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| Titel |
An airborne perfluorocarbon tracer system and its first application for a Lagrangian experiment |
| VerfasserIn |
Y. Ren, R. Baumann, H. Schlager |
| 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 ; 8, no. 1 ; Nr. 8, no. 1 (2015-01-09), S.69-80 |
| Datensatznummer |
250116039
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| Publikation (Nr.) |
 copernicus.org/amt-8-69-2015.pdf |
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| Zusammenfassung |
| A perfluorocarbon tracer system (PERTRAS), specifically designed for
Lagrangian aircraft experiments, has been developed by the Deutsches Zentrum
für Luft- und Raumfahrt (German Aerospace Center, DLR). It consists of
three main parts: a tracer release unit (RU), an adsorption tube sampler
(ATS), and a tracer analytical system. The RU was designed for airborne tracer
release experiments; meanwhile, it can be used on various platforms for
different experimental purposes (here research vessel). PERTRAS was for the
first time applied in the field campaign Stratospheric ozone: Halogen Impacts
in a Varying Atmosphere (SHIVA) in November 2011. An amount of 8.8 kg
perfluoromethylcyclopentane (PMCP) was released aboard the research vessel
Sonne (RV Sonne) near the operational site of this
campaign, Miri, Malaysia, on 21 November. The tracer samples collected using
the ATS onboard the DLR research aircraft Falcon were analyzed in the
laboratory using a thermal desorber–gas chromatography–mass spectrometry
(TD–GC–MS) system. Guided by forecasts calculated with the Lagrangian model
Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT), 64 tracer
samples were collected onboard the Falcon approximately 5 and 25 h after the
release, mostly with a time resolution of 1 min. Enhanced PMCP
concentrations relative to ambient PMCP background values (mean:
6.62 fmol mol−1) were detected during three intersects of the fresh
tracer plume (age 5 h), with a maximum value of 301.33 fmol mol−1.
This indicates that the fresh tracer plume was successfully intercepted at
the forecast position. During the second flight, 25 h after the release, the
center of tracer plume was not detected by the sampling system due to a
faster advection of the plume than forecast. The newly developed PERTRAS
system has been successfully deployed for the first time. The instrumental
setup and comparisons between the measurements and HYSPLIT simulations are
presented in this study. |
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