Multi-decadal trends of solar radiation reaching the surface: What is the role of aerosols?

Wednesday, 17 December 2014: 5:24 PM
Mian Chin1, Thomas L Diehl2, Huisheng Bian3, Hongbin Yu1,4, Yun Qian5, Martin Wild6, David G Streets7 and Paul W Stackhouse8, (1)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (2)NASA GSFC, Greenbelt, MD, United States, (3)NASA Goddard Space Flight Ctr, Greenbelt, MD, United States, (4)University of Maryland College Park, College Park, MD, United States, (5)Pacific Northwest Natl Lab, Richland, WA, United States, (6)ETH Swiss Federal Institute of Technology Zurich, Zurich, Switzerland, (7)Argonne National Laboratory, Argonne, IL, United States, (8)NASA Langley Research Center, Hampton, VA, United States
We present an investigation on multi-decadal changes of atmospheric aerosols and their effects on surface radiation using a global chemistry transport model along with the near-term to long-term data records. We present the aerosol trends in the past 3 decades (1980-2009) in different regions and assess their effects on the multi-decadal change of solar radiation reaching the surface (known as “dimming” or “brightening”). The regions include the major anthropogenic source regions (North America, Europe, Asia) that have been experiencing considerable changes of pollution emissions, dust and biomass burning influenced regions that have large interannual variabilities, and relatively remote regions that maybe considered as “background”. We will compare the GOCART model simulated surface radiation trends with data from the Global Energy Balance Archive (GEBA), the Baseline Solar Radiation Network (BSRN), and the China Meteorological Administration (CMA), as well as the satellite derived products. We will use the model to attribute the surface radiation changes to aerosol amount and type under all sky and clear sky conditions and link the changes to the emission trends in major source regions.