Ice particle production in mid-level stratiform mixed-phase clouds observed with collocated A-Train measurements

Zhang, Damao; Wang, Zhien; Kollias, Pavlos; Vogelmann, Andrew M.; Yang, Kang; Luo, Tao

Collocated A-Train CloudSat radar and CALIPSO lidar measurements between 2006 and 2010 are analyzed to study primary ice particle production characteristics in mid-level stratiform mixed-phase clouds on a global scale. For similar clouds in terms of cloud top temperature and liquid water path, Northern Hemisphere latitude bands have layer-maximum radar reflectivity (ZL) that is inline-formula∼ 1 to 8 dBZ larger than their counterparts in the Southern Hemisphere. The systematically larger ZL under similar cloud conditions suggests larger ice number concentrations in mid-level stratiform mixed-phase clouds over the Northern Hemisphere, which is possibly related to higher background aerosol loadings. Furthermore, we show that springtime northern mid- and high latitudes have ZL that is larger by up to 6 dBZ (a factor of 4 higher ice number concentration) than other seasons, which might be related to more dust events that provide effective ice nucleating particles. Our study suggests that aerosol-dependent ice number concentration parameterizations are required in climate models to improve mixed-phase cloud simulations, especially over the Northern Hemisphere.

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Zhang, Damao / Wang, Zhien / Kollias, Pavlos / et al: Ice particle production in mid-level stratiform mixed-phase clouds observed with collocated A-Train measurements. 2018. Copernicus Publications.

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