During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm repeatedly. Daily levels of CO2 can vary due to weather, and there are seasonal trends as well.
Weather Extremes and Heat Trapping Waves
A new study by scientists from Potsdam University links severe regional weather extremes observed in recent years to persistent disturbances in patterns of atmospheric flows in the northern hemisphere associated with climate change. For more information, see http://www.pik-potsdam.de/news/press-releases/weather-extremes-provoked-by-trapping-of-giant-waves-in-the-atmosphere.
