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New Geochemical Method Highlights Links Between Terrestrial Climate and Atmospheric Carbon Dioxide
http://today.uconn.edu/blog/2013/04/new-geochemical-method-highlights-links-between-terrestrial-climate-and-atmospheric-carbon-dioxide/[font face=Serif][font size=5]New Geochemical Method Highlights Links Between Terrestrial Climate and Atmospheric Carbon Dioxide[/font]
April 22, 2013
By: Christine Buckley, College of Liberal Arts and Sciences
[font size=3]Nearly 34 million years ago, the Earth underwent a transformation from a warm, high-carbon dioxide “greenhouse” state to a lower-CO[font size="1"]2[/font], variable climate similar to the modern “icehouse” world. Massive ice sheets grew across the Antarctic continent, major animal groups shifted, and ocean temperatures decreased by as much as 5 degrees.
But studies of how this drastic change affected temperatures on land have had mixed results. Some show no appreciable terrestrial climate change; others find cooling of up to 8 degrees and large changes in seasonality.
…
Studies have shown that before this drastic cooling event, Earth’s atmosphere contained 1,000 parts per million (ppm) of CO[font size="1"]2[/font] or more, and by the end of the transition, it was likely lower than 600-700 ppm. Some predictions, notes Hren, suggest that Earth’s current CO[font size="1"]2[/font] concentrations, currently at close to 400 ppm and climbing, could increase to nearly 1,000 ppm in the next 100 years.
…
“We are on a path to fundamentally alter our global climate state,” says Hren. “These data definitely give you pause.”
…[/font][/font]
http://www.pnas.org/content/early/2013/04/19/1210930110
April 22, 2013
By: Christine Buckley, College of Liberal Arts and Sciences
[font size=3]Nearly 34 million years ago, the Earth underwent a transformation from a warm, high-carbon dioxide “greenhouse” state to a lower-CO[font size="1"]2[/font], variable climate similar to the modern “icehouse” world. Massive ice sheets grew across the Antarctic continent, major animal groups shifted, and ocean temperatures decreased by as much as 5 degrees.
But studies of how this drastic change affected temperatures on land have had mixed results. Some show no appreciable terrestrial climate change; others find cooling of up to 8 degrees and large changes in seasonality.
…
Studies have shown that before this drastic cooling event, Earth’s atmosphere contained 1,000 parts per million (ppm) of CO[font size="1"]2[/font] or more, and by the end of the transition, it was likely lower than 600-700 ppm. Some predictions, notes Hren, suggest that Earth’s current CO[font size="1"]2[/font] concentrations, currently at close to 400 ppm and climbing, could increase to nearly 1,000 ppm in the next 100 years.
…
“We are on a path to fundamentally alter our global climate state,” says Hren. “These data definitely give you pause.”
…[/font][/font]
http://dx.doi.org/10.1073/pnas.1210930110
3 replies
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