Current State of Sea Ice Cover | Earth J. C. Comiso, C. L. Parkinson, T. Markus, D. The sea ice cover is one of the key components of the polar climate system. Figure 1: 10-year averages between 1979 and 2018 and yearly averages for 2007, 2012, and 2022 of the daily (a) ice extent and (b) ice area in the Northern Hemisphere and a listing of the extent and area of the current, historical mean, minimum, and maximum values in km2. Figure 2: Color-coded map of the daily sea ice concentration in the Northern Hemisphere for the indicated recent date along with the contours of the 15% edge during the years with the least extent of ice (in red) and the greatest extent of ice (in yellow) during the period from November 1978 to the present. Figure 3. Figure 4: Color-coded animation displaying the last 2 weeks of the daily sea ice concentrations in the Northern Hemisphere. Figure 7. Figure 8: Color-coded animation displaying the last 2 weeks of the daily sea ice concentrations in the Southern Hemisphere. J. Figure 3. Figure 7.
Nouveau record de fonte de glace pour le pôle Nord - Sciences L'Arctique fond et fond même à vue de satellite. Des scientifiques de la NASA et du National Snow Ice Data Center (NSIDC) ont expliqué lundi que la calotte glacière a atteint sa plus petite superficie dimanche dernier. Cela fait déjà 30 ans que des satellites permettent de mesurer la banquise de la mer arctique. Ce 26 août 2012, la calotte glacière ne faisait plus que 4,10 millions de kilomètres carrés. Les données sont surprenantes car les experts expliquaient le record de 2007 par un contexte climatique exceptionnel. Mais ce qui étonne les spécialistes cette année c'est la précocité de ce phénomène. Arctic sea ice falls to fifth lowest level on record | Environment Arctic sea ice remained on its death spiral on Wednesday, with the amount of winter ice cover falling to its fifth lowest on the satellite record, scientists at the National Snow and Ice Data Center said. The scientists said Arctic sea ice extent for March averaged 14.80m sq km. That's 730,000 sq km below the 1981-2010 satellite average. The latest findings reinforce a trend that could see the Arctic losing all of its ice cover in the summer months within decades. The world's leading scientists this week admitted that Arctic sea ice was disappearing much faster than expected. “The decline of Arctic sea ice in summer is occurring at a rate that exceeds most model projections,” the United Nations' intergovernment panel on climate change said in releasing its first report since 2007. The report said the loss of sea ice and the melting of permafrost on land were already having knock-on effects in the form of severe storms.
World Glacier Monitoring Service For more than a century, the World Glacier Monitoring Service (WGMS) and its predecessor organizations have been compiling and disseminating standardized data on glacier fluctuations. Thereto, the WGMS annually collects glacier data through its scientific collaboration network that is active in more than 30 countries. More... In close collaboration with the U.S. photo: participants of the WGMS General Assembly 2010 (by F. Lifestyle changes may combat a dementia that strikes people in their 40s and 50s The first symptom is likely a loss of interest in life and the well-being of others. A person might ignore their spouse or children's feelings, get uncharacteristically frustrated and say or do inappropriate things -- such as laugh at a funeral. Even worse, they'll likely have no idea they have changed. "It's a pretty devastating disease that impacts people in the prime of their lives," said neurologist Kaitlin Casaletto, an assistant professor in the Memory and Aging Center at the University of California, San Francisco. Science has struggled to provide interventions to help these patients. Casaletto and her colleagues followed the activity levels of 105 people with the inherited form of the disease, the first study to do so in this population. "This is an extremely important study providing the strongest evidence yet that lifestyle factors can positively impact brain health, not only for Alzheimer's disease, but frontotemporal lobar dementia as well," said neurologist Dr.
Strong Summer Cyclone Churns Over the Arctic An unusually large, long-lasting, and powerful cyclone was churning over the Arctic in early August 2012. Two smaller systems merged on August 5 to form the storm, which at the time occupied much of the Beaufort-Chukchi Sea and Canadian Basin. On average, Arctic cyclones last about 40 hours; as of August 9, 2012, this storm had lasted more than five days. The Visible Infrared Imaging Radiometer Suite (VIIRS) on Suomi NPP captured this view of the storm on August 7, 2012. Arctic cyclones are more common during the summer than winter; however, summer cyclones tend to be weaker than the storms that batter the region during the winter. The number of cyclones affecting the Arctic appears to be increasing. The cause of the increase is an open question, but climate change may be affecting Arctic cyclones. One way climate change may affect Arctic cyclones is by changing the sea ice and ocean temperature. Further Reading NASA. (2008, October 6). Instrument(s): Suomi NPP - VIIRS
Ainsi font font font… la glace Arctique (en 1 minute chrono) | Mécaniques du ciel Ce qui est bien avec la vidéo "en accéléré" ("time-lapse" in english), c'est que si vous avez raté des épisodes, on vous résume l'histoire en quelques secondes. Alors la glace Arctique, font-elle ? Affirmatif ! Cette séquence décrit l'évolution de la banquise Arctique entre 1987 et 2013. ...et la vidéo ICI . Quelques conséquences climatologiques et géopolitiques de la fonte des glaces Cette fonte des glaces devrait avoir, à terme, un impact sur la faune, la flore, mais aussi certainement sur le climat régional de l'Arctique, et, par voix de conséquence, sur la géopolitique de l'Arctique. On lit parfois que l'océan Arctique serait bientôt "libre de glace". Pour plus d'informations, vous pouvez consulter le site du glaciologue français Sylvain Coutterand ICI . On peut lister quelques conséquences d'une fonte de l'Arctique: - Une possible modification des courants océaniques, notamment le Gulf Stream. La fonte des glaces nous réserve aussi quelques surprises, et ce n'est peut-être qu'un début:
SOTC: Introduction NSIDC's State of the Cryosphere provides an overview of the status of snow, ice, and permafrost as indicators of climate change. This site provides time-series data for Northern Hemisphere snow cover, mountain glacier fluctuations, sea ice extent and concentration, changes in ice shelves, and global sea level. It also provides a snapshot of current permafrost conditions. Image credits clockwise from top left: Formosat image of icebergs © 2008 Dr. Cheng-Chien Liu, National Cheng-Kung University and Dr. An-Ming Wu, National Space Organization, Taiwan; photo of ptarmigan tracks by Andrew Slater, NSIDC; photo of James Ross Island by Rob Bauer, NSIDC; International Space Station astronaut photo of Pared Norte Glacier courtesy NASA. Introduction: Are global temperatures rising? Northern Hemisphere Snow: What satellite sensors are telling us about snow cover Glaciers: Mountain glacier fluctuations Permafrost and Frozen Ground: Insights from a Northern Hemisphere map and field observations
Alzheimer's Found To Be Mostly Genetic: Largest Twin Study Ever Undertaken Confirms Highest Estimates Of Genetic Risk -- ScienceDaily Alzheimer disease has a genetic cause in up to 80 percent of cases, according to a University of Southern California- led study of nearly 12,000 twin pairs. The study appears in the February 2006 issue of Archives of General Psychiatry, a journal of the American Medical Association. Margaret Gatz, professor of psychology in the USC College of Letters, Arts, and Sciences, led an international team of researchers from Göteborg University, Jönköping University and Karolinska Institutet in Sweden, as well as from USC, the University of California at Riverside and the University of South Florida. Past estimates of Alzheimer's risk varied widely, with the highest numbers sometimes greeted with skepticism. "Our finding confirms the higher estimates that have been suggested previously. The study raises doubts about the widely held view that Alzheimer's has two forms: the "familial," with genetic roots, and the "sporadic," with environmental causes.
La banquise arctique pourrait complètement disparaître d'ici à quatre ans La fonte des glaces de mer du pôle Nord s'accélère au point qu'elles pourraient avoir totalement disparu, en été, entre 2015 et 2016, selon Peter Wadhams, de l'université de Cambridge. Le Monde.fr | • Mis à jour le | Par Audrey Garric La fonte de la banquise arctique s'accélère au point qu'elle pourrait avoir totalement disparu en été d'ici à quatre ans. Wadhams, qui dirige le département de physique de l'océan polaire à l'université de Cambridge, en Angleterre, a passé de nombreuses années à recueillir des données sur l'épaisseur de la glace grâce aux mesures de sous-marins parcourant l'océan Arctique. Cette année, le retrait des glaces s'annonce bien plus important : la banquise Arctique – la zone de l'océan où au moins 15 % de la surface est glacée – ne s'étend pour l'instant plus que sur 3,4 millions de km2 et elle continue de reculer, comme le montre le suivi quotidien du National Snow and Ice Data Center (NSIDC) américain. "UNE CATASTROPHE MONDIALE" en 2015 OU 2016
Arctic sea ice delusions strike the Mail on Sunday and Telegraph | Dana Nuccitelli | Environment When it comes to climate science reporting, the Mail on Sunday and Telegraph are only reliable in the sense that you can rely on them to usually get the science wrong. This weekend's Arctic sea ice articles from David Rose of the Mail and Hayley Dixon at the Telegraph unfortunately fit that pattern. Both articles claimed that Arctic sea ice extent grew 60 percent in August 2013 as compared to August 2012. While this factoid may be technically true (though the 60 percent figure appears to be an exaggeration), it's also largely irrelevant. For one thing, the annual Arctic sea ice minimum occurs in September – we're not there yet. And while this year's minimum extent will certainly be higher than last year's, that's not the least bit surprising. "Around 80% of the ~100 scientists at the Bjerknes [Arctic climate science] conference thought that there would be MORE Arctic sea-ice in 2013, compared to 2012." Regression toward the Mean When Will the Arctic be Ice-Free? Continuing Global Warming
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