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Proceedings Paper

Variations in the water column photosynthetic cross section for Antarctic coastal waters
Author(s): Herve Claustre; Mark Moline; Barbara Prezelin
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Paper Abstract

Using a highly resolved LTER database collected near Palmer Station, Antarctica, from 1991-1994, the variability in the column photosynthetic cross section ((Psi) , m2, g Chl a-1) was analyzed. For the whole dataset, (Psi) had an average value of 0.0695 m2 g Chl a-1 but extreme values extended over a 50-fold range. A six-fold variation in (Psi) was observed with time of year and was strongly associated with the high seasonality in incident irradiance characteristic of these polar sampling sties. Variability in daily incident irradiance as influenced by cloudiness and variation in chlorophyll content were responsible for an additional two-fold variation in (Psi) . Finally, the taxonomic dependency of (Psi) was demonstrated for the first time. For identical chlorophyll content and surface irradiance, mean (Psi) value of 0.114 +/- 0.051 m2 g Chl a-1 were recorded for diatom blooms and 0.052 +/- 0.011 m2 g Chl a-1 for cryptophyte- dominated populations. Results illustrate the validity of (Psi) -based approaches for estimating primary production for the Southern Ocean but emphasize the need to address taxon- specific photophysiology to better estimate primary production on smaller spatio-temporal scales.

Paper Details

Date Published: 6 February 1997
PDF: 4 pages
Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); doi: 10.1117/12.266412
Show Author Affiliations
Herve Claustre, Univ. of California/Santa Barbara (United States)
Univ. Pierre et Marie Curie (France)
Mark Moline, Univ. of California/Santa Barbara (United States)
Barbara Prezelin, Univ. of California/Santa Barbara (United States)

Published in SPIE Proceedings Vol. 2963:
Ocean Optics XIII
Steven G. Ackleson; Robert J. Frouin, Editor(s)

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