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| Titel |
Spectral studies of ocean water with space-borne sensor SCIAMACHY using Differential Optical Absorption Spectroscopy (DOAS) |
| VerfasserIn |
M. Vountas, T. Dinter, A. Bracher, J. P. Burrows, B. Sierk |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 3, no. 3 ; Nr. 3, no. 3 (2007-09-26), S.429-440 |
| Datensatznummer |
250001101
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| Publikation (Nr.) |
 copernicus.org/os-3-429-2007.pdf |
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| Zusammenfassung |
| Methods enabling the retrieval of oceanic parameter from the
space borne instrumentation Scanning Imaging Absorption Spectrometer
for Atmospheric ChartographY (SCIAMACHY) using Differential Optical
Absorption Spectroscopy (DOAS) are presented. SCIAMACHY onboard
ENVISAT measures back scattered solar radiation at a spectral
resolution (0.2 to 1.5 nm). The DOAS method was used for the first
time to fit modelled Vibrational Raman Scattering (VRS) in liquid
water and in situ measured phytoplankton absorption reference spectra
to optical depths measured by SCIAMACHY. Spectral structures of VRS
and phytoplankton absorption were clearly found in these optical
depths. Both fitting approaches lead to consistent
results. DOAS fits correlate with estimates of chlorophyll
concentrations: low fit factors for VRS retrievals correspond to large
chlorophyll concentrations and vice versa; large fit factors for
phytoplankton absorption correspond with high chlorophyll
concentrations and vice versa. From these results a simple
retrieval technique taking advantage of both measurements is shown.
First maps of global chlorophyll concentrations were compared to the
corresponding MODIS measurements with very promising results.
In addition, results from this study
will be used to improve atmospheric trace gas DOAS-retrievals from
visible wavelengths by including these oceanographic signatures. |
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