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April CO2 Topped 400ppm Over Northern Hemisphere - WMO

26.05.2014 17:07 Age: 3 yrs

Monthly concentrations of carbon dioxide (CO2) in the atmosphere topped 400 parts per million (ppm) in April 2014 throughout the northern hemisphere, according to the World Meteorological Organization (WMO).

Click to enlarge. Global CO2 measurements. Preliminary CO2 mole fractions at the GAW global stations (March 2014; April 2014)Legend and data courtesy: ALT:  Alert, Canada, 82.50°N, 62.34°W, 210 m a.s.l. (Environment Canada, Canada). AMS: Amsterdam Island, France, 37.80°S, 77.54°E, 70 m a.s.l. (Research program "SNO ICOS-France" led by LSCE/OVSQ (CEA, INSU)). BRW:  Barrow (AK), USA, 71.32°N, 156.6°W, 11 ma.s.l. (NOAA, USA). CNM:  Monte Cimone, Italy,  44.17°N, 10.68°E,  2165 m a.s.l. (Italian Air Force Mountain Centre - Mt. Cimone, Italy). CVO: Cape Verde Atmospheric Observatory, Cape Verde, 16.86°N, 24.87°W, 10 m a.s.l. (Max Planck Institute for Biogeochemistry, Jena, Germany). HPB: Hohenpeissenberg, Germany, 47.80°N,  11.01°E,  985 m (Deutscher Wetterdienst (DWD), Germany). IZO: Izaña (Tenerife),  Spain,  28.31°N, 16.50°W,  2373 m a.s.l. (Agencia Estatal De Meteorología (Aemet), Spain)


Carbon dioxide (CO2) levels reached 400 parts per million (ppm) throughout the northern hemisphere in April for the first time, according to the World Meteorological Organization (WMO).

All the northern hemisphere monitoring stations forming the WMO's Global Atmosphere Watch network reported record atmospheric CO2 concentrations during the seasonal maximum. This occurs early in the northern hemisphere spring before vegetation growth absorbs CO22 are higher in the northern hemisphere that in the southern hemisphere. And CO2 concentrations on the southern hemisphere tend to lag behind. NOAA predicts that the global average will reach 400ppm in 2016. Eventually, some time around 2020, the 400ppm level will be reached in the Antarctic; and then the whole world will record levels at or above 400ppm.

Here is the text of the press release issued by the


WMO news release here.