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| Titel |
CO2 isotope analysis of air samples in the upper troposphere-lowermost stratosphere region, the project CARIBIC |
| VerfasserIn |
S. S. Assonov, C. A. M. Brenninkmeijer, C. Koeppel, T. Schuck, A. Zahn, P. Taylor |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250024272
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| Zusammenfassung |
| The project CARIBIC (http://caribic-atmospheric.com), aims to study atmospheric chemistry and composition by measuring many compounds and species in the upper troposphere-lowermost stratosphere (UT/LMS) around the globe by using a commercial aircraft. CARIBIC has two phases, CARIBIC-1 and CARIBIC-2 (CARIBIC-LUFTHANSA). During CARIBIC-1 (flights from Germany to mainly India, South Africa and the Caribbean), CO2 isotope composition was measured on cryogenic extracts from large air samples of 250 l STP. CO2 isotope analysis in the UT/LMS and free troposphere is continued by CARIBIC-LUFTHANSA. The new instrument container of CARIBIC-LUFTHANSA operates onboard a Lufthansa A340-600 (Frankfurt, Germany) with monthly flights from Frankfurt to remote destinations, collecting 28 air samples for laboratory analyses. A new CO2 extraction line was installed at JRC-IRMM (Geel, Belgium) and high quality isotope measurements started in June 2007. Particular focus is on traceable calibration to the VPDB-CO2 scale as well as on the quality of d18O(CO2) data, which give important information about CO2 exchange with oceans, soils and biosphere. d18O(CO2) is discussed to be a long-term indicator of global changes in the CO2 cycle as well as oceans’ feedback. About 500 air samples analysed from June 2007 to January 2009 give a reliable data set for free troposphere and the UT/LMS region. New data obtained, trends and tracer-tracer correlations will be presented at the meeting. |
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