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Discussion papers
https://doi.org/10.5194/acp-2019-706
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-706
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 12 Aug 2019

Submitted as: research article | 12 Aug 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Retrieval of the vertical profile of the cloud effective radius from the Chinese FY-4 next-generation geostationary satellite

Yilun Chen1,2, Guangcan Chen1, Chunguang Cui3, Aoqi Zhang1,2, Rong Wan3, Shengnan Zhou1,4, Dongyong Wang4, and Yunfei Fu1 Yilun Chen et al.
  • 1School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China
  • 2School of Atmospheric Sciences, Sun Yat-Sen University, Zhuhai, 519082, China
  • 3Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research, Institute of Heavy Rain, China Meteorological Administration, Wuhan, 430205, China
  • 4Anhui Meteorological Observatory, Hefei, 230001, China

Abstract. The vertical profile of the cloud effective radius (Re) reflects the precipitation-forming process. Based on observations from the first of the Chinese next-generation geostationary meteorological satellites (FY-4A), we established a new method for objectively obtaining the vertical temperature vs Re profile. Re was calculated using a bi-spectrum lookup table and cloud clusters were objectively identified using the maximum temperature gradient method. The Re profile in a certain cloud was then obtained by combining these two sets of data. Compared with the conventional method used to obtain the Re profile from the subjective division of a region, objective cloud cluster identification establishes a unified standard, increases the credibility of the Re profile and facilitates the comparison of different Re profiles. To investigate its performance, we selected a heavy precipitation event from the Integrative Monsoon Frontal Rainfall Experiment in summer 2018. The results showed that the method successfully identified and tracked the cloud cluster. The Re profile showed completely different morphologies in different life stages of the cloud cluster, which is important in the characterization of the formation of precipitation and the temporal evolution of microphysical processes.

Yilun Chen et al.
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Short summary
The vertical profile of the cloud effective radius reflects the precipitation-forming process. We developed an algorithm for retrieving it based on the objective cloud cluster identification rather than the subjective polygon of conventional method. The profile shows completely different morphologies in different life stages of the cloud cluster, which is important in the characterization of the formation of precipitation and the temporal evolution of microphysical processes.
The vertical profile of the cloud effective radius reflects the precipitation-forming process....
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