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| Institut Méditerranéen d'Ecologie et de Paléoécologie - IMEP |
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 SagaScience
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Le climat change-t-il ? |
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| A télécharger ... Les recherches françaises sur les changements climatiques en 2007 | ||||
| Changement climatique : la biodiversité européenne en danger | ||||
| A télécharger ... Gestion et Impacts du changement climatique |
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Écosystèmes et Événements climatiques extrême Colloque organisé à l’initiative de Jean Dercourt, Secrétaire perpétuel de l'Académie des sciences Programme et résumés (pdf 335 Ko) |
Biological Diversity and Climate Change
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Cartes mises à jour du climat en Europe (NOAA / Climate Prediction Center) |
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| Consensus Scientifique sur le Changement Climatique et le réchauffement de la planète | ||||
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Cité des sciences et de l'industrie - Paris CCSTI de Grenoble ARCHIVES DES MANIFESTATIONS PASSEES Montréal, 28 novembre - 9 décembre 2005 Lors de cette réunion, se sont tenues à la fois la 11° session de la Conférence des Parties (COP 11) et la 1° réunion des parties du Protocole de Kyoto (COP/MOP 1). |
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Rapid Sea Level Rise In The Arctic Ocean May Alter Views Of Human Migration Scientists have found new evidence that the Bering Strait near Alaska flooded into the Arctic Ocean about 11,000 years ago, about 1,000 years earlier than widely believed, closing off the land bridge thought to be the major route for human migration from Asia to the Americas. |
Researchers Link Ice-Age Climate-Change Records to Ocean Salinity Sudden decreases in temperature over Greenland and tropical rainfall patterns during the last Ice Age have been linked for the first time to rapid changes in the salinity of the north Atlantic Ocean, according to research published Oct. 5, 2006, in the journal Nature. The results provide further evidence that ocean circulation and chemistry respond to changes in climate. Using chemical traces in fossil shells of microscopic planktonic life forms, called formanifera, in deep-sea sediment cores, scientists reconstructed a 45,000- to 60,000-year-old record of ocean temperature and salinity. They compared their results to the record of abrupt climate change recorded in ice cores from Greenland. They found the Atlantic got saltier during cold periods, and fresher during warm intervals. |
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Ecological Change, Climate Variation Addressed at International Conference Ecosystem responses to increasing urbanization in cities like Phoenix, links between declining Eastern hemlock trees and river and stream ecosystems, coral reef dependence on symbiotic crabs, and the history and future of long-term ecological research are among subjects to be addressed at the 6th Long-Term Ecological Research All-Scientists Meeting, sponsored by the National Science Foundation (NSF). |
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First compilation of Tropical Ice Cores shows Abrupt Global Climate ShiftsFor the first time, glaciologists have combined and compared sets of ancient climate records trapped in ice cores from the South American Andes and the Asian Himalayas to paint a picture of how climate has changed – and is still changing – in the tropics. The locations of ice cores and evidence for abrupt climate change approximately 5,000 years ago discussed in the research are shown, along with areas of large-scale ice retreat. |
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Understanding and predicting Desertification: Researchers offer new insights on Arid, Semiarid Landscapes A team of researchers has developed a multi-faceted process to study arid and semiarid landscapes that takes into account the wide range of factors influencing changes that can result in desertification. |
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Sun's Past Strength Took Toll On Tropical Glaciers, Worsens Today's Outlook Variations in the strength of the sun have played a major role in glacial fluctuations in the tropical Andes for hundreds of years, and combined with current greenhouse gases generated by humans, paint an alarming picture for tropical glaciers in the near future. |
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New Forecast: Hot and HotterIf Earth's past climate cycles are any indication, temperatures could be significantly hotter by the end of the century than current climate models predict. New research suggests that current atmospheric models underestimate future global warming. |
Taking Evolution's Temperature: Researchers Pinpoint The Energy It Takes To Make A Species Writing this week in the Proceedings of the National Academy of Sciences, scientists say higher temperatures near the equator speed up the metabolisms of the inhabitants, fueling genetic changes that actually lead to the creation of new species |
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Linking Climate Change Across Time ScalesWhat do month-to-month changes in temperature have to do with century-to-century changes in temperature? At first it might seem like not much. But in a report published in this week’s Nature, scientists from the Woods Hole Oceanographic Institution (WHOI) have found some unifying themes in the global variations of temperature at time scales ranging from a single season to hundreds of thousands of years. These findings help place climate observed at individual places and times into a larger global and temporal context. |
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Ice Core Extends Climate Record Back 650,000 Years Researchers have recovered a nearly two-mile-long cylinder of ice from eastern Antarctica that contains a record of atmospheric concentrations of carbon dioxide (CO2) and methane--two potent and ubiquitous greenhouse gases--spanning the last two glacial periods. Analysis of this core shows that current atmospheric concentrations of CO2--380 parts per million (ppm)--are 27 percent higher than the highest levels found in the last 650,000 years. |
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| Le climat change | ||||
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Sun's Past Strength Took Toll On Tropical Glaciers, Worsens Today's Outlook Variations in the strength of the sun have played a major role in glacial fluctuations in the tropical Andes for hundreds of years, and combined with current greenhouse gases generated by humans, paint an alarming picture for tropical glaciers in the near future. |
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New Forecast: Hot and Hotter If Earth's past climate cycles are any indication, temperatures could be significantly hotter by the end of the century than current climate models predict. New research suggests that current atmospheric models underestimate future global warming. Scientists say the estimates don't account for soil decomposition and other natural processes that are expected to escalate in response to ongoing warming, thus amplifying greenhouse gas production. |
Taking Evolution's Temperature: Researchers Pinpoint The Energy It Takes To Make A Species Writing this week in the Proceedings of the National Academy of Sciences, scientists say higher temperatures near the equator speed up the metabolisms of the inhabitants, fueling genetic changes that actually lead to the creation of new species |
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La moitié des plantes d'Europe menacées par le changement climatique PARIS (AFP) - Plus de la moitié des plantes européennes pourraient être classées "vulnérables" ou "menacées", selon les critères de l'Union Internationale pour la Conservation de la Nature (UICN), à cause des changements climatiques à l'horizon 2080, selon une étude publiée lundi. Wilfried Thuiller, un jeune chercheur français actuellement basé à l'Institut Sud-Africain pour la Biodiversité (SANBI, Le Cap), et ses collaborateurs ont modélisé les déplacements de 1.350 espèces végétales européennes à l'horizon 2080 par rapport au climat actue l. Leurs travaux, publiés dans les comptes-rendus de l'Académie des sciences américaine (PNAS), ont utilisé sept scénarios des experts du Groupe Inter-gouvernemental sur les Changements Climatiques (GICC) reflétant différentes réponses politiques et socio-économiques aux changements climatiques. |
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Plants' role in global warming re-examined in ORNL Science paper OAK RIDGE, Tenn., May 1, 2006 — Estimates of increased plant respiration in response to higher global temperatures may be somewhat overstated as they have not taken into account plants' ability to adjust to changing conditions, according to researchers from Oak Ridge National Laboratory. In a Perspectives paper published April 28 by Science, a team led by Tony King cites ORNL findings suggesting that about 9 percent more carbon will be stored in plants and soil with the acclimation of plants included in the model. While this amount is relatively small compared to different climate-carbon simulations performed over the years, the authors note that this acclimation phenomenon should not be ignored. |
L'ampleur des changements climatiques, de leurs causes et de leur impact possible sur la géographie de la France à l'horizon 2005, 2050 et 2100 Tome 1 Tome 2 |
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Forêts et changement climatique : l’aménagement joue un rôle clé Le changement climatique et les forêts sont indissolublement liés. D’une part, les forêts subissent déjà les conséquences de la modification du climat de la planète par un accroissement des températures annuelles moyennes, une altération des régimes de précipitations et des phénomènes météorologiques extrêmes plus fréquents. D’autre part, les forêts et le bois qu’elles produisent piègent et stockent le dioxyde de carbone, jouant un rôle essentiel dans l’atténuation du changement climatique. Revers de la médaille : lorsqu’elles sont détruites ou surexploitées et incendiées, les forêts peuvent devenir des sources de gaz à effet de serre, le dioxyde de carbone. |
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En Europe, la diversité végétale est menacée par le réchauffement C'est entendu : une grande part de la biodiversité végétale et animale se trouve dans les forêts humides des zones tropicales et subtropicales. Et, pour ces riches écosystèmes, la principale menace, à très court terme, est incarnée par le rythme soutenu de la déforestation. Les écosystèmes européens sont, eux, plus particulièrement mis en danger d'appauvrissement par le réchauffement climatique en cours. |
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Biggest-ever climate simulation warns temperatures may rise by 11 ºC. The greenhouse effect could be far more severe than experts had previously predicted, according to results from the world's biggest climate-modelling study. In the worst-case scenario, doubling carbon-dioxide levels compared with pre-industrial times increases global temperatures by an average of more than 11 ºC. |
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Global warming is getting worse - but the message is getting through In a Guardian article a year ago, I called Global Warming a weapon of mass destruction. I warned that events such as heat waves, floods and droughts will be more frequent and destructive as more carbon dioxide enters the atmosphere from the burning of fossil fuels - coal, oil and gas. |
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Climate fear as carbon levels soar An unexplained and unprecedented rise in carbon dioxide in the atmosphere two years running has raised fears that the world may be on the brink of runaway global warming. Scientists are baffled why the quantity of the main greenhouse gas has leapt in a two-year period and are concerned that the Earth's natural systems are no longer able to absorb as much as in the past. The findings will be discussed tomorrow by the government's chief scientist, Dr David King, at the annual Greenpeace business lecture | ||||
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