4.7 Article

Asian dust impacts on heterogeneous ice formation at Wuhan based on polarization lidar measurements

Journal

ATMOSPHERIC ENVIRONMENT
Volume 246, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2020.118166

Keywords

Polarization lidar; Asian dust; Cloud phase identification; Dust separation; Heterogeneous ice formation

Funding

  1. National Natural Science Foundation of China (NSFC) [41927804, 42005101]
  2. Fundamental Research Funds for the Central Universities [2042020kf0018]
  3. Meridian Space Weather Monitoring Project (China)

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The study analyzed the impact of Asian dust on middle cloud ice formation, finding significant influences on heterogeneous ice formation and a high association between dust-related heterogeneous ice formation and polluted dust. Furthermore, comparisons of aerosol loadings at two different continental sites suggest that sulfate, black carbon, and organic carbon may not be effective ice nuclei under dust-free conditions.
We analyzed 456 thin mid-level cloud layers based on two-year polarization lidar measurements in Wuhan (30.53 degrees N, 114.37 degrees E), China. Dust separation algorithm based on lidar measurements was implemented to identify clouds under influences of dust and non-dust components. Through comparisons of ice-containing cloud fractions under dust and dust-free conditions, significant impacts of Asian dust on heterogeneous ice formation are found. 20% more ice-containing cloud fractions occurred under influence of Asian dust at temperature range from -25 to -10 degrees C. More than 90% of dust-related heterogeneous ice formation were associated with polluted dust. In order to investigate the efficiency of non-dust components to serve as ice nuclei (IN), results at two continental sites (Wuhan, East Asia and Leipzig, Central Europe) with very different aerosol loadings were compared and discussed. Weak and similar ice nucleation characteristics under dust-free conditions of different loadings of sulfate, black carbon and organic carbon, may suggest such components are all less effective INs.

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