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Thermokarst lakes are thought to have been an important source of methane (CH4) during the last deglaciation when atmospheric CH4 concentrations increased rapidly. Here we demonstrate that meltwater from permafrost ice serves as an H source to CH4 production in thermokarst lakes, allowing for region-specific reconstructions of ?DCH4 emissions from Siberian and North American lakes. ?DCH4 reflects regionally varying ?D values of precipitation incorporated into ground ice at the time of its formation. Late Pleistocene-aged permafrost ground ice was the dominant H source to CH4 production in primary thermokarst lakes, whereas Holocene-aged permafrost ground ice contributed H to CH4 production in later generation lakes....
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The article presents a study which focuses on the use of ground penetrating radar detection of subsnow liquid overflow on the ice-covered lakes in Alaska. The study used general packet radio service (GPR) in measuring three thermokarst lakes in interior Alaska. The study revealed three lakes have 30-70 cm snow thickness, 49-65 cm ice thickness, and 0 to 695 water depth.
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