Keynotes highlights included the presentation of Rona Thompson (from NILU) illustrating the CO2 Net Ecosystem Exchange in Europe during the 2018 Drought (recently published). This study and several others illustrate how water cycle anomalies are intertwined with the carbon cycle and will require high accuracy for both the natural and anthropogenic components. The talk of Erik Anderson (from the European Commission Directorate-General for Defence Industry and Space - DG-DEFIS) presented how Copernicus moves forward with monitoring human carbon dioxide emissions with particular emphasis on the role of in-situ observations, such as those coordinated within ICOS-ERIC. 

Thomas Lauvaux (from LSCE) illustrated how  constraining continental carbon exchanges using atmospheric greenhouse gas mixing ratios will permit to reduce uncertainty, a topic which will be further explored in the follow-on of CHE, the CoCO2 project starting in January 2021.

Several of the leading scientist coordinating CHE work-packages actively contributed to the conference (below Dominik Brunner (from EMPA), Maarten Krol (from WUR) and Marko Scholze (from ULund)). They will also be among key actors in CoCO2 project, for the definition of the multi-scale (global-regional-local) CO2 monitoring prototype, which is on-track for 2023.

CHE project work featured also in orals & posters presentations as detailed below:

• Dellaert al. : Compiling a more complete inventory of public power and heat plant point source emissions in the EU  
• Kaminski et al. Assessing the constraint of the CO2 monitoring mission on fossil fuel emissions from power plants and a city in a regional carbon cycle fossil fuel data assimilation system 
• Scholze et al. Assessments of in situ and remotely sensed CO₂ observations in a Carbon Cycle Fossil Fuel Data Assimilation System to estimate fossil fuel emissions 
• Agusti-Panareda et al. : Using ICOS flux data to estimate prior uncertainty and its impact on simulated variability of atmospheric CO2
• Super et al. : Uncertainties in a high-resolution gridded emission map and the importance for urban scale emission verification 

From All of the CHE project we wish to congratulate our ICOS colleagues for organising an impressive science conference online, that has been also trending in social media #ICOS2020SC!