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| Titel |
The UV-A and visible solar irradiance spectrum: inter-comparison of absolutely calibrated, spectrally medium resolution solar irradiance spectra from balloon- and satellite-borne measurements |
| VerfasserIn |
W. Gurlit, H. Bösch, H. Bovensmann, J. P. Burrows, A. Butz, C. Camy-Peyret, M. Dorf, K. Gerilowski, A. Lindner, S. Noël, U. Platt, F. Weidner, K. Pfeilsticker |
| 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 ; 5, no. 7 ; Nr. 5, no. 7 (2005-07-26), S.1879-1890 |
| Datensatznummer |
250002987
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| Publikation (Nr.) |
 copernicus.org/acp-5-1879-2005.pdf |
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| Zusammenfassung |
| Within the framework of the ENVISAT/-SCIAMACHY satellite
validation, solar irradiance spectra are absolutely measured at
moderate resolution in the UV/visible spectral range (in the UV
from 316.7-418 nm and the visible from 400-652 nm at a full
width half maximum resolution of 0.55 nm and 1.48 nm,
respectively) from aboard the azimuth-controlled LPMA/DOAS balloon
gondola at around 32 km balloon float altitude. After accounting
for the atmospheric extinction due to Rayleigh scattering and
gaseous absorption (O3 and NO2), the measured solar spectra
are compared with previous observations. Our solar irradiance
spectrum perfectly agrees within +0.03% with the re-calibrated
Kurucz et al. (1984) solar spectrum (Fontenla et al., 1999, called
MODTRAN 3.7) in the visible spectral range (415-650 nm), but it
is +2.1% larger in the (370-415 nm) wavelength interval, and
-4% smaller in the UV-A spectral range (316.7-370 nm), when
the Kurucz spectrum is convolved to the spectral resolution of our
instrument. Similar comparisons of the SOLSPEC (Thuillier et al.,
1997, 1998a, b) and SORCE/SIM (Harder et al., 2000) solar spectra
with MODTRAN 3.7 confirms our findings with the values being
-0.5%, +2%, and -1.4% for SOLSPEC -0.33%, -0.47%, and -6.2%
for SORCE/SIM, respectively. Comparison of the SCIAMACHY solar
spectrum from channels 1 to 4 (- re-calibrated by the University
of Bremen -) with MODTRAN 3.7 indicates an agreement within
-0.4% in the visible spectral range (415-585 nm), -1.6% within
the 370-415 nm, and -5.7% within 325-370 nm wavelength interval, in agreement
with the results of the other sensors. In agreement with
findings of Skupin et al. (2002) our study emphasizes that the
present ESA SCIAMACHY level 1 calibration is systematically +15%
larger in the considered wavelength intervals when compared to all
available other solar irradiance measurements. |
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