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| Titel |
Influence of the ozone profile above Madrid (Spain) on Brewer estimation of ozone air mass factor |
| VerfasserIn |
M. Antón, M. López, M. J. Costa, A. Serrano, D. Bortoli, M. Bañón, J. M. Vilaplana, A. M. Silva |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 8 ; Nr. 27, no. 8 (2009-08-14), S.3179-3183 |
| Datensatznummer |
250016623
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| Publikation (Nr.) |
 copernicus.org/angeo-27-3179-2009.pdf |
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| Zusammenfassung |
| The methodology used by Brewer spectroradiometers to estimate the ozone
column is based on differential absorption spectroscopy. This methodology
employs the ozone air mass factor (AMF) to derive the total ozone column
from the slant path ozone amount. For the calculating the ozone AMF, the
Brewer algorithm assumes that the ozone layer is located at a fixed height
of 22 km. However, for a real specific site the ozone presents a certain
profile, which varies spatially and temporally depending on the latitude,
altitude and dynamical conditions of the atmosphere above the site of
measurements. In this sense, this work address the reliability of the
mentioned assumption and analyses the influence of the ozone profiles
measured above Madrid (Spain) in the ozone AMF calculations. The
approximated ozone AMF used by the Brewer algorithm is compared with
simulations obtained using the libRadtran radiative transfer model code. The
results show an excellent agreement between the simulated and the
approximated AMF values for solar zenith angle lower than 75°. In
addition, the relative differences remain lower than 2% at 85°.
These good results are mainly due to the fact that the altitude of the ozone
layer assumed constant by the Brewer algorithm for all latitudes notably can
be considered representative of the real profile of ozone above Madrid
(average value of 21.7±1.8 km). The operational ozone AMF calculations
for Brewer instruments are limited, in general, to SZA below 80°.
Extending the usable SZA range is especially relevant for Brewer instruments
located at high mid-latitudes. |
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