ACPD 13, 2243–2271, 2013 Improved simulation of group averaged Z. H. Chen et al. Title Page Abstract Introduction Conclusions References Tables Figures ◭ ◮ ◭ ◮ Back Close Full Screen / Esc Printer-friendly Version Interactive Discussion Discussion Paper | Discussion Paper | Discussion Paper | Discussion Paper | Atmos. Chem. Phys. Discuss., 13, 2243–2271, 2013 www.atmos-chem-phys-discuss.net/13/2243/2013/ doi:10.5194/acpd-13-2243-2013 © Author(s) 2013. CC Attribution 3.0 License. Atmospheric Chemistry and Physics Discussions This discussion paper is/has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP if available. Improved simulation of group averaged CO 2 surface concentrations using GEOS-Chem and fluxes from VEGAS Z. H. Chen 1 , J. Zhu 2 , and N. Zeng 3 1 International Center for Climate and Environment Science, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China 2 State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China 3 Department of Meteorology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742-2425, USA Received: 11 September 2012 – Accepted: 14 January 2013 – Published: 22 January 2013 Correspondence to: Z. H. Chen (czh@mail.iap.ac.cn), J. Zhu (jzhu@mail.iap.ac.cn), and N. Zeng (zeng@umd.edu) Published by Copernicus Publications on behalf of the European Geosciences Union. 2243