Short-term dynamics of a low-centred ice-wedge polygon near Chokurdakh (NE Yakutia, NE Siberia) and climate change during the last ca 1250 years

Short-term dynamics of a low-centred ice-wedge polygon near Chokurdakh (NE Yakutia, NE Siberia) and climate change during the last ca 1250 years
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乔库达赫(雅库特东北部、西伯利亚东北部)附近低中心冰楔多边形的短期动态和过去约 1250 年的气候变化

DOI:
10.1016/j.quascirev.2011.06.016
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发表时间:
2011
影响因子:
4
通讯作者:
Joosten H
Joosten H
中科院分区:
地球科学1区
文献类型:
--
作者:
de Klerk P;Donner N;Karpov NS;Minke M;Joosten H

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古生态学研究(包括花粉,宏化石,地球化学分析,AMS放射性碳测年)的四个泥炭段从一个低中心的冰楔多边形在东北雅库特(东北西伯利亚)允许多边形发展的三维重建在过去约1250年。湖泊排水后,泥炭形成的植被迅速入侵。与古温度数据的比较表明,成熟海脊的初始形成与公元1400年左右的夏季高温相吻合。在随后的约200年里,这些山脊持续存在并扩大。18世纪末,多个海脊部分崩塌,这与夏季气温较低的时期相对应。在温暖的世纪,一个崩溃的山脊再生,而另一个坚持在其崩溃的状态。因此,冰楔多边形是复杂和高度动态的生态系统,其中温度和降水的变化可能通过水、冰和植被的复杂相互作用引起迅速的生态变化。我们的研究表明,与夏季降水减少相关的全球变暖最初可能会导致多边形山脊的形成增强。然而,正如对高纬度地区所预测的那样,夏季较长和冬季降水增加的组合最终将导致多边形沼泽中的融水输入量增加,这可能导致多边形山脊和底层冰楔的(部分)崩溃。
Palaeoecological studies (including analysis of pollen, macrofossils, geochemistry, and AMS radiocarbon dates) of four peat sections from one low-centred ice-wedge polygon in NE Yakutia (NE Siberia) allow the three-dimensional reconstruction of polygon development during the last ca 1250 years. After drainage of a lake, peat forming vegetation invaded rapidly. Comparison with palaeotemperature data shows that the initial formation of mature ridges coincided with a period of high summer temperatures around AD 1400. The ridges persisted and expanded during the subsequent colder ca 200 years. Partial collapse of various ridges at the end of the 18th century corresponded to a phase with low summer temperatures. During the warm, 20th century one collapsed ridge regenerated, whereas another persisted in its collapsed state. Ice-wedge polygons are, thus, complex and highly dynamic ecosystems, in which changes in temperature and precipitation may induce rapid ecological changes by the complex interplay of water, ice and vegetation. Our study indicates that global warming associated with a decrease in summer precipitation may initially result in enhanced polygon ridge formation. The combination of longer summers and increased winter precipitation, as predicted for high latitudes will, however, eventually result in larger meltwater input in the polygon mires, which may cause the (partial) collapse of polygon ridges and underlying ice-wedges.
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