Paleo-sea ice distribution and polynya variability on the Kara sea shelf during the last 12 ka.

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dc.contributor.author Hörner, Tanja
dc.contributor.author Stein, Ruediger
dc.contributor.author Fahl, Kirsten
dc.coverage.spatial MEDIAN LATITUDE: 74.597149 * MEDIAN LONGITUDE: 80.437498 * SOUTH-BOUND LATITUDE: 73.414830 * WEST-BOUND LONGITUDE: 79.674660 * NORTH-BOUND LATITUDE: 76.961783 * EAST-BOUND LONGITUDE: 81.963167 * DATE/TIME START: 1999-08-26T00:00:00 * DATE/TIME END: 2000-09-19T03:35:00
dc.date.accessioned 2019-11-24T06:23:34Z
dc.date.available 2019-11-24T06:23:34Z
dc.date.issued 2018-03-19
dc.identifier https://doi.pangaea.de/10.1594/PANGAEA.887426
dc.identifier https://doi.org/10.1594/PANGAEA.887426
dc.identifier.citation Hörner, Tanja; Stein, Ruediger; Fahl, Kirsten (2018): Paleo-sea ice distribution and polynya variability on the Kara sea shelf during the last 12 ka. arktos - The Journal of Arctic Geosciences, https://doi.org/10.1007/s41063-018-0040-4
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/7549
dc.description.abstract The Kara Sea is an important area for paleo-climatic research since sea ice and brine formation take place on its shelf-two processes inducing supra-regional climatic implications and thereby connecting regional environmental variability with global climatic conditions. To gain information about past sea ice coverage and variations, three sediment cores distributed in the southern and central parts of the marginal Sea were investigated. By applying the sea ice biomarker IP25 and the PIP25 index [phytoplankton biomarker (dinosterol)-IP25 index] post-glacial sea ice variability could be detected in the central Kara Sea (Core BP00-36/4), with most intense sea ice cover between 12.4 and 11.8 ka coinciding with the Younger Dryas (12.9-11.6 ka), and reduced sea ice cover between 10 and 8 ka during the Holocene Thermal Maximum. During the last ~7 ka, increasing sea ice indicators might indicate a Holocene cooling trend, probably induced by declining summer insolation. Furthermore, temporal changes in the fast ice?polynya distribution in the southern Kara Sea were detected: expanding fast ice during the late Holocene and a cyclic short-term Holocene climate variability documented by abrupt changes in the sea ice coverage at the BP00-07/7 core site. Core BP99-04/7 from the Yenisei estuary recorded consistently seasonal sea ice cover since ~9.3 ka, apart from five short phases of fast ice expansion to the core site. The strong influence of river run-off as well as estuary processes might prevent the detection of (short-term) climatic signals at this study site.
dc.format application/zip, 3 datasets
dc.language.iso en
dc.publisher PANGAEA
dc.rights CC-BY-3.0: Creative Commons Attribution 3.0 Unported
dc.rights Access constraints: unrestricted
dc.source Supplement to: Hörner, Tanja; Stein, Ruediger; Fahl, Kirsten (2018): Paleo-sea ice distribution and polynya variability on the Kara sea shelf during the last 12 ka. arktos - The Journal of Arctic Geosciences, https://doi.org/10.1007/s41063-018-0040-4
dc.subject AWI_Paleo
dc.subject Paleoenvironmental Reconstructions from Marine Sediments @ AWI
dc.title Paleo-sea ice distribution and polynya variability on the Kara sea shelf during the last 12 ka.
dc.title.alternative Biomarker content and total organic carbon of sediment cores from the Kara Sea shelf
dc.type Dataset


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