These results identify the importance of shifting catchment boundary conditions on sediment yield throughout the Holocene, and also indicate the difficulty of interpreting low-frequency yield variations as the direct consequence of changing climate in similar varve records. Drying of the cores may lead to a slight reduction in varve thickness but the pattern of change from year to year is still preserved. The magnitude of the warming and decade-scale variability throughout the records, however, indicate that natural forcing mechanisms such as changing solar irradiance and volcanic activity, as well as positive feedbacks within the Arctic environment, also play an important role. An increase in the annual deposition of both organic as well as mineral matter has occurred due to land use. Registered as a company limited by guarantee and registered in England No.
A satisfactory explanation of pollen sedimentation lags will require more studies that examine internal lake dynamics i.
Our results show that the Etoliko varve record became more sensitive to climate change from AD onwards. Request full-text. Deep Time. Thus, varved sediments provide a powerful tool for paleoecological reconstruction at seasonal resolutions. This technical note presents a method for the impregnation of marine sediment core subsamples for the preparation of thin sections. Quaternaria, Series A 294 pp. Varved lake sediments are well known archives used for paleoenvironmental reconstructions.