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Atmospheric Carbon Dioxide Update

Posted by feww on April 29, 2013

Weekly average CO2 at Mauna Loa Observatory 

  • Week of April 21, 2013:     398.68 ppm
  • Weekly value from 1 year ago:     396.66 ppm
  • Weekly value from 10 years ago:     378.46 ppm

One Year of  CO2 daily and weekly means at Mauna Loa

co2- weekly mlo
The graph, updated weekly, shows as individual points daily mean CO2 up to and including the week (Sunday through Saturday) previous to today. The daily means are based on hours during which CO2 was likely representative of “background” conditions, defined as times when the measurement is representative of air at mid-altitudes over the Pacific Ocean. That air has had several days time or more to mix, smoothing out most of the CO2 variability encountered elsewhere, making the measurements representative of CO2 over hundreds of km or more. The selection process is designed to filter out any influence of nearby emissions, or removals, of CO2 such as caused by the vegetation on the island of Hawaii, and likewise emissions from the volcanic crater of Mauna Loa.  Source: ESRL/NOAA

Recent Mauna Loa CO2

  • March 2013:     397.34 ppm
  • March 2012:     394.45 ppm

Recent Global CO2

  • February 2013:     395.98 ppm
  • February 2012:     393.05 ppm

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