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Paleoclimate simulations for North America over the past 21,000 years: features of the simulated climate and comparisons with paleoenvironmental data
Holocene thermal maximum in the western Arctic (0-180°W)
Climate change and Arctic ecosystems: 2. Modeling, paleodata‐model comparisons, and future projections
Large variations in the composition, structure, and function of Arctic ecosystems are determined by climatic gradients, especially of growing-season warmth, soil moisture, and snow cover. A unified…
Beringia as a glacial refugium for boreal trees and shrubs: new perspectives from mapped pollen data
The rapid post-glacial migration rate reported for Picea in western Canada may be over estimated, and the expansion of trees and shrubs within Beringia should have been nearly contemporaneous with climatic change, suggesting boreal trees or shrubs are capable of surviving long periods in relatively small populations.
Thermokarst Lakes as a Source of Atmospheric CH4 During the Last Deglaciation
It is found that CH4 bubbling from newly forming thermokarst lakes comprised 33 to 87% of the high-latitude increase in atmospheric methane concentration and, in turn, contributed to the climate warming at the Pleistocene-Holocene transition.
Temperature and precipitation history of the Arctic
Glacial Survival of Boreal Trees in Northern Scandinavia
The presence of a rare mitochondrial DNA haplotype of spruce that appears unique to Scandinavia and with its highest frequency to the west is shown—an area believed to sustain ice-free refugia during most of the last ice age, challenging current views on survival and spread of trees as a response to climate changes.
Fifty thousand years of Arctic vegetation and megafaunal diet
The authors' analyses indicate that both graminoids and forbs would have featured in megafaunal diets, and question the predominance of a Late Quaternary graminoid-dominated Arctic mammoth steppe.
Changes in fire regimes since the Last Glacial Maximum: an assessment based on a global synthesis and analysis of charcoal data
Fire activity has varied globally and continuously since the last glacial maximum (LGM) in response to long-term changes in global climate and shorter-term regional changes in climate, vegetation,…
Wildfire responses to abrupt climate change in North America
- J. Marlon, P. Bartlein, C. Whitlock
- Environmental Science, GeographyProceedings of the National Academy of Sciences
- 24 February 2009
It is widely accepted, based on data from the last few decades and on model simulations, that anthropogenic climate change will cause increased fire activity. However, less attention has been paid to…