Abstract

The first results of palynological analysis of the bottom deposits of Kaskadnoe Lake and a reconstruction of vegetation and climate on the Oka Plateau over the last 14.2 ky are reported. It is shown that approximately 1.2–12.9 cal ka BP (GI-1) the regional climate was sufficiently warm and humid to allow the development of a forb–shrub tundra with spruce and larch stands. Cooling at approximately 12.9–11.5 cal ka BP (GS-1) led to the predominance of the forb–shrub tundra in the lake basin. Siberian pine settled on the Oka Plateau in a moderate–cold and humid climate at approximately 11.5–9.0 cal ka BP. The warmer and drier climate, which prevailed in the Middle Holocene approximately 9.0–4.5 cal ka BP, resulted in the retreat of dark-coniferous forests from the Kaskadnoe Lake basin. The spreading of larch and Siberian pine coincided with the onset of Neoglacial conditions in the Late Holocene. It was established that the environmental conditions on the Oka Plateau in the Late Glacial Period and Holocene were generally controlled by the interaction of the western atmospheric transport and the East Asian summer monsoon, the temperature variations caused by the insolation level, and the specific features of regional atmospheric circulation.

中文翻译：

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奥卡高原的冰川后植被和气候史（南西伯利亚东萨彦岭）

摘要

据报道，对卡斯卡德诺湖底部沉积物进行了孢粉学分析，并在最后一个14.2 ky上重建了冈山高原的植被和气候，取得了初步结果。结果表明，大约1.2–12.9 cal ka BP（GI-1）的区域气候足够温暖和潮湿，足以形成具有云杉和落叶松林分的前灌木灌木冻原。大约在12.9–11.5 cal ka BP（GS-1）处冷却，导致湖盆中的前灌木灌木冻原占主导地位。西伯利亚松树在约11.5–9.0 cal ka BP的中度寒冷湿润气候下定居在Oka高原上。在中新世大约9.0–4.5 cal ka BP盛行的较温暖和干燥的气候导致Kaskadnoe湖盆地的暗针叶林退缩。落叶松和西伯利亚松的传播与全新世晚期新冰期的发生相吻合。可以确定的是，冰川期末和全新世的奥卡高原的环境条件通常是由西方大气传输和东亚夏季风的相互作用，日照水平引起的温度变化以及赤道高原的特殊特征所控制的。区域大气环流。