Peat biostratigraphy and Holocene climate in the northwestern mountain periphery of Lake Baikal

被引：15

作者：

Bezrukova, E. V. ^{[1
,2
]}

Belov, A. V. ^{[3
]}

Letunova, P. P. ^{[1
,2
]}

Abzaeva, A. A. ^{[1
,2
]}

Kulagina, N. V. ^{[4
]}

Fisher, E. E. ^{[3
]}

Orlova, L. A. ^{[5
]}

Sheifer, E. V. ^{[6
]}

Voronin, V. I. ^{[6
]}

机构：

[1] RAS, Siberian Branch, Inst Archaeol & Ethnog, Novosibirsk 630090, Russia

[2] RAS, Siberian Branch, Inst Geochem, Irkutsk 664033, Russia

[3] RAS, Siberian Branch, Inst Geog, Irkutsk 664033, Russia

[4] RAS, Siberian Branch, Inst Earths Crust, Irkutsk 664033, Russia

[5] RAS, Siberain Branch, Inst Geol & Mineral, Novosibirsk 630090, Russia

[6] RAS, Siberian Branch, Siberian Inst Plants Physiol & Biochem, Irkutsk 664033, Russia

来源：

RUSSIAN GEOLOGY AND GEOPHYSICS | 2008年 / 49卷 / 06期

基金：

俄罗斯基础研究基金会;

关键词：

mountain ecosystems; biostratigraphy; dated paleoenvironmental records; Holocene; regional paleoclimate correlations;

D O I：

10.1016/j.rgg.2007.11.010

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We report new radiocarbon ages, pollen stratigraphy, and botanical composition of an organic sediment sequence from mountains along the northwestern side of Lake Baikal. The calendar age of the peat is ca. 9.5 kyr BP. The pollen spectra between 9.5 and 8.5 kyr ago show vegetation consisting mostly of open larch and spruce-larch forests with minor birch. The interval from 7.5 to 6.8 kyr BP is marked by broad fir spread confirmed also by the peat botanical composition. The climate inferred for the period of fir dominance combines mild winters, cool summers, thick snow cover, and abundant moisture, apparently due to more intense North Atlantic air transport. Fir percentages decrease dramatically after 6.8 kyr BP, when pines begin to spread in the Baikal watershed. The peat record bears imprint of North Atlantic cooling events identified as intervals of ice-rafted detritus deposition and low surface water temperatures. The new data allow a better insight into the regional climate and landscapes, and the reliable age model provides regional and inter-regional correlations of global change events. (C) 2008, IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.

引用

页码：413 / 421

页数：9

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