Observations of Hydrogen Peroxide (H2O2) and Methylhydroperoxide (CH3OOH) at Mt. Bachelor Observatory During the Spring-Summer 2007

Observations of hydrogen peroxide (H2O2) and methylhydroperoxide (CH3OOH) were made at Mt. Bachelor Observatory (MBO), Oregon, during the summer 2007. H2O2 and CH3OOH, primary HOx precursors, were measured in order to constrain the sources and sinks of mercury. Prior to constraining mercury observations, the relationship between peroxide levels and meteorological measurements at MBO were investigated. Ambient peroxides were collected using continuous flow glass scrubbing coils, then analyzed with enzyme fluorescence techniques. Prior to analysis, H2O2 was separated from organic peroxides using High Performance Liquid Chromatography with a C-18 column. Preliminary results show peroxide variability is linked to diurnal, wind direction, and local air quality changes. Local fires were present during the later portion of the intensive study and allowed extensive sampling of peroxides during biomass burning events.