CESIMAR - CENPAT   25625
CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
VALDES BIOSPHERE RESERVE: WHAT DO THE LAST 20 YEARS OF SATELLITE DATA TELL US ABOUT PHYTOPLANKTON AND OPTICAL PROPERTIES?
Autor/es:
WILLIAMS, GABRIELA; NOCERA, ARIADNA CELINA
Reunión:
Congreso; ASLO virtual meeting; 2021
Resumen:
Chlorophyll-a (Chla-sat, as a proxy for phytoplankton biomass) and their relations with the main inherent optical properties (IOPs) have been examined in the surface waters of the Valdés Biosphere Reserve (VBR, UNESCO 2014). The VBR is an important protected area for marine conservation, which encompasses the Nuevo (GN) and San José(SJG) gulfs, where data of sea water properties are scarce. We compare Chla-sat and the optical environment of the two gulfs separately as they differ in their dynamics, sizes and bottom depths.To achieve our objective time series (2003-2020) of satellite images of Chla-sat, IOPs, photosynthetically available radiation (PAR), euphotic depth (Z1%) and sea surface temperature (SST), were analyzed. We found significant seasonal and interannual variability with some particular years standing out from the rest. Time series tendency showed an increase in both Gulfs for the phytoplankton absorption (+0.02 and +0.01), PAR (+1.61 and +1.88) and SST(+0.56 and +0.37). In both gulfs, light absorption was dominated by debris and organic matter, but GN presented higher absorption by phytoplankton than SJG.Direct applications of this work includes its use as support for early detection of changes in water properties as well as the designing for sampling strategies, ocean modelling, interpreting environmental and biological patterns providing an ecosystem-based management.