Littérature scientifique sur le sujet « Sahelian band »
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Articles de revues sur le sujet "Sahelian band"
Delon, C., C. Galy-Lacaux, A. Boone, C. Liousse, D. Serça, M. Adon, B. Diop et al. « Atmospheric nitrogen budget in Sahelian dry savannas ». Atmospheric Chemistry and Physics Discussions 9, no 3 (30 juin 2009) : 14189–233. http://dx.doi.org/10.5194/acpd-9-14189-2009.
Texte intégralFrison, P. L., G. Mercier, G. Faye, E. Mougin, P. Hiernaux, C. Lardeux et J. P. Rudant. « Analysis of L- and C-Band SAR Image Time Series Over a Sahelian Area ». IEEE Geoscience and Remote Sensing Letters 10, no 5 (septembre 2013) : 1016–20. http://dx.doi.org/10.1109/lgrs.2012.2227931.
Texte intégralSy, Abdoulaye, Christophe Duroure, Jean-Luc Baray, Yahya Gour, Joël Van Baelen et Bouya Diop. « Space-Time Variability of the Rainfall over Sahel : Observation of a Latitudinal Sharp Transition of the Statistical Properties ». Atmosphere 9, no 12 (7 décembre 2018) : 482. http://dx.doi.org/10.3390/atmos9120482.
Texte intégralMagagi, R. D., Y. H. Kerr et J. C. Meunier. « Results of combining L- and C-band passive microwave airborne data over the Sahelian area ». IEEE Transactions on Geoscience and Remote Sensing 38, no 4 (juillet 2000) : 1997–2008. http://dx.doi.org/10.1109/36.851781.
Texte intégralAlcoba, M., M. Gosset, M. Kacou, F. Cazenave et E. Fontaine. « Characterization of Hydrometeors in Sahelian Convective Systems with an X-Band Radar and Comparison with In Situ Measurements. Part II : A Simple Brightband Method to Infer the Density of Icy Hydrometeors ». Journal of Applied Meteorology and Climatology 55, no 2 (février 2016) : 251–63. http://dx.doi.org/10.1175/jamc-d-15-0014.1.
Texte intégralRowell, David P., Rory G. J. Fitzpatrick, Lawrence S. Jackson et Grace Redmond. « Understanding Intermodel Variability in Future Projections of a Sahelian Storm Proxy and Southern Saharan Warming ». Journal of Climate 34, no 2 (janvier 2021) : 509–25. http://dx.doi.org/10.1175/jcli-d-20-0382.1.
Texte intégralLouf, Valentin, Olivier Pujol et Henri Sauvageot. « The Seasonal and Diurnal Cycles of Refractivity and Anomalous Propagation in the Sahelian Area from Microwave Radiometric Profiling ». Journal of Atmospheric and Oceanic Technology 33, no 10 (octobre 2016) : 2095–112. http://dx.doi.org/10.1175/jtech-d-14-00208.1.
Texte intégralSamasse, Kaboro, Niall P. Hanan, Julius Y. Anchang et Yacouba Diallo. « A High-Resolution Cropland Map for the West African Sahel Based on High-Density Training Data, Google Earth Engine, and Locally Optimized Machine Learning ». Remote Sensing 12, no 9 (1 mai 2020) : 1436. http://dx.doi.org/10.3390/rs12091436.
Texte intégralCazenave, F., M. Gosset, M. Kacou, M. Alcoba, E. Fontaine, C. Duroure et B. Dolan. « Characterization of Hydrometeors in Sahelian Convective Systems with an X-Band Radar and Comparison with In Situ Measurements. Part I : Sensitivity of Polarimetric Radar Particle Identification Retrieval and Case Study Evaluation ». Journal of Applied Meteorology and Climatology 55, no 2 (février 2016) : 231–49. http://dx.doi.org/10.1175/jamc-d-15-0013.1.
Texte intégralThouret, V., M. Saunois, A. Minga, A. Mariscal, B. Sauvage, A. Solete, D. Agbangla et al. « Two years of Ozone radio soundings over Cotonou as part of AMMA : overview ». Atmospheric Chemistry and Physics Discussions 9, no 3 (5 mai 2009) : 11221–68. http://dx.doi.org/10.5194/acpd-9-11221-2009.
Texte intégralThèses sur le sujet "Sahelian band"
Audoux, Thomas. « Approches expérimentales pour l’étude et la caractérisation des dépôts humides d’aérosols atmosphériques par les précipitations ». Electronic Thesis or Diss., Université Paris Cité, 2022. http://www.theses.fr/2022UNIP7332.
Texte intégralIn the work conducted for my thesis, I studied atmospheric aerosols and their transfer from the atmosphere to the surface by precipitation. The main strategy I followed is based on the observation of wet deposition on different time scales, interannual on one hand and intra-event on the other. It also relies on their observation in environments marked in terms of aerosol load and composition, but also in terms of atmospheric dynamics and precipitation. Combining measurements on both atmospheric and wet deposition compositions allows to identify the characteristics of the deposition (intensity, composition, source and origin) and to explain the phenomena involved in the deposition. This requires the complete documentation of different parameters (aerosols, dynamics, rainfall, deposition) over the same periods of time, which is nevertheless complex to implement. The two axes of my work deal with distinct and complementary issues in the study of wet deposition.The first focus has been on wet deposition in the Sahel, a semi-arid region where the scavenging of mineral dust from the atmosphere is a key process to constrain the atmospheric mass balance of these compounds. In this region marked by the presence of numerous convective systems controlling annual precipitation amounts, the question of the links between atmospheric dynamics and deposition was addressed. The long-term observation strategy implemented at stations in the Sahel as part of the INDAAF network, with a synergy of meteorological measurements, aerosol concentrations and deposition, has enabled the creation of a very complete database. From this multi-year dataset at Banizoumbou (Niger) and Cinzana (Mali) stations from 2007 and 2015, the identification of cold pools phenomena from surface meteorological data and their link with mineral dust deposition are discussed. Washout ratios have been calculated for cold pool events and vary over several orders of magnitude depending on the dilution effect which differs according to the levels of atmospheric aerosol concentrations. The most convective events associated with high concentrations have a less scattered range of values (319 – 766) that does not depend on the amount of precipitation.The second axis focused on the intra-event study of wet deposition in urban areas for various rainfall situations, aerosol concentration and composition. The question is: what can we learn from the monitoring of deposition during a rain event? To answer this, I first participated in the development of a collector allowing me to collect wet deposition in successive fractions during the rain event. Complemented by a set of co-located measurements on aerosols and atmospheric dynamics acquired in the field for 8 study cases, the chemical analyses of dissolved and particulate deposition allowed me to discuss both the origin of the aerosols and processes involved. I was able to quantify the decay of concentrations, even of trace compounds, in the deposits during rainfall. I was also able to document the evolution of solubility for chemical species in the deposition and discuss the relative contribution of the rainout and washout mechanisms. The variability of deposition observed during an event is actually as significant as that observed between rain events