1 Effects of temperature and drought on the light response of ecosystem CO2 exchange C. Yi, 1 R. Li, 2 P.S. Bakwin, 3 D.M. Ricciuto, 1 J. W. Munger, 4 S. C. Wofsy, 4 K. Wilson, 5 T. P. Meyers 5 1 Department of Meteorology, the Pennsylvania State University, University Park, PA 16802, USA. Chuixiang Yi (814-865-9617; cxyi@essc.psu.edu ) Kenneth J. Davis (814-863-8601; davis@essc.psu.edu ) Daniel M. Ricciuto (814-865-9617; ricciuto@essc.psu.edu) 2 Department of Statistics, the Pennsylvania State University, University Park, PA 16802, USA. Runze Li, (814-865-1555 rli@stat.psu.edu) 3 NOAA Climate Monitoring and Diagnostics Laboratory, 325 Broadway, Boulder, CO 80305, USA. Peter S. Bakwin (303-497-6773 peter.bakwin@noaa.gov ) 4 Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA. J. William Munger (617-495-5361 jwm@io.harvard.edu ) Steven C. Wofsy (617-495-4566 scw@io.harvard.edu ) 5 NOAA/ATDD, PO Box 2456, Oak Ridge, TN 37831, USA Kell Wilson (423-576-2317 wilson@atdd.noaa.gov) Tilden P. Meyers (423-576-2317 meyers@atdd.noaa.gov) Correspondence: Chuixiang Yi Department of Meteorology The Pennsylvania State University 416 Walker Building University Park, PA 16802 Phone: (814) 865-9617 Fax: (814) 865-3663 Email: cxyi@essc.psu.edu