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The annual average CO2 difference between baseline data fromMauna Loa and the Southern Hemisphere increased by ∼  0.8 µmol mol−1 (0.8 ppm) between 2009 and 2010, astep unprecedented in over 50 years of reliable data. We find no evidence forcoinciding, sufficiently large source and sink changes. A statistical anomalyis unlikely due to the highly systematic nature of the variation inobservations. An explanation for the step, and the subsequent 5-yearstability in this north–south difference, involves interhemisphericatmospheric exchange variation. The selected data describing this episodeprovide a critical test for studies that employ atmospheric transport modelsto interpret global carbon budgets and inform management of anthropogenicemissions

The 2009–2010 step in atmospheric CO&lt;sub&gt;2&lt;/sub&gt; interhemispheric difference

The 2009–2010 step in atmospheric CO<sub>2</sub> interhemispheric difference