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• W2364574397 abstract "Peat column from the Dajiu Lake basin provides 25aresolution records showing climatic changes since the last 2 600 years. By means of multiple regression analyses, a model for pollenclimate is established and a highresolution record of the climate and environment is constructed. The record is compared with the results from magnetism and XRF measurement and with the environmental change records from other areas in the same period. From these, we know that climate change of the Daqiu Lake basin since the last 2 600 years run roughly consistent with the ZHU Kezhen's temperature curve and the Greenland isotopic curve, and also with the curve of substitute indices for the lacustrine sediments in the east of the QinghaiTibet Plateau. Attention should be specially paid to the relatively warm period of 550—1300AD, whose time span is nearly the same as the SuiTang Dynasty warm period (600—1000AD) in the east of China first proposed by ZHU Kezhen and as the medieval warm period in Europe (930—1240AD). The whole climatic record can be divided into four periods: ①relatively coldwet period of 600BC—550AD; ②relatively cooldry period of 550—1300AD; ③coldwet period of 1300—1900AD, with the coldest time (1400—1900AD) corresponding to the Little Ice Age; ④climate turning to relatively cooldry again (from 1900AD to present). The peat core (DJH3) has quite low values of magnetism parameters such as χlf, SIRM and χARM, indicating that concentrations of magnetic minerals in the peat are low due to the dilution of humus and other organic materials. In the core, the χfd% values of all samples are near zero, and the values of S300mT% and S100mT% for most of the samples are near 100 percent, implying that magnetism of the peat core is dominated by fine ferromagnetic minerals. There is a good correspondence between the fluctuating curve of χlf/Fe (the ratio of susceptibility and Fe content) in the DJH3 core and that of the reconstructed climate in the top section of the Liu3 core. This suggests that there must be a close relation among susceptibility, Fe content and climate change. The parameter χlf/Fe may be used as a good substitute indicator of paleoclimate records in the peat profiles." @default.
• W2364574397 created "2016-06-24" @default.
• W2364574397 creator A5035273700 @default.
• W2364574397 date "2003-01-01" @default.
• W2364574397 modified "2023-09-25" @default.
• W2364574397 title "CLIMATIC CHANGES RECORDED IN PEAT FROM THE DAJIU LAKE BASIN IN SHENNONGJIA SINCE THE LAST 2 600 YEARS" @default.
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