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Trouble in the air: How European forests keep their cool under atmospheric drought

Project description

Forest resilience to environmental changes

The 21st century has seen more frequent heatwaves in Europe, linked to increased vapour pressure deficit (VPD), and resulting in atmospheric droughts. These conditions harm plant water relations, reduce carbon capacity, and cause tree mortality. We aim to study how European forests respond to these environmental changes. The ERC-funded COOL project aims to explore tree tolerance to temperature and VPD using advanced experiments and a European monitoring network. It aims to understand the impacts of temperature, VPD, and soil moisture on forest growth and mortality. By collecting high-resolution data, the project will provide insights into forest resilience, inform climate-smart management, and address the effects of droughts on ecosystems.

Objective

The 21st century has witnessed a steady rise in the frequency and intensity of heatwaves, creating unprecedented challenges for ecosystems. Europe, in particular, has experienced its hottest heatwaves in the past two decades, increasingly coupled with elevated vapor pressure deficit (VPD)—the atmospheric demand for water—resulting in a new form of “atmospheric droughts.” These droughts disrupt plant water relations, diminish carbon sink capacity, and trigger large-scale tree mortality. Our overarching goal is to unravel how European forests respond to rising VPD and temperature, their extremes, and compounding soil drought effects. COOL integrates innovative methodologies, including state-of-the-art laboratory experiments, the first-ever VPD manipulation in a natural forest, a pan-European monitoring network, and advancements in mechanistic modeling. We will (1) systematically assess what drives trees’ thermal and VPD tolerance, an area previously unexplored but crucial for predicting forest resilience; (2) disentangle, for the first time, the impacts of temperature, VPD, and soil moisture in natural settings—an achievement made possible by novel methodological developments; (3) investigate the role of long-term acclimation to temperature and VPD under varying soil moisture scenarios, leveraging unprecedented experimental infrastructure; and (4) quantify the consequences for forest growth, water use, and tree mortality. By combining cutting-edge approaches to collect high-resolution hydraulic and thermal data, COOL overcomes a critical bottleneck in forest research. The project will deliver groundbreaking insights into forest resilience under future climates. These results will advance climate-smart forest management, inform policy frameworks, equip stakeholders with actionable tools, and foster education in global change ecology. COOL will establish new paradigms for predicting and mitigating the long-term consequences of atmospheric droughts on forest ecosystems.

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Call for proposal

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(opens in new window) ERC-2025-COG

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Host institution

ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 1 997 365,00
Address
BATIMENT CE 3316 STATION 1
1015 LAUSANNE
Switzerland

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Region
Schweiz/Suisse/Svizzera Région lémanique Vaud
Activity type
Higher or Secondary Education Establishments
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Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

€ 1 997 365,00

Beneficiaries (1)

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