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Atmospheric CO2 Levels Rose at Record Rate in 2016 –WMO

WMO GREENHOUSE GAS BULLETIN (No. 13) 30 Oct. 2017

‘The State of Greenhouse Gases in the Atmosphere Based on Global Observations through 2016’

Excerpts from Report’s Executive Summary:

Analysis of observations from the WMO GAW Program shows that globally averaged surface mole fractions calculated for CO₂ , methane (CH₄) and nitrous oxide (N₂O) reached new highs in 2016, with

• CO₂ at 403.3 ± 0.1 pp [or 145% pre-industrial – before 1750 – levels.]
• CH₄ at 1 853 ± 2 ppb [257%]
• N₂O at 328.9 ± 0.1 ppb [122%]

The record increase of 3.3 ppm in CO₂ from 2015 to 2016 was larger than the previous record increase, observed from 2012 to 2013, and the average growth rate over the last decade. The increase of CH₄ from 2015 to 2016 was slightly smaller than that observed from 2014 to 2015, but larger than the average over the last decade. The increase of N₂O from 2015 to 2016 was also slightly smaller than that observed from 2014 to 2015 and the average growth rate over the past 10 years. The National Oceanic and Atmospheric Administration (NOAA) Annual Greenhouse Gas Index (AGGI) shows that from 1990 to 2016, radiative forcing by long-lived greenhouse gases (LLGHGs) increased by 40%, with CO₂ accounting for about 80% of this increase. The WMO GAW Program (http://www.wmo.int/gaw)

Up-to-date weekly average CO₂at Mauna Loa, Hawaii
Week beginning on October 22, 2017: 404.01 ppm
Weekly value from 1 year ago: 401.83 ppm
Weekly value from 10 years ago: 381.44 ppm
Last updated: October 30, 2017

Full CO₂ record at Mauna Loa

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