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Greenhouse gases
Greenhouse gases have a longer timelife in the atmosphere than reactive gases. The contribute to the global warming of the atmosphere by absorbing infrared radiation emitted by the earth's surface. Carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) are among the main greenhouse gases.
These gases are sampled on a weekly basis and analyzed a posteriori by the University of Bern and by the LSCE laboratory. These samples have been supplemented since 2011 by continuous measurements by spectroscopy (Picarro instrument), as part of the ICOS research infrastructure.
Water vapor is also a greenhouse gas which has specific characteristics: naturally present in the atmosphere, it is an element of the atmospheric water cycle and participates in the formation of clouds and precipitation. It is therefore measured by an instrumental synergy: in situ by humidity sensor and by the Picarro du puy de Dôme, in vertical profiles of water vapor measured by lidar on the Cézeaux site and in vertical columns vertically integrated with the GPS stations located on the various CO-PDD sites.
Contact : Aurélie Colomb
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