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[ Article ] Dynamics of water vapor and energy exchanges above two contrasting Sudanian climate ecosystems in Northern Benin (West Africa): Water Vapor and Energy Exchanges

Date de soumission: 06-02-2017
Année de Publication: 2016
Entité/Laboratoire Laboratoire de Physique du Rayonnement (LPR)
Document type : Article
Discipline(s) : Physique
Titre Dynamics of water vapor and energy exchanges above two contrasting Sudanian climate ecosystems in Northern Benin (West Africa): Water Vapor and Energy Exchanges
Auteurs MAMADOU Ossénatou [1], GALLE Sylvie [2], COHARD Jean-Martial [3], PEUGEOT Christophe [4], KOUNOUHEWA BASILE BRUNO [5], BIRON Romain [6], HECTOR Basile [7], ZANNOU Arnaud Bruno [8],
Journal: Journal of Geophysical Research : Atmospheres
Catégorie Journal: Internationale
Impact factor: 3.94
Volume Journal: 121
DOI: 10.1002/2016JD024749
Resume Natural ecosystems in sub-Saharan Africa are experiencing intense changes that will probably modify land surface feedbacks and consequently the regional climate. In this study, we have analyzed water vapor (QLE) and sensible heat (QH) fluxes over a woodland (Bellefoungou, BE) and a cultivated area (Nalohou, NA) in the Sudanian climate of Northern Benin, using 2 years (from July 2008 to June 2010) of eddy covariance measurements. The evaporative fraction (EF) response to environmental and surface variables was investigated at seasonal scale. Soil moisture was found to be the main environmental factor controlling energy partitioning. During the wet seasons, EF was rather stable with an average of 0.75 ± 0.07 over the woodland and 0.70 ± 0.025 over the cultivated area. This means that 70–75% of the available energy was changed into actual evapotranspiration during the investigated wet seasons depending on the vegetation type. The cumulative annual actual evapotranspiration (AET) varied between 730 ± 50 mm yr−1 at the NA site and 1040 ± 70 mm yr−1 at the BE site. With similar weather conditions at the two sites, the BE site showed 30% higher AET values than the NA site. The sensible heat flux QH at the cultivated site was always higher than that of the woodland site, but observed differences were much less than those of QLE. In a land surface conversion context, these differences are expected to impact both atmospheric dynamics and the hydrological cycle
Mots clés water vapor, energy exchanges, eddy covariance, actual evapotranspiration
Pages 269 - 286
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