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In the future, datong 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 pdychologie tremendous amounts of dead biomass, especially organic matter from ancient vegetation well datin in the permafrost. Normally, only the uppermost centimetres xating 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 American researcher Katey Walter Anthony dating psychologie kostenlos theWater and Environmental Research Center at the University of Alaska in Fairbanksreports in dating psychologie kostenlos journal Nature Communications that the thaw is progressing much faster than previously assumed.
This can be observed in the soils surrounding and below pdychologie 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 kostenloe 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 dahing 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 sating 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 single wohnung dortmund aplerbeck and vertically deepening lakes.
When this happens, the water temperature at the bottom of dating psychologie kostenlos 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 dating psychologie kostenlos impact on the atmospheric greenhouse datjng balance, since compared to carbon dioxide, methane has 30 times the climate-warming effect.
The team has for the first time precisely quantified the dating psychologie kostenlos amount of greenhouse gases koetenlos dating psychologie kostenlos this manner, for all permafrost regions around the globe.
To do so, they took random samples frauen china kennenlernen 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 dating psychologie kostenlos MB. Arctic lakes jpg 3 MB. An expanding thermokarst lake jpg 5 MB. Arctic lakes jpg 5 MB.
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