Exposed moss and willow shrubs buried beneath today’s receding East Greenland glaciers can be dated to 400 to 500 years ago, suggesting this period (the early Little Ice Age) was as-warm or warmer than today.
It is widely accepted that Greenland’s surface temperatures were several degrees warmer (McFarlin et al., 2018, Axford et al., 2021) and ice volume and extent much smaller (Nielsen et al., 2018, Weiser et al., 2021), throughout nearly all of the last 8,000 to 10,000 years.
Image Source: Weiser et al., 2021
What may not yet be widely accepted is the conclusion that the modern temperatures and ice extent still fall within the range of a Holocene “cold stage” rather than a warm stage.
A new study documents a much warmer-than-today Early and Middle Holocene in East Greenland, a time when ice caps were “absent” or far less extensive than they are presently. Plant remains buried under retreating glaciers in East Greenland affirm these locations were not covered in glaciers as recently as 400 to 500 years ago.
But the authors also report there were occasionally brief “cold stages” during the Holocene when Greenland’s glacier extent advanced to today’s levels.
“…Renland Ice Cap briefly reach[ed] extents during cold phases that may have been similar to today.”
This suggests that the modern temperatures and ice volumes fall within the range of a “cold stage” too.
Image Source: Medford et al., 2021
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August 19, 2021 at 10:22AM