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PAST GLOBAL CLIMATE CHANGE: A HIGH RESOLUTION EVIDENCE FROM SW SIBERIA

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Аннотация

The southern Siberian loess, being a continuation of the Eurasian loess-belt, has provided one of
the most complete terrestrial proxy records on the global past climate development. New high-resolution
loess-paleosol sections from the Priobie Loess Plateau (Iskitim) and the Altay Plains (Biysk, Bystrianka
and Krasnogorskoe), SW Siberia, recently studied as a part of the 2000 km W-E Siberian paleoclimatic
transect, provide new detailed information on the Late Pleistocene climate evolution and landscape
development in the parkland-steppe zone of southern Siberia. The complete stratigraphic records
documented by magnetic susceptibility, grain-size, % CaCO3 and % organic carbon as proxy climatic
data, and supplemented by thin-section studies, show cyclic climatic variations within the last interglacialglacial
cycle. A strongly continental warm climate culminated around the peak of the last interglacial
(sensu stricto OIS 5e) and cooler conditions occurred during the following interstadial stages (OIS 5c
and 5a), corresponding to shifts in palaeolandscape development with gradual replacement of parklandsteppe
and mixed southern taiga by boreal forest, transformed into a cold arid periglacial tundra-steppe
during the stadial stages (OIS 5d and 5b). A similar trend with short warm and very cold intervals can
be observed in the mid-last glacial interglacial interval (OIS 3) in accordance with the evidence from
other Siberian key high-resolution loess sections from the Yenisei and Angara region, separated by the
early and late last glacial loess beds (OIS 4 and 2, respectively). The pedosedimentary record, reflecting
the effects of syndepositional pedogenic processes, attests to a dynamic global climate pulsation during
the Late Quaternary in north-central Asia.

Ключевые слова


551.311.324.3+551.585(571.1+571.5)

Об авторе

J. Chlachula
Laboratory of Palaeoecology, University of Zlin
Россия


Список литературы

1. Chlachula J. The Siberian loess record and its significance for reconstruction of the Pleistocene climate change in north-central Asia // Dust Indicators and Records of Terrestrial and Marine Palaeoenvironments (DIRTMAP). Quaternary Sci. Rev. 2003. № 22 (18-19). Р. 1879-1906.

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Для цитирования:


Chlachula J. PAST GLOBAL CLIMATE CHANGE: A HIGH RESOLUTION EVIDENCE FROM SW SIBERIA . Литосфера. 2005;(3):148-153.

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ISSN 1681-9004 (Print)
ISSN 2500-302X (Online)