High upward fluxes of formic acid from a boreal forest canopy

Schobesberger, Siegfried; Lopez-Hilfiker, Felipe D.; Taipale, Ditte; Millet, Dylan B.; D'Ambro, Emma L.; Rantala, Pekka; Mammarella, Ivan; Zhou, Putian; Wolfe, Glenn M.; Lee, Ben H.; Boy, Michael; Thornton, Joel A.

doi:10.1002/2016GL069599

Title: High upward fluxes of formic acid from a boreal forest canopy

Journal Article · Sun Aug 14 00:00:00 EDT 2016 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2016GL069599· OSTI ID:1392635

Schobesberger, Siegfried ^[1]; Lopez-Hilfiker, Felipe D. ^[2]; Taipale, Ditte ^[3]; Millet, Dylan B. ^[4]; D'Ambro, Emma L. ^[5]; Rantala, Pekka ^[6]; Mammarella, Ivan ^[6]; Zhou, Putian ^[6];

^[7]; Lee, Ben H. ^[2]; Boy, Michael ^[6]; Thornton, Joel A. ^[2]

Univ. of Washington, Seattle, WA (United States). Dept. of Atmospheric Sciences; Univ. of Helsinki (Finland). Dept. of Physics
Univ. of Washington, Seattle, WA (United States). Dept. of Atmospheric Sciences
Estonian Univ. of Life Sciences, Tartu (Estonia). Dept. of Plant Physiology; Univ. of Helsinki (Finland). Dept. of Forest Sciences
Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Soil, Water, and Climate
Univ. of Washington, Seattle, WA (United States). Dept. of Chemistry
Univ. of Helsinki (Finland). Dept. of Physics
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States). Atmospheric Chemistry and Dynamics Lab.; Univ. of Maryland, Baltimore, MD (United States). Joint Center for Earth Systems Technology

Abstract Eddy 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.

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Research Organization:: Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); European Commission (EU); National Science Foundation (NSF)

Grant/Contract Number:: SC0011791; SC0006867; DE‐SC0006867

OSTI ID:: 1392635

Alternate ID(s):: OSTI ID: 1402387

Journal Information:: Geophysical Research Letters, Vol. 43, Issue 17; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 28 works

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Title: High upward fluxes of formic acid from a boreal forest canopy

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