降有效半径（R_（e））。在这里，我们将前一年的一年度研究扩展到3年（1999-2001），特别重点是云下降有效半径与光散射系数（（Sigma）_（SP））的关系，以及相应的辐射关联强迫。结果表明，R_（e）与（sigma）_（sp）的相关性和更高的相关性，以及随着云下降半径的减少而在大气层顶部计算出的净短波辐照度的所得到的净短波辐照度。
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