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Contrasting Effects on Deep Convective Clouds by Different Types of Aerosols
Published:2018-11-03 Hits:1893

 

Dr. Jonathan H. Jiang is a Principal Scientist of Engineering and Science Directorate and Managing Supervisor of the Aerosol and Cloud Research Group at NASA’s Jet Propulsion Laboratory(JPL). He is going to make a lecture at Fudan University. The information of lecture is:

 

Title: Contrasting Effects on Deep Convective Clouds by Different Types of Aerosols

Time: 3rd November, 13:30-15:00

Venue: No.1015 Meeting Room, Environmental Science Building, Jiangwan Campus, Fudan

 

Abstract of lecture:

Convective clouds produce a significant proportion of the global precipitation and play an important role in the energy and water cycles. We quantify changes of the convective cloud ice mass-weighted altitude centroid (ZIWC) as a function of aerosol optical thickness (AOT). Analyses are conducted in smoke, dust and polluted continental aerosol environments over South America, Central Africa and Southeast Asia, using the latest measurements from the CloudSat and CALIPSO satellites. We find aerosols can inhibit or invigorate convection, depending on aerosol type and concentration. On average, smoke tends to suppress convection and results in lower ZIWC than clean clouds. Polluted continental aerosol tends to invigorate convection and promote higher ZIWC. The dust aerosol effects are regionally dependent and their signs differ from place to place. Moreover, we find that the aerosol inhibition or invigoration effects do not vary monotonically with AOT and the variations depend strongly on aerosol type. Our observational findings indicate that aerosol type is one of the key factors in determining the aerosol effects on convective clouds.

 

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