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| Titel |
A synthesis of light absorption properties of the Arctic Ocean: application to semianalytical estimates of dissolved organic carbon concentrations from space |
| VerfasserIn |
A. Matsuoka, M. Babin, D. Doxaran, S. B. Hooker, B. G. Mitchell, S. Bélanger, A. Bricaud |
| 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 ; 11, no. 12 ; Nr. 11, no. 12 (2014-06-16), S.3131-3147 |
| Datensatznummer |
250117465
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| Publikation (Nr.) |
 copernicus.org/bg-11-3131-2014.pdf |
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| Zusammenfassung |
| In addition to scattering coefficients, the light absorption coefficients of
particulate and dissolved materials are the main factors determining the
light propagation of the visible part of the spectrum and are, thus,
important for developing ocean color algorithms. While these absorption
properties have recently been documented by a few studies for the Arctic
Ocean (e.g., Matsuoka et al., 2007, 2011; Ben Mustapha et al., 2012), the
data sets used in the literature were sparse and individually insufficient to
draw a general view of the basin-wide spatial and temporal variations in
absorption. To achieve such a task, we built a large absorption database of
the Arctic Ocean by pooling the majority of published data sets and merging
new data sets. Our results show that the total nonwater absorption
coefficients measured in the eastern Arctic Ocean (EAO; Siberian side) are
significantly higher than in the western Arctic Ocean (WAO; North American
side). This higher absorption is explained by higher concentration of
colored dissolved organic matter (CDOM) in watersheds on the Siberian side,
which contains a large amount of dissolved organic carbon (DOC) compared to
waters off North America. In contrast, the relationship between the
phytoplankton absorption (aϕ(λ)) and chlorophyll a (chl
a) concentration in the EAO was not significantly different from that in the
WAO. Because our semianalytical CDOM absorption algorithm is based on chl
a-specific aϕ(λ) values (Matsuoka et al., 2013), this
result indirectly suggests that CDOM absorption can be appropriately derived
not only for the WAO but also for the EAO using ocean color data. Based on
statistics, derived CDOM absorption values were reasonable compared to in situ
measurements. By combining this algorithm with empirical DOC versus CDOM
relationships, a semianalytical algorithm for estimating DOC concentrations
for river-influenced coastal waters of the Arctic Ocean is presented and
applied to satellite ocean color data. |
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