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| Titel |
ACE-FTS and HALOE observations of hydrogen fluoride (HF) and their comparison with SLIMCAT chemical transport model calculations |
| VerfasserIn |
Jeremy Harrison, Martyn Chipperfield, Chris Boone, Peter Bernath, Lucien Froidevaux, John Anderson, James Russell III |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250108487
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| Publikation (Nr.) |
 EGU/EGU2015-8242.pdf |
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| Zusammenfassung |
| The majority of fluorine in the atmosphere has resulted from the anthropogenic emission of
chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and hydrofluorocarbons
(HFCs). Most tropospheric fluorine is present in its emitted ‘organic’ form due to the
molecules having long lifetimes (up to a decade or longer). Thus they are able to reach the
stratosphere where they are broken down, liberating fluorine. The principal degradation
products are carbonyl fluoride (COF2), carbonyl chloride fluoride (COClF), and
hydrogen fluoride (HF); of these HF is the most abundant. In fact at the top of the
stratosphere most of the fluorine is present as HF, which, due to its extreme stability, is an
almost permanent reservoir of stratospheric fluorine. Since anthropogenic emissions
of fluorine continue unabated, the amount of HF in the atmosphere continues to
increase.
The use of satellite remote-sensing techniques allows the measurement of HF
atmospheric abundances with impressive global coverage, and the investigation of HF trends,
and seasonal and latitudinal variability. This work presents global distributions
and trends of HF using data from two satellite limb instruments: the Atmospheric
Chemistry Experiment Fourier transform spectrometer (ACE-FTS), onboard the
SCISAT satellite, which has been recording atmospheric spectra since 2004, and
the HALogen Occultation Experiment, onboard the Upper Atmosphere Research
Satellite (UARS), which recorded atmospheric spectra between 1991 and 2005.
These observations are compared with the output of SLIMCAT, a state-of-the-art
three-dimensional chemical transport model (CTM). The model aids in the interpretation of
the HF satellite observations, and the comparison provides a validation of emission
inventories and the atmospheric degradation reaction schemes used in the model. |
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