Abstract
Growth and sedimentation of type-I polar stratospheric clouds (type-I PSCs) particles including nitric acid are examined using a numerical model. The PSCs particles which grow in the upper particle layer have enough large size (-10μm) to descend rapidly to the tropopause within several days. In the lower part of PSCs layer, evaporation of HNO3 from particulate matter occurs and acts as source of HNO3 vapor. From view point of stratospheric HNO3 distribution, the particle sedimentation effectively functions as vertical transport mechanism of HNO3 vapor from the upper PSCs layer to the lower layer and/or to the troposphere.
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