A study of formaldehyde chemistry above a forest canopy

Ann Louise Sumner, Paul B. Shepson, Tara L. Couch, Troy Thornberry, Mary Anne Carroll, Sandy Sillman, Margaret Pippin, Steven Bertman, David Tan, Ian Faloona, William Brune, Valerie Young, Owen Cooper, Jennie Moody, William Stockwell

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Gas-phase formaldehyde (HCHO) was measured at a mixed deciduous/coniferous forest site as a part of the PROPHET 1998 summer field intensive. For the measurement period of July 11 through August 20, 1998, formaldehyde mixing ratios ranged from 0.5 to 12 ppb at a height ∼10 m above the forest canopy, with the highest concentrations observed in southeasterly air masses. Concentrations varied on average from a mid-afternoon maximum influenced by photochemical production of 4.0 ppb, to a late night minimum of 2.2 ppb, probably resulting from dry depositional loss. An analysis of local HCHO sources revealed that isoprene was the most important of the measured formaldehyde precursors, contributing, on average, 82% of the calculated midday HCHO production rate. We calculate that the nighttime HCHO dry deposition velocity is 2.6 times that of ozone, or approximately 0.65 cm/s. In the daytime, photolysis, dry deposition, and reaction with hydroxyl radical (OH) are roughly equally important as loss processes. Explicit calculations of HCHO chemical behavior highlighted the probable importance of transport and surface deposition to understanding the diel behavior of formaldehyde.

Original languageEnglish (US)
Article number2000JD900761
Pages (from-to)24387-24405
Number of pages19
JournalJournal of Geophysical Research Atmospheres
Volume106
Issue numberD20
DOIs
StatePublished - Oct 27 2001

Fingerprint

canopies
forest canopy
formaldehyde
Formaldehyde
chemistry
dry deposition
deposition velocity
isoprene
Ozone
air masses
photolysis
Photolysis
hydroxyl radicals
daytime
hydroxyl radical
mixing ratios
coniferous forest
deciduous forests
deciduous forest
ozone

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Sumner, A. L., Shepson, P. B., Couch, T. L., Thornberry, T., Carroll, M. A., Sillman, S., ... Stockwell, W. (2001). A study of formaldehyde chemistry above a forest canopy. Journal of Geophysical Research Atmospheres, 106(D20), 24387-24405. [2000JD900761]. https://doi.org/10.1029/2000JD900761
Sumner, Ann Louise ; Shepson, Paul B. ; Couch, Tara L. ; Thornberry, Troy ; Carroll, Mary Anne ; Sillman, Sandy ; Pippin, Margaret ; Bertman, Steven ; Tan, David ; Faloona, Ian ; Brune, William ; Young, Valerie ; Cooper, Owen ; Moody, Jennie ; Stockwell, William. / A study of formaldehyde chemistry above a forest canopy. In: Journal of Geophysical Research Atmospheres. 2001 ; Vol. 106, No. D20. pp. 24387-24405.
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Sumner, AL, Shepson, PB, Couch, TL, Thornberry, T, Carroll, MA, Sillman, S, Pippin, M, Bertman, S, Tan, D, Faloona, I, Brune, W, Young, V, Cooper, O, Moody, J & Stockwell, W 2001, 'A study of formaldehyde chemistry above a forest canopy', Journal of Geophysical Research Atmospheres, vol. 106, no. D20, 2000JD900761, pp. 24387-24405. https://doi.org/10.1029/2000JD900761

A study of formaldehyde chemistry above a forest canopy. / Sumner, Ann Louise; Shepson, Paul B.; Couch, Tara L.; Thornberry, Troy; Carroll, Mary Anne; Sillman, Sandy; Pippin, Margaret; Bertman, Steven; Tan, David; Faloona, Ian; Brune, William; Young, Valerie; Cooper, Owen; Moody, Jennie; Stockwell, William.

In: Journal of Geophysical Research Atmospheres, Vol. 106, No. D20, 2000JD900761, 27.10.2001, p. 24387-24405.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A study of formaldehyde chemistry above a forest canopy

AU - Sumner, Ann Louise

AU - Shepson, Paul B.

AU - Couch, Tara L.

AU - Thornberry, Troy

AU - Carroll, Mary Anne

AU - Sillman, Sandy

AU - Pippin, Margaret

AU - Bertman, Steven

AU - Tan, David

AU - Faloona, Ian

AU - Brune, William

AU - Young, Valerie

AU - Cooper, Owen

AU - Moody, Jennie

AU - Stockwell, William

PY - 2001/10/27

Y1 - 2001/10/27

N2 - Gas-phase formaldehyde (HCHO) was measured at a mixed deciduous/coniferous forest site as a part of the PROPHET 1998 summer field intensive. For the measurement period of July 11 through August 20, 1998, formaldehyde mixing ratios ranged from 0.5 to 12 ppb at a height ∼10 m above the forest canopy, with the highest concentrations observed in southeasterly air masses. Concentrations varied on average from a mid-afternoon maximum influenced by photochemical production of 4.0 ppb, to a late night minimum of 2.2 ppb, probably resulting from dry depositional loss. An analysis of local HCHO sources revealed that isoprene was the most important of the measured formaldehyde precursors, contributing, on average, 82% of the calculated midday HCHO production rate. We calculate that the nighttime HCHO dry deposition velocity is 2.6 times that of ozone, or approximately 0.65 cm/s. In the daytime, photolysis, dry deposition, and reaction with hydroxyl radical (OH) are roughly equally important as loss processes. Explicit calculations of HCHO chemical behavior highlighted the probable importance of transport and surface deposition to understanding the diel behavior of formaldehyde.

AB - Gas-phase formaldehyde (HCHO) was measured at a mixed deciduous/coniferous forest site as a part of the PROPHET 1998 summer field intensive. For the measurement period of July 11 through August 20, 1998, formaldehyde mixing ratios ranged from 0.5 to 12 ppb at a height ∼10 m above the forest canopy, with the highest concentrations observed in southeasterly air masses. Concentrations varied on average from a mid-afternoon maximum influenced by photochemical production of 4.0 ppb, to a late night minimum of 2.2 ppb, probably resulting from dry depositional loss. An analysis of local HCHO sources revealed that isoprene was the most important of the measured formaldehyde precursors, contributing, on average, 82% of the calculated midday HCHO production rate. We calculate that the nighttime HCHO dry deposition velocity is 2.6 times that of ozone, or approximately 0.65 cm/s. In the daytime, photolysis, dry deposition, and reaction with hydroxyl radical (OH) are roughly equally important as loss processes. Explicit calculations of HCHO chemical behavior highlighted the probable importance of transport and surface deposition to understanding the diel behavior of formaldehyde.

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Sumner AL, Shepson PB, Couch TL, Thornberry T, Carroll MA, Sillman S et al. A study of formaldehyde chemistry above a forest canopy. Journal of Geophysical Research Atmospheres. 2001 Oct 27;106(D20):24387-24405. 2000JD900761. https://doi.org/10.1029/2000JD900761