{"refrec":{"BRefID":337214,"RR":"<b>Meisel, O.H.; Dean, J.F.; Vonk, J.E.; Wacker, L.; Reichart, G.-J.; Dolman, H.</b> (2021). Porewater <i>δ</i><sup>13</sup>C<sub>DOC</sub> indicates variable extent of degradation in different talik layers of coastal Alaskan thermokarst lakes. <i>Biogeosciences 18(7)</i>: 2241-2258. <a href=\"https://doi.org/10.5194/bg-18-2241-2021\" target=\"_blank\">https://doi.org/10.5194/bg-18-2241-2021</a>","BEntID":333836,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Biogeosciences 18(7)</i>: 2241-2258. <a href=\"https://doi.org/10.5194/bg-18-2241-2021\" target=\"_blank\">https://doi.org/10.5194/bg-18-2241-2021</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Meisel, O.H.; Dean, J.F.; Vonk, J.E.; Wacker, L.; Reichart, G.-J.; Dolman, H.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Meisel, O.H. <i>et al.</i>","Englishabstract":"Thermokarst lakes play an important role in permafrost environments by    warming and insulating the underlying permafrost. As a result, thaw bulbs    of unfrozen ground (taliks) are formed. Since these taliks remain    perennially thawed, they are zones of increased degradation where microbial    activity and geochemical processes can lead to increased greenhouse gas    emissions from thermokarst lakes. It is not well understood though to what    extent the organic carbon (OC) in different talik layers below thermokarst    lakes is affected by degradation. Here, we present two transects of short    sediment cores from two thermokarst lakes on the Arctic Coastal Plain of    Alaska. Based on their physiochemical properties, two main talik layers    were identified. A “lake sediment” is identified at the top with low    density, sand, and silicon content but high porosity. Underneath, a    “taberite” (former permafrost soil) of high sediment density and rich in    sand but with lower porosity is identified. Loss on ignition (LOI)    measurements show that the organic matter (OM) content in the lake sediment    of 28±3 wt % (1<i>σ</i>, <i>n</i>=23) is considerably higher than in the    underlying taberite soil with 8±6 wt % (1<i>σ</i>, <i>n</i>=35), but    dissolved organic carbon (DOC) leaches from both layers in high    concentrations: 40±14 mg L<sup>−1</sup> (1<i>σ</i>, <i>n</i>=22) and    60±14 mg L<sup>−1</sup> (1<i>σ</i>, <i>n</i>=20). Stable carbon isotope    analysis of the porewater DOC (<i>δ</i><sup>13</sup>C<sub>DOC</sub>) showed    a relatively wide range of values from −30.74 ‰ to −27.11 ‰ with a mean of    −28.57±0.92 ‰ (1<i>σ</i>, <i>n</i>=21) in the lake sediment, compared to a    relatively narrow range of −27.58 ‰ to −26.76 ‰ with a mean of    −27.59±0.83 ‰ (1<i>σ</i>, <i>n</i>=21) in the taberite soil (one outlier at    −30.74 ‰). The opposite was observed in the soil organic carbon (SOC), with    a narrow <i>δ</i><sup>13</sup>C<sub>SOC</sub> range from −29.15 ‰ to    −27.72 ‰ in the lake sediment (−28.56±0.36 ‰, 1<i>σ</i>, <i>n</i>=23) in    comparison to a wider <i>δ</i><sup>13</sup>C<sub>SOC</sub> range from−27.72 ‰ to −25.55 ‰ in the underlying taberite soil (−26.84±0.81 ‰, 1<i>σ</i>, <i>n</i>=21). The wider range of porewater <i>δ</i><sup>13</sup>C    <sub>DOC</sub> values in the lake sediment compared to the taberite soil,    but narrower range of comparative <i>δ</i><sup>13</sup>C<sub>SOC</sub>,along with the <i>δ</i><sup>13</sup>C-shift from <i>δ</i><sup>13</sup>C    <sub>SOC</sub> to <i>δ</i><sup>13</sup>C<sub>DOC</sub> indicates increased    stable carbon isotope fractionation due to ongoing processes in the lake    sediment. Increased degradation of the OC in the lake sediment relative to    the underlying taberite is the most likely explanation for these    differences in <i>δ</i><sup>13</sup>C<sub>DOC</sub> values. As thermokarst    lakes can be important greenhouse gas sources in the Arctic, it is    important to better understand the degree of degradation in the individual    talik layers as an indicator for their potential in greenhouse gas release,    especially, as predicted warming of the Arctic in the coming decades will    likely increase the number and extent (horizontal and vertical) of    thermokarst lake taliks.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Porewater <i>δ</i><sup>13</sup>C<sub>DOC</sub> indicates variable extent of degradation in different talik layers of coastal Alaskan thermokarst lakes","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2021,"MonPub":null,"DateUpdate":"2021-05-17","DateCreate":"2021-05-17","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000638137100001","VABBcode":null,"OpenAcc":1,"DOI":"10.5194/bg-18-2241-2021"},"refs":null,"anarec":{"AnaID":337214,"PubliDate":2021,"Pagination":"2241-2258","XtraPublOfAnaID":null,"ISBN":null,"Volume":"18","Issue":"7","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":68092,"SerRR":"<b>Gattuso, J.P.; Kesselmeier, J. (Ed.)</b> Biogeosciences. Copernicus Publications: Göttingen.  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