Journal
BIOGEOSCIENCES
Volume 13, Issue 3, Pages 873-885Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/bg-13-873-2016
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The annual average CO2 difference between baseline data from Mauna Loa and the Southern Hemisphere increased by similar to 0.8 mu mol mol 1 (0.8 ppm) between 2009 and 2010, a step unprecedented in over 50 years of reliable data. We find no evidence for coinciding, sufficiently large source and sink changes. A statistical anomaly is unlikely due to the highly systematic nature of the variation in observations. An explanation for the step, and the subsequent 5-year stability in this north-south difference, involves interhemispheric atmospheric exchange variation. The selected data describing this episode provide a critical test for studies that employ atmospheric transport models to interpret global carbon budgets and inform management of anthropogenic emissions.
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