Organic matter geochemical signatures of sediments of Lake Ngoring (Qinghai-Tibetan Plateau): A record of environmental and climatic changes in the source area of the Yellow River for the last 1500 years
Organic matter geochemical signatures of sediments of Lake Ngoring (Qinghai-Tibetan Plateau): A record of environmental and climatic changes in the source area of the Yellow River for the last 1500 years
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青藏高原鄂林湖沉积物有机质地球化学特征：黄河源区近1500年环境气候变化记录
DOI：
10.1016/j.palaeo.2020.109729
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发表时间：
2020-08
影响因子：
3
通讯作者：
Zhang Hucai
中科院分区：
文献类型：
--
作者：
Pu Yang;Werne Josef P.;Meyers Philip A.;Zhang Hucai
黄河源区（SAYR）的气候历史对于了解青藏高原东北部气候演化的节奏和过程具有重要意义。迄今为止，该高山地区的研究成果有限。在此，我们提供了青藏高原最大淡水湖的第一个湖泊记录，记录了过去 1500 年 SAYR 的气候和环境变化。大量有机碳和氮同位素组成（δ C-13（org）和δ N-15（tot））与原子碳/氮（C/N）比相结合，表明恩戈林湖的沉积有机质源自原生藻类，陆地输入量较小。将青藏高原北部敦德冰川和古里雅冰川的有机碳同位素值记录与已发表的冰积累率（IAR）记录、太阳总辐照度（TSI）、格陵兰冰芯δ O-18变化以及青海湖生物敏感指标（C-37：4烯酮、crenarchaeol和bGDGT浓度）的记录进行比较表明： 恩戈林湖沉积物中 Delta C-13(org) 值的变化反映了与 SAYR 降水量和冰川融水量变化相关的湖水位波动。 Delta C-13(org) 值的正移表明高湖水位阶段对应于北大西洋涛动指数 (NAOI) 的较高值和南方涛动指数 (SOIpr) 的较低值。这种关系表明，SAYR 的水文历史与印度季风和西风带的变化有关，并且在高 TSI 阶段，两个气团向 SAYR 输送了更多的水分。相比之下，三角洲 N-15(tot) 值的变化类似于从冰芯、泥炭序列、湖泊沉积物和其他 QTP 站点的综合古记录中获得的多个古气候代理记录，这表明恩戈林湖沉积物中存档的三角洲 N-15(tot) 值提供了过去湖水温度变化的历史，该历史与温度相关的变化历史一致。 来自区域古气候研究的参数。在三角洲N-15(tot)变化中可以清楚地观察到20世纪的黑暗时代寒冷期、中世纪气候异常、小冰期和现代变暖等全球气候事件。一般来说，恩戈林湖沉积物中的 Delta C-13(org) 和 Delta N-15(tot) 值似乎是重建高山贫营养淡水湖（如本湖）古环境和古气候的有用指标。
The climate history of the source area of the Yellow River (SAYR) is important to understanding the pacing and processes of climate evolution on the northeastern Qinghai-Tibetan Plateau (QTP). To date, results of research in this alpine region are limited. Herein, we provide a first lacustrine record from the largest freshwater lake on the QTP that archives climatic and environmental variations in the SAYR for the last 1500 yr. The bulk organic carbon and nitrogen isotopic compositions (delta C-13(org) and delta N-15(tot)) are combined with atomic carbon/nitrogen (C/N) ratios to indicate that the sedimentary organic matter in Lake Ngoring originates from autochthonous algae and that the terrestrial input is minor. Comparison of the record of organic carbon isotope values with published records of ice accumulation rate (IAR) of Dunde and Guliya glaciers from the northern QTP, the total solar irradiance (TSI), delta O-18 variations in the Greenland ice core and biologically sensitive indicators (C-37: 4 alkenone, crenarchaeol and bGDGT concentrations) from Lake Qinghai indicate that variations in the delta C-13(org) values in Lake Ngoring sediments reflect lake level fluctuations that are associated with variations in the amount of precipitation and glacier meltwater on the SAYR. High lake level phases indicated by positive shifts of delta C-13(org) values correspond to higher values of the North Atlantic Oscillation Index (NAOI) and lower values of the Southern Oscillation Index (SOIpr). This relation suggests that the hydrologic history in the SAYR is linked to changes in the Indian monsoon and the Westerlies and that both air masses delivered more moisture to the SAYR during high TSI stages. In contrast, variations in the delta N-15(tot) values resemble the multiple paleoclimate proxy records obtained from ice cores, peat sequences, lake sediments, and integrated paleo-records from other QTP sites, suggesting that the delta N-15(tot) values archived in Lake Ngoring sediments provide a history of past lake-water temperature variations that is consistent with the variation history of the temperature-dependent parameters from regional paleo-climatic studies. Global climatic events including the Dark Ages Cold Period, the Medieval Climate Anomaly, the Little Ice Age and Modern Warming in 20th century could be clearly observed in the delta N-15(tot) variations. In general, the delta C-13(org) and delta N-15(tot) values in Lake Ngoring sediments appear to be useful indicators for paleo-environment and paleo-climate reconstructions in alpine oligotrophic freshwater lakes such as this one.
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影响因子：
3.9
作者：
YueHan Lu;P. Meyers;T. Johengen;B. Eadie;J. Robbins;Haejin Han
通讯作者：
YueHan Lu;P. Meyers;T. Johengen;B. Eadie;J. Robbins;Haejin Han
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影响因子：
4
作者：
Shi Feng;Yin Qiuzhen;Nikolova Irina;Berger André;Ramstein Gilles;Guo Zhengtang
通讯作者：
Guo Zhengtang
影响因子：
4.5
作者：
C. Schelske;D. Hodell
通讯作者：
C. Schelske;D. Hodell
DOI：
10.1016/j.palaeo.2012.04.013
发表时间：
2012-06
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
S. Opitz;B. Wünnemann;Bernhard Aichner;E. Dietze;K. Hartmann;U. Herzschuh;J. Ijmker;F. Lehmkuhl
通讯作者：
S. Opitz;B. Wünnemann;Bernhard Aichner;E. Dietze;K. Hartmann;U. Herzschuh;J. Ijmker;F. Lehmkuhl
DOI：
10.1016/j.palaeo.2015.04.025
发表时间：
2015-08
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
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作者：
Hai-cheng Wei;Qi-shun Fan;Yan Zhao;Haizhou Ma;Shan Fashou;Fuyuan An;Q. Yuan
通讯作者：
Hai-cheng Wei;Qi-shun Fan;Yan Zhao;Haizhou Ma;Shan Fashou;Fuyuan An;Q. Yuan