首页>>文献首页>>文献正文

The Réunion Subchron vegetation and climate history of the northeastern Russian Arctic inferred from the Lake El'gygytgyn pollen record

zhaochen17 添加于 2017/4/5 16:41:03  282次阅读 | 0次推荐 | 79个评论

The 318-m-thick sediment record from Lake El'gygytgyn provides unique opportunities for a detailed examination of environmental changes during the Réunion Subchron polarity reversal event (2.1384–2.1216 Myr BP) in the northeastern Russian Arctic. The paper describes vegetation and climate fluctuations between ~ 2.15 and 2.10 Myr BP as inferred from palynological data. Biome reconstructions indicate that throughout this interval the tundra (TUND) biome generally has higher affinity scores as compared to cold steppe (STEP) or cold deciduous forest (CLDE). An exception is the climatic optimum between ~ 2.139 and 2.131 Myr BP, coinciding with Marine Isotope Stage 81 (approximately the Réunion Subchron), when the CLDE biome has the highest scores. Landscape-openness indices suggest that more closed vegetation characterized most of the interval between 2.146 and 2.127 Myr BP, when deciduous forest and shrubs expanded in the regional vegetation and climate was relatively warm and wet. Peaks in green algal colonies (Botryococcus) and Zygnema-type spores ~ 2.150–2.146, ~ 2.131–2.123, and ~ 2.112–2.102 Myr BP indicate expansions of shallow-water habitats and lowered lake levels. Comparisons with biome reconstructions from other interglacial intervals at Lake El'gygytgyn suggest that precession-related summer insolation intensity and obliquity-related duration of summer daylight are major controls on the onset of interglaciations, whereas obliquity probably plays a more significant role on vegetation succession at northern high latitudes during the Pleistocene.

作 者:W.W. Zhao, A.A. Andreeva, V. Wennricha, P.E. Tarasovc, P. Andersond, A.V. Lozhkine, M. Mellesa
期刊名称: Palaeogeography, Palaeoclimatology, Palaeoecology
期卷页: 2015 第436卷 第15期 167-177页
学科领域:地球科学 » 地理学 » 自然地理学
添加人是否为作者:
原文链接:http://www.sciencedirect.com/science/article/pii/S0031018215003600
DOI:
ISBN:
关键词: Pollen; Early Pleistocene; Biome; Orbital forcing; Northeastern Russian Arctic
全文地址: 下载
备 注:
文献笔记

 
导出选项:

评论 (79 个评论)

发表评论人: [2017/4/16 3:49:51] 
test
发表评论人: [2017/4/16 3:49:51] 
test
发表评论人: [2017/4/16 3:49:50] 
test
发表评论人: [2017/4/16 3:49:50] 
test
发表评论人: [2017/4/16 3:49:50] 
test
发表评论人: [2017/4/16 3:49:49] 
test
发表评论人: [2017/4/16 3:49:48] 
test' and '1%'='11
发表评论人: [2017/4/16 3:49:48] 
test' and '11%'='11
发表评论人: [2017/4/16 3:49:47] 
test' and '%'='
发表评论人: [2017/4/16 3:49:47] 
test' and '1'='11
Page 1 of 8
发表评论:
验证码  
 

举报 | Archiver | 科学网( 京ICP备07017567 )

GMT+8, 2011-2-15 11:31

Powered by ScienceNet.cn

Copyright © 2007-2011 科学时报社