Arctic Ice Nov 1, 2020 1:45:15 GMT
Post by sigurdur on Nov 1, 2020 1:45:15 GMT
Arctic sea ice has reduced drastically over the past few decades, recognized in both satellite observations and model simulations8,10,11. Since 1980, the sea-ice cover has had a mean annual areal reduction of ~20% and an even stronger decrease of ~30% in September7. This decrease in sea ice is also suggested to be the driver of frequent cold extremes over Eurasia in the past two decades12. Historical observations spanning the last few decades are deficient in length to decipher the processes of accelerated sea-ice retreat, thus longer-term and high-resolution proxy records of paleoenvironmental changes are needed. During transition from the last deglacial to the Holocene, the climate system underwent numerous abrupt changes, particularly the Bølling/Allerød (B/A) interstadial and the Younger Dryas (YD) stadial. The Holocene, not concluded yet, has experienced a significantly warmer period during its early stage (Early Holocene Thermal Maximum)13. Causes of the abrupt climate change are not fully understood, hence special emphasis on the transition from the deglacial into the Holocene is of significance to understand the forcing mechanisms of the climate system. In this context, the Arctic marginal seas characterized by strong seasonal variability in sea-ice cover, primary productivity, and terrigenous (riverine) input are very sensitive to environmental changes and thus of major importance for paleoclimate reconstructions. One of these marginal seas is the Beaufort Sea (Fig. 1), which we focus on in this paper.