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| Titel |
Characterization of atmospheric aerosol in the US Southeast from ground- and space-based measurements over the past decade |
| VerfasserIn |
E. J. Alston, I. N. Sokolik, O. V. Kalashnikova |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 5, no. 7 ; Nr. 5, no. 7 (2012-07-18), S.1667-1682 |
| Datensatznummer |
250003007
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| Publikation (Nr.) |
 copernicus.org/amt-5-1667-2012.pdf |
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| Zusammenfassung |
| This study examines how aerosols measured from the ground and space over the
US Southeast change temporally over a regional scale during the past
decade. PM2.5 (particulate
matter with aerodynamic diameter >2.5 micrometers) data consist of two datasets that represent the measurements
that are used for regulatory purposes by the US EPA (Environmental Protection Agency) and continuous
measurements used for quickly disseminating air quality information. AOD (aerosol optical depth) data
come from three NASA sensors: the MODIS sensors onboard Terra and Aqua
satellites and the MISR sensor onboard the Terra satellite. We analyze all
available data over the state of Georgia from 2000–2009 of both types of
aerosol data. The analysis reveals that during the summer the large
metropolitan area of Atlanta has average PM2.5 concentrations that are 50%
more than the remainder of the state. Strong seasonality is detected in both
the AOD and PM2.5 datasets, as evidenced by a threefold increase of AOD
from mean winter values to mean summer values, and the increase in PM2.5
concentrations is almost twofold over the same period. Additionally,
there is agreement between MODIS and MISR onboard the Terra satellite
during the spring and summer, having correlation coefficients of 0.64 and
0.71, respectively. Monthly anomalies were used to determine the presence of a
trend in all considered aerosol datasets. We found negative linear trends for
both the monthly AOD anomalies from MODIS onboard Terra and the PM2.5
datasets, which are statistically significant. Decreasing trends were also
found for MISR onboard Terra and MODIS onboard Aqua, but those trends were
not statistically significant. The observed decrease in AOD and PM2.5
concentrations may be indicative of the brightening over the study region during the past decade. |
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