EGU General Assembly 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Smaller land-sea contrast on probability of precipitation (POP) of warm clouds over globe

Jihu Liu1,2, Minghuai Wang1,2, Daniel Rosenfeld1,3, and Yannian Zhu4
Jihu Liu et al.
  • 1School of Atmospheric Sciences, Nanjing University, Nanjing , China
  • 2Joint International Research Laboratory of Atmospheric and Earth System Sciences and Institute for Climate and Global Change Research, Nanjing University, Nanjing, China
  • 3Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
  • 4Meteorological Institute of Shaanxi Province, Xi'an, China

Proper observation of global warm rain and understanding of its formation processes can significantly advance our understanding on aerosol-cloud-precipitation interactions. Previous study shows that due to smaller cloud effective radii (Re), rain from liquid clouds over land is sharply reduced compared to oceans (Mülmenstädt, 2015). However, in our study, we use A-Train satellite observations to show that there should be smaller land-sea difference on probability of precipitation (POP) of warm clouds between land and oceans. The discrepancy is probably because the algorithm bias in CloudSat precipitation flag products over land, which may mistakenly treat drizzle as no rain. We also find that if Re is smaller than 14 mm, no matter how thick the warm cloud is it can hardly produce significant precipitation (here defined as radar reflectivity factor lager than 0dBZ), which can generate dynamic feedback on the development of clouds.

How to cite: Liu, J., Wang, M., Rosenfeld, D., and Zhu, Y.: Smaller land-sea contrast on probability of precipitation (POP) of warm clouds over globe, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-14533,, 2021.

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