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Der Ursprung des Lebens soll im Ozean gewesen sein. Zumindest dachten Forscher das bis vor kurzem. Eine sensationelle Entdeckung wurde nun aber in Australien gemacht – und diese könnte die Geschichte der kompletten Menschheit umschreiben.
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Es ist ein weiterer Beleg für den Klimawandel: Die Ozeane heizen sich immer schneller auf. Neue Daten zeigen, wie sehr sich Forscher in der Vergangenheit geirrt haben.
Learn more / En savoir plus / Mehr erfahren:
http://www.scoop.it/t/21st-century-innovative-technologies-and-developments/?&tag=Climate-Change
Gust MEES's insight:
Es ist ein weiterer Beleg für den Klimawandel: Die Ozeane heizen sich immer schneller auf. Neue Daten zeigen, wie sehr sich Forscher in der Vergangenheit geirrt haben.
Learn more / En savoir plus / Mehr erfahren:
http://www.scoop.it/t/21st-century-innovative-technologies-and-developments/?&tag=Climate-Change
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A comprehensive, 21-year analysis of the fastest-melting region of Antarctica has found that the melt rate of glaciers there has tripled during the last decade. The glaciers in the Amundsen Sea Embayment in West Antarctica are hemorrhaging ice faster than any other part of Antarctica and are the most significant Antarctic contributors to sea level rise. This study by scientists at the University of California, Irvine (UCI), and NASA is the first to evaluate and reconcile observations from four different measurement techniques to produce an authoritative estimate of the amount and the rate of loss over the last two decades. "The mass loss of these glaciers is increasing at an amazing rate," said scientist Isabella Velicogna, jointly of UCI and NASA's Jet Propulsion Laboratory, Pasadena, California. Velicogna is a coauthor of a paper on the results, which has been accepted for publication in the journal Geophysical Research Letters. Lead author Tyler Sutterley, a doctoral candidate at UCI, and his team did the analysis to verify that the melting in this part of Antarctica is shifting into high gear. "Previous studies had suggested that this region is starting to change very dramatically since the 1990s, and we wanted to see how all the different techniques compared," Sutterley said. "The remarkable agreement among the techniques gave us confidence that we are getting this right." The researchers reconciled measurements of the mass balance of glaciers flowing into the Amundsen Sea Embayment. Mass balance is a measure of how much ice the glaciers gain and lose over time from accumulating or melting snow, discharges of ice as icebergs, and other causes. Measurements from all four techniques were available from 2003 to 2009. Combined, the four data sets span the years 1992 to 2013. Via Dr. Stefan Gruenwald
Gust MEES's insight:
A comprehensive, 21-year analysis of the fastest-melting region of Antarctica has found that the melt rate of glaciers there has tripled during the last decade. The glaciers in the Amundsen Sea Embayment in West Antarctica are hemorrhaging ice faster than any other part of Antarctica and are the most significant Antarctic contributors to sea level rise. This study by scientists at the University of California, Irvine (UCI), and NASA is the first to evaluate and reconcile observations from four different measurement techniques to produce an authoritative estimate of the amount and the rate of loss over the last two decades. "The mass loss of these glaciers is increasing at an amazing rate," said scientist Isabella Velicogna, jointly of UCI and NASA's Jet Propulsion Laboratory, Pasadena, California. Velicogna is a coauthor of a paper on the results, which has been accepted for publication in the journal Geophysical Research Letters. Lead author Tyler Sutterley, a doctoral candidate at UCI, and his team did the analysis to verify that the melting in this part of Antarctica is shifting into high gear. "Previous studies had suggested that this region is starting to change very dramatically since the 1990s, and we wanted to see how all the different techniques compared," Sutterley said. "The remarkable agreement among the techniques gave us confidence that we are getting this right." The researchers reconciled measurements of the mass balance of glaciers flowing into the Amundsen Sea Embayment. Mass balance is a measure of how much ice the glaciers gain and lose over time from accumulating or melting snow, discharges of ice as icebergs, and other causes. Measurements from all four techniques were available from 2003 to 2009. Combined, the four data sets span the years 1992 to 2013.
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Au départ, on l’a pris pour un fou. Maintenant, on le traite de génie. Découvrez Boyan Slat. Boyan Slat vient d'annoncer que son projet fou The Ocean Cleanup est viable. Découvrez comment un entonnoir géant peut nettoyer les océans du plastique.
Gust MEES's insight:
The Ocean Cleanup: 7,25 millions de tonnes de plastique pourraient être récupérés en 5 ans.
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GPS-Daten aus der Westantarktis zeigen Erstaunliches: Das Land hebt sich rapide, unserem Planeten wächst eine Beule - die verändert sogar die Erddrehung und macht die Tage länger. Offenbar liege unter dem Eis eine vulkanisch aktive Zone, ein sogenanntes Backarc-Becken - solche Regionen entstehen hinter der Kollisionsfront zweier Erdplatten: Ein Plattencrash setzt die Erdkruste unter Spannung. Wo sie aufreißt, drängen die zähflüssigen Eingeweide der Erde nach oben. Schließlich läuft Magma aus, wie Blut aus einer Wunde.
Gust MEES's insight:
Offenbar liege unter dem Eis eine vulkanisch aktive Zone, ein sogenanntes Backarc-Becken - solche Regionen entstehen hinter der Kollisionsfront zweier Erdplatten: Ein Plattencrash setzt die Erdkruste unter Spannung. Wo sie aufreißt, drängen die zähflüssigen Eingeweide der Erde nach oben. Schließlich läuft Magma aus, wie Blut aus einer Wunde.
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A ses origines, la Terre ne présentait pas vraiment de condition favorable à l'apparition de la vie. De nouveaux travaux étayent la théorie selon laquelle la vie sur Terre...
En revanche, des conditions plus extrêmes (485.000 - 610.000 bar, 3500 - 4500°C) entrainent la synthèse de méthane et de formaldéhyde, ainsi que des molécules carbonées à longue chaine. Ces composants sont des précurseurs des acides aminés et des composés organiques complexes. Des simulations de chocs thermodynamiques en laboratoire ont produit des quantités significatives de nouveaux composés carbonés azotés "prébiotiques" c'est-à-dire précurseurs de la vie. "Lors de leur impact, les comètes peuvent synthétiser des molécules prébiotiques sans nécessiter de conditions spéciales telles que des radiations ultraviolettes, des catalyseurs, ou de conditions préalables. ===> Ces donnéessont cruciales pour la compréhension du rôle des impacts cosmiques dans la formation des composés élémentaires de la vie sur Terre mais aussi sur d'autres planètes." <===
Gust MEES's insight:
===> Ces données sont cruciales pour la compréhension du rôle des impacts cosmiques dans la formation des composés élémentaires de la vie sur Terre mais aussi sur d'autres planètes." <===
Très intéressant, à lire absolument...
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Great news, everyone! We’re getting better at measuring the changing temperature of the ocean. Unfortunately, the data shows that they are warming more rapidly than researchers thought.
Learn more / En savoir plus / Mehr erfahren:
http://www.scoop.it/t/21st-century-innovative-technologies-and-developments/?&tag=Climate-Change
Gust MEES's insight:
Great news, everyone! We’re getting better at measuring the changing temperature of the ocean. Unfortunately, the data shows that they are warming more rapidly than researchers thought.
Learn more / En savoir plus / Mehr erfahren:
http://www.scoop.it/t/21st-century-innovative-technologies-and-developments/?&tag=Climate-Change
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A strong El Niño event is now underway, but it's not yet clear if it will become the strongest one on record or provide California with much drought relief.
Gust MEES's insight:
A strong El Niño event is now underway, but it's not yet clear if it will become the strongest one on record or provide California with much drought relief.
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A huge expanse of water trapped in a layer of the Earth's mantle could help explain the origin of our oceans
Gust MEES's insight:
A reservoir of water three times the volume of all the oceans has been discovered deep beneath the Earth's surface. The finding could help explain where Earth's seas came from.
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We constantly track our weather as it becomes warmer, or cooler; wetter or drier. But what about the long term - the weather over decades and centuries - at ...
Gust MEES's insight:
Check it out, very interesting...
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http://www.scoop.it/t/21st-century-innovative-technologies-and-developments/?&tag=Life+Origine+on+Earth