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Title: Oxidation of Volatile Organic Compounds as the Major Source of Formic Acid in a Mixed Forest Canopy

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2018GL081526· OSTI ID:1499200
 [1]; ORCiD logo [1];  [1]; ORCiD logo [2];  [3];  [4]
  1. Department of Soil, Water, and ClimateUniversity of Minnesota, Twin Cities Saint Paul MN USA
  2. School of Public and Environmental AffairsIndiana University Bloomington IN USA, Department of ChemistryIndiana University Bloomington IN USA
  3. Department of ChemistryIndiana University Bloomington IN USA
  4. School of Public and Environmental AffairsIndiana University Bloomington IN USA

Formic acid (HCOOH) is among the most abundant carboxylic acids in the atmosphere, but its budget is poorly understood. We present eddy flux, vertical gradient, and soil chamber measurements from a mixed forest and apply the data to better constrain HCOOH source/sink pathways. While the cumulative above-canopy flux was downward, HCOOH exchange was bidirectional, with extended periods of net upward and downward flux. Net above-canopy fluxes were mostly upward during warmer/drier periods. The implied gross canopy HCOOH source corresponds to 3% and 38% of observed isoprene and monoterpene carbon emissions and is 15× underestimated in a state-of-science atmospheric model (GEOS-Chem). Gradient and soil chamber measurements identify the canopy layer as the controlling source of HCOOH or its precursors to the forest environment; below-canopy sources were minor. A correlation analysis using an ensemble of marker volatile organic compounds suggests that secondary formation, not direct emission, is the major source driving ambient HCOOH.

Research Organization:
Indiana Univ., Bloomington, IN (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
SC0014443; AGS‐1428257; AGS‐1148951; AGS‐1352375; NNX14AP89G
OSTI ID:
1499200
Alternate ID(s):
OSTI ID: 1499201; OSTI ID: 1612199
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Vol. 46 Journal Issue: 5; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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