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| Titel |
Estimating absorption coefficients of colored dissolved organic matter (CDOM) using a semi-analytical algorithm for southern Beaufort Sea waters: application to deriving concentrations of dissolved organic carbon from space |
| VerfasserIn |
A. Matsuoka, S. B. Hooker, A. Bricaud, B. Gentili, M. Babin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 2 ; Nr. 10, no. 2 (2013-02-08), S.917-927 |
| Datensatznummer |
250017509
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| Publikation (Nr.) |
 copernicus.org/bg-10-917-2013.pdf |
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| Zusammenfassung |
| A series of papers have suggested that freshwater discharge, including a
large amount of dissolved organic matter (DOM), has increased since the
middle of the 20th century. In this study, a semi-analytical algorithm for
estimating light absorption coefficients of the colored fraction of DOM
(CDOM) was developed for southern Beaufort Sea waters using remote sensing
reflectance at six wavelengths in the visible spectral domain corresponding
to MODIS ocean color sensor. This algorithm allows the separation of colored
detrital matter (CDM) into CDOM and non-algal particles (NAP) through the
determination of NAP absorption using an empirical relationship between NAP
absorption and particle backscattering coefficients. Evaluation using
independent datasets, which were not used for developing the algorithm, showed
that CDOM absorption can be estimated accurately to within an uncertainty of
35% and 50% for oceanic and coastal waters, respectively. A
previous paper (Matsuoka et al., 2012) showed that dissolved organic carbon
(DOC) concentrations were tightly correlated with CDOM absorption in our
study area (r2 = 0.97). By combining the CDOM absorption algorithm
together with the DOC versus CDOM relationship, it is now possible to
estimate DOC concentrations in the near-surface layer of the southern
Beaufort Sea using satellite ocean color data. DOC concentrations in the
surface waters were estimated using MODIS ocean color data, and the estimates
showed reasonable values compared to in situ measurements. We propose a
routine and near real-time method for deriving DOC concentrations from space,
which may open the way to an estimate of DOC budgets for Arctic coastal
waters. |
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