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.
Ozone Hole and Ocean Circulation
Research from Dr. Darryn W. Waugh of Johns Hopkins University and his colleagues, published recently in Science magazine, shows a link between ozone depletion, surface winds, and ocean circulation. Their results, based in part on measurements of chloroflurocarbon-12 abundance in the Southern Oceans from the early 1990s to late 2000s, show that subtropical intermediate waters are "younger" while upwelling, circumpolar waters are "older". These changes are consistent with a response of the Earth system to strengthened surface winds due to thinning of the ozone layer, resulting in increased ocean ventilation.
More more information about this research, visit http://hub.jhu.edu/2013/01/31/ozone-thinning-and-ocean-circulation.
