Earth System Science Center and Department of Atmospheric Science at The University of Alabama in Huntsville

Special Seminar – May 12

NASA/UAH Earth and Atmospheric Science Seminars

 

Tuesday, May 12, 2015

 

11:00 am;  Room 4078

 

 

Atmospheric Science Assistant to Associate Professor Candidate Dr. Jiwen Fan

Senior Research Scientist

Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory

 

 

Aerosol- Deep Convective Cloud (DCC) Interactions: from Process-level Understanding to Parameterization

 

Deep convective clouds (DCCs) play a crucial role in the general circulation, energy, and hydrological cycle of our climate system.  Anthropogenic and natural aerosol particles may influence DCCs through changes in cloud properties, precipitation regimes, and radiation balance.  In this talk, I will present (1) the important factors regulating aerosol impacts on DCCs; (2) the significance of aerosols modifications to convective intensity and cloud anvil properties by acting as cloud condensation nuclei (CCN) and ice nuclei (IN); and (3) a new mechanism for explaining ubiquitously-observed cloud invigoration phenomena, from our process-level studies through these years.  Furthermore, I will talk about improving bulk microphysical parameterizations and parameterizing aerosol-cumulus interactions in regional and global climate models.  At the regional scale, aerosol impacts through DCCs are significant in (1) producing a strong surface cooling in daytime and warming at night, and (2) redistributing precipitation pattern and occurrence frequencies of light and heavy rain.  Those effects are missing from current large-scale models.  Further directions in this field will be discussed.

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