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Dakar 2005: Conference Themes
Surface - Atmosphere Feedbacks
Surface-Atmosphere feedbacks: Recent studies with climate models have confirmed that the WAM is a hot-spot of surface-atmosphere interactions but the processes causing this strong interac-tion have not yet been identified. Presentations in this section will re-view our current knowledge and present new ideas on the mechanisms which could explain the strong surface-atmosphere feedbacks. The discussions should foster coordinated studies to explore and better understand the coupling at a regional and mesoscale.
Coordinators: C. Taylor,
J. Polcher
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Third
Plenary: Surface-Atmosphere Feedbacks
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Author
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Title
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| Douville, Hervé, and Sébastien Conil | Soil moisture influence on the West African Monsoon variability and predictability at the seasonal timescale |
| Eltahir, Elfatih A. B., and Guiling Wang | The Role of the Ocean, and the Biosphere in shaping the Monsoon over of West Africa |
| Haarsma, Reindert, Wilco Hazeleger, Wim-Paul Bruegem, Roberto de Almeida | Tropical Atlantic variability in the coupled SPEEDO model |
| Intsiful, J., Bagamsah T. T, Denich M., Fosu M., Vlek P. L. G., Pal, J., Solmon, F. and Allotey, F | Modeling the impacts of bushfire-induced land use change on surface energy fluxes, moisture indicators and atmospheric chemistry in the Volta Basin |
| Lawrence, David | The soil moisture – precipitation feedback and its interaction with African easterly waves |
| Mougin E., Hiernaux P., Kergoat L., Seghieri J., Lavenu F., Tracol Y., Jarlan L., Diarra L., Dembélé F., Karembé M., Mougenot B., Timouk F., de Rosnay P., LeDantec V., Baup F., Mangiarotti S. | Réponse de la végétation sahélienne en Afrique de l’Ouest à la variabilité climatique. Conséquences sur les interactions surface-atmosphère |
| SOW, Bamol Ali | Modélisation de l'upwelling sénégalais |
| Taylor, Christopher M. | Soil moisture – rainfall feedbacks in the Sahel |
| Trzaska, Sylwia, Andrew W. Robertson, John D. Farrara, Carlos R. Mechoso | Coupled ocean-atmosphere variability in the South Atlantic |
| Vanvyve, Emilie, and Nathalie Philippon | Vegetation- and soil wetness-atmosphere interactions modelled by a Regional Climate Model during the year 1987 |
| Xue, Yongkang, Hyun-Suk Kang, David Niyogi, G. James Collatz, Charles Taylor, Seydou Doumbia, Molly E. Brown | Land/climate interaction in West Africa |
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Third
Poster Session: Water Cycle and
Surface-Atmosphere Feedbacks
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Water
Cycle
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| Akoshile, C. O., A. A. Willoughby, I. A. Adimula, T. B. Ajibola, O. A. Falaiye, E. B. Babatunde, T. O.Aro | Seasonal Variation of Relative Humidity at Ilorin, Nigeria |
| Berges, J.C., and F. Chopin | Computation of convective kernels growing rate |
| Bouchard, A., C. Revillet, Y. Lemaître, A. Protat, N. Viltard | Large-scale moisture budget of the African Monsoon based on spaceborne and ground-based observations |
| Bousquet, Sandine, Jacques Gignoux, Alain Perrier | Role des arbres à enracinement profond dans les écosystèmes semi-arides sahéliens |
| DIALLO, Drissa | Ruissellement en milieu cuirassé et gestion des eaux et des sols en zone soudanienne d’Afrique occidentale |
| DIATTA, Samo, Nicolas VILTARD, Amadou Thierno GAYE | Vertical profiles of space-based rain estimates in West Africa using TRMM precipitation radar data |
| Dudek, J., H. Laurent, C. Depraetere, M. Gosset | Precipitation in North Benin: comparison between ground-based rain event classification and cloud systems tracked from satellite data |
| Fierli, F. | Water vapor meridional transport in the Sahelian region |
| Galle S., Thévenot N., Laurent, J-P., Séguis L., Peugeot C., Afouda S., Ouani T. | Bilan hydrique stationnel sur le bassin versant de la Donga (Bénin). Premiers resltats sur les Stations de Jachere et de Foret Claire |
| Giraud, V., F. Bouo-Bella, and S. Cautenet | Study of convective activity associated with stratocumulus covers during wet season over West Africa |
| Gosset, Marielle, Frederic Cazenave, Olivier Lebrouster, Josias Dossugouin, Etienne HOUNGNINOU | Xport in Djougou: First measurements of African precipitations with an Xband polarimetric radar |
| Grandpeix, Jean-Yves | Water budget of the monsoon layer in LMDZ simulations: role of convective entrainment and of surface evaporation |
| Grimes, D.I.F. | Validation of the TAMSAT algorithm for satellite-derived rainfall estimates in west Africa |
| Kallel, Abdelaziz, Mehrez Zribi, Sylvie Le Hégarat-Mascle, Sylvain Massuel, Luc Descroix | Characterization of pool evolution in Niamey degree (Niger) based on high resolution optical remote sensing data |
| Kamagaté, B., L. Séguis, G. Favreau and J. L. Seidel | Origins of the flows in a tropical bedrock basin in Benin (Donga, upstream of Oueme river) |
| KEBE Cheikh Mouhamed Fadel (1), H. Sauvageot (2) et A. Nzeukou | Relation entre les intégrales spatio-temporelles de la couverture nuageuse et la pluie au sol à la transition entre un climat aride et un climat équatorial- Implications pour la mesure des précipitations depuis l’espace |
| KOUNOUHEWA, Basile | Proposition d’un estimateur de l’hygrométrie dans la troposphère et la stratosphère au-dessus de Cotonou |
| Laurent, Jean-Paul, Luc Descroix, Stéphane Boubkraoui, Hamissou Alassane | Stratégies de suivi des transferts d’eau dans les sols mises en œuvre sur le site de méso-échelle de Niamey |
| Le Lay, M., I. Zin, S. Galle, G.M. Saulnier, C. Peugeot, L. Séguis, I. Braud | Hydrological behaviour of the Donga catchment: testing some modelling asumptions |
| Nzeukou A., Fioko L., Sauvageot H. and Gaye A. | Modélisation par la méthode du « Scaling law » des distributions de gouttes de pluie sur la région côtière de Debuncha au Cameroun |
| Onibon, Hubert, Alfonso Gutiérrez-López | Comparative hydrological drought-flood risk modeling at West African Sahel Region and Northern Mexico |
| Peugeot C., Depraetere C., Le Barbé L., Séguis L., Galle S., Afouda S., Arjounin M., Boubkraoui S., Bouchez J-M., Jacquin F., Malinur F., Ouani T., Thévenot N., Zannou A. | Meso-scale analysis of the hydrological functionning of the Upper Oueme Basin (Benin) |
| Robain, Henri, Maxime Wubda, Sylvie Galle, Luc Séguis et Christophe Peugeot | Etude du Site de Djougou (Bénin) par tomographie de résistivité électrique: importance de la variabilité spatiale des couvertures d’altération pour la connaissance du fonctionnement hydrique souterrain |
| Sané, Tidiane, et Mbaye Diop | La variabilité pluviométrique et la dégradation de la saison pluvieuse au Sénégal |
| Schrage, Jon M., Stephen Augustyn, and Andreas H. Fink | Nocturnal Low-level Stratiform Clouds during the West African Summer Monsoon |
| Séguis L., Galle S., Peugeot C., Robain H., Afouda S., Arjounin M., Boubkraoui S., Bouchez J-M., Jacquin F., Malinur F., Ouani T., Thévenot N., Wubda M. | Water redistribution over two catena of the Donga watershed (Benin) during the rainy season. Impact on the discharge outset |
| TOSSA, Aurélien A. Y. | Etude synoptique des réseaux hydro-climatiques d’observations systématiques du Bénin |
| Viltard, N, F. Chopin, A. Lô | Rain retrieval over Continental Africa from Spaceborne Passive Microwave Instruments |
| Vischel Théo, Lebel Thierry , Messager Christophe, Amani Abou | Scale issues in assessing the water balance of a regional-size Sahelian catchment |
| VISSIN, Expédit Wilfrid, Pierre CAMBERLIN | Impact de la péjoration pluviométrique sur les ressources en eau du bassin de la Sota (Bénin Afrique de l’ouest) |
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Surface-Atmosphere
Feedbacks
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| André, Cyrille, Mehrez Zribi,Catherine Ottlé | Land cover cartography over the Niger AMMA site from the eighties to nowadays using SPOT time series images |
| Ayina, Ludos-Hervé, A. Bentamy and A. M. Mestas-Nuñez | The Impact of Satellite Winds and Latent Heat Fluxes in a Numerical Simulation of the Tropical Ocean during 1996-1998 |
| Bailleul, Charlotte, Luc Descroix, Thierry Lebel, Arona Diedhiou, Bernard Cappelaere, Bruno Gérard, Seydou Traoré, Jean Paul Laurent, Julien Morel, Jacques Gignoux, Nicolas Boulain, Manon Rabanit, Sandie Bousquet, Stéphane Boubkraoui, Hamissou Alassane, Abdoulaye Koné | Feed back surface/atmosphère : et l’échelle locale? |
| Bentamy, A., L-H. Ayina, K. B. Katsaros, R. T. Pinker, A. M. Mestas-Nuñez | Improved Estimates of Net Air-Sea Fluxes over the Tropical Atlantic Ocean |
| Berges, J.C., and C. Mering | Connected filters applied to data fusion |
| Boone, A., P. de Rosnay and J.-P. Lafore | Multiscale land surface model database and intercomparison within AMMA |
| Boulain, N., M.Rabanit, L.Descroix, B.Cappelaere | Vegetation, Hydrology and Atmosphere interactions; measuring vegetation parameters and fluxes in a Sahelian catchment over the 2005 season |
| Bourras, Denis, and Guy Caniaux | Turbulent Air-Sea Fluxes from Satellites and Models in the Equatorial Atlantic |
| Cerlini, Paolina Bongioannini | Convective variability using a three-dimensional cloud-ensemble model in radiative-convective equilibrium |
| Chiapello, Isabelle, Cyril Moulin, and Joseph M. Prospero | Understanding the long-term variability of African dust as recorded in surface concentrations and large-scale satellite observations |
| Delon Claire, Serça Dominique, Dupont Richard, De Rosnay Patricia, Timouk Franck, Mougin Eric | NO emission from soil in tropical conditions |
| d’Orgeval, T., J. Polcher, P. de Rosnay, T. Ngo-Duc | Impact of the Sahel drought on the water balance in LSMs |
| DAGORNE, Dominique, Nicolas KOLODZIEJCZYK, Bernard BOURLES | SEA SURFACE TEMPERATURE VALIDATION IN THE GUINEA GOLF |
| Damesin, Claire, Jon Bennie, Lina Mercado, Josiane Seghieri | Fonctionnement de quelques espèces du couvert végétal du site de mesures intensives d’Agoufou, Gourma, Mali |
| de Rosnay, Patricia, Frederic Baup, Frank Timouk, Cindy Couderc, Valérie Le Dantec, Laurent Kergoat, François Lavenu, Eric Mougin | Soil moisture monitoring in the Gourma meso scale site: from local station network to remote sensing approaches |
| Fensholt, Rasmus, Inge Sandholt, Simon Stisen and Anette Nørgaard | Improved land surface modelling using Earth Observation data from the geostationary Meteosat Second Generation (MSG) |
| Flamant, C., and O. Bock | Analysis of surface-atmosphere-ocean interactions during six West African Monsoon seasonal cycles between 2000 and 2005 using satellite observations and ECMWF analyses |
| GARBA, Zibo, Amadou SOUMAILA & Barma MALAM KIARI | Identification et quantification des aérosols incorporés dans des sols ferrugineux tropicaux développés sur le Continental terminal des environs de Boubon ((13°37’ N et 1°56’E, Zone sahélienne du Niger) : impact sur la fertilité et l’érosion de sols en jachères |
| Giordani, H., G. Caniaux, F.Marin, Y. DuPenhoat, B. Bourlès, P. Marchesiello, D. Bourras and A.M. Tréguier | Ocean-Atmosphere Modelling Strategy during EGEE-AMMA |
| Grini, Alf, Pierre Tulet, Laurent Gomes | Dust effect on convective events in the West African Monsoon region |
| Heidt, S., N. Kalthoff, G. Schädler, M. Kohler and Ch. Kottmeier | Modelling of Convective Systems in the Burkina Faso/Ghana Area with the Regional Model LM |
| Intsiful, J., H. Kunstmann, P. Vlek, B. Diekrüger, F. Allotey | An inverse-SVAT modeling technique for upscaling land surface parameters |
| Jarlan L., Tourre Y., Mougin E., Philippon N., Mazzega P., Mangiarotti S. | Principaux motifs de variabilité de l’indice de végétation NDVI et des produits LAI issus des longues séries temporelles acquises par les capteurs AVHRR sur le Sahel (1982-2003) |
| Lamb, Peter J., and M. Issa Lele | Background Climatology for the ARM Mobile Facility Deployment in Niamey: Mean Annual Cycle and 2004-2005 Interannual Variability |
| Le Dantec, Valérie, Claire Damesin, Daniel Epron, Josiane Seghieri, Jon Bennie, Lina Mercado, Claire Delon, Richard Dupont, Dominique Serça, Colin Lloyd, Laurent Kergoat, Eric Mougin | Présentation des mesures d'échanges gazeux de la feuille au couvert dans un écosystème sahélien (Mali) |
| Leclercq, Isabelle Poccard and Yongkang Xue | EVALUATION OF THE WEST AFRICAN WATER AND ENERGY BALANCES BASED ON THE SSIB VEGETATION MODEL (1982-1990) |
| Lloyd, Colin R., Phil P. Harris, Nicolas Boulain, Jean-Martial Cohard, Andreas Fink , Sylvie Galle, Dominique Serça and Franck Timouk | The AMMA Surface Flux network: Measurements, preliminary data and modelling |
| Lothon, M., F. Couvreux, S. Donier, F. Guichard, P. Lacarr`ere, F. Sa¨ıd | Organized structures in the Sahelian boundary layer during the transition period between the wet and dry seasons |
| Mafany, G.T., Ernst, G.G.J., Sparks,R.S.J., Suh, C.E., Fantong, W.Y., Ayonghe, S.N. | Lightning associated with the 1999 eruption of Mount Cameroon Volcano |
| Mangiarotti S., Jarlan L., Mougin E., Mazzega P., et Hiernaux P | Assimilation des données NDVI-VGT/SPOT dans un modèle de surface simple visant au suivi de la végétation et de la dynamique des flux d’eau sur la région du Gourma (Mali) |
| Mangiarotti S., Mazzega P., Mougin E., Jarlan L. et Hiernaux P | Prédictibilité du cycle de la végétation en Afrique de l’ouest à partir des données NDVI : analyse des invariants en fonction des échelles spatiales |
| Menut L., G.Foret and G.Bergametti | Impact of mineral dust size resolved bin schemes on simulated mineral dust concentrations accuracy over the western Africa |
| Nørgaard, Anette, Simon Stisen, Inge Sandholt and Rasmus Fensholt | Regionalisation of SVAT modeling in the Senegal River basin using remotely sensed data and insitu measurements |
| Odunuga, Shakirudeen, Lekan Oyebande | Implication of Urban Landuse on Hydrological Fluxes in an Urban System |
| Peter, Anne-Charlotte, Matthieu Le Henaff, Yves du Penhoat, Christophe E. Menkes, Frederic Marin, Jerome Vialard, Guy Caniaux, Alban Lazar | A model study of the seasonal mixed layer heat budget in the equatorial Atlantic |
| Picart, Stéphane Saux, Mehrez Zribi,Catherine Ottlé, Alain Perrier | Land surface temperature diurnal cycles analysis over Niger in relation with surface and atmospheric characteristics |
| ROUAULT, Mathieu | Near real time remote sensing in the Tropical Atlantic |
| Stisen, Simon, Anette Nørgaard, Rasmus Fensholt and Inge Sandholt | Spatially distributed hydrological modeling of the Senegal River basin using satellite data |
| Zribi, Mehrez, Stéphane Saux-Picart, Catherine Ottlé, Luc Descroix | Mapping surface soil moisture over Kori Diantandou site (Niger) with ASAR/ENVISAT radar data |
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