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Uncertainty in temperature and sea level datasets for the Pleistocene glacial cycles: Implications for thermal state of the subsea sediments

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dc.contributor.author Malakhova V.V.
dc.contributor.author Eliseev A.V.
dc.date.accessioned 2021-02-25T20:35:31Z
dc.date.available 2021-02-25T20:35:31Z
dc.date.issued 2020
dc.identifier.issn 0921-8181
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/161910
dc.description.abstract © 2020 Elsevier B.V. Temperature and sea level changes in the Pleistocene are uncertain. This leads to uncertainty in the associated response of the thermal state of the subsea sediments. We quantified the upper bound of the latter uncertainty in idealised simulations with a model for thermophysical processes in the sediments. At the coast and at the shallow and intermediate–depth shelves and except during relatively isolated time intervals, this bound for permafrost base depth and for the methane hydrate stability zone (MHSZ) characteristics (depth of its bottom boundary and its thickness) is ≤45% provided that the geothermal heat flux (GHF) is not larger than 80 mW m−2. These values are much smaller than the uncertainty metrics for the forcing data, which are typically ≥65%. However, for the intermediate shelf with a larger geothermal heat flux and for the deep shelf irrespective of GHF, different forcing time series may even lead to qualitatively different behaviour of the sediment thermophysical characteristics. We found that prescription of sea level changes plays a crucial role in uncertainty of the simulated subsea permafrost and MHSZ in the deep shelf sediments. In addition, we also quantified uncertainty for estimated apparent response time scales. The relative uncertainty for permafrost base depth and hydrate stability zone thickness time scales is ≤20% for most cases. We found no systematic dependence of our results on accounting for millennium–scale temperature variability provided that timescales of the order of 104 yr are resolved by forcing datasets.
dc.relation.ispartofseries Global and Planetary Change
dc.subject Glacial cycles
dc.subject Paleoreconstructions
dc.subject Response timescales
dc.subject Subsea methane hydrates
dc.subject Subsea permafrost
dc.title Uncertainty in temperature and sea level datasets for the Pleistocene glacial cycles: Implications for thermal state of the subsea sediments
dc.type Article
dc.relation.ispartofseries-volume 192
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS09218181-2020-192-SID85086742709

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  • Публикации сотрудников КФУ Scopus [22633]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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