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Mesoscale control of winter-spring primary production in the deep convection region of the NW Mediterranean

AuthorsEstrada, Marta ; Salat, Jordi ; Emelianov, Mikhail ; Latasa, Mikel
Issue Date26-Nov-2013
CitationIntegrating New Advances in Mediterranean Oceanography and Marine Biology. Meeting program: 13 (2013)
AbstractAlthough the phytoplankton bloom in the Liguro-Provençal deep convection region represents one of the main fertilization mechanisms in the Mediterranean, most in situ measurements of primary production have been concentrated in the Ligurian side of the basin, and data are scarce in the southwestern part of the divergence area. This communication examines primary production (PP) experiments (using the 14C method) from four cruises carried out in the region during March-April 2005 (EFLUBIO proejct) and during April, May and September 2009 (FAMOSO project). Our aims were to constrain PP estimates in the area and to ascertain the importance of mesoscale spatio-temporal variability on the photosynthetic response of the phytoplankton assemblages during the bloom and post-bloom periods. Chlorophyll a (Chl a) concentrations at 5 m depth reached 7 mg m-3 on 25 March 2005, one of the highest values measured in the region; average surface values ranged from approximately 2 mg m-3 in the March cruises to 0.1 mg m-3 in September. Vertically- integrated (0-80 m) PP (PPint) reached 1800 mg C m-2 in March 2009, with an average of around 1000 mg C m-2 and decreased to a mean of 145 mg C m-2 in September 2009. These results confirm previous results indicating a relationship between irradiance and the ratio PPint:Integrated Chl a concentration. Superimposed to the seasonal trends, there was a considerable within-cruise variability of the biomass and production variables. Some of the changes in PP could be accounted for by daily fluctuations in irradiation, but an important contributor to within-cruise variability was mesoscale hydrographic heterogeneity and associated biological changes at the sampling point, in particular during winter and spring. Potential mechanisms underlying these effects are discussed
DescriptionSymposium on Integrating New Advances in Mediterranean Oceanography and Marine Biology, 26-29 November 2013, Institut de Ciències del Mar (CSIC), Barcelona, Catalunya, Spain
Publisher version (URL)http://www.icm.csic.es/bio/medocean/information.htm#schedule
Appears in Collections:(ICM) Comunicaciones congresos
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