Missing OH reactivity in a forest: evidence for unknown reactive biogenic VOCs.
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.
Di Carlo
Piero
P
Department of Meteorology, Pennsylvania State University, University Park, PA 16802, USA. piero.dicarlo@aquila.infn.it
Brune
William H
WH
Martinez
Monica
M
Harder
Hartwig
H
Lesher
Robert
R
Ren
Xinrong
X
Thornberry
Troy
T
Carroll
Mary Anne
MA
Young
Valerie
V
Shepson
Paul B
PB
Riemer
Daniel
D
Apel
Eric
E
Campbell
Colleen
C
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
D000336:Aerosols; D002070:Butadienes; D045782:Hemiterpenes; D009930:Organic Chemicals; D010420:Pentanes; D013729:Terpenes; C005059:isoprene; D017665:Hydroxyl Radical; D010126:Ozone