Holocene hydrological variability of Lake Ladoga, northwest Russia, as inferred from diatom oxygen isotopes
Holocene hydrological variability of Lake Ladoga, northwest Russia, as inferred from diatom oxygen isotopes
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根据硅藻氧同位素推断俄罗斯西北部拉多加湖全新世水文变化
作者：
S. Kostrova;H. Meyer;H. Bailey;A. Ludikova;R. Gromig;G. Kuhn;Yuri A. Shibaev;A. Kozachek;A. Ekaykin;B. Chapligin
本文对俄罗斯西北部拉多加湖全新世水文变化进行了新的综合评估。该重建基于沉积岩芯 Co 1309 中保存的湖相硅藻二氧化硅 (δ18Odiatom) 的氧同位素，并辅以硅藻组合分析和现代同位素水文学调查。数据表明，拉多加湖至少自 10.8 cal 以来就作为淡水水库存在。卡BP。 δ18O硅藻值范围为+29.8至+35.0‰，相对较高的δ18O硅藻值约为+34.7‰。 7.1 和 5.7 卡。 ka BP 被认为反映了全新世最高热值。自c.以来δ18硅藻持续减少。 6.1 卡路里ka BP 在 c 之后加速。 4 卡路里。 ka BP，表明全新世中后期冷却在 0.8-0.2 cal 区间内达到顶峰。 ka BP，对应小冰河时期。湖泊水位上升导致 δ18Odiatom 值降低，而湖泊水位降低则导致 δ18Odiatom 值升高。硅藻同位素记录表明，涅瓦河流出道在大约 100 年前相当早地开放。 4.4–4.0 卡路里卡BP。一般来说，δ18硅藻值总体较高，约为+33.5‰，是整个全新世持续蒸发湖系统的特征。由于拉多加湖 δ18Odiatom 记录与 60°N 夏季日照大致一致，因此可能与更广泛的气候变化有关。
This article presents a new comprehensive assessment of the Holocene hydrological variability of Lake Ladoga, northwest Russia. The reconstruction is based on oxygen isotopes of lacustrine diatom silica (δ18Odiatom) preserved in sediment core Co 1309, and is complemented by a diatom assemblage analysis and a survey of modern isotope hydrology. The data indicate that Lake Ladoga has existed as a freshwater reservoir since at least 10.8 cal. ka BP. The δ18Odiatom values range from +29.8 to +35.0‰, and relatively higher δ18Odiatom values around +34.7‰ between c. 7.1 and 5.7 cal. ka BP are considered to reflect the Holocene Thermal Maximum. A continuous depletion in δ18Odiatom since c. 6.1 cal. ka BP accelerates after c. 4 cal. ka BP, indicating Middle to Late Holocene cooling that culminates during the interval 0.8–0.2 cal. ka BP, corresponding to the Little Ice Age. Lake‐level rises result in lower δ18Odiatom values, whereas lower lake levels cause higher δ18Odiatom values. The diatom isotope record gives an indication for a rather early opening of the Neva River outflow at c. 4.4–4.0 cal. ka BP. Generally, overall high δ18Odiatom values around +33.5‰ characterize a persistent evaporative lake system throughout the Holocene. As the Lake Ladoga δ18Odiatom record is roughly in line with the 60°N summer insolation, a linkage to broader‐scale climate change is likely.
用于分析生物二氧化硅氧同位素组成的纯化和污染校正方法的评估
影响因子：
3.9
作者：
Chapligin;Snyder;Kemnitz
通讯作者：
Kemnitz
Akademii Nauk 冰芯（北地岛）记录的过去千年欧亚北极气候
影响因子：
4.3
作者：
Opel T;Fritzsche D;Meyer H
通讯作者：
Meyer H
俄罗斯北极远东 Elgygytgyn 湖硅藻的 250 ka 氧同位素记录
影响因子：
4.3
作者：
Chapligin B
通讯作者：
Chapligin B