Sergei Zimov

TL;DR: In this article, the authors reported a new estimate of the carbon pools in soils of the northern permafrost region, including deeper layers and pools not accounted for in previous analyses.

TL;DR: In this article, the authors present an overview of the global permafrost C pool and of the processes that might transfer this C into the atmosphere, as well as the associated ecosystem changes that occur with thawing.

TL;DR: A detailed genetic history of bison throughout the late Pleistocene and Holocene epochs is reconstructed using ancient DNA and Bayesian techniques to reconstruct a large diverse population living throughout Beringia until around 37,000 years before the present, when the population's genetic diversity began to decline dramatically.

TL;DR: Results indicate that mammalian grazers have a sufficiently large effect on vegetation and soil moisture that their extinction could have contributed substantially to the shift from predominance of steppe to tundra at the Pleistocene-Holocene boundary.

TL;DR: In this article, permafrost soils from four tundra and boreal forest locations in northeastern Siberia were incubated at controlled temperatures (5, 10 and 15°C) to determine their potential to release carbon to the atmosphere when thawed.