Diatom response to climatic and tectonic forcing of a palaeolake at the southeastern margin of the Tibetan Plateau during the late Pleistocene, between 140 and 35 ka BP
Diatom response to climatic and tectonic forcing of a palaeolake at the southeastern margin of the Tibetan Plateau during the late Pleistocene, between 140 and 35 ka BP
复制标题
青藏高原东南缘晚更新世（140~35ka BP）硅藻对气候和构造强迫的响应
DOI：
10.1016/j.palaeo.2015.06.039
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发表时间：
2015-10
期刊：
影响因子：
--
通讯作者：
Li Yanling, Rioual P., Shen J., Xiao X.Y
中科院分区：
文献类型：
--
作者：
Li Yanling, Rioual P., Shen J., Xiao X.Y
鹤庆盆地位于中国西南部的云南省，靠近青藏高原东南边缘，是一个受亚洲季风影响强烈的地区。其漫长的沉积记录代表了对古气候研究具有全球重要性的档案。本研究展示了使用 AMS14C 和磁地层学测年的最后 140-35ka 硅藻分析结果。硅藻通常在序列顶部（35 ka BP 之后）保存完好，其中硅藻太少而无法计数。硅藻数据提供了晚更新世古环境变化的详细历史，并证明了硅藻对气候和水文变化的敏感性。特别是，它们提供了水深的代理证据和温度变化的间接证据，其特征分别是浮游硅藻和底栖硅藻之间的冰期-间冰期变化以及温水和富营养物种 Aulacoseiragrinata 百分比的变化。值得注意的是，在鹤庆序列中，高比例的底栖硅藻与温暖和潮湿的条件一致，表明该地点的硅藻信号是由气候-流域-植被过程介导的，例如养分浓度和流域径流。然而，从大约 132ka BP 开始，盆地的构造隆起引起了湖泊水文环境的变化。然后，花粉和地球化学数据被用来帮助解释硅藻序列，并将气候的直接影响与流域条件（例如冰川融水的影响）所介导的影响区分开来。
The Heqing Basin is located in Yunnan Province, south-western China, near the southeastern edge of the Tibetan Plateau, a region that is strongly influenced by the Asian monsoon. Its long sedimentary record represents an archive of global importance for palaeoclimate research. This study presents the results of diatom analysis of the last 140–35 ka of the record, dated using AMS14C and magnetostratigraphy. Diatoms are generally well preserved apart at the top of the sequence (after 35 ka BP) in which diatoms were too few to be counted. The diatom data provide a detailed history of palaeoenvironmental changes during the late Pleistocene and demonstrate the sensitivity of diatoms to changes in climate and hydrology. In particular, they provide proxy evidence for water depth and indirect evidence for temperature changes that are characterized by glacial-interglacial shifts between planktonic and benthic diatoms and variations in the percentage of the warm-water and eutrophic speciesAulacoseiragranulata, respectively. In the Heqing sequence, remarkably, high proportions of benthic diatoms coincide with warm and wet conditions suggesting that at this site the diatom signal is mediated by climate-catchment-vegetation processes, such as the concentration of nutrient and runoff from the catchment. From ~ 132 ka BP however, the tectonic uplift of the basin caused a change in the hydrological setting of the lake. Pollen and geochemical data are then used to help interpreting the diatom sequence and disentangle the direct effects of climate from those mediated by the conditions on the catchment such as the influence of glacier melt-water.
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影响因子：
2.7
作者：
H. V. Leland;L. Brown;D. K. Mueller
通讯作者：
H. V. Leland;L. Brown;D. K. Mueller
DOI：
--
发表时间：
1991
期刊：
--
影响因子：
--
作者：
K. Krammer;H. Lange-Bertalot;A. Pascher;H. Ettl
通讯作者：
K. Krammer;H. Lange-Bertalot;A. Pascher;H. Ettl
结合磁性地层学、放射性碳测年和碳酸盐循环性的年龄微调：鹤庆盆地（中国云南）覆盖过去 1 Myr 的湖泊沉积物示例
影响因子：
3
作者：
Shouyun Hu
通讯作者：
Shouyun Hu
DOI：
10.1017/cbo9780511763175.013
发表时间：
2010
期刊：
--
影响因子：
--
作者：
A. Lotter;R. Pienitz;R. Schmidt
通讯作者：
A. Lotter;R. Pienitz;R. Schmidt
影响因子：
4.5
作者：
D. Ryves;R. Battarbee;S. Juggins;S. Fritz;N. Anderson
通讯作者：
D. Ryves;R. Battarbee;S. Juggins;S. Fritz;N. Anderson