Holocene evolution of a proglacial lake in southern Kamchatka, Russian Far East
Holocene evolution of a proglacial lake in southern Kamchatka, Russian Far East
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俄罗斯远东堪察加半岛南部前冰川湖的全新世演化
作者：
Nazarova L
堪察加半岛（俄罗斯远东地区）仍然是东亚研究最少的地区之一。最近的研究表明，半岛不同地区之间的古环境差异很大。我们研究了从Sokoch湖（堪察加南部）采集的沉积物岩心中提取的半水生（chironomids）和陆生（叶蜡生物标志物）代用物，以重建七月平均气温和湖泊条件的变化。该湖形成于10.0 cal. ka BP之后，是冰期后变暖的结果，由邻近冰川的冰川融水补给。我们的数据表明，相对于堪察加半岛、西伯利亚和楚科奇半岛更北部的地区，全新世热极大值（HTM）的开始时间更晚，并支持气候模式实验的结论，即堪察加半岛南部和中部的热极大值比阿拉斯加和西伯利亚东北部晚了约2000年。10.0 ~ 6.4 cal. ka BP为温暖气候，8.2 cal. ka BP左右为短暂的凉爽和干燥气候，这可能与8.2 ka变冷事件有关。热热期发生在6.5 ~ 3.4 cal. ka BP之间，最暖期在6.0 ~ 5.0 cal. ka BP之间。3.4 cal. ka BP新冰期降温的开始与西伯利亚高压和阿留申低压的增强相一致。1.2 ~ 0.9 cal. ka BP的变暖可归因于中世纪气候异常。LIA降温与西伯利亚高压和阿留申低压的另一次加强有关。现代的变暖，虽然在我们的记录中很少被发现，但与最近的气象观测是一致的。本文的古环境记录证实了堪察加半岛全新世主要气候波动的时间和幅度的空间差异，有助于理解堪察加半岛全新世气候变化的表现。
The Kamchatka Peninsula (Russian Far East) remains among the least studied regions of eastern Asia. Recent studies revealed a high degree of palaeoenvironmental variability between different parts of the peninsula. We investigated semi‐aquatic (chironomids) and terrestrial (leaf wax biomarkers) proxies from a sediment core collected from Lake Sokoch (southern Kamchatka) to provide reconstruction of the mean July air temperature and variations in limnic conditions. The lake formed after 10.0 cal. ka BP as a result of postglacial warming and was fed by glacial meltwaters from neighbouring glaciers. Our data show a later beginning of the Holocene thermal maximum (HTM) relative to more northern sites in Kamchatka, Siberia and Chukotka and support climate model experiments that suggest that the HTM was delayed in southern and central Kamchatka by about 2000 years compared with Alaska and NE Siberia. Warm conditions prevailed between 10.0 and 6.4 cal. ka BP with a short spell of cool and dry climate around 8.2 cal. ka BP that might be related to the 8.2 ka cooling event. The HTM took place between 6.5 and 3.4 cal. ka BP with the warmest phase from 6.0 to 5.0 cal. ka BP. An onset of Neoglacial cooling at 3.4 cal. ka BP is consistent with the strengthening of both the Siberian High and the Aleutian Low. Warming between 1.2 and 0.9 cal. ka BP can be attributed to the Mediaeval Climate Anomaly. The LIA cooling is related to another strengthening of the Siberian High and the Aleutian Low. The modern warming, though weakly traced in our record, is consistent with the recent meteorological observations. The presented palaeoenvironment record confirms the earlier findings of spatial differences within Kamchatka in timing and magnitude of the major Holocene climate fluctuations and contributes towards understanding the expression of Holocene climate change in Kamchatka.
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DOI：
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DOI：
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发表时间：
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