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| Titel |
Chemical climatology of the southeastern United States, 1999-2013 |
| VerfasserIn |
G. M. Hidy, C. L. Blanchard, K. Baumann, E. Edgerton, S. Tanenbaum, S. Shaw, E. Knipping, I. Tombach, J. Jansen, J. Walters |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 21 ; Nr. 14, no. 21 (2014-11-13), S.11893-11914 |
| Datensatznummer |
250119155
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| Publikation (Nr.) |
 copernicus.org/acp-14-11893-2014.pdf |
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| Zusammenfassung |
| A series of experiments (the Southern Oxidant and Aerosol Study – SOAS) took
place in central Alabama in June–July, 2013 as part of the broader Southern
Atmosphere Study (SAS). These projects were aimed at studying oxidant
photochemistry and formation and impacts of aerosols at a detailed process
level in a location where high biogenic organic vapor emissions interact
with anthropogenic emissions, and the atmospheric chemistry occurs in a
subtropical climate in North America. The majority of the ground-based
experiments were located at the Southeastern Aerosol Research and
Characterization (SEARCH) Centreville (CTR) site near Brent, Alabama, where
extensive, unique aerometric measurements of trace gases and
particles and meteorology were made beginning in the early 1990s through 2013. The SEARCH
network data permits a characterization of the temporal and spatial context of
the SOAS findings. Our earlier analyses of emissions and air quality trends
are extended through 2013 to provide a perspective for continued decline in
ambient concentrations, and the implications of these changes to regional
sulfur oxide, nitrogen–ozone, and carbon chemistry. The narrative supports
the SAS program in terms of long-term average chemistry (chemical
climatology) and short-term comparisons of early summer average spatial
variability across the southeastern US at high temporal (hourly) resolution.
The long-term measurements show that the SOAS experiments took place during
the second wettest and coolest year in the 2000–2013 period, with lower than
average solar radiation. The pollution levels at CTR and other SEARCH sites
were the lowest since full measurements began in 1999. Changes in
anthropogenic gas and particle emissions between 1999 and 2013 account for
the decline in pollutant concentrations at the monitoring sites in the
region. The data provide an opportunity to contrast SOAS results with
temporally and spatially variable conditions in support of the development
of tests for the robustness of SOAS findings. |
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