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| Titel |
Time dependent profile retrieval of UV/vis absorbing radicals from balloon-borne limb measurements – a case study on NO2 and O3 |
| VerfasserIn |
L. Kritten, A. Butz, M. Dorf, T. Deutschmann, S. Kühl, C. Prados-Roman, J. Puķīte, A. Rozanov, R. Schofield, K. Pfeilsticker |
| 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 ; 3, no. 4 ; Nr. 3, no. 4 (2010-07-16), S.933-946 |
| Datensatznummer |
250001210
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| Publikation (Nr.) |
 copernicus.org/amt-3-933-2010.pdf |
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| Zusammenfassung |
| A new "Bayesian" minimization algorithm for the retrieval of the diurnal
variation of UV/vis absorbing radicals (O3, NO2, BrO, OClO and HONO) from
balloon-borne limb scattered skylight observations is discussed. The method
evaluates spectroscopic measurements in combination with radiative transfer
calculations to drive a mathematical inversion on a discrete time and height
grid. Here, the proposed method is applied to data obtained during
two deployments of the mini-DOAS instrument on different balloon payloads in
northern Brazil in June 2005. The retrieval is tested by comparing the inferred
profiles to in-situ ozone sounding data and to measurements of the
ENVISAT/SCIAMACHY satellite instrument performed during a collocated overpass.
The comparison demonstrates the strength and validity of our approach.
In particular for time-varying radical concentrations, photochemical corrections
due to temporal mismatch of the corresponding
observations are rendered dispensable. Thus, limb scanning UV/vis spectrometry
from balloon platforms offers a more direct and concise approach for satellite
validation of radical measurements than solar occultation
measurements. Furthermore, monitoring of the diurnal variation of stratospheric
radicals allows us to constrain photochemical parameters which are critical for
stratospheric ozone chemistry, such as the photolysis frequency of
N2O5 by observations of the diurnal variation of NO2. |
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