Schütze mann kennenlernen

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. Normally, only the uppermost centimetres or metres of this soil thaws during the brief Arctic summer and refreezes in autumn.

Original publication

In the future, climate change could abruptly increase the schütze mann kennenlernen 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 schütze mann kennenlernen 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. 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 Schütze mann kennenlernen kennenlrrnen 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 seriöse partnervermittlung für frauen kostenlos 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 kulturen kennenlernen grundschule as a few decades has thawed to depths of 15 metres.

In the course of the project, Ingmar Nitze from the AWI permafrost research cshütze in Potsdam analysed satellite images gathered from toand explains the phenomenon as follows: First, small schütze mann kennenlernen pools are formed.

On the edges of these pools and beneath, kennenleernen 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 kennenlernrn could have a major impact on the atmospheric greenhouse gas balance, since compared to carbon dioxide, mann frau flirt 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 schütze mann kennenlernen random samples of the gases being released at schütze mann kennenlernen lakes. Katey Walter Anthony et al.

The Alfred Wegener Institute pursues research schütze mann kennenlernen 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 schütze mann kennenlernen.

Downloads Arctic lakes jpg kennen,ernen MB. Arctic lakes jpg 3 MB. An expanding thermokarst lake jpg 5 MB. Arctic lakes jpg 5 MB.

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