Search results for "atla"

Recent changes in measured wind in the NE Atlantic and variability of correlation with NAO

2010

The paper deals with wind measurements, recorded since the 1950s, at twelve meteorological stations along a transect near the westernmost European border, between 64° and 44° N. Extreme wind speed tends to decrease sharply near the northern boundary (at Reykjavick), near the middle of the study area (at Shannon and Valentia) and near the southern boundary (at Brest and Cap Ferret), to increase at Thorshavn, with less significant trends at the other stations. Average wind speeds confirm the above tendencies, with an additional increasing speed at Lerwick, Kirkwall, Malin Head, Belle-Ile and Cap Ferret. To compare changes in wind activity, the data have been subdivided into three periods: unt…

Nouvelles données sur la localité type et la morphométrie dentaire du campagnol de Gerbe Microtus pyrenaicus gerbei (Gerbe, 1879) (Cricetidae, Rodent…

2015

New data on type locality and dental morphometry of the Gerbe’s vole Microtus pyrenaicus gerbei (Gerbe, 1879) (Cricetidae, Rodentia). The synthesis of the historical research done on Arthur de L’Isle du Dréneuf’s life, the discoverer of the Gerbe’s vole Microtus pyrenaicus gerbei (Gerbe, 1879), and the circumstances connected with this discovery, allow to say that its type locality is the municipality of La Haie-Fouassière (Loire-Atlantique, France). The analysis of teeth found in pellets of barn owl from Pornic (Loire-Atlantique, France) has confirmed the odontometrical differentiation previously observed in M. pyrenaicus gerbei.

Statistical atlas based exudate segmentation

2013

International audience; Diabetic macular edema (DME) is characterized by hard exudates. In this article, we propose a novel statistical atlas based method for segmentation of such exudates. Any test fundus image is first warped on the atlas co-ordinate and then a distance map is obtained with the mean atlas image. This leaves behind the candidate lesions. Post-processing schemes are introduced for final segmentation of the exudate. Experiments with the publicly available HEI-MED data-set shows good performance of the method. A lesion localization fraction of 82.5% at 35% of non-lesion localization fraction on the FROC curve is obtained. The method is also compared to few most recent referen…

Variations in intensity of the westerly monsoon-like flow from the tropical Atlantic and summer rainfall over equatorial and tropical southern Africa

2009

International audience; An empirical orthogonal function (EOF) of the onshore flow of moisture along the west coast of southern Africa using NCEP-DOE AMIP-2 re-analyses suggests two dominant modes of variability that are linked to: (a) variations within the circulation linked to the mid-latitude westerlies and the South Atlantic anticyclone, (b) the intensity of the westerly flow from the tropical Atlantic. The second mode, referred to as the Equatorial Westerly mode, contributes the most to moisture input from the Atlantic onto the subconti-nent at tropical latitudes. This mode appears to be associated with large-scale rainfall anomalies over the upper lands surrounding the Congo basin in …

Global sea-to-air flux climatology for bromoform, dibromomethane and methyl iodide

2013

Volatile halogenated organic compounds containing bromine and iodine, which are naturally produced in the ocean, are involved in ozone depletion in both the troposphere and stratosphere. Three prominent compounds transporting large amounts of marine halogens into the atmosphere are bromoform (CHBr3), dibromomethane (CH2Br2) and methyl iodide (CH3I). The input of marine halogens to the stratosphere has been estimated from observations and modelling studies using low-resolution oceanic emission scenarios derived from top-down approaches. In order to improve emission inventory estimates, we calculate data-based high resolution global sea-to-air flux estimates of these compounds from surface ob…

Early Jurassic normal faulting in a carbonate extensional basin: characterization of tectonically driven platform drowning (High Atlas rift, Morocco).

2009

18 pages; International audience; This paper describes a tectonostratigraphic model of the synrift evolution of the Early Jurassic High Atlas rift of Morocco. The model is constrained by mapping of a set of inverted extensional blocks, by facies analysis of carbonate platform and turbiditic to hemipelagic synrift deposits, and by high-resolution (n 3 100 ka) biostratigraphy of the Early Jurassic succession. The chronostratigraphic packages of the High Atlas of Rich vary significantly in thickness, facies and architecture from one tectonic block to another. Our study shows how synrift strain varied in space and time over a long time interval (14 Ma) around the High Atlas rift. Initially, in …

Sédimentologie et quantification de la subsidence des séries liasiques dans le Haut Atlas Central marocain (coupe de Foum Zabel, région de Rich).

2007

13 pages; International audience

Automatiser la production de fiches : exemple de création d'un atlas botanique

2013

Atlas historique et technique de la pierre à bâtir bourguignonne. Plateforme numérique mutualiste sur la nature et l’usage de la pierre

2011

L'objectif de cet atlas est de déterminer les arguments environnementaux qui ont défini la Bourgogne comme une région novatrice et influente dans le domaine de l'histoire de l'art et de l'architecture. La Bourgogne possède une identité fortement marquée par les arts de la construction et de la statuaire. Les ressources géologiques exploitables sont nombreuses et variées. Ces aspects font l'objet d'attentions particulières et complémentaires, tant de la part des chercheurs (archéologues, historiens, géologues) que de celles des professionnels de la filière " pierre " et de la gestion du patrimoine. La prise en compte de cet intérêt commun est l'un des points forts du projet...

Du Finistère au Golfe de Gascogne : le Bronze moyen et le début du Bronze final dans l’ouest de la France (Bretagne, Pays de la Loire, Centre, Poitou…

2017

Actes du colloque internationale de l'APRAB “Bronze 2014”, Strasbourg, 17-20 juin 2014; International audience; Des massifs granitiques armoricains à la chaîne des Pyrénées, l’espace géographique, géologique et topographique retenu ici est extrêmement diversifié, irrigué par un important réseau hydrographique et une grande façade maritime.Largement ouvert vers l'est par les vallées de la Loire, la Dordogne, la Garonne et leurs affluents, l'espace est également tourné vers la Manche et la péninsule Ibérique.Les ressources minérales exploitables sont rares en région Centre ou en Poitou-Charentes mais d'importantes ressources stannifères et aurifères sont connues en Bretagne, dans les Pays de …