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<publisher>HAL CCSD</publisher>
<title lang=en>Gas transfer velocities of CO2 and CH4 in a tropical reservoir and its river downstream</title>
<creator>Guérin, F.</creator>
<creator>Abril, G.</creator>
<creator>Serça, D.</creator>
<creator>Delon, C.</creator>
<creator>Richard, S.</creator>
<creator>Delmas, Robert</creator>
<creator>Tremblay, A.</creator>
<creator>Varfalvy, L.</creator>
<contributor>Laboratoire d'aérologie - LA (LA) ; Université Paul Sabatier - Toulouse 3 (UPS) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire Midi-Pyrénées (OMP) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Environnements et Paléoenvironnements OCéaniques (EPOC) ; Observatoire aquitain des sciences de l'univers (OASU) ; Université Sciences et Technologies - Bordeaux 1 - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - Université Sciences et Technologies - Bordeaux 1 - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - École pratique des hautes études (EPHE) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire Hydreco ; Université des Antilles et de la Guyane (UAG)</contributor>
<contributor>Équipe Troposphère ; Laboratoire d'aérologie - LA (LA) ; Université Paul Sabatier - Toulouse 3 (UPS) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire Midi-Pyrénées (OMP) - Centre National de la Recherche Scientifique (CNRS) - Université Paul Sabatier - Toulouse 3 (UPS) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire Midi-Pyrénées (OMP) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institut de Recherche d'Hydro-Québec [Varennes] (IREQ)</contributor>
<description>International audience</description>
<source>ISSN: 0924-7963</source>
<source>Journal of Marine Systems</source>
<publisher>Elsevier</publisher>
<identifier>hal-00519502</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00519502</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00519502</source>
<source>Journal of Marine Systems, Elsevier, 2007, 66 (1-4), pp.161-172. 〈10.1016/j.jmarsys.2006.03.019〉</source>
<identifier>DOI : 10.1016/j.jmarsys.2006.03.019</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmarsys.2006.03.019</relation>
<language>en</language>
<subject lang=en>Tropical environment</subject>
<subject lang=en>Lake</subject>
<subject lang=en>River</subject>
<subject lang=en>Gas exchange</subject>
<subject lang=en>Wind speed</subject>
<subject lang=en>Rainfall</subject>
<subject>[PHYS.PHYS.PHYS-AO-PH] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>We have measured simultaneously the methane (CH4) and carbon dioxide (CO2) surface concentrations and water–air fluxes by floating chambers (FC) in the Petit-Saut Reservoir (French Guiana) and its tidal river (Sinnamary River) downstream of the dam, during the two field experiments in wet (May 2003) and dry season (December 2003). The eddy covariance (EC) technique was also used for CO2 fluxes on the lake. The comparison of fluxes obtained by FC and EC showed little discrepancies mainly due to differences in measurements durations which resulted in different average wind speeds. When comparing the gas transfer velocity (k600) for a given wind speed, both methods gave similar results. On the lake and excluding rainy events, we obtained an exponential relationship between k600 and U10, with a significant intercept at 1.7 cm h− 1, probably due to thermal effects. Gas transfer velocity was also positively related to rainfall rates reaching 26.5 cm h−1 for a rainfall rate of 36 mm h− 1. During a 24-h experiment in dry season, rainfall accounted for as much as 25% of the k600. In the river downstream of the dam, k600 values were 3 to 4 times higher than on the lake, and followed a linear relationship with U10.</description>
<date>2007</date>
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