Weichselian and Holocene palaeoenvironmental history of the Bol'shoy Lyakhovsky Island, New Siberian Archipelago, Arctic Siberia
Weichselian and Holocene palaeoenvironmental history of the Bol'shoy Lyakhovsky Island, New Siberian Archipelago, Arctic Siberia
复制标题
北极西伯利亚新西伯利亚群岛 Bol'shoy Lyakhovsky 岛 Weichselian 和全新世古环境史
DOI：
10.1111/j.1502-3885.2008.00039.x
复制
发表时间：
2009-01-01
期刊：
影响因子：
2.2
通讯作者：
Kunitsky, Viktor V.
中科院分区：
文献类型：
--
作者：
Andreev, Andrei A.;Grosse, Guido;Kunitsky, Viktor V.
Andreev，A.一、格罗斯湾，Schlemmeister湖，Kuznetsova，T.五、Kuzmina，S.一、Bobrov，A.一、塔拉索夫，P.E.，Novenko，E.是的，Meyer，H.，Derevyagin，A.是的，Kienast，F.，Bryantseva，A. & Kunitsky，V. V.：北极西伯利亚新西伯利亚群岛Bol'shoy Lyakhovsky岛的Weichselian和全新世古环境史。Boreas，10.1111/j.1502-3885.2008.00039.x。来自Bol'shoy Lyakhovsky Island永久冻土序列（73 ° 20' N，141 ° 30 'E）的低温岩性、地面冰和化石生物指示物（花粉、硅藻、植物宏体化石、根足类、昆虫、哺乳动物骨骼）记录记录了该地区过去c. 11.5万植被类似于现代亚北极苔原社区盛行Eemian/早期Weichselian过渡的气候比现在温暖。稀疏的苔原样植被和恶劣的气候条件下占主导地位的早期Weichselian。Weichselian中期沉积物包含泥炭和泥炭土壤层，生物指示物记录了气候改善。虽然矮柳树生长在更受保护的地方，苔原和草原植被占主导地位。气候条件变得更冷和干燥C。距今30万年。没有沉积物之间的C。28.5 12.05C-14 kyr BP，可能反映了该时期的侵蚀活动。11.6-11.3 C-14 kyr BP，草本和灌木植被占主导地位。夏季气温为C。比今天高4摄氏度。典型的北极环境在10.5 C-14 kyr BP左右盛行。灌丛桤木和矮桦冻原是C. 9和7.6 kyr BP。重建后的夏季气温比现在高出至少4摄氏度。然而，昆虫遗骸反映了类似草原的栖息地一直存在到公元前。8kyr BP. 7.6 kyr BP后，灌木逐渐消失，植被覆盖变得类似于现代苔原。花粉和甲虫表明了一个严酷的北极环境。3.7 Kyr BP。然而，今天不在岛上的矮桦仍然存在。连同我们以前的研究，博勒绍伊Lyakhovsky岛涵盖了约200和115 kyr之间的时期，一个全面的陆地古环境数据集，从这个地区在西部白令海，现在可用于过去的两个冰川间冰期循环。
Andreev, A. A., Grosse, G., Schirrmeister, L., Kuznetsova, T. V., Kuzmina, S. A., Bobrov, A. A., Tarasov, P. E., Novenko, E. Y., Meyer, H., Derevyagin, A. Y., Kienast, F., Bryantseva, A. & Kunitsky, V. V.: Weichselian and Holocene palaeoenvironmental history of the Bol'shoy Lyakhovsky Island, New Siberian Archipelago, Arctic Siberia. Boreas, 10.1111/j.1502-3885.2008.00039.x. ISSN 0300-9483.Cryolithological, ground ice and fossil bioindicator (pollen, diatoms, plant macrofossils, rhizopods, insects, mammal bones) records from Bol'shoy Lyakhovsky Island permafrost sequences (73 degrees 20'N, 141 degrees 30'E) document the environmental history in the region for the past c. 115 kyr. Vegetation similar to modern subarctic tundra communities prevailed during the Eemian/Early Weichselian transition with a climate warmer than the present. Sparse tundra-like vegetation and harsher climate conditions were predominant during the Early Weichselian. The Middle Weichselian deposits contain peat and peaty soil horizons with bioindicators documenting climate amelioration. Although dwarf willows grew in more protected places, tundra and steppe vegetation prevailed. Climate conditions became colder and drier c. 30 kyr BP. No sediments dated between c. 28.5 and 12.05 C-14 kyr BP were found, which may reflect active erosion during that time. Herb and shrubby vegetation were predominant 11.6-11.3 C-14 kyr BP. Summer temperatures were c. 4 degrees C higher than today. Typical arctic environments prevailed around 10.5 C-14 kyr BP. Shrub alder and dwarf birch tundra were predominant between c. 9 and 7.6 kyr BP. Reconstructed summer temperatures were at least 4 degrees C higher than present. However, insect remains reflect that steppe-like habitats existed until c. 8 kyr BP. After 7.6 kyr BP, shrubs gradually disappeared and the vegetation cover became similar to that of modern tundra. Pollen and beetles indicate a severe arctic environment c. 3.7 kyr BP. However, Betula nana, absent on the island today, was still present. Together with our previous study on Bol'shoy Lyakhovsky Island covering the period between about 200 and 115 kyr, a comprehensive terrestrial palaeoenvironmental data set from this area in western Beringia is now available for the past two glacial-interglacial cycles.