Validity of radiocarbon ages of Siberian yedoma

Vasil'chuk, Yurij K; Vasil'chuk, Alla Constantinovna

doi:10.1016/j.grj.2017.02.004

Cited by 30 publications

(13 citation statements)

References 58 publications

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“…So far, AMS radiocarbon dating of organic carbon of different size incorporated in wedge ices has provided most direct ages of such ice (eg,). Preferentially, plant macro‐remains such as roots, leaves or twigs have been used, but also lemming droppings .…”

Section: Research Topics—state Of the Art And Future Research Prioritiesmentioning

confidence: 99%

Ice wedges as archives of winter paleoclimate: A review

Opel

Meyer

Wetterich

et al. 2018

Permafrost & Periglacial

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Ice wedges are a characteristic feature of northern permafrost landscapes and grow mainly by snowmelt that refreezes in thermal contraction cracks that open in winter. In high latitudes the stable‐isotope composition of precipitation (δ18O and δD) is sensitive to air temperature. Hence, the integrated climate information of winter precipitation is transferred to individual ice veins and can be preserved over millennia, allowing ice wedges to be used to reconstruct past winter climate. Recent studies indicate a promising potential of ice‐wedge‐based paleoclimate reconstructions for more comprehensive reconstructions of Arctic past climate evolution. We briefly highlight the potential and review the current state of ice‐wedge paleoclimatology. Existing knowledge gaps and challenges are outlined and priorities for future ice‐wedge research are suggested. The major research topics are (1) frost cracking and infilling dynamics, (2) formation and preservation of the stable‐isotope information, (3) ice‐wedge dating, (4) age‐model development and (5) interpretation of stable‐isotope time series. Progress in each of these topics will help to exploit the paleoclimatic potential of ice wedges, particularly in view of their unique cold‐season information, which is not adequately covered by other terrestrial climate archives.

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Section: Research Topics—state Of the Art And Future Research Prioritiesmentioning

confidence: 99%

Ice wedges as archives of winter paleoclimate: A review

Opel

Meyer

Wetterich

et al. 2018

Permafrost & Periglacial

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“…По повторно-жильным льдам получены детальные изотопно-кислородная и дейтериевая диаграммы [5], позволившие судить о весьма суровых зимних условиях, существовавших в Верхоянском районе Центральной Якутии в позднем плейстоцене (можно даже говорить о самых холодных зимах в северном полушарии в позднем плейстоцене, т. е. полюс холода располагался там же, где и сейчас). Однако хронологическая привязка этих диа-грамм была выполнена на основе датирования вмещающих отложений, а вследствие того, что в едомных толщах обычно отмечается существенное переотложение органического материала, заметно удревняющего радиоуглеродные датировки [6], то и среди датировок, полученных по макровключениям органики из Батагайского разреза, встречен ряд инверсий радиоуглеродных дат [1,3,4]. Судя по датировкам, которые были получены Дж.…”

Section: географияunclassified

“…Судя по датировкам, которые были получены Дж. Мёртоном и К. Ашастиной с соавторами [1,3], авторы [5] предположили (считая наиболее молодые датировки с той же глубины более достоверными [6]), что верхние 20 м едомной толщи формировались примерно в период от 36 до 26-12 тыс. лет назад.…”

Section: географияunclassified

“…Во-первых, тем, что отбор производился не во фронтальном сечении жилы и, кроме того, вскрытие было таким, что в обнажении как единое ледяное тело было вскрыто и пересечение двух перпендикулярных жил. Во-вторых, наличие переотложенной органики естественно для мёрзлых толщ и повторно-жильных льдов [6]. В-третьих, глубина проникновения морозобойных трещин при формировании Батагайской едомы была экстремально большой (о чём косвенно свидетельствуют значительные вертикальные размеры едомы и жил, располагающихся в ней) и, видимо, изменялась от года к году, что приводило к разной глубине проникновения трещин и органического материала по ним.…”

Section: географияunclassified

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The first AMS radiocarbon dates of organic matter microinclusions in the ice wedge of the upper part of the Batagay yedoma megaslump, Yakutia

Vasil'chuk

Vasil’chuk

2019

Доклады Академии наук

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Microinclusions of organic matter were dated using acceleration mass spectrometry in seven samples from the upper part of the thick Pleistocene syngenetic ice wedges uncovered in the outcrop of the Batagay yedoma located in northern Yakutia along the upper Yana River (67,58 N, 134,77 E). The dated fragment of ice wedge was formed within 22 760-20 010 radiocarbon years BP (or 27 100-33 800 cal BP). Using detailed isotope data, the January average air temperature in the Late Pleistocene (25-30 cal kyr BP) was calculated for the Batagay section along with a series of reference sections in northwestern Yakutia. It was shown that the minimum January average air temperature (-51 C) was characteristic at that time for the area of the Batagaika crater, with values 4-5 higher in areas 500-600 km further north. This effect was caused by the occurrence of the Yakutian anticyclone in winter during the Late Pleistocene, which was just as pronounced as that at the present time.

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“…The large range of radiocarbon ages in these yedoma deposits suggests that they are mixed with ancient or younger organic material. According to Vasil'chuk and Vasil'chuk (2017), contamination with ancient organic material is 30…”

Section: Sediment Facies 20mentioning

confidence: 99%

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Jongejans¹

2018

Preprint

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As Arctic warming continues and permafrost thaws, more soil and sedimentary organic carbon (OC) will be decomposed in northern high latitudes. Still, uncertainties remain in the quantity and quality of OC stored in different deposit types of permafrost landscapes. This study presents OC data from deep permafrost and lake deposits on the Baldwin Peninsula which is located in the southern portion of the continuous permafrost zone in West-Alaska. Sediment samples 15 from yedoma and drained thermokarst lake basin (DTLB) deposits as well as thermokarst lake sediments were analyzed for cryostratigraphical and biogeochemical parameters and their lipid biomarker composition to identify the size and quality of belowground OC pools in ice-rich permafrost on Baldwin Peninsula. We provide the first detailed characterization of yedoma deposits on Baldwin Peninsula. We show that three quarters of soil organic carbon in the frozen deposits of the study region (total of 68 Mt) is stored in DTLB deposits (52 Mt) and one quarter in the frozen yedoma deposits (16 Mt). The 20 lake sediments contain a relatively small OC pool (4 Mt), but have the highest volumetric OC content (93 kg m -3 ) compared to the DTLB (35 kg m -3 ) and yedoma deposits (8 kg m -3 ), largely due to differences in the ground ice content. The biomarker analysis indicates that the OC in both yedoma and DTLB deposits is mainly of terrestrial origin. Nevertheless, the relatively high carbon preference index of plant leaf waxes in combination with a lack of degradation trend with depth in the yedoma deposits indicates that OC stored in yedoma is less degraded than that stored in DTLB deposits. This suggests that OC in 25 yedoma has a higher potential for decomposition upon thaw, despite the relatively small size of this pool. These findings highlight the importance of molecular OC analysis for determining the potential future greenhouse gas emissions from thawing permafrost, especially because this area close to the discontinuous permafrost boundary is projected to thaw substantially within the 21 st century.Biogeosciences Discuss., https://doi.

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Validity of radiocarbon ages of Siberian yedoma

Cited by 30 publications

References 58 publications

Ice wedges as archives of winter paleoclimate: A review

Ice wedges as archives of winter paleoclimate: A review

The first AMS radiocarbon dates of organic matter microinclusions in the ice wedge of the upper part of the Batagay yedoma megaslump, Yakutia

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