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(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

Regina Gonzalez Moguel
Peter Douglas View all 3 abstracts at Goldschmidt2020 View abstracts at 9 conferences in series
Adrian Bass
Martin Pilote Pilote View all 2 abstracts at Goldschmidt2020
Mark Garnett

Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.

Submitted by Sarah Feakins on Thursday 25th June 03:30
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.

Submitted by Marisa Repasch on Thursday 25th June 19:58
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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