Description du projet
Cartographie des sources de composés organiques volatils dans l’Arctique
Notre atmosphère est sous l’influence constante des composés organiques volatils (COV). Émis par les organismes biologiques et différentes activités anthropiques, ces gaz peuvent entraîner la formation ou l’appauvrissement de l’ozone. Mais dans l'Arctique, le facteur à l’origine de l’émission et de l’absorption de nombreux COV communs demeure un mystère. Le projet ELATE, financé par l’UE, entend mettre en lumière ces sources et ces puits et recourir à la modélisation pour quantifier l’incidence de l’augmentation du CO2 atmosphérique et des facteurs biologiques sur celles-ci. La compréhension des changements au niveau des COV communs, comme les alcènes légers, pourrait aider les chercheurs à interpréter plus efficacement leurs effets sur le climat et sensibiliser le grand public aux objectifs de neutralité climatique de l’UE.
Objectif
Volatile Organic Compounds (VOCs) play a critical role in the physical and chemical properties of the atmosphere and regulating Earth’s climate. Among them, light alkenes and alkyl halides (e.g. CH3X) are also critically important for tropospheric ozone formation and stratospheric ozone depletion, respectively. However, global budgets of light alkenes and CH3X are not in balance because many sources/sinks have not been quantified realistically due to paucity of measurements; especially, fluxes in Arctic ecosystems have not yet been well established. Furthermore, drivers of the fluxes and their response to the fast climate change are yet to be unraveled.
This proposed project aims to fill in the gaps of the state-of-the-art by (1) determining the sources/sinks of these VOCs in an Arctic tundra ecosystem; (2) quantifying how Arctic warming and increased atmospheric CO2 may impact the VOCs fluxes in the Arctic tundra ecosystems; (3) constructing the relationships between the VOC fluxes and environmental and biological factors to determine the drivers of variability and synchronicity of fluxes; and (4) constructing flux algorithms to be incorporated into the MEGAN model to enhance scientific understanding of VOC biogeochemistry and related environmental implications.
The project takes an interdisciplinary approach involving atmospheric biogeochemistry, environmental chemistry, Arctic ecology and ecosystem modeling, which combines my research skills and expertise of the host. The expected high-quality publications, training and interdisciplinary collaborations will be valuable assets to support my career development. The effective dissemination of the research outputs will increase the public’s consciousness on earth system as a whole and the action of climate change mitigation, and will bring important social benefits by promoting the public’s agreements on EU’s goal of climate-neutral by 2050 and the implementation of European Green Deal.
Champ scientifique
- natural scienceschemical sciencesorganic chemistryvolatile organic compounds
- natural sciencesearth and related environmental sciencesenvironmental sciencesozone depletion
- natural sciencesbiological sciencesecologyecosystems
- natural sciencesearth and related environmental sciencesatmospheric sciencesclimatologyclimatic changes
- natural sciencesearth and related environmental sciencesgeochemistrybiogeochemistry
Programme(s)
- HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA) Main Programme
Régime de financement
MSCA-PF - MSCA-PFCoordinateur
1165 Kobenhavn
Danemark