CLIMATE

Home Funding Calls for proposals Better understanding and attribution of land and ocean carbon sources and sinks Better understanding and attribution of land and ocean carbon sources and sinks HORIZON-CL5-2027-01-D1-12 Topic Call for proposal Internal navigation General information Topic description Destination Conditions and documents Budget overview Partner search announcements Start submission Topic Q&As Get support General information Programme Horizon Europe (HORIZON) Call CLIMATE (HORIZON-CL5-2027-01) Type of action HORIZON-RIA HORIZON Research and Innovation Actions Type of MGA HORIZON Lump Sum Grant [HORIZON-AG-LS] Forthcoming Deadline model single-stage Planned opening date 17 November 2026 Deadline date 04 March 2027 17:00:00 Brussels time Topic description Expected Outcome: Project results are expected to contribute to some of the following expected outcomes: Better understanding of oceanic carbon dioxide (CO2) sources and sinks, their drivers and dynamics under different climate scenarios, including their responses to human interventions; Better understanding of land ecosystem CO2 sources and sinks, their drivers (both natural and anthropogenic) and their evolution under future climate and land-based mitigation scenarios; Progress on reconciling estimates of anthropogenic CO2 emissions and removals from land originating from the climate science and national emissions reporting communities; More consistent representation and quantification of lateral transfers of carbon. Scope: Understanding the mechanisms and drivers of land (including inland waters) and ocean carbon sinks and sources is crucial for accurate climate models and scenarios and informing climate mitigation strategies. However, significant gaps and uncertainties remain in quantifying these complex processes and their components. It is essential to better understand the roles of anthropogenic and natural drivers of carbon fluxes, in particular the surface-to-air flux. This is necessary for reconciling conceptual discrepancies among estimates and assessing the implications for future trends and mitigation potential, taking into account that mitigation actions need to be additional to natural processes and business-as-usual and that the remaining carbon budget depends, inter alia, on assumptions on sinks. Proposals are expected to address only one of the three areas identified below - which should be clearly indicated, while ensuring coordination and cooperation across projects to address consistency in key factors, such as data, scenarios and models used or the representation of lateral transport of carbon (e.g., through river transport or harvest). Selected proposals may consider the involvement of the European Commission's Joint Research Centre (JRC) whose contribution could consist of scientific advice, specialised analytical expertise and data. This topic is part of a coordination initiative between ESA and the European Commission on Earth System Science (ESSI) under the Carbon Cluster. Successful consortia will be asked to coordinate with projects that will be selected under ESA’s FutureEO programme to facilitate access to and uptake of satellite data products and related tools or methodologies. To this end, proposals should foresee sufficient means for effective coordination (i.e. cluster meetings, joint data management, potential joint actions). International cooperation is generally encouraged, in particular with low and lower/upper-middle-income countries[1]. Area A: Oceanic CO2 sources and sinks The ocean’s capacity to act as a carbon sink is determined by a variety of factors, including changes in climate, atmospheric composition (in particular CO2 concentration) and chemical, physical and biological processes of the ocean, all influenced by human activities. Projects are expected to improve the understanding and quantification of the various mechanisms involved, with a focus on the behaviour of the ocean sink under past (including palaeo records), present and future conditions and various climate change and emission scenarios. The projects should contribute to a better understanding of the biophysical potential for marine mitigation approaches (in particular carbon dioxide removal) and their implications over relevant timeframes, including feedbacks. The analysis should also include responses to ambitious mitigation (e.g., atmospheric stabilisation in line with policy objectives). Projects should build on the results of related earlier projects, in particular those under call HORIZON-CL6-2022-CLIMATE-01-02. Area B: Land CO2 sources and sinks Currently, land ecosystems globally represent a significant net carbon sink, driven by natural processes greatly perturbed by a variety of human influences, including past and present land management practices, increasing atmospheric CO2 concentrations, nitrogen deposition and climate change itself. They are also a significant source of anthropogenic greenhouse gas emissions. Natural responses to environmental change and management effects overlap and interact in space and time, making the isolation of different factors (natural and anthropogenic) challenging or even impossible. Projects will aim to further our understanding of the key factors that have driven land carbon fluxes in the past and improving their quantification under present conditions and facilitating their projection under relevant climate and land use scenarios. Area C: Reconciliation of different land use CO2 emission estimates The climate science and national emissions reporting communities have historically used different interpretations of anthropogenic land-based CO2 emissions and removals, leading to varying estimates with significant policy implications for assessing climate progress. It is crucial to reconcile these definitions with due consideration for lateral transfers of carbon to ensure comparability across global, regional, and national scales, to foster integration between different expert communities and approaches and to support policy negotiations and decision-making approaches. Through innovative approaches, the projects should enhance confidence in land-use CO2 flux estimates and enable more accurate assessments of national and collective climate progress, as well as alternative land-based climate policy options. [1] https://datahelpdesk.worldbank.org/knowledgebase/articles/906519-world-bank-country-and-lendinggroups; standard Horizon Europe funding rules apply - only participants from some of these countries are automatically eligible for funding Show more Topic destination Advancing science for a fair transition to a climate-neutral and resilient society (2026-27) This Destination contributes directly to the Strategic Plan’s Key Strategic Orientations ‘Green transition’, ‘Digital transition’ and ‘A more resilient, competitive, inclusive and democratic Europe’. In line with the Strategic Plan, the overall expected impact of this Destination is to contribute to the “Advancing science for a transition to a climate-neutral and resilient society”. Expected impacts: Research should contribute to closing major knowledge gaps on the changing climate together with their associated impacts and risks, on both society and nature. It should also help develop tools to support decision-makers in designing and implementing effective mitigation and adaptation actions at various time and spatial scales while properly accounting for synergies and trade-offs with other policy objectives, such as just transition, territorial cohesion and leaving no one behind. The main impacts to be generated by topics under this Destination are: Supporting climate action (both mitigation and adaptation) in Europe and globally, through advancing climate science and the knowledge base underpinning actionable solutions, to accelerate the transition to a climate-neutral, climate-resilient and prosperous society. Closing key knowledge gaps related to climate change, thereby contributing substantially to key European and international assessments such as IPCC, IPBES, EUCRA, and other initiatives such as the Coupled Model Intercomparison Project (CMIP) and the Coordinated Regional Climate Downscaling Experiment (CORDEX) under the World Climate Research Programme. Strengthening the European Research Area on climate change by boosting scientific excellence and capacity in an inclusive manner across the participating countries. Maximising synergies between mitigation and adaptation and with other policy priorities such as biodiversity and ecosystem preservation and restoration, disaster-preparedness, digitalisation, circular economy, prosperity and competitiveness, strategic autonomy, security and resilience, just transition, and the Sustainable Development Goals by exploring co-benefits, trade-offs and potential unintended consequences of climate strategies and policy interventions. Important components of climate science research are also addressed in other Clusters -particularly Cluster 6 – which addresses the climate-ocean-cryosphere-polar nexus and the climate-energy-land-food-water-biodiversity nexus. Efforts to foster synergies and complementarities across these research activities are strongly encouraged. Show more Topic conditions and documents General conditions 1. Admissibility Conditions: Proposal page limit and layout described in Annex A and Annex E of the Horizon Europe Work Programme General Annexes. Proposal page limits and layout: described in Part B of the Application Form available in the Submission System. 2. Eligible Countries described in Annex B of the Work Programme General Annexes. A number of non-EU/non-Associated Countries that are not automatically eligible for funding have made specific provisions for making funding available for their participants in Horizon Europe projects. See the information in the Horizon Europe Programme Guide. 3. Other Eligible Conditions If projects use satellite-based earth observation, positioning, navigation and/or related timing data and services, beneficiaries must make use of Copernicus and/or Galileo/EGNOS (other data and services may additionally be used). The Joint Research Centre (JRC) may participate as member of the consortium selected for funding as a beneficiary with zero funding, or as an associated partner. The JRC will not participate in the preparation and submission of the proposal - see General Annex B. described in Annex B of the Work Programme General Annexes. 4. Financial and operational capacity and exclusion described in Annex C of the Work Programme General Annexes. 5a. Evaluation and award: Award criteria, scoring and thresholds To ensure a balanced portfolio covering different research areas (A, B and C), grants will be awarded to applications not only in order of ranking, but also to at least two highest ranked applications in each of areas A and B and at least one in Area C, provided that the corresponding applications attain all thresholds. are described in Annex D of the Work Programme General Annexes. 5b. Evaluation and award: Submission and evaluation processes are described in Annex F of the Work Programme General Annexes and the Online Manual. 5c. Evaluation and award: Indicative timeline for evaluation and grant agreement described in Annex F of the Work Programme General Annexes. 6. Legal and financial set-up of the grants Beneficiaries will be subject to the following additional obligations regarding open science practices: Open access to any new modules, models or tools developed from scratch or substantially improved with the use of EU funding under the action must be ensured through documentation, availability of model code and input data developed under the action. Eligible costs will take the form of a lump sum as defined in the Decision of 7 July 2021 authorising the use of lump sum contributions under the Horizon Europe Programme – the Framework Programme for Research and Innovation (2021-2027) – and in acti [... συνέχεια στην επίσημη πρόσκληση]