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Aerosol Loading in the Southeastern United States: Reconciling Surface and Satellite Observations : Volume 13, Issue 18 (16/09/2013)

By Ford, B.

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Book Id: WPLBN0003989830
Format Type: PDF Article :
File Size: Pages 15
Reproduction Date: 2015

Title: Aerosol Loading in the Southeastern United States: Reconciling Surface and Satellite Observations : Volume 13, Issue 18 (16/09/2013)  
Author: Ford, B.
Volume: Vol. 13, Issue 18
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
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 18 (16/09/2013). Retrieved from http://worldebookfair.org/


Description
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 (AOD) (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 fine particulate matter (smaller than 2.5 μm in aerodynamic diameter, PM2.5) and exhibits similar seasonality to total surface PM2.5. The GEOS-Chem model generally reproduces these surface aerosol measurements, but underrepresents 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 layer in summer.

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

Excerpt
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