Kevin Robert Gurney Department of Atmospheric Science, Colorado State University, Fort Collins, CO, 80523 Rachel M. Law CSIRO Atmospheric Research, PMB 1, Aspendale, Victoria 3195, Australia A. Scott Denning Department of Atmospheric Science, Colorado State University, Fort Collins, CO, 80523 Peter J. Rayner CSIRO Atmospheric Research, PMB 1, Aspendale, Victoria 3195, Australia David Baker National Center for Atmospheric Research (NCAR), Boulder, CO 80303 Philippe Bousquet Laboratoire des Sciences du Climat et de l'Environment (LSCE), F-91198 Gif-sur-Yvette Cedex, France Lori Bruhwiler National Oceanic and Atmospheric Administration (NOAA), Climate Monitoring and Diagnostics Laboratory, 326 Broadway R/CG1, Boulder, CO 80303 Yu-Han Chen Department of Earth, Atmospheric, and Planetary Science, Massachussetts Institute of Technology (MIT), Cambridge, MA 02141 Philippe Ciais Laboratoire des Sciences du Climat et de l'Environment (LSCE), F-91198 Gif-sur-Yvette Cedex, France Songmiao Fan AOS Program, Princeton University, Sayre Hall, Forrestal Campus P.O. Box CN710 Princeton, NJ 08544-0710 Inez Fung Center for Atmospheric Sciences, McCone Hall, University of California, Berkeley, Berkeley, CA 94720-4767 Manuel Gloor Max-Planck_Institute fur Biogeochemie, D-07701 Jena, Germany Martin Heimann Max-Planck_Institute fur Biogeochemie, D-07701 Jena, Germany Kaz Higuchi Meteorological Service of Canada, Environment Canada, Toronto, Ontario M3H 5T4 Canada Jasmin John Center for Atmospheric Sciences, McCone Hall, University of California, Berkeley, Berkeley, CA 94720-4767 Takashi Maki Quality Assurance Section, Atmospheric Environment Division, Observations Department, Japan Meteorological Agency 1-3-4 Otemachi, Chiyoda-ku, Tokyo 100-8122 Japan Shamil Maksyutov Institute for Global Change Research, Frontier Research System for Global Change, Yokohama, 236-0001 Japan Philippe Peylin Laboratoire des Sciences du Climat et de l'Environment (LSCE), F-91198 Gif-sur-Yvette Cedex, France Michael Prather Earth System Science, University of California, Irvine, CA 92697-3100 Bernard C. Pak Earth System Science, University of California, Irvine, CA 92697-3100 Jorge Sarmiento AOS Program, Princeton University, Sayre Hall, Forrestal Campus P.O. Box CN710 Princeton, NJ 08544-0710 Shoichi Taguchi National Institute of Advanced Industrial Science and Technology, 16-1 Onogawa Tsukuba, Ibaraki 305-8569 Japan Taro Takahashi Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY Chiu-Wai Yuen Meteorological Service of Canada, Environment Canada, Toronto, Ontario M3H 5T4 Canada