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| Titel |
Bromocarbons in the tropical coastal and open ocean atmosphere during the 2009 Prime Expedition Scientific Cruise (PESC-09) |
| VerfasserIn |
M. S. Mohd Nadzir, S. M. Phang, M. R. Abas, N. Abdul Rahman, A. Abu Samah, W. T. Sturges, D. E. Oram, G. P. Mills, E. C. Leedham, J. A. Pyle, N. R. P. Harris, A. D. Robinson, M. J. Ashfold, M. I. Mead, M. T. Latif, M. F. Khan, A. M. Amiruddin, N. Banan, M. M. Hanafiah |
| 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. 15 ; Nr. 14, no. 15 (2014-08-14), S.8137-8148 |
| Datensatznummer |
250118945
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| Publikation (Nr.) |
 copernicus.org/acp-14-8137-2014.pdf |
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| Zusammenfassung |
| Atmospheric concentrations of very short-lived species (VSLS) bromocarbons,
including CHBr3, CH2Br2, CHCl2Br, CHClBr2, and
CH2BrCl, were measured in the Strait of Malacca and the South China and
Sulu–Sulawesi seas during a two-month research cruise in June–July 2009.
The highest bromocarbon concentrations were found in the Strait of Malacca,
with smaller enhancements in coastal regions of northern Borneo. CHBr3
was the most abundant bromocarbon, ranging from 5.2 pmol mol−1 in
the Strait of Malacca to 0.94 pmol mol−1 over the open ocean.
Other bromocarbons showed lower concentrations, in the range of
0.8–1.3 pmol mol−1 for CH2Br2,
0.1–0.5 pmol mol−1 for CHCl2Br, and
0.1–0.4 pmol mol−1 for CHClBr2. There was no significant
correlation between bromocarbons and in situ chlorophyll a, but positive
correlations with both MODIS and SeaWiFS satellite chlorophyll a. Together,
the short-lived bromocarbons contribute an average of
8.9 pmol mol−1 (range 5.2–21.4 pmol mol−1) to
tropospheric bromine loading, which is similar to that found in previous
studies from global sampling networks (Montzka et al., 2011). Statistical
tests showed strong Spearman correlations between brominated compounds,
suggesting a common source. Log–log plots of CHBr3/CH2Br2
versus CHBr2Cl/CH2Br2 show that both chemical reactions and
dilution into the background atmosphere contribute to the composition of
these halocarbons at each sampling point. We have used the correlation to
make a crude estimate of the regional emissions of CHBr3 and to derive a
value of 32 Gg yr−1 for the Southeast (SE) Asian region
(10° N–20° S, 90–150° E). Finally, we note that
satellite-derived chlorophyll a (chl a) products do not always agree well
with in situ measurements, particularly in coastal regions of high turbidity,
meaning that satellite chl a may not always be a good proxy for marine
productivity. |
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