Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 7 8 2007 10.5194/acp-7-1947-2007 http://www.atmos-chem-phys.net/7/1947/2007/ http://www.atmos-chem-phys.net/7/1947/2007/acp-7-1947-2007.html http://www.atmos-chem-phys.net/7/1947/2007/acp-7-1947-2007.pdf 1947 1960 2007-04-18 Observations of total peroxy nitrates and aldehydes: measurement interpretation and inference of OH radical concentrations P. A. Cleary P. J. Wooldridge D. B. Millet M. McKay A. H. Goldstein R. C. Cohen cohen@cchem.berkeley.edu Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA Department of Environmental Science, Policy and Management, University of California, Berkeley, Berkeley, CA 94720, USA Department of Earth and Planetary Science, University of California, Berkeley, Berkeley, CA 94720, USA Environment Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA now at: Department of Chemistry, University of Pennsylvania, 231 S. 34th St, Philadelphia, PA 19104, USA now at: Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA We describe measurements of total peroxy nitrates (ΣPNs), NO₂, O₃ and several aldehydes at Granite Bay, California, during the Chemistry and Transport of the Sacramento Urban Plume-2001 (CATSUP 2001) campaign, from 19 July–16 September 2001. We observed a strong photochemically driven variation of ΣPNs during the day with the median of 1.2 ppb at noon. 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