1 of 46 Causes of interannual variability of tropospheric ozone 1 over the Southern Ocean 2 Junhua Liu 1,2 , Jose M. Rodriguez 2 , Stephen D. Steenrod 1,2 , Anne R. Douglass 2 , Jennifer 3 A. Logan 3 , Mark Olsen 2,4 , Krzysztof Wargan 2,5 , Jerald Ziemke 2,4 4 1 Universities Space Research Association (USRA), GESTAR, Columbia, MD, USA 5 2 NASA Goddard Space Flight Center, Greenbelt, Maryland, USA 6 3 School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 7 USA 8 4 Morgan State University, Baltimore, Maryland, USA 9 5 Science Systems and Applications, Inc., Lanham, MD, USA 10 11 Correspondence to: Junhua Liu (junhua.liu@nasa.gov) 12 Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-692, 2016 Manuscript under review for journal Atmos. Chem. Phys. Published: 10 October 2016 c  Author(s) 2016. CC-BY 3.0 License.