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| Titel |
Photosynthetic parameters in the Beaufort Sea in relation to the phytoplankton community structure |
| VerfasserIn |
Y. Huot, M. Babin, F. Bruyant |
| 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. 5 ; Nr. 10, no. 5 (2013-05-29), S.3445-3454 |
| Datensatznummer |
250018261
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| Publikation (Nr.) |
 copernicus.org/bg-10-3445-2013.pdf |
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| Zusammenfassung |
| To model phytoplankton primary production from remotely sensed data, a method
to estimate photosynthetic parameters describing the photosynthetic rates
per unit biomass is required. Variability in these parameters must be
related to environmental variables that are measurable remotely. In the
Arctic, a limited number of measurements of photosynthetic parameters have
been carried out with the concurrent environmental variables needed. Such
measurements and their relationship to environmental variables will be
required to improve the accuracy of remotely sensed estimates of
phytoplankton primary production and our ability to predict future changes.
During the MALINA cruise, a large dataset of these parameters was obtained.
Together with previously published datasets, we use environmental and
trophic variables to provide functional relationships for these parameters.
In particular, we describe several specific aspects: the maximum rate of
photosynthesis (Pmaxchl) normalized to chlorophyll
decreases with depth and is higher for communities composed of large cells;
the saturation parameter (Ek) decreases with depth but is independent of
the community structure; and the initial slope of the photosynthesis versus
irradiance curve (αchl) normalized to chlorophyll is independent
of depth but is higher for communities composed of larger cells. The
photosynthetic parameters were not influenced by temperature over the range
encountered during the cruise (−2 to 8 °C). |
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