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Swann, George E A; Mackay, Anson W; Leng, Melanie J; Demory, François (2005): MIS 3 diatom assemblage and bulk organic carbon isotope data from Lake Baikal sediment core CON01-603-5 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.856102, Supplement to: Swann, GEA et al. (2005): Climatic change in Central Asia during MIS 3/2: a case study using biological responses from Lake Baikal. Global and Planetary Change, 46(1-4), 235-253, https://doi.org/10.1016/j.gloplacha.2004.09.019

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Abstract:
A Marine Isotope Stage (MIS) 3/early MIS 2 section from a structural high along the east coast of the North Basin of Lake Baikal was analysed for diatoms, C/N ratios, and organic carbon isotope ratios. Diatoms were present throughout MIS 3 and early MIS 2, with high concentrations of the planktonic taxa Cyclotella sp. c.f. gracilis between 54 and 51.5 kyr BP indicating relatively warm, interstadial, conditions. Following a %TOC inferred climatic cooling between 43.2 and 39.1 kyr BP, evidence of a more muted d13C(organic) and %TOC inferred climatic warming from c. 39.1-34.7 kyr BP coincides with a period of very high diatom concentrations, indicating high aquatic productivity, at the Buguldeika Saddle in the South Basin of Lake Baikal. No evidence exists for a 'Kuzmin' catchment erosional event in the North Basin during MIS 3. This, however, may reflect the location of the coring site away from major riverine inputs. Abrupt climatic cooling at the culmination of both warm phases in the North Basin are associated, on the basis of the palaeomagnetic age-model and correlations to existing sites in Lake Baikal, with the initiation of Heinrich events 5 (c. 50 kyr BP) and 4 (c. 35 kyr BP), respectively, in the North Atlantic. The amount of organic material declines across the MIS 3/MIS 2 transition while constant C/N ratios suggest organic material to be predominantly derived from phytoplankton. An increase in d13C(organic) at the MIS 3/MIS 2 transition may therefore indicate changes in aquatic productivity, pCO2 or the inorganic carbon pool.
Project(s):
High-resolution Continental Paleoclimate Record in Lake Baikal (CONTINENT)
Coverage:
Latitude: 53.954600 * Longitude: 108.913700
Date/Time Start: 2001-07-29T05:20:00 * Date/Time End: 2001-07-29T05:20:00
Event(s):
CON01-603-5 * Latitude: 53.954600 * Longitude: 108.913700 * Date/Time: 2001-07-29T05:20:00 * Elevation: 465.0 m * Lake water depth: 386 m * Penetration: 0.39 m * Location: Lake Baikal, Russia * Campaign: CON01-6 * Basis: Vereshchagin * Method/Device: Kasten corer (KAL)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Swann, GEA; Mackay, AW; Leng, MJ et al. (2005): Diatom concentration in Lake Baikal sediment core CON01-603-5. https://doi.org/10.1594/PANGAEA.856100
  2. Swann, GEA; Mackay, AW; Leng, MJ et al. (2005): Relative abundances of diatoms in Lake Baikal sediment core CON01-603-5. https://doi.org/10.1594/PANGAEA.856101
  3. Swann, GEA; Mackay, AW; Leng, MJ et al. (2005): Bulk organic carbon content and isotopic record from Lake Baikal sediment core CON01-603-5. https://doi.org/10.1594/PANGAEA.856099