title: Missing OH reactivity in a forest: evidence for unknown reactive biogenic VOCs.
abstract: Forest emissions of biogenic volatile organic compounds (BVOCs), such as isoprene and other terpenes, play a role in the production of tropospheric ozone and aerosols. In a northern Michigan forest, the direct measurement of total OH reactivity, which is the inverse of the OH lifetime, was significantly greater than expected. The difference between measured and expected OH reactivity, called the missing OH reactivity, increased with temperature, as did emission rates for terpenes and other BVOCs. These measurements are consistent with the hypothesis that unknown reactive BVOCs, perhaps terpenes, provide the missing OH reactivity.
authors.affiliation: Department of Meteorology, Pennsylvania State University, University Park, PA 16802, USA. piero.dicarlo@aquila.infn.it
authors.forename: Piero
authors.initials: P
authors.lastname: Di Carlo
authors.forename: William H
authors.initials: WH
authors.lastname: Brune
authors.forename: Monica
authors.initials: M
authors.lastname: Martinez
authors.forename: Hartwig
authors.initials: H
authors.lastname: Harder
authors.forename: Robert
authors.initials: R
authors.lastname: Lesher
authors.forename: Xinrong
authors.initials: X
authors.lastname: Ren
authors.forename: Troy
authors.initials: T
authors.lastname: Thornberry
authors.forename: Mary Anne
authors.initials: MA
authors.lastname: Carroll
authors.forename: Valerie
authors.initials: V
authors.lastname: Young
authors.forename: Paul B
authors.initials: PB
authors.lastname: Shepson
authors.forename: Daniel
authors.initials: D
authors.lastname: Riemer
authors.forename: Eric
authors.initials: E
authors.lastname: Apel
authors.forename: Colleen
authors.initials: C
authors.lastname: Campbell
mesh_terms: D000336:Aerosols; D001272:Atmosphere; D002070:Butadienes / Q000032:analysis; D045782:Hemiterpenes / Q000032:analysis; D017665:Hydroxyl Radical / Q000032:analysis / Q000737:chemistry*; D008824:Michigan; D009930:Organic Chemicals / Q000032:analysis / Q000737:chemistry*; D010126:Ozone / Q000032:analysis / Q000737:chemistry; D010420:Pentanes / Q000032:analysis; D013472:Sunlight; D013696:Temperature; D013729:Terpenes; D014197:Trees
chemical_list: D000336:Aerosols; D002070:Butadienes; D045782:Hemiterpenes; D009930:Organic Chemicals; D010420:Pentanes; D013729:Terpenes; C005059:isoprene; D017665:Hydroxyl Radical; D010126:Ozone