Summer School "Ecology and Society: Frontiers and Boundaries" / 3 - 7 June 2019

Ecosystems societies Climate change Forests Hydrosystems Atmosphere Biodiversity Agrosystems Pressures Impacts Modelling Pollution Ecotoxicology Biogeochimical cycles Ecology Adaptability

Hydrosystems week

Forest trip


Visiting Bordeaux


Field trip - Salles

Field trip - Salles

Hydrosystems week

City trip - Crédits photo LabEx COTE

Visiting Bordeaux

Thematic weeks organisation committee

Wine tasting - Crédits photo LabEx COTE

Class room - Crédits photo LabEx COTE

Hôtel Chateau Latour - Crédits photo LabEx COTE

Welcome !

Dégustation - Crédits photo LabEx COTE


Vallée du Ciron - Crédits photo LabEx COTE

Group 2018 - Crédits photo LabEx COTE

Field trip 2015 - Forest Crédits photo LabEx COTE

Role of cloud microorganisms in atmospheric processes - Anne-Marie DELORT

10 years ago our team started to study microorganisms present in cloud waters at the puy de Dôme station. We showed that they were alive and metabolically active because they can resist to atmospheric stresses. This pioneering work opened new scientific questions concerning their potential role in atmospheric chemistry and physics. We showed that microorganisms can act as an alternative route to radical chemistry to transform organic compounds and oxidant species in clouds. Also some bacteria can act as Ice Nuclei thanks to their membrane protein and could thus participate to precipitations.

Key words: cloud, Microorganisms, atmospheric chemistry and physics

Recent papers related to the talk:

DELORT A.-M., VAITILINGOM M., AMATO P., SANCELME M., PARAZOLS M., MAILHOT G., LAJ P., DEGUILLAUME L (2010): A short overview of the microbial population in clouds: Potential roles in atmospheric chemistry and nucleation processes. Atmospheric Research 98: 249-260.

VAITILINGOM M. , ATTARD E, GAIANI N., SANCELME M, DEGUILLAUME L., FLOSSMANN A., AMATO P, DELORT A.-M. (2012) : Long-term features of cloud microbiology at the puy de Dôme (France)Atmospheric Environment 56: 88-100.

ATTARD E, YANG H., DELORT A.-M., AMATO P., POSCHL U., GLAUX C., KOOP T, MORRIS CE (2012):Effects of atmospheric conditions on ice nucleation activity of Pseudomonas .Atmospheric Chemistry and Physics 12: 10667-10677.

JOLY M. , ATTARD E., SANCELME M., DEGUILLAUME L., GUILBAUD C., MORRIS C. E., AMATO P., DELORT A.-M.  (2013): Ice nucleation activity of bacteria isolated from cloud water. Atmospheric Environment 70: 392-400.

VAITILINGOM M. , DEGUILLAUME L., VINATIER V, SANCELME M ,AMATO P, CHAUMERLIAC N, DELORT A.-M. (2013) : Potential impact of microbial activity on the oxidant capacity and organic carbon budget in clouds. Proceeding of National Academy of Science (USA) 110 (2):559-564.