Late Holocene environmental change in arctic western Siberia
Late Holocene environmental change in arctic western Siberia
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DOI：
10.1177/0959683614556387
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发表时间：
2015-01
期刊：
影响因子：
--
通讯作者：
A. Self;V. Jones;S. Brooks
中科院分区：
文献类型：
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作者：
A. Self;V. Jones;S. Brooks
西伯利亚西部的普托拉纳高原位于大西洋和西伯利亚大陆气候区的边界，对大气环流的变化很敏感。三个湖泊的海拔样带进行了研究，摇蚊亚化石提供晚全新世气候在这个偏远的，研究不足的俄罗斯北极地区的第一次估计。从三个位置接近的湖泊沉积物岩心的分析是罕见的古环境研究，使其他环境变量的作用，这可能是一个潜在的错误来源，在古气候重建，进行评估。基于摇蚊的重建表明了一个更海洋性的气候。3400 cal. BP with July temperatures c. 1.5°C比现在温暖，迅速冷却。2°C，在3200和2600 cal. BP之间具有更多的大陆性气候。这些趋势在时间和规模上与其他北方的记录相似。最近的摇蚊记录显示，在过去的50年里，明显的动物群的变化，可能直接或间接，因为气候驱动的流域水文变化。这是特别明显的，在最近的记录，从一个开放的湖泊内的一个大型湿地栖息地，这似乎相对不敏感的变化，7月的空气温度。
The Putorana Plateau, western Siberia, situated on the boundary of the Atlantic and continental Siberian climate provinces, is sensitive to shifts in atmospheric circulation. Three lakes on an altitudinal transect were studied using chironomid subfossils to provide the first estimates of late Holocene climate in this remote, poorly studied region of Arctic Russia. The analysis of sediment cores from three closely located lakes is rare in palaeoenvironmental studies and enables the role of other environmental variables, which may be a potential source of error in palaeoclimatic reconstructions, to be assessed. The chironomid-based reconstructions suggest a more maritime climate c. 3400 cal. BP with July temperatures c. 1.5°C warmer than present which cooled rapidly by c. 2°C, with a more continental climate between 3200 and 2600 cal. BP. These trends are similar in timing and scale to other northern hemisphere records. The recent chironomid records from all three lakes show pronounced faunal changes over the last 50 years probably directly or indirectly because of climate-driven changes in catchment hydrology. This is particularly evident in the recent record from an open lake within a large wetland habitat, which appears relatively insensitive to changes in July air temperatures.