Why are models unable to reproduce multi-decadal trends in lower tropospheric baseline ozone levels?

Lu Hu, University of Montana, Department of Chemistry and Biochemistry, Missoula, United States, Junhua Liu, Universities Space Research Association Greenbelt, Greenbelt, MD, United States; NASA GSFC/USRA GESTAR, Greenbelt, MD, United States, Loretta J Mickley, Harvard University, School of Engineering and Applied Sciences, Cambridge, MA, United States, Susan Elaine Strahan, NASA Goddard Space Flight Center, Greenbelt, United States and Steve Steenrod, Universities Space Research Association Columbia, Columbia, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States