This title appears in the Scientific Report :
2014
Please use the identifier:
http://hdl.handle.net/2128/5927 in citations.
Airborne VOC measurements on board the Zeppelin NT during the PEGASOS campaigns in 2012 deploying the improved Fast-GC-MSD System
Airborne VOC measurements on board the Zeppelin NT during the PEGASOS campaigns in 2012 deploying the improved Fast-GC-MSD System
Volatile organic compounds (VOCs) comprise a large number of different species, estimated to 104-106. They are emitted on the Earth’s surface from a variety of biogenic and anthropogenic sources. VOCs are removed by multiple pathways from the atmosphere, by oxidation and finally by dry or wet deposi...
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Personal Name(s): | Jäger, Julia (Corresponding author) |
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Contributing Institute: |
Troposphäre; IEK-8 |
Imprint: |
Jülich
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
2014
|
Physical Description: |
182 S. |
Dissertation Note: |
Universität Köln, Diss., 2013 |
ISBN: |
978-3-89336-936-2 |
Document Type: |
Book |
Research Program: |
Trace gas and aerosol processes in the troposphere |
Series Title: |
Schriften des Forschunszentrums Jülich, Reihe Energie & Umwelt / Energy & Environment
205 |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Volatile organic compounds (VOCs) comprise a large number of different species, estimated to 104-106. They are emitted on the Earth’s surface from a variety of biogenic and anthropogenic sources. VOCs are removed by multiple pathways from the atmosphere, by oxidation and finally by dry or wet deposition. Most primary emitted VOCs are non-polar and therefore have a low solubility in water. Oxidation facilitates efficient VOC removal by wet deposition. In the atmosphere the main photochemical VOC oxidation agent is the OH radical. As a consequence the polarity of the VOCs is increased and they can be removed faster. The oxidation of VOCs proceeds in several steps until the VOCs are deposited or are eventually oxidized to carbon dioxide. A downside of the VOCs oxidation process lies in the production of significant amounts ozone if nitrogen oxide is present which is a serious health hazard. Most of the VOC oxidation takes place in lower part of the atmosphere between the altitudes of 100 to 1000 m, which is only sparsely analyzed. Therefore, fast VOCs measurements byGC-MSD on board the Zeppelin NT offered new important insights in the distribution of VOCs. The measurements were performed within the PEAGSOS campaigns in the Netherlands and in Italy in 2012. For the implementation of the GC-MSD system (HCG) on board the Zeppelin it was reconstructed to enhance its performance and to meet aviation requirements. The system was optimized to measure VOCs ranging from C4 to C10 as well asoxygenated VOCs (OVOCs) with a detection limit below 10 ppt. The analyzed VOCs for both parts of the campaigns showed low mean concentration below 5 ppb for all VOCs. Especially, the mixing ratios of the primary emitted VOCs were very low with mean values lower than 200 ppt. Higher concentrations could be observed for the OVOCs with mean concentrations up to 5 ppb. The most abundant OVOCs apart fromformaldehyde were methanol, ethanol, acetone and acetaldehyde. |