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 significa...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2004-04, Vol.304 (5671), p.722-725
Main Authors: Di Carlo, Piero, Brune, William H., Martinez, Monica, Harder, Hartwig, Lesher, Robert, Ren, Xinrong, Thornberry, Troy, Carroll, Mary Anne, Young, Valerie, Shepson, Paul B., Riemer, Daniel, Apel, Eric, Campbell, Colleen
Format: Article
Language:English
Subjects:
Aerosols
Atmosphere
Atmospheric chemistry
Atmospherics
Boreal forests
Butadienes - analysis
Chemical composition and interactions. Ionic interactions and processes
Chemical properties
Climate
Earth, ocean, space
Emissions
Environmental aspects
Evidence
Exact sciences and technology
External geophysics
Forests
Forests and forestry
Greenhouse effect
Hemiterpenes - analysis
Hydroxides
Hydroxyl Radical - analysis
Hydroxyl Radical - chemistry
Meteorology
Michigan
Monoterpenes
Organic Chemicals - analysis
Organic Chemicals - chemistry
Organic Chemistry
Ozone - analysis
Ozone - chemistry
Pentanes - analysis
Pollutant emissions
Prophets
Reactivity
Sunlight
Temperature
Temperature dependence
Terpenes
Trees
United States
VOCs
Volatile organic compounds
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Description
Summary: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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1094392