July 28, 2020 – Alaska is getting wetter. Bundesstaat der USA, hat eine Nord-Süd-Ausdehnung von 2.300 Kilometern und eine Ost-West-Ausdehnung von knapp 4.000 Kilometern. After the wettest summer in 2014, permafrost didn’t freeze back to previous levels even after subsequent summers were drier. Mit dem Klima in Alaska im August wissen, wie warm es wird. You can be assured our editors closely monitor every feedback sent and will take appropriate actions. Charlie Koven, an Earth system modeler with the Lawrence Berkeley National Laboratory, used the field measurements to build a heat balance model that allowed the team to better understand how rain was driving heat down into the permafrost ground.The study demonstrates how land cover types govern relationships between summer rainfall and In the meantime, rainfall—and the research—continue. The five-year period included two summers with average precipitation, one that was a little drier than usual, and the top and third wettest summers on record. While permafrost was frozen closest to the surface in tussock tundra, it experienced the greatest relative increase in the depth of thaw in response to rainfall, possibly because water could pool on the flat surface. Differences in annual rainfall were clearly imprinted in the amount of permafrost thaw.More rainfall led to deeper thaw across all sites. As the earth warms, temperatures in the Arctic rise faster than the global average.While the physical basis of Arctic amplification is well understood, it is less known how it will affect the permafrost that underlies about a quarter of the Northern Hemisphere, including most of Alaska. While permafrost was frozen closest to the surface in tussock tundra, it experienced the greatest relative increase in the depth of thaw in response to rainfall, possibly because water could pool on the flat surface. Die nördliche Lage, die enorme Landmasse, die Topografie und der Pazifik sind klimabestimmend für Alaska, wobei eskein einheitliches Klimagibt. You can unsubscribe at any time and we'll never share your details to third parties. Your opinions are important to us. Tussock tundra, with its deep soils and covering of tufted grasses, has been found to provide the most ecosystem protection of permafrost. Permafrost locks about twice the carbon that is currently in the atmosphere into long-term storage and supports Northern infrastructure like roads and buildings; so understanding how a changing climate will affect it is crucial for both people living in the Arctic and those in lower latitudes. This document is subject to copyright. Alaska liegt auf dem 54. bis 71. Those conditions may lead to a feedback loop between more permafrost thaw and wetter summers.In the meantime, rainfall—and the research—continue. It is extremely wet out there. Het klimaat van Alaska laat zich in een paar verschillende klimaatzones indelen. "In our research area the winter has lost almost three weeks to summer," says study lead author and Fairbanks resident Thomas A. Douglas, who is a scientist with the U.S. Army Cold Regions Research and Engineering Laboratory.
Updated: August 31, 2019 ; Wetlands and disturbed sites, like trail crossings and clearings, showed the most thaw. Permafrost locks about twice the carbon that is currently in the atmosphere into long-term storage and supports Northern infrastructure like roads and buildings; so understanding how a changing climate will affect it is crucial for both people living in the Arctic and those in lower latitudes.“In our research area the winter has lost almost three weeks to summer,” says study lead author and Fairbanks resident Thomas A. Douglas, who is a scientist with the U.S. Army Cold Regions Research and Engineering Laboratory. Het zuidoosten van Alaska, waar je hoofdstad Juneau vindt, heeft een gematigd zeeklimaat (type Cfb) volgens de Köppen-Geiger klimaatclassificatie.Met gemiddeld ongeveer 1300 millimeter per jaar is dit een vrij nat deel van Alaska, het is echter ook het warmste gebied binnen deze staat. A new study spells out what that means for the permafrost that underlies about 85% of the state, and the consequences for Earth's global climate. Medical Xpress covers all medical research advances and health news Tech Xplore covers the latest engineering, electronics and technology advances Science X Network offers the most comprehensive sci-tech news coverage on the web Your email address is used ""This study adds to the growing body of knowledge about how Your feedback will go directly to Science X editors.Thank you for taking your time to send in your valued opinion to Science X editors.
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