A31D-0094
GEOS-Chem AOD (Aerosol Optical Depth) predictions compared with starphotometry and CALIOP estimates during the polar winter
Wednesday, 16 December 2015
Poster Hall (Moscone South)
Sareh Hesaraki1, Konstantin Baibakov2, Norman T. O'Neill2, Randall Martin3, Andreas Bodo Herber4, Christopher W Perro3, Thomas J. Duck3 and Christoph Ritter5, (1)University of Sherbrooke, Sherbrooke, QC, Canada, (2)University of Sherbrooke, CARTEL, Sherbrooke, QC, Canada, (3)Dalhousie University, Physics and Atmospheric Science, Halifax, NS, Canada, (4)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Climate Science, Sea Ice Physics, Bremerhaven, Germany, (5)Alfred Wegener Institute Helmholtz- Center for Polar and Marine Research, Climate Sciences, Atmospheric circulations, Potsdam, Germany
Abstract:
We compared AOD (aerosol optical depth) predictions of GEOS-Chem (version 9.01.03) with AOD cloud-screened measurements extracted from starphotometer measurements at Eureka (Nunavut, Canada) and Ny Alesund (Spitsbergen) as well as with the CALIOP AOD product derived for CALIPSO orbit lines within a fixed radius of Eureka and Ny Alesund. The results, supported by Raman lidar measurements at Eureka and Ny Alesund, show degrees of similarity as well as differences that help to understand the quality of cloud-screened, starphotometry optical depths and the AOD / cloud discrimination performance of integrated CALIOP backscatter profiles (in the presence of very challenging statistical sampling constraints) as well as the quality of model predictions in a region and a time period of rare, model evaluation opportunities. The comparisons also help to understand the role of different types of aerosols (predominantly sub-micron) at these high Arctic sites and how one can prepare for the development of long-term, Polar-winter AOD climatologies.
