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| Titel |
Origin of anthropogenic hydrocarbons and halocarbons measured in the summertime european outflow (on Crete in 2001) |
| VerfasserIn |
V. Gros, J. Williams, J. A. van Aardenne, G. Salisbury, R. Hofmann, M. G. Lawrence, R. Kuhlmann, J. Lelieveld  , M. Krol, H. Berresheim, J. M. Lobert, E. Atlas |
| 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 ; 3, no. 4 ; Nr. 3, no. 4 (2003-08-27), S.1223-1235 |
| Datensatznummer |
250001151
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| Publikation (Nr.) |
 copernicus.org/acp-3-1223-2003.pdf |
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| Zusammenfassung |
| During the Mediterranean Intensive Oxidant Study MINOS in August 2001, 87 air samples were
collected at the ground-based station Finokalia (35°19'N, 25°40'E) on the north coast of Crete and
subsequently analysed by GC-MS. The analysis includes various hydrocarbons, organo-halogens, HCFCs
and CFCs. These compounds have a wide variety of sources and sinks and a large range of atmospheric
lifetimes. We evaluated the characteristics of the sampling site in terms of proximity to individual sources by
plotting the measured variability of these species against lifetime. The resulting linear relationship suggests
that the sampling site is representative of intermediate conditions between a remote site and one that is in the
vicinity of a wide variety of sources. Our analysis of air mass origin and chemical ratios also shows
that several distinct anthropogenic sources influenced the atmospheric composition over Crete. Propane
observations are compared to a global model to assess the fossil fuel related emission inventory. Although
the model reproduces the general pattern of the propane variations, the model mixing ratios are
systematically too low by a factor of 1.5 to 3, probably due to an underestimation of the propane emissions
from east European countries in the underlying global database EDGAR. Another important finding was that
methyl chloroform, a compound banned under the Montreal protocol, showed significant enhancements from
background, which were well correlated with CFC-113. This suggests continued use and emission of methyl
chloroform by one or more European countries. We also discuss the observed variations of methyl bromide
and suggest that the significant peak observed on 12 August 2001 reflects heavy agricultural use as a soil
fumigant in Italy. |
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