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Journal Highlights Arctic Sea Ice Study by UM Professor
http://news.umt.edu/2013/07/070813arct.aspx[font face=Serif][font size=5]Journal Highlights Arctic Sea Ice Study by UM Professor[/font]
Jul. 09, 2013
[font size=3]MISSOULA – New research by UM bioclimatology Assistant Professor Ashley Ballantyne models the influence of Arctic sea ice on Arctic temperatures during the Pliocene era. His research was published in the Research Highlight section of the July issue of Nature Geoscience. The full paper will be published in Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geosciences.
…
Atmospheric carbon dioxide concentrations recently reached 400 parts per million for the first time since the Pilocene Epoch, three million years ago. During this era, Arctic surface temperatures were 15-20 degrees Celsius warmer than today’s surface temperatures.
Ballantyne’s findings suggest that much of the surface warming likely was due to ice-free conditions in the Arctic. That finding matches estimates of land temperatures in the Arctic during the same time. This suggests that atmospheric carbon dioxide concentrations of 400 ppm may be sufficient to greatly reduce the spatial extent and seasonal persistence of Arctic sea ice.
The authors also found that surface temperatures in the Arctic are more sensitive to the amount of sea ice than to the amount of land-based ice. They show that once sea ice is removed, heat lost from the ocean recirculates in the atmosphere and warms the interior land.
…[/font][/font]
Jul. 09, 2013
[font size=3]MISSOULA – New research by UM bioclimatology Assistant Professor Ashley Ballantyne models the influence of Arctic sea ice on Arctic temperatures during the Pliocene era. His research was published in the Research Highlight section of the July issue of Nature Geoscience. The full paper will be published in Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geosciences.
…
Atmospheric carbon dioxide concentrations recently reached 400 parts per million for the first time since the Pilocene Epoch, three million years ago. During this era, Arctic surface temperatures were 15-20 degrees Celsius warmer than today’s surface temperatures.
Ballantyne’s findings suggest that much of the surface warming likely was due to ice-free conditions in the Arctic. That finding matches estimates of land temperatures in the Arctic during the same time. This suggests that atmospheric carbon dioxide concentrations of 400 ppm may be sufficient to greatly reduce the spatial extent and seasonal persistence of Arctic sea ice.
The authors also found that surface temperatures in the Arctic are more sensitive to the amount of sea ice than to the amount of land-based ice. They show that once sea ice is removed, heat lost from the ocean recirculates in the atmosphere and warms the interior land.
…[/font][/font]