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Towards carbon neutrality by 2040 in La Rochelle metropolitan area (France): quantifying the role of wetlands and littoral zone in the capture and sequestration of blue carbon

Christine Dupuy 1, * Hélène Agogué 1 Benjamin Amann 1 Frédéric Azémar 2 Nicolas Becu 1 Lauriane Bergeon 1 Xavier Bertin 1 Pierrick Bocher 1 Emilie Bout 3 Isabelle Brenon 1 Alexandre Carpentier 4, 5 Serge Ceaux 3 Eric Chaumillon 1 Catherine Choquet 6 Béatrice Colin 1 Jonathan Deborde 7, 8 Emmanuel Dubillot 1 Emery Claire 1 Sylvie Ferrari 9 Cédric Gaucherel 10 Philippe Geairon 7, 8 Stéphane Gilbert 3 Marc Jeannin 11 J. Jourde 1 Dimitri Kalenitchenko 1 Nicolas Lachaussée 1 Thomas Lacoue-Labarthe 1 Isabelle Lanneluc 1 Laura Lavaud 1 Sébastien Lavaud 9 Christel Lefrançois 1 Vincent Le Fouest 1 Inès Le Fur 7 Nathalie Long 1 Pierre-Yves Mahieux 11 Jérémy Mayen 7 Caroline Marais 1, 11 Édouard Metzger 12 Raphaël Moncelon 1 Vincent Ouisse 13 Jean-Christophe Péreau 9 Julien Pétillon 14, 15 Olivier Philippine 16 Philippe Pineau 1 Cécilia Pignon-Mussaud 1 Pierre Polsenaere 7 René Sabot 11 Philippe Refait 11 Elodie Réveillac 1 François-Xavier Robin 16 Hélène Rouquette 17 Sophie Sablé 1 Pierre-Guy Sauriau 1 Michèle Tackx 2 Philippe Turcry 11 Marie Vagner 18 Julia Vincent 1 Natacha Volto 1 
Abstract : Rising greenhouse gas emissions are causing increasing worldwide impacts and changes on climate patterns, sea level, food production, human lives and livelihoods. Maintaining or improving the ability of coastal aquatic ecosystems and oceans to remove CO2 from the atmosphere is a crucial aspect for climate mitigation. The vegetated coastal ecosystems are able to catch and to sequestrate carbon, the so-called Blue Carbon. These ecosystems are key exchange zones that mediate the biogeochemical cycles across the continent, the ocean and the atmosphere. Given the importance of these ecosystems in biogeochemical cycles and their sensitivity to natural and anthropogenic pressures, the carbon cycle within and between compartments (e.g. pelagos, benthos…) and across the interfaces (e.g. atmosphere, ocean…) need to be addressed. On a regional scale, in the extended urban area of La Rochelle located on the French Atlantic coast (La Rochelle metropolitan area), lack in situ measurements within the wetlands and littoral zone make very uncertain their role as a sink or a source of CO2 to the atmosphere. We will first present a vast research project “La Rochelle Territoire Zéro Carbone” project (, that target the ambition of carbon neutrality in La Rochelle metropolitan area by 2040 through a holistic approach (from measuring CO2 to raising people's awareness and assessing the impact of exogenous natural factors). Second, we will present some first results on the Blue Carbon dynamics within the freshwater and salt marshes, and seagrasses.
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Submitted on : Wednesday, September 14, 2022 - 6:38:06 PM
Last modification on : Friday, September 23, 2022 - 4:48:29 PM


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  • HAL Id : hal-03777579, version 1


Christine Dupuy, Hélène Agogué, Benjamin Amann, Frédéric Azémar, Nicolas Becu, et al.. Towards carbon neutrality by 2040 in La Rochelle metropolitan area (France): quantifying the role of wetlands and littoral zone in the capture and sequestration of blue carbon. ECSA 59 Using the best scientific knowledge for the sustainable management of estuaries and coastal seas, Sep 2022, San Sebastian, Spain. 2022. ⟨hal-03777579⟩



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