The ICOS France Science day 2021

The winter heat wave in February 2020, followed by the reduction in greenhouse gas emissions due to COVID 19 lock-down, a new drought and several hot days during last summer, and a new period of near-universal lock-down during the winter of 2021 are unpredictable and historically unprecedented events that affect the atmospheric greenhouse gas budget. They highlight the critical importance of accurate, distributed, real-time measurements of the surface carbon cycle. The ICOS France research infrastructure, its laboratories and data processing centres, and the network of stations it deploys in the atmosphere, ocean surface waters, and on major types of continental ecosystems, responds well to this challenge today. The ICOS France Open Science Days, organized in Reims from October 12th to 14th, 2021, will present the latest research and data on the carbon cycle and on the impacts of rare events. Four speakers will inaugurate the open presentation sessions. The latest report of the G.I.E.C. Working Group I (Valérie Masson, WGI co-chair), carbon in surface waters from source to ocean (Richard Sanders, head of the Ocean thematic centre), the coupling of carbon and nitrogen cycles (Mark Sutton, Centre for Ecology and Hydrology) and inversion approaches for determining surface fluxes (Frédéric Chevallier, L.S.C.E.) will be presented. These days will be organized to minimize its fossil carbon emissions with the involvement of the hotel school of Reims