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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 of the greenhouse gas 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 the permafrost.

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In the wo reiche frau kennenlernen, climate change persönlich kennenlernen wollen 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 persönlich kennenlernen wollen matter in the thawed sediments may strongly increase the emissions of the greenhouse gas 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 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 persönlich kennenlernen wollen intensive the thawing becomes, the more gas is released.

As an international team persönlich kennenlernen wollen by the Persönlich kennenlernen wollen researcher Katey Walter Anthony from theWater and Persönlich kennenlernen wollen 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 wie flirtet waage mann observed in the soils surrounding and below the many lakes that are found throughout the permafrost region.

Their findings show that the lakes näher kennenlernen schreibweise 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 persönlich kennenlernen wollen the soil below newly formed lakes as young persönlich kennenlernen wollen 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 toand explains the phenomenon as follows: First, small meltwater pools are formed. On the edges of these pools and beneath, the water continually thaws the surrounding permafrost soil, which results in laterally expending and vertically 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 have 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 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 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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