Environmental & Climate Sciences Department Seminar

"The impact of organic aerosols partitioning on activated cloud number concentration"

Presented by Chloe Y. Gao, NASA Goddard Institute for Space Studies

Thursday, March 1, 2018, 11:00 am — Conference Room Bldg 815E

We examined the impact of condensing organic aerosols on activated cloud number concentration in a new aerosol microphysics model, MATRIX-VBS. The model, which can be used as a box model or a module in a global model, includes the volatilitybasis set (VBS) framework in an aerosol microphysical scheme MATRIX (Multiconfiguration Aerosol TRacker of mIXing state) that resolves aerosol mass and number concentrations and aerosol mixing state. Parameters such as aerosol chemical composition, mass and number concentrations, and particle sizes which affect activated cloud number concentration were thoroughly evaluated via a suite of Monte-Carlo simulations. Results from the box model show that by including the condensation of organic aerosols, under most conditions, the new model (MATRIX-VBS) has less activated particles compared to the original model (MATRIX), which treats organic aerosols as non-volatile. When implemented in the global model GISS ModelE as a module, we expect that the improved box model in the global scale would more accurately represent aerosol-cloud interactions. Thus it would offer us valuable insights on how the addition of organic partitioning would change cloud activation in the global atmosphere and its implications for climate.

Hosted by: Laura Fierce

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