National Climate Assessment: 21st Century Precipitation Scenarios. EarthID: 4028 These visualizations show model projections of the precipitation anomaly from 2000 to 2100 as a percentage difference between the 30-year precipitation averages and the 1970-1999 average.
The dates displayed represent the center of the 30-year average; so, the 30-year spans are +/- 15 years from the displayed dates. The percentages are computed as follows: 100% x ( (30-year span) - (1970-1999 span) ) / (1970-1999 span). Separate animations are shown for annual averages and for seasonal averages in the United States. Spring precipitation is displayed to demonstrate the strong drying signal in the southwest. The data are from fifteen coupled Atmosphere-Ocean General Circulation Models (AOGCMs) from the World Climate Research Programme (WCRP) CMIP3 multi-model dataset (PCMDI 2012). These climate model runs use assumptions about possible future development patterns and scenarios of greenhouse gas emission rates. Related. Say goodbye to major cities if these scientists are right about Antarctica’s collapsing ice. This story was originally published by the Guardian and is reproduced here as part of the Climate Desk collaboration.
Sea levels could rise far more rapidly than expected in coming decades, according to new research that reveals Antarctica’s vast ice cap is less stable than previously thought. The U.N.’s climate science body had predicted up to a meter of sea-level rise this century — but it did not anticipate any significant contribution from Antarctica, where increasing snowfall was expected to keep the ice sheet in balance. Advertisement – Article continues below According a study, published in the journal Nature, collapsing Antarctic ice sheets are expected to double sea-level rise to two meters by 2100, if carbon emissions are not cut.
Previously, only the passive melting of Antarctic ice by warmer air and seawater was considered but the new work added active processes, such as the disintegration of huge ice cliffs. “This is the good news,” he said. Arctic sea ice hits another record low. The National Snow and Ice Data Center (NSIDC) reports that a record amount of the Arctic sea never froze this winter.
Ice extent, which usually hits a wintertime maximum around mid-March, was at a record-low for the second year in a row, 5,000 square miles below 2015’s record-low maximum extent. This year’s maximum extent is 431,000 square miles below averages from 1981 to 2010. It’s a pattern that will likely continue, according to NASA Arctic sea scientist Walter Meier. “It is likely that we’re going to keep seeing smaller wintertime maximums in the future because in addition to a warmer atmosphere, the ocean has also warmed up,” Meier said. The amount of sea ice can vary a lot from year to year, but we’re seeing “significant downward trend” from warming conditions, Meier added. Ensemble, nous pouvons refroidir la planète ! Depuis plusieurs années déjà, La Vía Campesina et GRAIN dénoncent le système d’alimentation agroindustriel qui cause la moitié des émissions de gaz à effet de serre de la planète.
Mais les gouvernements refusent de s’attaquer sérieusement à ces problèmes. Et le Sommet de Paris de décembre approche à grands pas sans aucun engagement solide pour les résoudre. Cette nouvelle vidéo de La Vía Campesina et GRAIN décrit les éléments nécessaires pour comprendre les effets du système agroindustriel sur notre climat et nous explique en même temps comment nous pouvons agir pour renverser la vapeur et commencer à refroidir la planète. Postwaves - Climate Think Tank, Top Posts. Climate Change.
The scientist who first warned of climate change says it’s much worse than we thought. The rewards of being right about climate change are bittersweet.
James Hansen should know this better than most — he warned of this whole thing before Congress in 1988, when he was director of NASA’s Institute for Space Studies. At the time, the world was experiencing its warmest five-month run since we started recording temperatures 130 years earlier. Hansen said, “It is time to stop waffling so much and say that the evidence is pretty strong that the greenhouse effect is here.” Fast forward 28 years and, while we’re hardly out of the Waffle House yet, we know much more about climate change science. Hansen is still worried that the rest of us aren’t worried enough. Last summer, prior to countries’ United Nations negotiations in Paris, Hansen and 16 collaborators authored a draft paper that suggested we could see at least 10 feet of sea-level rise in as few as 50 years. COP 21 : ratifier c'est bien, changer de politique, c'est mieux.
A frightening record: Carbon dioxide levels show biggest-annual jump. Recently, we’ve had more reason than usual to be optimistic on climate change — the world reached its first truly global climate agreement in December, there are a lot of signs that China is getting serious about its emissions, and coal is facing economic collapse in the U.S.
But there’s just as much news to sour this outlook, particularly when you look at what’s happening to carbon dioxide. The National Oceanic and Atmospheric Administration has reported the biggest 12-month jump in carbon dioxide concentrations since record-keeping began, based on preliminary data from its Earth Science Research Lab in Mauna Loa. From February 2015 to 2016, the global concentration of carbon in the atmosphere rose a record 3.76 parts per million (ppm), to over 404 ppm. The last record-holder was 1997-1998, when carbon dioxide rose 3.70 ppm. Meanwhile, 2015 was the hottest year on record. Well then.