las e a interglacial. Pollen spectra from these cores were used to reconstruct past vegetation and climate of the Holocene and last interglacial. In each core, last interglacial sediments yielded remarkably high pollen concentrations, and included far greater variability, and directly involved in se...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.472.5184 http://www.geotop.ca/pdf/devernalA/Frechette_et_al_Paleo3_2006.pdf |
| Summary: | las e a interglacial. Pollen spectra from these cores were used to reconstruct past vegetation and climate of the Holocene and last interglacial. In each core, last interglacial sediments yielded remarkably high pollen concentrations, and included far greater variability, and directly involved in several key preserved in lake sediments are a useful proxy for reconstructing vegetation and climate. Lakes situated at sensitive ecotonal boundaries, such as the Low to Mid Palaeogeography, Palaeoclimatology, Palaeoprocesses that mediate climate change. Consequently,percentages of shrub (Betula and Alnus) pollen grains than did overlying Holocene sediments. Numerical comparisons of fossil pollen assemblages to a data set of 400 modern high-latitude lake sediment samples revealed that the last interglacial vegetation of east-central Baffin Island was Low Arctic in character, comparable to present-day southwest Greenland. From applications of both correspondence analysis regression and best modern analogue methodologies, we infer July air temperatures of the last interglacial to have been 4 to 5 °C warmer than present on eastern Baffin Island, which was warmer than any interval within the Holocene. On these grounds, we ascribe the lower lacustrine unit in these lakes to the climatic optimum of the last interglacial, ca. 117 to 130 ka |
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