Aerosol-cloud-land surface interactions within tropical convection simulations

Grant, Leah D.; van den Heever, Susan C.; Lu, Lixin
May 2013
AIP Conference Proceedings;May2013, Vol. 1527 Issue 1, p739
Academic Journal
Mutual impacts of enhanced aerosol concentrations and reductions to surface roughness length on convective rainfall patterns are investigated within idealized simulations of tropical convection focused along a sea-breeze convergence zone. Results indicate that enhanced aerosol concentrations lead to more intense convective precipitation that occurs over a smaller area. Reduced surface roughness length leads to a temporal delay in enhanced precipitation via two competing mechanisms: reduced surface latent heat fluxes and enhanced sea breeze convergence. Mutual impacts of enhanced aerosol concentrations and reduced surface roughness length on convective rainfall patterns lead to a further temporal delay in increased precipitation, which appears to be due to a negative feedback on the strength of the sea breeze convergence. These results indicate that it is important to consider the mutual aerosol-cloud-land surface interactions as part of a complex, nonlinear system in order to correctly represent the spatial and temporal patterns of rainfall.


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