INVESTIGADORES
PEREZ Gonzalo Luis
congresos y reuniones científicas
Título:
LINKING DISSOLVED ORGANIC MATTER OPTICAL PROPERTIES WITH PHYTOPLANKTON COMPOSITION IN CONTRASTING ENVIRONMENTAL CONDITIONS OF THE SOUTHERN OCEAN
Autor/es:
CABRERA-BRUFAU, M.; ORTEGA_RETUERTA, E.; PÉREZ G. L.; SIMO, R. ; MARRASÉ, C.
Lugar:
Virtual
Reunión:
Congreso; ASLO 2021 Aquatic Sciences Meeting (2021); 2021
Institución organizadora:
ASLO
Resumen:
Dissolved organic matter (DOM) comprises the largest reservoir of organic C in the oceans and its cycling is of uttermost importance for the ocean-atmosphere C balance. The identity and state of phytoplankton, the main producers of DOM in the open ocean, can determine not only the quantity, but also the quality of DOM. Optical properties have been used to determine the quality of DOM, and in particular, indices combining fluorescence signals have been applied to distinguish different fractions in terms of DOM lability. Understanding the influence of plankton composition on DOM lability is critical to predict how global change, by altering the plankton composition, may affect DOM lability and therefore the fate of the organic carbon produced. During the austral summer of 2015, as part of the Southern Ocean PEGASO cruise, we visited four distinct phytoplankton proliferations and monitored their evolution using a Langrangian approach for 2-5 days, including one 4h-frequency day-night sampling cycle in each of them. We characterized the composition of fluorescent dissolved organic matter (FDOM) through spectroscopy and the phytoplankton composition by means of microscopic observations and HPLC pigment analysis. The exhaustive sampling strategy applied allowed us to follow the bloom dynamics of each of the four regions and identify concurrent changes in DOM optical properties. We will compare the data of this study with previous experimental results and discuss the importance of our findings in the context of carbon cycle