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| Titel |
HFC-152a and HFC-134a emission estimates and characterization of CFCs, CFC replacements, and other halogenated solvents measured during the 2008 ARCTAS campaign (CARB phase) over the South Coast Air Basin of California |
| VerfasserIn |
B. Barletta, P. Nissenson, S. Meinardi, D. Dabdub, F. Sherwood Rowland, R. A. VanCuren, J. Pederson, G. S. Diskin, D. R. Blake |
| 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 ; 11, no. 6 ; Nr. 11, no. 6 (2011-03-22), S.2655-2669 |
| Datensatznummer |
250009513
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| Publikation (Nr.) |
 copernicus.org/acp-11-2655-2011.pdf |
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| Zusammenfassung |
| This work presents results from the NASA Arctic Research of the Composition
of the Troposphere from Aircraft and Satellites (ARCTAS) study. Whole air
samples were obtained on board research flights that flew over California
during June 2008 and analyzed for selected volatile organic compounds,
including several halogenated species. Samples collected over the South
Coast Air Basin of California (SoCAB), which includes much of Los Angeles
(LA) County, were compared with samples from inflow air masses over the
Pacific Ocean. The levels of many halocarbon species were enhanced
significantly over the SoCAB, including compounds regulated by the Montreal
Protocol and subsequent amendments. Emissions estimates of HFC-152a
(1,1-difluoroethane, CH3CHF2; 0.82 ± 0.11 Gg) and HFC-134a
(1,1,1,2-tetrafluoroethane, CH2FCF3; 1.16 ± 0.22 Gg) in LA
County for 2008 were obtained using the observed HFC:carbon monoxide (CO)
enhancement ratio. Emission rates also were calculated for the SoCAB (1.60 ± 0.22 Gg yr−1
for HFC-152a and 2.12 ± 0.28 Gg yr−1 for
HFC-134a) and then extrapolated to the United States (32 ± 4 Gg yr−1
for HFC-152a and 43 ± 6 Gg yr−1 for HFC-134a) using
population data. In addition, emission rates of the two HFCs in LA County
and SoCAB were calculated by a second method that utilizes air quality
modeling. Emissions estimates obtained using both methods differ by less
than 25% for the LA County and less than 45% for the SoCAB. |
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