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High Upward Fluxes of Formic Acid from a Boreal Forest CanopyEddy covariance fluxes of formic acid, HCOOH, were measured over a boreal forest canopy in spring/summer 2014. The HCOOH fluxes were bidirectional but mostly upward during daytime, in contrast to studies elsewhere that reported mostly downward fluxes. Downward flux episodes were explained well by modeled dry deposition rates. The sum of net observed flux and modeled dry deposition yields an upward gross flux of HCOOH, which could not be quantitatively explained by literature estimates of direct vegetative soil emissions nor by efficient chemical production from other volatile organic compounds, suggesting missing or greatly underestimated HCOOH sources in the boreal ecosystem. We implemented a vegetative HCOOH source into the GEOS-Chem chemical transport model to match our derived gross flux and evaluated the updated model against airborne and spaceborne observations. Model biases in the boundary layer were substantially reduced based on this revised treatment, but biases in the free troposphere remain unexplained.
Document ID
20170010220
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Schobesberger, Siegfried
(Washington Univ. Seattle, WA, United States)
Lopez-Hilifiker, Felipe D.
(Washington Univ. Hospital Seattle, WA, United States)
Taipale, Ditte
(Helsinki Univ. Helsinki, Finland)
Millet, Dylan B.
(Minnesota Univ. Saint Paul, MN, United States)
D'Ambro, Emma L.
(Washington Univ. Washington, DC, United States)
Rantala, Pekka
(Helsinki Univ. Helsinki, Finland)
Mammarella, Ivan
(Helsinki Univ. Helsinki, Finland)
Zhou, Putian
(Helsinki Univ. Helsinki, Finland)
Wolfe, Glenn M.
(Maryland Univ. Baltimore County Baltimore, MD, United States)
Lee, Ben H.
(Washington Univ. Seattle, WA, United States)
Boy, Michael
(Helsinki Univ. Helsinki, Finland)
Thornton, J. A.
(Washington Univ. Seattle, WA, United States)
Date Acquired
October 19, 2017
Publication Date
September 14, 2016
Publication Information
Publication: Geophysical Research Letters
Volume: 43
Issue: 17
ISSN: 0094-8276
Subject Category
Geophysics
Report/Patent Number
GSFC-E-DAA-TN47288
Funding Number(s)
CONTRACT_GRANT: DE-SC0006867
CONTRACT_GRANT: NNX15AT34A
Distribution Limits
Public
Copyright
Other
Keywords
forest
atmospheric chemistry
formic acid
flu

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