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Laboratoire d'aérologie |  |
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Laboratoire d'aérologie | |
| HAL: hal-00324596, version 1 |
| DOI: 10.1029/2006GL027929 |
| Detailed view |  Export this paper |
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| Geophysical Research Letters 33 (2006) 21407 |
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| Methane and carbon dioxide emissions from tropical reservoirs: Significance of downstream rivers |
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| Frédéric Guérin 1Gwenaël Abril 1 |
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| (2006-11) |
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| Methane (CH4) and carbon dioxide (CO2) concentrations and water-air fluxes were measured in three tropical reservoirs and their respective rivers downstream of the dams. From reservoirs, CH4 and CO2 flux were in the range of 3 +/- 2 and 254 +/- 392 mmol.m-2.d-1, respectively. Rivers downstream of dams were significantly enriched in CH4 and CO2 originating from reservoir hypolimnions. From rivers, CH4 and CO2 flux were in the range of 60 +/- 38 and 859 +/- 400 mmol.m-2.d-1, respectively. Despite their relatively small surfaces, rivers downstream of dams accounted for a significant fraction (9-33% for CH4 and 7-25% for CO2) of the emissions across the reservoir surfaces classically taken into account for reservoirs. A significant fraction of CH4 appeared to degas at the vicinity of the dam (turbines and spillways), although it could not be quantified. |
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| 1: | Environnements et Paléoenvironnements OCéaniques (EPOC) |
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CNRS : UMR5805 – INSU – Université Sciences et Technologies - Bordeaux I – Ecole Pratique des Hautes Etudes – Observatoire Aquitain des Sciences de l'Univers |
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| 2: | Laboratoire des Mécanismes et Transfert en Géologie (LMTG) |
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CNRS : UMR5563 – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III – Institut de recherche pour le développement [IRD] : UMR154 |
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| 3: | Laboratoire d'aérologie (LA) |
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CNRS : UMR5560 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
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| Subject | : | Sciences of the Universe/Earth Sciences |
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| Biogeosciences: Trace gases – Biogeosciences: Carbon cycling (4806) – Hydrology: Dams – Hydrology: Limnology (0458 – 4239 – 4942) – Global Change: Land cover change |
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| hal-00324596, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00324596 | |
| oai:hal.archives-ouvertes.fr:hal-00324596 | |
| From: Andy Senegas | |
| Submitted on: Thursday, 25 September 2008 14:56:33 | |
| Updated on: Thursday, 25 September 2008 14:56:33 | |
