Marine latitude/altitude OH distributions: Comparison of Pacific Ocean observations with models

D. Davis, G. Grodzinsky, G. Chen, J. Crawford, F. Eisele, L. Mauldin, D. Tanner, C. Cantrell, W. Brune, D. Tan, I. Faloona, B. Ridley, D. Montzka, J. Walega, F. Grahek, S. Sandholm, G. Sachse, S. Vay, B. Anderson, M. AveryB. Heikes, J. Snow, D. O'Sullivan, R. Shetter, B. Lefer, D. Blake, N. Blake, M. Carroll, Y. Wang

Research output: Contribution to journalReview article

15 Citations (Scopus)

Abstract

Reported here are tropical/subtropical Pacific basin OH observational data presented in a latitude/altitude geographical grid. They cover two seasons of the year (spring and fall) that reflect the timing of NASA's PEM-Tropics A (1996) and B (1999) field programs. Two different OH sensors were used to collect these data, and each instrument was mounted on a different aircraft platform (i.e., NASA's P-3B and DC-8). Collectively, these chemical snapshots of the central Pacific have revealed several interesting trends. Only modest decreases (factors of 2 to 3) were found in the levels of OH with increasing altitude (0-12 km). Similarly, only modest variations were found (factors of 1.5 to 3.5) when the data were examined as a function of latitude (30° N to 30° S). Using simultaneously recorded data for CO, O3, H2O, NO, and NMHCs, comparisons with current models were also carried out. For three out of four data subsets, the results revealed a high level of correspondence. On average, the box model results agreed with the observations within a factor of 1.5. The comparison with the three-dimensional model results was found to be only slightly worse. Overall, these results suggest that current model mechanisms capture the major photochemical processes controlling OH quite well and thus provide a reasonably good representation of OH levels for tropical marine environments. They also indicate that the two OH sensors employed during the PEM-Tropics B study generally saw similar OH levels when sampling a similar tropical marine environment. However, a modest altitude bias appears to exist between these instruments. More rigorous instrument intercomparison activity would therefore seem to be justified. Further comparisons of model predictions with observations are also recommended for nontropical marine environments as well as those involving highly elevated levels of reactive non-methane hydrocarbons.

Original languageEnglish (US)
Article number2001JD900141
Pages (from-to)32691-32707
Number of pages17
JournalJournal of Geophysical Research Atmospheres
Volume106
Issue numberD23
DOIs
StatePublished - Dec 16 2001

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Pacific Ocean
marine environments
marine environment
ocean
Tropics
tropical environment
tropical regions
sensors (equipment)
NASA
tropics
sensor
nonmethane hydrocarbon
aircraft
sensors
Sensors
three dimensional models
Carbon Monoxide
Hydrocarbons
set theory
boxes

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

Davis, D., Grodzinsky, G., Chen, G., Crawford, J., Eisele, F., Mauldin, L., ... Wang, Y. (2001). Marine latitude/altitude OH distributions: Comparison of Pacific Ocean observations with models. Journal of Geophysical Research Atmospheres, 106(D23), 32691-32707. [2001JD900141]. https://doi.org/10.1029/2001JD900141
Davis, D. ; Grodzinsky, G. ; Chen, G. ; Crawford, J. ; Eisele, F. ; Mauldin, L. ; Tanner, D. ; Cantrell, C. ; Brune, W. ; Tan, D. ; Faloona, I. ; Ridley, B. ; Montzka, D. ; Walega, J. ; Grahek, F. ; Sandholm, S. ; Sachse, G. ; Vay, S. ; Anderson, B. ; Avery, M. ; Heikes, B. ; Snow, J. ; O'Sullivan, D. ; Shetter, R. ; Lefer, B. ; Blake, D. ; Blake, N. ; Carroll, M. ; Wang, Y. / Marine latitude/altitude OH distributions : Comparison of Pacific Ocean observations with models. In: Journal of Geophysical Research Atmospheres. 2001 ; Vol. 106, No. D23. pp. 32691-32707.
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title = "Marine latitude/altitude OH distributions: Comparison of Pacific Ocean observations with models",
abstract = "Reported here are tropical/subtropical Pacific basin OH observational data presented in a latitude/altitude geographical grid. They cover two seasons of the year (spring and fall) that reflect the timing of NASA's PEM-Tropics A (1996) and B (1999) field programs. Two different OH sensors were used to collect these data, and each instrument was mounted on a different aircraft platform (i.e., NASA's P-3B and DC-8). Collectively, these chemical snapshots of the central Pacific have revealed several interesting trends. Only modest decreases (factors of 2 to 3) were found in the levels of OH with increasing altitude (0-12 km). Similarly, only modest variations were found (factors of 1.5 to 3.5) when the data were examined as a function of latitude (30° N to 30° S). Using simultaneously recorded data for CO, O3, H2O, NO, and NMHCs, comparisons with current models were also carried out. For three out of four data subsets, the results revealed a high level of correspondence. On average, the box model results agreed with the observations within a factor of 1.5. The comparison with the three-dimensional model results was found to be only slightly worse. Overall, these results suggest that current model mechanisms capture the major photochemical processes controlling OH quite well and thus provide a reasonably good representation of OH levels for tropical marine environments. They also indicate that the two OH sensors employed during the PEM-Tropics B study generally saw similar OH levels when sampling a similar tropical marine environment. However, a modest altitude bias appears to exist between these instruments. More rigorous instrument intercomparison activity would therefore seem to be justified. Further comparisons of model predictions with observations are also recommended for nontropical marine environments as well as those involving highly elevated levels of reactive non-methane hydrocarbons.",
author = "D. Davis and G. Grodzinsky and G. Chen and J. Crawford and F. Eisele and L. Mauldin and D. Tanner and C. Cantrell and W. Brune and D. Tan and I. Faloona and B. Ridley and D. Montzka and J. Walega and F. Grahek and S. Sandholm and G. Sachse and S. Vay and B. Anderson and M. Avery and B. Heikes and J. Snow and D. O'Sullivan and R. Shetter and B. Lefer and D. Blake and N. Blake and M. Carroll and Y. Wang",
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Davis, D, Grodzinsky, G, Chen, G, Crawford, J, Eisele, F, Mauldin, L, Tanner, D, Cantrell, C, Brune, W, Tan, D, Faloona, I, Ridley, B, Montzka, D, Walega, J, Grahek, F, Sandholm, S, Sachse, G, Vay, S, Anderson, B, Avery, M, Heikes, B, Snow, J, O'Sullivan, D, Shetter, R, Lefer, B, Blake, D, Blake, N, Carroll, M & Wang, Y 2001, 'Marine latitude/altitude OH distributions: Comparison of Pacific Ocean observations with models', Journal of Geophysical Research Atmospheres, vol. 106, no. D23, 2001JD900141, pp. 32691-32707. https://doi.org/10.1029/2001JD900141

Marine latitude/altitude OH distributions : Comparison of Pacific Ocean observations with models. / Davis, D.; Grodzinsky, G.; Chen, G.; Crawford, J.; Eisele, F.; Mauldin, L.; Tanner, D.; Cantrell, C.; Brune, W.; Tan, D.; Faloona, I.; Ridley, B.; Montzka, D.; Walega, J.; Grahek, F.; Sandholm, S.; Sachse, G.; Vay, S.; Anderson, B.; Avery, M.; Heikes, B.; Snow, J.; O'Sullivan, D.; Shetter, R.; Lefer, B.; Blake, D.; Blake, N.; Carroll, M.; Wang, Y.

In: Journal of Geophysical Research Atmospheres, Vol. 106, No. D23, 2001JD900141, 16.12.2001, p. 32691-32707.

Research output: Contribution to journalReview article

TY - JOUR

T1 - Marine latitude/altitude OH distributions

T2 - Comparison of Pacific Ocean observations with models

AU - Davis, D.

AU - Grodzinsky, G.

AU - Chen, G.

AU - Crawford, J.

AU - Eisele, F.

AU - Mauldin, L.

AU - Tanner, D.

AU - Cantrell, C.

AU - Brune, W.

AU - Tan, D.

AU - Faloona, I.

AU - Ridley, B.

AU - Montzka, D.

AU - Walega, J.

AU - Grahek, F.

AU - Sandholm, S.

AU - Sachse, G.

AU - Vay, S.

AU - Anderson, B.

AU - Avery, M.

AU - Heikes, B.

AU - Snow, J.

AU - O'Sullivan, D.

AU - Shetter, R.

AU - Lefer, B.

AU - Blake, D.

AU - Blake, N.

AU - Carroll, M.

AU - Wang, Y.

PY - 2001/12/16

Y1 - 2001/12/16

N2 - Reported here are tropical/subtropical Pacific basin OH observational data presented in a latitude/altitude geographical grid. They cover two seasons of the year (spring and fall) that reflect the timing of NASA's PEM-Tropics A (1996) and B (1999) field programs. Two different OH sensors were used to collect these data, and each instrument was mounted on a different aircraft platform (i.e., NASA's P-3B and DC-8). Collectively, these chemical snapshots of the central Pacific have revealed several interesting trends. Only modest decreases (factors of 2 to 3) were found in the levels of OH with increasing altitude (0-12 km). Similarly, only modest variations were found (factors of 1.5 to 3.5) when the data were examined as a function of latitude (30° N to 30° S). Using simultaneously recorded data for CO, O3, H2O, NO, and NMHCs, comparisons with current models were also carried out. For three out of four data subsets, the results revealed a high level of correspondence. On average, the box model results agreed with the observations within a factor of 1.5. The comparison with the three-dimensional model results was found to be only slightly worse. Overall, these results suggest that current model mechanisms capture the major photochemical processes controlling OH quite well and thus provide a reasonably good representation of OH levels for tropical marine environments. They also indicate that the two OH sensors employed during the PEM-Tropics B study generally saw similar OH levels when sampling a similar tropical marine environment. However, a modest altitude bias appears to exist between these instruments. More rigorous instrument intercomparison activity would therefore seem to be justified. Further comparisons of model predictions with observations are also recommended for nontropical marine environments as well as those involving highly elevated levels of reactive non-methane hydrocarbons.

AB - Reported here are tropical/subtropical Pacific basin OH observational data presented in a latitude/altitude geographical grid. They cover two seasons of the year (spring and fall) that reflect the timing of NASA's PEM-Tropics A (1996) and B (1999) field programs. Two different OH sensors were used to collect these data, and each instrument was mounted on a different aircraft platform (i.e., NASA's P-3B and DC-8). Collectively, these chemical snapshots of the central Pacific have revealed several interesting trends. Only modest decreases (factors of 2 to 3) were found in the levels of OH with increasing altitude (0-12 km). Similarly, only modest variations were found (factors of 1.5 to 3.5) when the data were examined as a function of latitude (30° N to 30° S). Using simultaneously recorded data for CO, O3, H2O, NO, and NMHCs, comparisons with current models were also carried out. For three out of four data subsets, the results revealed a high level of correspondence. On average, the box model results agreed with the observations within a factor of 1.5. The comparison with the three-dimensional model results was found to be only slightly worse. Overall, these results suggest that current model mechanisms capture the major photochemical processes controlling OH quite well and thus provide a reasonably good representation of OH levels for tropical marine environments. They also indicate that the two OH sensors employed during the PEM-Tropics B study generally saw similar OH levels when sampling a similar tropical marine environment. However, a modest altitude bias appears to exist between these instruments. More rigorous instrument intercomparison activity would therefore seem to be justified. Further comparisons of model predictions with observations are also recommended for nontropical marine environments as well as those involving highly elevated levels of reactive non-methane hydrocarbons.

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U2 - 10.1029/2001JD900141

DO - 10.1029/2001JD900141

M3 - Review article

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JO - Journal of Geophysical Research: Atmospheres

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SN - 2169-897X

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Davis D, Grodzinsky G, Chen G, Crawford J, Eisele F, Mauldin L et al. Marine latitude/altitude OH distributions: Comparison of Pacific Ocean observations with models. Journal of Geophysical Research Atmospheres. 2001 Dec 16;106(D23):32691-32707. 2001JD900141. https://doi.org/10.1029/2001JD900141