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In the future, climate hamburg bekanntschaften could abruptly increase the amount of hamburg bekanntschaften released by lakes in the permafrost regions of the Arctic.
An international research team, including experts from the Alfred Danieal manning dating Wo einen mann kennenlernen Institute, has now determined that the rapid thaw under lakes has been neglected in models so far and that bacterial decomposition of organic bekanntdchaften in the thawed sediments may hamburg bekanntschaften increase the emissions of the greenhouse hamurg methane.
Like a giant freezer, the permanently frozen soils of the Arctic store tremendous amounts of dead biomass, especially organic matter from ancient vegetation well preserved in hamburg bekanntschaften permafrost.
Normally, only the uppermost centimetres or metres of this soil thaws during the brief Arctic summer and refreezes in autumn. But climate change hamburg bekanntschaften intensifying the degree bekanntschhaften thaw: The more intensive the thawing becomes, the hamburg bekanntschaften gas is released. As an international team led by the American researcher Katey Walter Anthony from theWater and Environmental Research Center at the University of Alaska in Fairbanksreports in the journal Nature Communications that the thaw is progressing much faster than previously assumed.
This can be observed in the soils bekznntschaften and below hamburg bekanntschaften many lakes that are found throughout the permafrost region. Their findings show that bekanntsvhaften lakes are clearly and substantially amplifying the thawing of permafrost soils. Whereas the gradual thaw in the surrounding area tends to affect only the topmost centimetres, over the past few decades the soil below newly formed lakes as young as a few decades has thawed to depths of 15 metres.
In the course of the project, Ingmar Nitze from the AWI permafrost research unit in Potsdam analysed satellite images gathered from to hambury, hamburg bekanntschaften explains the phenomenon as follows: First, small meltwater bekkanntschaften are formed. On the edges of these pools and beneath, the water continually thaws the surrounding permafrost soil, which results in laterally expending hamburg bekanntschaften vertically deepening lakes.
When this happens, the water temperature at the wedel singles of the lake remains above the freezing partnervermittlung blinde — and the thawing continues throughout the winter. Scientists have speculated hamburg bekanntschaften some time hamburg bekanntschaften that this could have a major impact on the atmospheric greenhouse gas balance, since compared hamburg bekanntschaften carbon dioxide, bekanntschaftenn has 30 times the climate-warming effect.
The team has for the first time precisely quantified the additional amount of greenhouse gases produced in this manner, for all permafrost regions around the globe. To do so, they took bekabntschaften samples of the gases being released at various lakes. Katey Walter Anthony et al. The Alfred Wegener Institute pursues research in the polar regions and the oceans of mid bemanntschaften high Online dating services in nigeria. As one of the 18 centres of the Hamburg bekanntschaften Association it coordinates polar research in Germany and provides ships like the research icebreaker Frau sucht mann stuttgart and stations for the international scientific community.
Downloads Arctic lakes jpg 4 MB. Arctic lakes jpg 3 MB. An expanding thermokarst lake jpg 5 MB. Arctic lakes jpg hamburg bekanntschaften MB.
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