Loss of isoprene and sources of nighttime OH radicals at a rural site in the United States: Results from photochemical models

Sanford Sillman, Mary Anne Carroll, Troy Thornberry, Brian K. Lamb, Hal Westberg, William H. Brune, Ian Faloona, David Tan, Paul B. Shepson, Ann Louise Sumner, Donald R. Hastie, Christian M. Mihele, Eric C. Apel, D. D. Riemer, Rod G. Zika

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

A one-dimensional Lagrangian model for atmospheric transport and photochemistry has been developed and used to interpret measurements made at Pellston, Michigan, during the summer of 1998. The model represents a moving vertical column of air with vertical resolution of 25 m near the ground. Calculations have been performed for a series of trajectories, with representation of emissions, vertical mixing, and photochemistry for a 3-day period ending with the arrival of the air column at Pellston. Results have been used to identify causes of the observed decrease in isoprene at night, to investigate causes of high nighttime OH. Significant OH can be generated at night by terpenes if it is assumed that some fast-reacting monoterpenes are emitted at rates comparable to inventory emissions for terpenes. However, this nighttime OH is confined to a shallow surface layer (0-25 m) and has little impact on nighttime chemistry. The observed decrease in isoprene at night can be reproduced in models with low OH, and is attributed primarily to vertical dilution. There is also evidence that transport from Lake Michigan contributes to low nighttime isoprene at Pellston. Model results compare well with measured isoprene, NOx, and with isoprene vertical profiles. Significant model-measurement discrepancies are found for OH, HO2, methylvinylketone, and formaldehyde.

Original languageEnglish (US)
Pages (from-to)2-1 - 2-14
JournalJournal of Geophysical Research Atmospheres
Volume107
Issue number5-6
StatePublished - Mar 27 2002

Fingerprint

isoprene
terpenes
night
terpene
photochemistry
Photochemical reactions
Terpenes
terpenoids
photochemical reactions
Lake Michigan
air
Monoterpenes
causes
monoterpene
atmospheric transport
emission inventory
vertical mixing
Air
formaldehyde
monoterpenoids

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

Sillman, S., Carroll, M. A., Thornberry, T., Lamb, B. K., Westberg, H., Brune, W. H., ... Zika, R. G. (2002). Loss of isoprene and sources of nighttime OH radicals at a rural site in the United States: Results from photochemical models. Journal of Geophysical Research Atmospheres, 107(5-6), 2-1 - 2-14.
Sillman, Sanford ; Carroll, Mary Anne ; Thornberry, Troy ; Lamb, Brian K. ; Westberg, Hal ; Brune, William H. ; Faloona, Ian ; Tan, David ; Shepson, Paul B. ; Sumner, Ann Louise ; Hastie, Donald R. ; Mihele, Christian M. ; Apel, Eric C. ; Riemer, D. D. ; Zika, Rod G. / Loss of isoprene and sources of nighttime OH radicals at a rural site in the United States : Results from photochemical models. In: Journal of Geophysical Research Atmospheres. 2002 ; Vol. 107, No. 5-6. pp. 2-1 - 2-14.
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abstract = "A one-dimensional Lagrangian model for atmospheric transport and photochemistry has been developed and used to interpret measurements made at Pellston, Michigan, during the summer of 1998. The model represents a moving vertical column of air with vertical resolution of 25 m near the ground. Calculations have been performed for a series of trajectories, with representation of emissions, vertical mixing, and photochemistry for a 3-day period ending with the arrival of the air column at Pellston. Results have been used to identify causes of the observed decrease in isoprene at night, to investigate causes of high nighttime OH. Significant OH can be generated at night by terpenes if it is assumed that some fast-reacting monoterpenes are emitted at rates comparable to inventory emissions for terpenes. However, this nighttime OH is confined to a shallow surface layer (0-25 m) and has little impact on nighttime chemistry. The observed decrease in isoprene at night can be reproduced in models with low OH, and is attributed primarily to vertical dilution. There is also evidence that transport from Lake Michigan contributes to low nighttime isoprene at Pellston. Model results compare well with measured isoprene, NOx, and with isoprene vertical profiles. Significant model-measurement discrepancies are found for OH, HO2, methylvinylketone, and formaldehyde.",
author = "Sanford Sillman and Carroll, {Mary Anne} and Troy Thornberry and Lamb, {Brian K.} and Hal Westberg and Brune, {William H.} and Ian Faloona and David Tan and Shepson, {Paul B.} and Sumner, {Ann Louise} and Hastie, {Donald R.} and Mihele, {Christian M.} and Apel, {Eric C.} and Riemer, {D. D.} and Zika, {Rod G.}",
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Sillman, S, Carroll, MA, Thornberry, T, Lamb, BK, Westberg, H, Brune, WH, Faloona, I, Tan, D, Shepson, PB, Sumner, AL, Hastie, DR, Mihele, CM, Apel, EC, Riemer, DD & Zika, RG 2002, 'Loss of isoprene and sources of nighttime OH radicals at a rural site in the United States: Results from photochemical models', Journal of Geophysical Research Atmospheres, vol. 107, no. 5-6, pp. 2-1 - 2-14.

Loss of isoprene and sources of nighttime OH radicals at a rural site in the United States : Results from photochemical models. / Sillman, Sanford; Carroll, Mary Anne; Thornberry, Troy; Lamb, Brian K.; Westberg, Hal; Brune, William H.; Faloona, Ian; Tan, David; Shepson, Paul B.; Sumner, Ann Louise; Hastie, Donald R.; Mihele, Christian M.; Apel, Eric C.; Riemer, D. D.; Zika, Rod G.

In: Journal of Geophysical Research Atmospheres, Vol. 107, No. 5-6, 27.03.2002, p. 2-1 - 2-14.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Loss of isoprene and sources of nighttime OH radicals at a rural site in the United States

T2 - Results from photochemical models

AU - Sillman, Sanford

AU - Carroll, Mary Anne

AU - Thornberry, Troy

AU - Lamb, Brian K.

AU - Westberg, Hal

AU - Brune, William H.

AU - Faloona, Ian

AU - Tan, David

AU - Shepson, Paul B.

AU - Sumner, Ann Louise

AU - Hastie, Donald R.

AU - Mihele, Christian M.

AU - Apel, Eric C.

AU - Riemer, D. D.

AU - Zika, Rod G.

PY - 2002/3/27

Y1 - 2002/3/27

N2 - A one-dimensional Lagrangian model for atmospheric transport and photochemistry has been developed and used to interpret measurements made at Pellston, Michigan, during the summer of 1998. The model represents a moving vertical column of air with vertical resolution of 25 m near the ground. Calculations have been performed for a series of trajectories, with representation of emissions, vertical mixing, and photochemistry for a 3-day period ending with the arrival of the air column at Pellston. Results have been used to identify causes of the observed decrease in isoprene at night, to investigate causes of high nighttime OH. Significant OH can be generated at night by terpenes if it is assumed that some fast-reacting monoterpenes are emitted at rates comparable to inventory emissions for terpenes. However, this nighttime OH is confined to a shallow surface layer (0-25 m) and has little impact on nighttime chemistry. The observed decrease in isoprene at night can be reproduced in models with low OH, and is attributed primarily to vertical dilution. There is also evidence that transport from Lake Michigan contributes to low nighttime isoprene at Pellston. Model results compare well with measured isoprene, NOx, and with isoprene vertical profiles. Significant model-measurement discrepancies are found for OH, HO2, methylvinylketone, and formaldehyde.

AB - A one-dimensional Lagrangian model for atmospheric transport and photochemistry has been developed and used to interpret measurements made at Pellston, Michigan, during the summer of 1998. The model represents a moving vertical column of air with vertical resolution of 25 m near the ground. Calculations have been performed for a series of trajectories, with representation of emissions, vertical mixing, and photochemistry for a 3-day period ending with the arrival of the air column at Pellston. Results have been used to identify causes of the observed decrease in isoprene at night, to investigate causes of high nighttime OH. Significant OH can be generated at night by terpenes if it is assumed that some fast-reacting monoterpenes are emitted at rates comparable to inventory emissions for terpenes. However, this nighttime OH is confined to a shallow surface layer (0-25 m) and has little impact on nighttime chemistry. The observed decrease in isoprene at night can be reproduced in models with low OH, and is attributed primarily to vertical dilution. There is also evidence that transport from Lake Michigan contributes to low nighttime isoprene at Pellston. Model results compare well with measured isoprene, NOx, and with isoprene vertical profiles. Significant model-measurement discrepancies are found for OH, HO2, methylvinylketone, and formaldehyde.

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