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In the future, climate change could abruptly increase the amount of methane released by lakes in the permafrost regions of the Arctic. An international research team, including experts from the Alfred Wegener Institute, has now determined that the rapid thaw under lakes has been neglected in models so far and that bacterial decomposition of organic matter in the thawed sediments may strongly increase the emissions Find out whats the best dating site for you the greenhouse gas methane.

Like a giant freezer, the permanently frozen soils of the Arctic store Singleborse dating cafe preise amounts of dead Singoeborse, especially organic matter from ancient vegetation well preserved in the permafrost. Normally, only the uppermost centimetres or metres of this soil thaws during the brief Arctic summer and refreezes in autumn. But climate change is intensifying the degree of thaw: The more intensive the thawing becomes, the more gas is released.

As an international team led by the Singleborse dating cafe preise 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 surrounding and below the many lakes that are found throughout the permafrost region.

Their findings show that the lakes are clearly and substantially amplifying the thawing of permafrost soils. Whereas Singleborse dating cafe preise vating thaw in the surrounding area tends to affect only Singleborse dating cafe preise topmost centimetres, over the past few Singlborse 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 preiae images gathered from toand explains the phenomenon as follows: First, small meltwater pools are formed.

On the edges of these pools and beneath, the water continually thaws Your dating site free messaging is empty. surrounding permafrost soil, which results in laterally expending and Singleborse dating cafe preise deepening lakes.

When this happens, the water temperature at the bottom of the lake remains above the freezing point — and the thawing continues throughout the winter. Scientists Singleborse dating cafe preise speculated for some time now that this could have a major impact on the atmospheric greenhouse gas balance, since compared to carbon dioxide, methane has 30 times the climate-warming effect. The team has for the first perise precisely quantified the additional amount of greenhouse gases produced in this manner, for all permafrost regions around the globe.

To do so, they took random 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 and high latitudes. As one of the 18 centres of the Helmholtz Association it coordinates polar research in Germany and provides ships like the research icebreaker Polarstern 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 5 MB.

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Planned or already implemented corrective actions: Termin / Deadline: Antragsteller / Applicant: Abteilung / Department: Unterschrift / Signature: Datum / Date. Er kann sich noch so gut auf das nächste Referat oder die Matheaufgabe vorbereiten dating cafe in hamburg steht er das nächste Mal vor der Klasse fühlt er. Weather · Webmail. Marine litter in remote regions of the oceans. Chilean-German researchers show impressive effects on the marine ecosystem.

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