Search results for "changes"
showing 10 items of 901 documents
Continental weathering and climatic changes inferred from clay mineralogy and paired carbon isotopes across the early to middle Toarcian in the Paris…
2014
Abstract Lower Toarcian strata (Lower Jurassic) have been extensively studied with a view to understanding the oceanographic, climatic and biological processes that drove the Earth's system into an Oceanic Anoxic Event (OAE). For this time period, the evolution of the European marine seaways is now relatively well constrained owing to multiple geochemical studies, but investigations regarding climatic trends in the continental realm remain sparse. In the present study, we test the clay mineralogy as a continental climate-sensitive proxy in the well-documented Sancerre core (southern Paris Basin). We compare variations in the kaolinite content with p CO 2 fluctuations (derived from paired ca…
Human settlement dynamics and alluvial dynamics of the Rhine River during the Holocene: Geoarchaeology of the site of Oedenburg (Haut-Rhin, France).
2007
The relationship between alluvial dynamics and control parameters such as climate are well known and understood at plurimillennial and pluriannual time-scales. But it is not really the case at multicentennial and multidecennal time-scales compatible with human society settlement time-scales. In a present and near future context, when human settlement may be affected by strong climatic variation, alluvial dynamics understanding is however a major centre of attention to the development of efficient models. To approach this scale-related question, a segment of the Upper Rhine River presenting both anastomosed and braided was investigated. This area also gives us the opportunity to study settle…
Impacts of oak deforestation and rainfed cultivation on soil redistribution processes across hillslopes using 137Cs techniques
2021
Abstract Background As one of the main components of land-use change, deforestation is considered the greatest threat to global environmental diversity with possible irreversible environmental consequences. Specifically, one example could be the impacts of land-use changes from oak forests into agricultural ecosystems, which may have detrimental impacts on soil mobilization across hillslopes. However, to date, scarce studies are assessing these impacts at different slope positions and soil depths, shedding light on key geomorphological processes. Methods In this research, the Caesium-137 (137Cs) technique was applied to evaluate soil redistribution and soil erosion rates due to the effects …
Étude de deux formations carbonifères du Morvan méridional dans le cadre de l'orogenèse hercynienne (Région du Creusot, Saône-et-Loire).
2006
18 pages; National audience; Dans la région creusotine, deux formations sédimentaires, l'une d'un âge incertain, Dévonien, Dévono-Dinantien, Dinantien, selon les auteurs, et l'autre du Stéphanien supérieur, ont été étudiées. La première nommée Formation (Fm) des Alouettes, est bordée au nord par le granite d'Uchon responsable d'un métamorphisme de contact. Des filons de microgranite la recoupent. Elle est d'abord constituée par une alternance de grès et de siltites laminées charbonneuses dans lesquelles on rencontre des rides de courant, figures d'érosion ainsi que des racines de Lépidophytes (Stigmaria) et des tiges d'Equisétales (Bornia). Cette partie est recouverte par des conglomérats à…
G-Sica 10.1
2013
SOMMAIRE :-*- Introduction / Marc Veyrat ; -1- ©box : InterMade pour un dispositif de médiation ? / Marc Veyrat ; mise en forme graphique Floriane Roussel, Delphine Lorenzetti ; -2- U-RSS en point de fuite. Symposium Texte & Image : une mise en voyage, Université de Malte, 2012 / Franck Soudan, Marc Veyrat ; mise en forme graphique Clara Blanchet, Lise Haudebourg ; -3- Kiss & Fly [ est une oeuvre interactive qui interroge la notion de paysage comme une rencontre de tous les paramètres identitaires d'un lieu ] / Carole Brandon et Arnaud Burgniard ; mise en forme graphique Marie-Albéric Martin, Arnaud Burgniard ; -4- eMotion. Pour une mobilité multi-sensorielle / Ghislaine Chabert, Marc Veyra…
Nomenclatural notes on Fabaceae described from Sicily
2021
A note about some taxa in Anthyllis and Trifolium (Fabaceae) described from Sicily is presented. Concerning Trifolium, we provide the lectotypification of the name T. pratense var. semipurpureum (≡ T. pratense subsp. semipurpureum), using a specimen preserved at PAL (Todaro’s collection). Concerning the Lojacono-Pojero’s name Vulneraria heterophylla var. parvula, it is lectotypified by a specimen at G. A neotype at NAP is proposed for the Gussone’s name Vulneraria heterophylla var. albiflora. As this latter name is applied to a taxon accepted here at specific rank, a new combination is validated. On the contrary, A. heterophylla var. parvula is considered as a new heterotypic synonym of Ant…
Clinico-Biomechanical Issues and Dynamic Stabilization When Considering Stem Cell Treatment for Degenerative Disc Disease
2013
After reading the article published in Transplantation (1), scientists are to be congratulatedVespecially with the clinical results as published. Looking for alternatives to avoid fusion is part of function-preserving spine care, as it should be the last option to be undertaken while keeping the debate open (2, 3). Nevertheless, we would like to point out some questions that arise from a clinical point of view from our daily surgical practice. First, several clinical presentations and procedures are compared without taking into account that they are different treatments applied for different disc disease situations (discectomy is performed for disc herniation with radicular symptoms, disc p…
The Italian TREETALKER NETWORK (ITT-Net): continuous large scale monitoring of tree functional traits and vulnerabilities to climate change
2020
<p>The  <strong>Italian TREETALKER NETWORK (ITT-Net) </strong>aims to respond to one of the grand societal challenges: the impact of climate changes on forests ecosystem services and forest dieback. The comprehension of the link between these phenomena requires to complement the most classical approaches with a new monitoring paradigm based on large scale, single tree, high frequency and long-term monitoring tree physiology, which, at present, is limited by the still elevated costs of multi-sensor devices, their energy demand and maintenance not always suitable for monitoring in remote areas. The ITT-Net network will be a unique and un…
Definition and predictability of an OLR based West African monsoon onset
2008
The monsoon onset is documented in terms of latitudinal shift of deep convection areas within the ITCZ using an interpolated version of the National Oceanic and Atmospheric Administration (NOAA) Outgoing Longwave Radiation (OLR) at a 5-day time-step over West Africa for the period 1979–2004. Signals in moist convection derived from OLR values lower than 180 W/m2 allow better determination of onset dates (ODs) than the use of other thresholds or of the raw values of OLR. Such ODs are defined without any time filtering or spatial averaging along the meridional plane. They are also significantly correlated with ODs based on other datasets such as the CMAP and Global Precipitation Climatology P…
Sea-level changes during the last 41,000 years in the outer shelf of the southern Tyrrhenian Sea: Evidence from benthic foraminifera and seismostrati…
2011
Abstract An integrated high resolution study based both on a seismostratigraphic approach and on a sedimentary core (VIB 10), collected in the outer shelf (127 m depth) from the southern Tyrrhenian Sea (Gulf of Termini, Sicily), provides new data about climatic, eustatic and paleoenvironmental changes during the last ∼41,000 years. The results based on the interpretation of a seismic profile, on benthic foraminifera assemblages and on δ18O records, allowed recognition of two drastic sea-level falls during the Last Glacial Maximum (LGM) and the Younger Dryas (YD). The short deglacial event, between LGM and YD, known as Bolling/Allerod, played an important role in the sea-level rise that prod…