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| Titel |
A Relaxed Eddy Accumulation (REA)-GC/MS system for the determination of halocarbon fluxes |
| VerfasserIn |
K. E. Hornsby, M. J. Flynn, J. R. Dorsey, M. W. Gallagher, R. Chance, C. E. Jones, L. J. Carpenter |
| 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 ; 2, no. 2 ; Nr. 2, no. 2 (2009-08-07), S.437-448 |
| Datensatznummer |
250000560
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| Publikation (Nr.) |
 copernicus.org/amt-2-437-2009.pdf |
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| Zusammenfassung |
| Very short lived halocarbons (VSLH) play an important role in the transport
of halogen atoms to the troposphere and lower stratosphere. Here we
describe the development of a relaxed eddy accumulation system using gas
chromatography coupled to a mass spectrometer (REA-GC/MS) to determine
surface fluxes of VSLH with a time resolution of about 0.5 h. Laboratory
tests showed that use of a common inlet for upward, downward and deadband
flow paths resulted in mixing of upward and downward moving air masses,
therefore we recommend the use of separate inlets. The modified system
underwent field trials at Mace Head on the west coast of Ireland, where
there are dense kelp beds known to emit a range of halocarbons. Over a 16 h
period in mid-September 2007, the mean fluxes obtained were 16.1±1.8,
4.0±0.54 and 1.2±0.2 nmol m−2 day−1 for
CH2Br2 CH2ICl and CH2IBr, respectively. |
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