Interannual variability of the initiation of the phytoplankton growing period in two French coastal ecosystems

Type Article
Acceptance Date 2022-01 IN PRESS
Language English
Author(s) Poppeschi ColineORCID1, Charria GuillaumeORCID1, Daniel Anne2, Verney Romaric3, Rimmelin-Maury Peggy4, Retho Michael5, Goberville Eric6, Grossteffan Emilie4, Plus Martin2
Affiliation(s) 1 : Ifremer, Univ. Brest, CNRS, IRD, Laboratory for Ocean Physics and Satellite remote sensing (LOPS), IUEM, 29280 Brest, France
2 : Ifremer, DYNECO, Pelagic Ecology Laboratory (PELAGOS), 29280 Brest, France
3 : Ifremer, DYNECO, Hydrosedimentary Dynamics Laboratory (DHYSED), 29280 Brest, France
4 : OSU-European University Institute of the Sea (IUEM), UMS3113, 29280 Plouzané, France
5 : Ifremer, Morbihan-Pays de Loire Environment Resources Laboratory (LERMPL), 56100 Lorient, France
6 : Unité Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), Muséum National d’Histoire Naturelle, CNRS, IRD, Sorbonne Université, Université de Caen Normandie, Université des Antilles, Paris, France
Source Biogeosciences (1726-4189) (Copernicus GmbH) In Press
DOI 10.5194/bg-2022-86
Note Special issues Towards an understanding and assessment of human impact on coastal marine environments Editor(s): Ulrike Braeckman, Jan Vanaverbeke, Gert Van Hoey, and Marilaure Grégoire

Abstract. Decadal time series of chlorophyll-a concentrations sampled at high and low frequencies are explored to study climate-induced changes on the processes inducing interannual variations in the Initiation of the Phytoplankton Growing Period (IPGP) in early spring. In this study, we specifically detail the IPGP in two contrasting French coastal ecosystems: the Bay of Brest and the Bay of Vilaine. A large interannual variability in the IPGP is observed in both ecosystems in connection with variations of environmental drivers (solar radiation, sea temperature, wind direction and intensity, precipitation, river flow, sea level, currents and turbidity). We show that the IPGP is delayed by around 30 days in 2019 in comparison with 2010. The use of a one-dimensional vertical model coupling hydrodynamics, biogeochemistry and sediment dynamics shows that the IPGP is generally dependent on the interaction between several drivers. Interannual changes are therefore not associated with a unique driver (such as increasing sea surface temperature). Extreme events also impact the IPGP. In both bays, IPGP is sensitive to cold spells and flood events. The interannual variability of the IPGP is significant and strongly conditioned, at the local scale, by a combination of several environmental parameters, with a larger sensitivity to sea temperature and light conditions, linked to the turbidity of the system. While both bays are hydrodynamically contrasted, the processes that modulate IPGP are similar. Keywords Phytoplankton biomass, Long-term in situ observations, Coastal ecosystems, Extreme events, Climate change.

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Poppeschi Coline, Charria Guillaume, Daniel Anne, Verney Romaric, Rimmelin-Maury Peggy, Retho Michael, Goberville Eric, Grossteffan Emilie, Plus Martin Interannual variability of the initiation of the phytoplankton growing period in two French coastal ecosystems. Biogeosciences IN PRESS. Publisher's official version : , Open Access version :