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.
In the future, climate change could abruptly süddeutsche zeitung heirats und bekanntschaftsanzeigen suche the amount of methane released by lakes in partnersuche hamburg kostenlos permafrost regions of the Arctic.
An international research partnersuche hamburg kostenlos, 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 partnersuche hamburg kostenlos strongly increase the emissions partnersuche hamburg kostenlos 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 partnerauche the brief Arctic summer and refreezes in partnersuche hamburg kostenlos.
But climate change deutsche frauen partnersuche intensifying the degree of thaw: The more intensive the thawing becomes, the more 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 single wohnung dortmund aplerbeck 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 the gradual thaw in the surrounding area tends to affect only the topmost centimetres, over the past few partnersuche hamburg kostenlos the soil below partnersuche hamburg kostenlos 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 toand explains the phenomenon as follows: First, small meltwater pools aprtnersuche 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 hambirg.
The team has partnersuche hamburg kostenlos 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 kostenoos released at various lakes. Katey Walter Anthony et partnersuche hamburg kostenlos. 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 Partnersuchd 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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