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| Titel |
Optical extinction by upper tropospheric/stratospheric aerosols and clouds: GOMOS observations for the period 2002–2008 |
| VerfasserIn |
F. Vanhellemont, D. Fussen, N. Mateshvili, C. Tetard, C. Bingen, E. Dekemper, N. Loodts, E. Kyrölä, V. Sofieva, J. Tamminen, A. Hauchecorne, J.-L. Bertaux, F. Dalaudier, L. Blanot, O. Fanton d'Andon, G. Barrot, M. Guirlet, T. Fehr, L. Saavedra |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 16 ; Nr. 10, no. 16 (2010-08-27), S.7997-8009 |
| Datensatznummer |
250008733
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| Publikation (Nr.) |
 copernicus.org/acp-10-7997-2010.pdf |
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| Zusammenfassung |
| Although the retrieval of aerosol extinction coefficients from satellite
remote measurements is notoriously difficult (in comparison with gaseous
species) due to the lack of typical spectral signatures, important information
can be obtained. In this paper we present an overview of the current operational
nighttime UV/Vis aerosol extinction profile results for the GOMOS star occultation
instrument, spanning the period from August 2002 to May 2008. Some problems still
remain, such as the ones associated with incomplete scintillation correction and
the aerosol spectral law implementation, but good quality extinction values are
obtained at a wavelength of 500 nm. Typical phenomena associated with atmospheric
particulate matter in the Upper Troposphere/Lower Stratosphere (UTLS) are easily
identified: Polar Stratospheric Clouds, tropical subvisual cirrus clouds,
background stratospheric aerosols, and post-eruption volcanic aerosols (with
their subsequent dispersion around the globe). For the first time, we show
comparisons of GOMOS 500 nm particle extinction profiles with the ones of other
satellite occultation instruments (SAGE II, SAGE III and POAM III), of which the
good agreement lends credibility to the GOMOS data set. Yearly zonal statistics
are presented for the entire period considered. Time series furthermore convincingly
show an important new finding: the sensitivity of GOMOS to the sulfate input by
moderate volcanic eruptions such as Manam (2005) and Soufrière Hills (2006).
Finally, PSCs are well observed by GOMOS and a first qualitative analysis of the
data agrees well with the theoretical PSC formation temperature. Therefore, the
importance of the GOMOS aerosol/cloud extinction profile data set is clear: a
long-term data record of PSCs, subvisual cirrus, and background and volcanic
aerosols in the UTLS region, consisting of hundreds of thousands of altitude
profiles with near-global coverage, with the potential to fill the aerosol/cloud
extinction data gap left behind after the discontinuation of occultation
instruments such as SAGE II, SAGE III and POAM III. |
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