Article: Early middle Holocene climate oscillations recorded in the Beihuqiao Core, Yuhang, Zhejiang Province, China
Journal of paleolimnology. 2018 Feb., v. 59, no. 2
2018
Abstract: A long-standing controversy exists concerning the spatial and temporal characteristics of Holocene climate change in China. Zhejiang is located in the southeast of China, where the East Asian monsoon dominates the climate and a Neolithic culture ... ...
| Abstract | A long-standing controversy exists concerning the spatial and temporal characteristics of Holocene climate change in China. Zhejiang is located in the southeast of China, where the East Asian monsoon dominates the climate and a Neolithic culture flourished. In recent years, geographers have debated the climatic conditions existing at the time of the Neolithic cultures. This study reconstructed the sedimentary environment between 11.30 and 4.17 cal ka BP based on a multi-proxy analysis of a 14.3 meter sediment core, drilled in Beihuqiao, Zhejiang Province, China. The results show: (1) The climate was getting warm between 11.50 and 8.77 cal ka BP. Grain size became finer from the bottom to the top layer, accompanied by an increase in the chemical index of alteration (CIA), Mg/Sr ratio, the percentage of clay, pollen concentrations, and a decrease in SiO₂/Al₂O₃ ratio, and the value of bases–alumina (ba), as well as other trace elements. (2) Between 8.77 and 7.99 cal ka BP, the sediment is composed of gray-yellow and gray silt. The percentage of CaO and the ratio of CaO + Na₂O + K₂O to Al₂O₃ is much higher. The pollen concentration sharply decreases. The climate was cold and dry in the early stages of this period, but became relatively warmer and wetter in the later stages. (3) The Holocene Climatic Optimum occurred at 7.99–5.68 cal ka BP. Higher contents of clay, total Fe₂O₃, Al₂O₃, CIA, the chemical proxy of alteration, pollen concentration, evergreen pollens, and high values of Mg/Sr are observed at this stage, coinciding with a lower SiO₂/Al₂O₃ value, (CaO + Na₂O + K₂O)/Al₂O₃ ratio, and an obvious reduction in silt/clay, and SiO₂ and CaO concentrations. (4) During the period 5.68–4.17 cal ka BP, the temperature in the study area declined in a stepwise fashion. The grain size became finer, and the Mg/Sr ratio decreased gradually. |
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| Keywords | aluminum oxide ; calcium oxide ; clay ; climate change ; climatic factors ; ferric oxide ; limnology ; magnesium ; monsoon season ; paleontology ; pollen ; silica ; silt ; strontium ; temperature ; China |
| Language | English |
| Dates of publication | 2018-02 |
| Size | p. 263-278. |
| Publishing place | Springer Netherlands |
| Document type | Article |
| ZDB-ID | 1478181-5 |
| ISSN | 1573-0417 ; 0921-2728 |
| ISSN (online) | 1573-0417 |
| ISSN | 0921-2728 |
| DOI | 10.1007/s10933-017-9959-x |
| Database | NAL-Catalogue (AGRICOLA) |
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