D/H ratios of methoxyl groups of the sedimentary organic matter of Lake Holzmaar (Eifel, Germany): A potential palaeoclimate/-hydrology proxy
D/H ratios of methoxyl groups of the sedimentary organic matter of Lake Holzmaar (Eifel, Germany): A potential palaeoclimate/-hydrology proxy
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霍尔兹马尔湖（德国埃菲尔）沉积有机质的甲氧基 D/H 比：潜在的古气候/水文代理
DOI：
10.1016/j.gca.2014.08.001
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发表时间：
2014
影响因子：
5
通讯作者：
Keppler
中科院分区：
文献类型：
--
作者：
Anhäuser;Sirocko;Greule;Keppler
来自不同地点的各种植物类型的木质素和果胶中甲氧基的稳定氢同位素比值（δD值）已被证明反映了降水的δD值，具有平均均匀的同位素分馏。降水中δD主要受温度、蒸发量和降水量等气候条件的影响，因此有机质甲氧基基团可作为古气候指标。在这里，我们测量了来自Holzmaar湖（Eifel，德国）沉积物芯段的沉积有机质的甲氧基的δD值。沉积物岩心覆盖了整个全新世和晚冰期的一部分（直到13，650年BP）。由于沉积有机质主要由植物源的有机物源指标指示，因此我们认为甲氧基的δD值可作为湖水δD值的指标。目前和可能在全新世的大部分时间里，降水的δD值主要受温度（2-4.5‰/°C）控制，并与湖水的δD值处于同位素平衡状态。我们使用这些现代的温度敏感性的艾菲尔地区的沉积有机质的甲氧基测量的δD值，以评估记录的全新世的温度变化。由此产生的平均温度变化始终小于1.8-4 °C，与同期NGRIP冰芯报告的结果大致一致。从全新世到晚冰期的过渡时期，甲氧基的δD值更负（新仙女木为13‰）。除了与温度的关联，我们假设一个更高的敏感性湖Holzmaar的δD值蒸发富集在新仙女木，这可以作为现有的古气候/水文记录的艾菲尔铁塔地区的差异报告的解释。我们的研究结果表明，甲氧基的δD值有很大的潜力，以协助古气候和古水文，特别是当有机质是很好的特点和统一的起源。
Stable hydrogen isotope ratios (δD values) of methoxyl groups in lignin and pectin from a variety of plant types from different locations have been shown to mirror δD values of precipitation, with a mean uniform isotopic fractionation. Since δD in precipitation is mainly influenced by climatic conditions, including temperature, evaporation and precipitation amount, methoxyl groups of organic matter have been proposed as a potential palaeoclimate proxy. Here, we measured the δD values of the methoxyl groups of sedimentary organic matter derived from sediment core segments of Lake Holzmaar (Eifel, Germany). The sediment core covers the entire Holocene and part of the Late Glacial (until 13,650 years BP). Since the sedimentary organic matter was indicated by organic source proxies of predominantly phytoplanktonic origin, we considered the δD values of the methoxyl groups as a proxy for the δD value of the lake water. Presently and probably during most of the Holocene, the δD value of precipitation was primarily controlled by temperature (2–4.5‰/°C) as well as in isotopic equilibrium with the δD value of the lake water. We used these modern temperature sensitivities of the Eifel region together with the measured δD values of the methoxyl groups of the sedimentary organic matter to evaluate temperature changes recorded for the Holocene. The resulting mean temperature variance was found to be consistently less than 1.8–4 °C and is broadly in line with that reported from the NGRIP ice core for the same period. The transition from the Holocene to the Late Glacial period was accompanied with more negative δD values of the methoxyl groups (∼13‰ for the Younger Dryas). Besides the association with temperature we assumed a higher susceptibility of the δD value of Lake Holzmaar to evaporative enrichment during the Younger Dryas which could serve as an explanation for discrepancies reported for existing palaeoclimate/-hydrology records of the Eifel region. Our findings indicate that the δD values of methoxyl groups have great potential for assisting with palaeoclimate and palaeohydrology, particularly when the organic matter is well characterized and of uniform origin.
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影响因子：
5
作者：
D. Sachse;J. Radke;G. Gleixner
通讯作者：
D. Sachse;J. Radke;G. Gleixner
影响因子：
3
作者：
Aichner, Bernhard;Herzschuh, Ulrike;Boehner, Juergen
通讯作者：
Boehner, Juergen
藻类中聚糖的结构进化
DOI：
--
发表时间：
1983
期刊：
影响因子：
--
作者：
T. Painter
通讯作者：
T. Painter
对金铬蛋白石鳖细胞内和细胞表面高尔基体产生的鳞片的物理和化学研究 Parke et Manton
DOI：
--
发表时间：
1967
期刊：
影响因子：
--
作者：
J. Green;D. H. Jennigs
通讯作者：
D. H. Jennigs
影响因子：
5.2
作者：
EPSTEIN, S
通讯作者：
EPSTEIN, S