Radiative Forcing and Perturbations To Climate By Anthropogenic Sources of Soil Dust Aerosols

Friday, 19 December 2014: 9:15 AM
Ron L Miller1, Carlos Pérez García-Pando1,2, Jan P Perlwitz2 and Paul A Ginoux3, (1)NASA/GISS, New York, NY, United States, (2)Columbia Univ c/o NASA/GISS, New York, NY, United States, (3)NOAA GFDL, Princeton, NJ, United States
The radiative forcing and climate perturbation by natural sources ofsoil dust aerosols have been calculated previously by several models.However, human activities like agriculture also createsoil dust aerosols, and the most recent estimate of this contributionto global emission is near 25 percent. Anthropogenic sources have adifferent spatial distribution compared to natural sources, resultingin radiative forcing and a climate perturbation with a unique regionalpattern. Here, we use the NASA GISS Earth System ModelE to calculatethe forcing and climate perturbation by anthropogenic dust sources identified by Ginoux (2012).We contrast the regional distribution of climate anomalies forced byanthropogenic and natural sources. We also use prescribed differencesin the particle shortwave absorption to identify the remote influenceof dust sources upon precipitation and suggest a mechanism by whichthis influence occurs.