资源环境科技发展态势分析平台

We quantified effects of dust load on the cloud top ice cloud fraction (ICF) in terms of the dust extinction coefficient (σ_ext). We analyzed 3‐year datasets obtained from an active satellite sensor over mid‐to‐high latitudes in the northern hemisphere for temperatures (T) between 230 and 273 K and σ_ext values between 0.005 and 0.145 km^–1. At about 250K, ICF changed by about 30% in response to the above range of σ_ext, whereas at extreme T values, ICF was relatively insensitive to σ_ext. Thus we concluded that ICF was primarily determined by T, with substantial influence of σ_ext at about 250K, likely due to increased opportunities for freezing as σ_ext increases. Sensitivity of ICF was the lowest both at the largest σ_ext and lowest T, and at the smallest σ_ext and highest T, while it was the highest at about 0.03km^‐1 of σ_ext and about 250K.