INVESTIGADORES
LUTZ Vivian Alicia
congresos y reuniones científicas
Título:
Improving the estimation of primary production using remote sensing data in the Argentine continental shelf and shelf-break regions
Autor/es:
DOGLIOTTI, A.I.; LUTZ, V.A.; SEGURA, V.
Lugar:
Liege
Reunión:
Otro; The 45th International Liege Colloquium - Primary production in the ocean: from the synoptic to the global scale; 2013
Institución organizadora:
University of Liege
Resumen:
In order to
estimate primary production on a synoptic scale using satellite information,
four methods were tested to assign photosynthetic parameters that characterize
the photosynthesis?irradiance relationships: (1) the nearest neighbor method
(NNM), (2) static and, (3) dynamic partition into biogeochemical regions, and
(4) average values of measured parameters. The required photosynthetic
parameters were obtained during three oceanographic cruises conducted in the
Argentine shelf and shelf-break regions during spring 2005, summer and winter
2006 by performing photosynthesis-light incubation experiments. Despite some
variations in the performance according to the season, the NNM and the use of
dynamic provinces emerged as the preferred methods for parameter assignment.
Composite synoptic maps of primary production for each cruise were calculated,
showing a high spatial variability within the region. Seasonal variability in
the primary production for the whole continental shelf and for selected
ecologically relevant regions, such as the shelf-break, were extracted from monthly
images of primary production computed over an annual cycle using MODIS-Aqua
derived chlorophyll-a concentration. The high mean primary production
estimated over the shelf-break showed values comparable to other well-known
productive zones of the world oceans, such as the Benguela system. A first
estimation of the total amount of carbon fixed in the shelf-break area showed
that the annual production of the Argentine shelf and shelf-break regions
represent a large percentage of the mean production of the global ocean. Results
will be compared to those obtained by previous global estimations for this
region.