Holocene climatic change reconstructed from diatoms, chironomids, pollen and near-infrared spectroscopy at an alpine lake (Sjuodjijaure) in northern Sweden
Holocene climatic change reconstructed from diatoms, chironomids, pollen and near-infrared spectroscopy at an alpine lake (Sjuodjijaure) in northern Sweden
复制标题
利用瑞典北部高山湖泊 (Sjuodjijaure) 的硅藻、摇蚊、花粉和近红外光谱重建全新世气候变化
DOI：
10.1191/095968301680223503
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
H. J. B. Birks
中科院分区：
文献类型：
--
作者：
P. Rosén;U. Segerström;L. Eriksson;I. Renberg;H. J. B. Birks
介绍了重建瑞典北部过去 9300 年气候历史的多代理研究结果。它基于硅藻、摇蚊和花粉分析以及近红外光谱 (NIRS)，对 Sjuodjijaure（北纬 67°22，东经 18°04）的放射性碳测年沉积物岩心进行了分析，该岩心位于斯坎德斯山脉林木线以上 100 m。使用为该地区建立的传递函数重建了七月平均气温。生物指标显示全新世期间成分发生了显着变化，推断的温度都遵循相同的总体趋势。大约 9300 至 7300 cal 之间的时期。由于训练集中缺乏令人信服的现代类似物，BP 重建应谨慎解释。然而重建表明，7 月份的平均气温与今天大致相同，有几次快速的短期寒冷和温暖时期。寒冷时期可追溯到约 8500、8200 和 7600 年。年 BP 和大约 7700 cal 的温暖期。血压。约7300卡路里英国石油公司（BP）表示，气候发生了重大转变。松树迁移到了该地区，该地区以前被白桦林覆盖。从全新世中期到今天，沉积物记录表明树木极限不断下降，七月温度逐渐降低。
The results of a multiproxy study reconstructing the climate history of the last 9300 years in northern Sweden are presented. It is based on diatom, chironomid and pollen analyses, as well as near-infrared spec troscopy (NIRS), of a radiocarbon dated sediment core from Sjuodjijaure (67°22N, 18°04E), situated 100 m above tree-line in the Scandes mountains. Mean July air temperature was reconstructed using transfer functions established for the region. The biological proxies show significant changes in composition during the Holocene and the inferred temperatures all follow the same general trend. For the period between about 9300 to 7300 cal. BP the reconstructions should be interpreted with caution due to the lack of convincing modern analogues in the training set. However the reconstruction suggest that July temperature was on average about the same as today, with several rapid short-term cold and warm periods. Cold periods were dated to about 8500, 8200 and 7600 cal. years BP and a warm period to about 7700 cal. BP. About 7300 cal. BP, a major shift to a warmer climate occurred. Pine migrated into the area, which was previously covered with birch forest. From the mid-Holocene until today the sediment record suggests a descending tree-limit and a gradual lowering of July temperature.