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Aerosol Loading in the Southeastern United States: Reconciling Surface and Satellite Observations : Volume 13, Issue 4 (15/04/2013)

By Ford, B.

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Book Id: WPLBN0003996790
Format Type: PDF Article :
File Size: Pages 36
Reproduction Date: 2015

Title: Aerosol Loading in the Southeastern United States: Reconciling Surface and Satellite Observations : Volume 13, Issue 4 (15/04/2013)  
Author: Ford, B.
Volume: Vol. 13, Issue 4
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Heald, C. L., & Ford, B. (2013). Aerosol Loading in the Southeastern United States: Reconciling Surface and Satellite Observations : Volume 13, Issue 4 (15/04/2013). Retrieved from

Description: Department of Atmospheric Science, Colorado State University, Fort Collins, CO, USA. We investigate the seasonality in aerosols over the Southeastern United States using observations from several satellite instruments (MODIS, MISR, CALIOP) and surface network sites (IMPROVE, SEARCH, AERONET). We find that the strong summertime enhancement in satellite-observed aerosol optical depth (factor 2–3 enhancement over wintertime AOD) is not present in surface mass concentrations (25–55% summertime enhancement). Goldstein et al. (2009) previously attributed this seasonality in AOD to biogenic organic aerosol; however, surface observations show that organic aerosol only accounts for ~35% of PM2.5 mass and exhibits similar seasonality to total PM2.5. The GEOS-Chem model generally reproduces these surface aerosol measurements, but under represents the AOD seasonality observed by satellites. We show that seasonal differences in water uptake cannot sufficiently explain the magnitude of AOD increase. As CALIOP profiles indicate the presence of additional aerosol in the lower troposphere (below 700 hPa), which cannot be explained by vertical mixing; we conclude that the discrepancy is due to a missing source of aerosols above the surface in summer.

Aerosol loading in the Southeastern United States: reconciling surface and satellite observations

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