(2020) Mobilized Permafrost Carbon is Concentrated in Particulate Matter and Ebullition Methane in Northern Quebec Thaw Lakes
Gonzalez Moguel R, Douglas P, Bass A, Pilote MP & Garnett M
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10f: Plenary Hall, Thursday 25th June 23:42 - 23:45
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Hi Regina, nice presentation! The oldest ages that you had were 5,000 years old, did I understand correctly that this is also the maximum age of the nearby peat in the region, or is this an averaging process in transport? thanks Sarah
Hi Sarah, thank you for your questions. Yes, the oldest ages we had were 4200 yrs BP in the sediments, and the maximum age measured in peat in a nearby peatland (not our peatland) is 5000 yrs BP, that is when scientists think peat began to accumulate in this region.
Hi Regina, thanks for uploading that clear and concise talk. I think this work is really important and I would love to know more. Similar to Sarah's question, did you sample the nearby carbon sources surrounding the lakes and river? What is the difference between your data for sediment OC and POC? Do you think the lakes are hydrologically-connected to the river, or does the mobilized carbon get trapped there and its ultimate fate is mineralization?
Hi Marisa, Thanks for your questions. 1) We didn't directly sample carbon sources (peat/soil) surrounding the lakes, the data we have to estimate the age sources are from studies dating palsa cores in nearby peatlands. 2) The difference is that we sampled the sediment with a core and then treated the core to remove inorganic components. In the case of POC, we filtered lake water with a 0.75 micrometer filter and then treated the filter to remove inorganic compounds. 3) The river drains several peatlands, including the peatland that we studied, but I am not completely certain that the lakes are connected to the river, that would be a very interesting hypothesis to test as it could tell us more about the fate of this old carbon we are seeing, great thinking!
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