Calibration and quality assessment of DESCARTES : grabsampler for stratospheric tracers
DESCARTES is a light-weight, balloon-borne grab sampler for stratospheric long-lived tracers developed at the University of Cambridge. 33 flights have been performed with two versions of the instrument at northern latitudes by the DESCARTES team at the Swedish Institute of Space Physics (IRF) in Kir...
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ftumeauniv:oai:DiVA.org:umu-600 2023-10-09T21:53:13+02:00 Calibration and quality assessment of DESCARTES : grabsampler for stratospheric tracers Arvelius, Johan 2005 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-600 eng eng Rymdvetenskap IRF Scientific Report, 0284-1703 286 http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-600 urn:isbn:91-7305-945-5 info:eu-repo/semantics/openAccess Adsorption Balloon Carboxen CFC Chloro-Fluoro Carbon Grab sampling Halocarbon Molecular sieve Stratospheric tracer Tracer Ballong Halogeniserade kolväten Klor-Flourkarbon Spårgas Stratosfärisk spårgas Fusion Plasma and Space Physics plasma och rymdfysik Doctoral thesis, monograph info:eu-repo/semantics/doctoralThesis text 2005 ftumeauniv 2023-09-22T13:47:26Z DESCARTES is a light-weight, balloon-borne grab sampler for stratospheric long-lived tracers developed at the University of Cambridge. 33 flights have been performed with two versions of the instrument at northern latitudes by the DESCARTES team at the Swedish Institute of Space Physics (IRF) in Kiruna during the years 1997-2000. The general interest in long-lived stratospheric tracers is to study the general global circulation of air in the stratosphere and the exchange between the stratosphere and troposphere. In the study of chemical ozone depletion in the stratosphere, long-lived tracers serve as an important reference to distinguish between the variations in ozone of dynamical and chemical origin. This thesis focuses on calibrations and quality assessment of the measurements made with the third version of the DESCARTES instrument based at IRF. Two different general approaches to make calibrations are discussed. Uncertainty estimations for both of these methods are made and the results are tested by laboratory methods and by comparisons to other instruments, including comparisons between two versions of DESCARTES. Analyzed and calibrated flight data for all successful flights are presented. The basic principle of the instrument is to chemically adsorb a number of tracers (in practice only CFC-11 is measured) in an adsorption bed of Carboxen in a micro trap through which the sampled air is driven by a pump. After recovery the adsorbed species in the trap is desorbed by electrical heating of the trap and analysed by gas chromatography. The resulting estimated mixing ratios from the instrument are directly dependent on the adsorption of the sampled species being quantitative in the traps. Laboratory experiments are described using two traps in series, where the performance of the first is tested by sampling the breakthrough by the second. A model is developed to recreate these tests in order to be able to compensate for breakthrough during flights. The model showed that the adsorption in the traps is not ... Doctoral or Postdoctoral Thesis Kiruna Umeå University: Publications (DiVA) Descartes ENVELOPE(141.478,141.478,-66.779,-66.779) Kiruna |
institution |
Open Polar |
collection |
Umeå University: Publications (DiVA) |
op_collection_id |
ftumeauniv |
language |
English |
topic |
Adsorption Balloon Carboxen CFC Chloro-Fluoro Carbon Grab sampling Halocarbon Molecular sieve Stratospheric tracer Tracer Ballong Halogeniserade kolväten Klor-Flourkarbon Spårgas Stratosfärisk spårgas Fusion Plasma and Space Physics plasma och rymdfysik |
spellingShingle |
Adsorption Balloon Carboxen CFC Chloro-Fluoro Carbon Grab sampling Halocarbon Molecular sieve Stratospheric tracer Tracer Ballong Halogeniserade kolväten Klor-Flourkarbon Spårgas Stratosfärisk spårgas Fusion Plasma and Space Physics plasma och rymdfysik Arvelius, Johan Calibration and quality assessment of DESCARTES : grabsampler for stratospheric tracers |
topic_facet |
Adsorption Balloon Carboxen CFC Chloro-Fluoro Carbon Grab sampling Halocarbon Molecular sieve Stratospheric tracer Tracer Ballong Halogeniserade kolväten Klor-Flourkarbon Spårgas Stratosfärisk spårgas Fusion Plasma and Space Physics plasma och rymdfysik |
description |
DESCARTES is a light-weight, balloon-borne grab sampler for stratospheric long-lived tracers developed at the University of Cambridge. 33 flights have been performed with two versions of the instrument at northern latitudes by the DESCARTES team at the Swedish Institute of Space Physics (IRF) in Kiruna during the years 1997-2000. The general interest in long-lived stratospheric tracers is to study the general global circulation of air in the stratosphere and the exchange between the stratosphere and troposphere. In the study of chemical ozone depletion in the stratosphere, long-lived tracers serve as an important reference to distinguish between the variations in ozone of dynamical and chemical origin. This thesis focuses on calibrations and quality assessment of the measurements made with the third version of the DESCARTES instrument based at IRF. Two different general approaches to make calibrations are discussed. Uncertainty estimations for both of these methods are made and the results are tested by laboratory methods and by comparisons to other instruments, including comparisons between two versions of DESCARTES. Analyzed and calibrated flight data for all successful flights are presented. The basic principle of the instrument is to chemically adsorb a number of tracers (in practice only CFC-11 is measured) in an adsorption bed of Carboxen in a micro trap through which the sampled air is driven by a pump. After recovery the adsorbed species in the trap is desorbed by electrical heating of the trap and analysed by gas chromatography. The resulting estimated mixing ratios from the instrument are directly dependent on the adsorption of the sampled species being quantitative in the traps. Laboratory experiments are described using two traps in series, where the performance of the first is tested by sampling the breakthrough by the second. A model is developed to recreate these tests in order to be able to compensate for breakthrough during flights. The model showed that the adsorption in the traps is not ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Arvelius, Johan |
author_facet |
Arvelius, Johan |
author_sort |
Arvelius, Johan |
title |
Calibration and quality assessment of DESCARTES : grabsampler for stratospheric tracers |
title_short |
Calibration and quality assessment of DESCARTES : grabsampler for stratospheric tracers |
title_full |
Calibration and quality assessment of DESCARTES : grabsampler for stratospheric tracers |
title_fullStr |
Calibration and quality assessment of DESCARTES : grabsampler for stratospheric tracers |
title_full_unstemmed |
Calibration and quality assessment of DESCARTES : grabsampler for stratospheric tracers |
title_sort |
calibration and quality assessment of descartes : grabsampler for stratospheric tracers |
publisher |
Rymdvetenskap |
publishDate |
2005 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-600 |
long_lat |
ENVELOPE(141.478,141.478,-66.779,-66.779) |
geographic |
Descartes Kiruna |
geographic_facet |
Descartes Kiruna |
genre |
Kiruna |
genre_facet |
Kiruna |
op_relation |
IRF Scientific Report, 0284-1703 286 http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-600 urn:isbn:91-7305-945-5 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1779316469498118144 |