CR
Cryospheric Sciences

Image of the Week: Atmospheric CO2 from ice cores

Image of the Week: Atmospheric CO2 from ice cores

The measurements of atmospheric CO2 levels at Manu Loa, Hawaii read 401.01ppm on the 7th of December this year. To understand the significance of this number, you just need to look at the figure above from the 4th IPCC report. It shows the changes in CO2 concentrations during the past 800,000 years based on ice core measurements. Values have fluctuated between 190ppm and 280ppm. In other words, both the level of present-day atmospheric CO2 and the rapidity of the increase is unprecedented.

The figure also shows the projections from the IPCC AR4 report for different emission scenarios. Which scenario will turn out to be the most likely might be determined at COP21 in Paris right now.

Read more:

Measurements at Manu Loa, Hawaii

Nanna B. Karlsson is a post-doc at the Alfred Wegener Institute for Marine and Polar Research in Germany. She is using radar data and ice flow models to look for the oldest ice in Antarctica: Ice that is more than 1 million years old. She is also involved in projects looking at ice on Mars, Greenland and northern Norway. She tweets as @icymatters .

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