A045-06
A New Aspect of Aerosol Indirect Effects

Tuesday, 8 December 2020: 05:45
Virtual
Yangang Liu1, Allison C McComiskey1, Meng Zhang2,3, Jingyi Chen4 and Tami Fairless1, (1)Brookhaven National Laboratory, Upton, NY, United States, (2)Beijing Meteorological Service, Beijing, China, (3)Tsinghua University, Beijing, China, (4)Pacific Northwest National Laboratory, Richland, WA, United States
Abstract:
A central link between aerosol and aerosol indirect effects is the concentration of cloud condensation nuclei (CCN) as a function of supersaturation (S), CCN spectrum. The CCN spectrum is often assumed to follow a power-law relationship NCCN = cSk, where c and k are two empirical parameters that are assumed to be independent in studies of aerosol indirect effects. Here we first show, by analyzing long-term CCN measurements, that c and k are actually related to each other. We then show theoretically that the c-k relationship will introduce additional contributions to both droplet number concentration (number effect) and relative dispersion (dispersion effect) of cloud droplet size distributions, leading to some new/unique phenomenon of aerosol indirect effects that has been largely ignored. Direct connection to the aerosol population properties such as size distribution and chemical composition is explored as well.
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