HOx chemistry during INTEX-A 2004

Observation, model calculation, and comparison with previous studies

Xinrong Ren, Jennifer R. Olson, J. H. Crawford, William Henry Brune, Jingqiu Mao, Robert B. Long, Zhong Chen, Gao Chen, Melody A. Avery, Glen W. Sachse, John D. Barrick, Glenn S. Diskin, L. Greg Huey, Alan Fried, Ronald C. Cohen, Brian Heikes, Paul O. Wennberg, Hanwant B. Singh, Donald R. Blake, Richard E. Shetter

Research output: Contribution to journalArticle

120 Citations (Scopus)

Abstract

OH and HO2 were measured with the Airborne Tropospheric Hydrogen Oxides Sensor (ATHOS) as part of a large measurement suite from the NASA DC-8 aircraft during the Intercontinental Chemical Transport Experiment-A (INTEX-A). This mission, which was conducted mainly over North America and the western Atlantic Ocean in summer 2004, was an excellent test of atmospheric oxidation chemistry. The HOx results from INTEX-A are compared to those from previous campaigns and to results for other related measurements from. INTEX-A. Throughout the troposphere, observed OH was generally 0.95 of modeled OH; below 8 km, observed HO2 was generally 1.20 of modeled HO2. This observed-to-modeled comparison is similar to that for TRACE-P, another midlatitude study for which the median observed-to-modeled ratio was 1.08 for OH and 1.34 for HO2, and to that for PEM-TB, a tropical study for which the median observed-to-modeled ratio was 1.17 for OH and 0.97 for HO2. HO2 behavior above 8 km was markedly different. The observed-to-modeled HO2 ratio increased from ∼1.2 at 8 km to ∼3 at 11 km with the observed-to-modeled ratio correlating with NO. Above 8 km, the observed-to-modeled HO2 and observed NO were both considerably greater than observations from previous campaigns. In addition, the observed-to-modeled HO2/OH, which is sensitive to cycling reactions between OH and HO2, increased from ∼1.5 at 8 km to almost 3.5 at 11 km. These discrepancies suggest a large unknown HOx source and additional reactants that cycle HOx from OH to HO2. In the continental planetary boundary layer, the observed-to-modeled OH ratio increased from 1 when isoprene was less than 0.1 ppbv to over 4 when isoprene was greater than 2 ppbv, suggesting that forests throughout the United States are emitting unknown HOx sources. Progress in resolving these discrepancies requires a focused research activity devoted to further examination of possible unknown OH sinks and HOx sources.

Original languageEnglish (US)
Article numberD05310
JournalJournal of Geophysical Research Atmospheres
Volume113
Issue number5
DOIs
StatePublished - Mar 16 2008

Fingerprint

isoprene
chemistry
Troposphere
aircraft
DC 8 aircraft
Atlantic Ocean
hydrogen
planetary boundary layer
sensors (equipment)
oxides
NASA
troposphere
Boundary layers
cycles
boundary layer
experiment
Experiments
temperate regions
Aircraft
oxide

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

Ren, Xinrong ; Olson, Jennifer R. ; Crawford, J. H. ; Brune, William Henry ; Mao, Jingqiu ; Long, Robert B. ; Chen, Zhong ; Chen, Gao ; Avery, Melody A. ; Sachse, Glen W. ; Barrick, John D. ; Diskin, Glenn S. ; Huey, L. Greg ; Fried, Alan ; Cohen, Ronald C. ; Heikes, Brian ; Wennberg, Paul O. ; Singh, Hanwant B. ; Blake, Donald R. ; Shetter, Richard E. / HOx chemistry during INTEX-A 2004 : Observation, model calculation, and comparison with previous studies. In: Journal of Geophysical Research Atmospheres. 2008 ; Vol. 113, No. 5.
@article{77000ef86c384c88b1f546a1066eacb6,
title = "HOx chemistry during INTEX-A 2004: Observation, model calculation, and comparison with previous studies",
abstract = "OH and HO2 were measured with the Airborne Tropospheric Hydrogen Oxides Sensor (ATHOS) as part of a large measurement suite from the NASA DC-8 aircraft during the Intercontinental Chemical Transport Experiment-A (INTEX-A). This mission, which was conducted mainly over North America and the western Atlantic Ocean in summer 2004, was an excellent test of atmospheric oxidation chemistry. The HOx results from INTEX-A are compared to those from previous campaigns and to results for other related measurements from. INTEX-A. Throughout the troposphere, observed OH was generally 0.95 of modeled OH; below 8 km, observed HO2 was generally 1.20 of modeled HO2. This observed-to-modeled comparison is similar to that for TRACE-P, another midlatitude study for which the median observed-to-modeled ratio was 1.08 for OH and 1.34 for HO2, and to that for PEM-TB, a tropical study for which the median observed-to-modeled ratio was 1.17 for OH and 0.97 for HO2. HO2 behavior above 8 km was markedly different. The observed-to-modeled HO2 ratio increased from ∼1.2 at 8 km to ∼3 at 11 km with the observed-to-modeled ratio correlating with NO. Above 8 km, the observed-to-modeled HO2 and observed NO were both considerably greater than observations from previous campaigns. In addition, the observed-to-modeled HO2/OH, which is sensitive to cycling reactions between OH and HO2, increased from ∼1.5 at 8 km to almost 3.5 at 11 km. These discrepancies suggest a large unknown HOx source and additional reactants that cycle HOx from OH to HO2. In the continental planetary boundary layer, the observed-to-modeled OH ratio increased from 1 when isoprene was less than 0.1 ppbv to over 4 when isoprene was greater than 2 ppbv, suggesting that forests throughout the United States are emitting unknown HOx sources. Progress in resolving these discrepancies requires a focused research activity devoted to further examination of possible unknown OH sinks and HOx sources.",
author = "Xinrong Ren and Olson, {Jennifer R.} and Crawford, {J. H.} and Brune, {William Henry} and Jingqiu Mao and Long, {Robert B.} and Zhong Chen and Gao Chen and Avery, {Melody A.} and Sachse, {Glen W.} and Barrick, {John D.} and Diskin, {Glenn S.} and Huey, {L. Greg} and Alan Fried and Cohen, {Ronald C.} and Brian Heikes and Wennberg, {Paul O.} and Singh, {Hanwant B.} and Blake, {Donald R.} and Shetter, {Richard E.}",
year = "2008",
month = "3",
day = "16",
doi = "10.1029/2007JD009166",
language = "English (US)",
volume = "113",
journal = "Journal of Geophysical Research",
issn = "0148-0227",
publisher = "American Geophysical Union",
number = "5",

}

Ren, X, Olson, JR, Crawford, JH, Brune, WH, Mao, J, Long, RB, Chen, Z, Chen, G, Avery, MA, Sachse, GW, Barrick, JD, Diskin, GS, Huey, LG, Fried, A, Cohen, RC, Heikes, B, Wennberg, PO, Singh, HB, Blake, DR & Shetter, RE 2008, 'HOx chemistry during INTEX-A 2004: Observation, model calculation, and comparison with previous studies', Journal of Geophysical Research Atmospheres, vol. 113, no. 5, D05310. https://doi.org/10.1029/2007JD009166

HOx chemistry during INTEX-A 2004 : Observation, model calculation, and comparison with previous studies. / Ren, Xinrong; Olson, Jennifer R.; Crawford, J. H.; Brune, William Henry; Mao, Jingqiu; Long, Robert B.; Chen, Zhong; Chen, Gao; Avery, Melody A.; Sachse, Glen W.; Barrick, John D.; Diskin, Glenn S.; Huey, L. Greg; Fried, Alan; Cohen, Ronald C.; Heikes, Brian; Wennberg, Paul O.; Singh, Hanwant B.; Blake, Donald R.; Shetter, Richard E.

In: Journal of Geophysical Research Atmospheres, Vol. 113, No. 5, D05310, 16.03.2008.

Research output: Contribution to journalArticle

TY - JOUR

T1 - HOx chemistry during INTEX-A 2004

T2 - Observation, model calculation, and comparison with previous studies

AU - Ren, Xinrong

AU - Olson, Jennifer R.

AU - Crawford, J. H.

AU - Brune, William Henry

AU - Mao, Jingqiu

AU - Long, Robert B.

AU - Chen, Zhong

AU - Chen, Gao

AU - Avery, Melody A.

AU - Sachse, Glen W.

AU - Barrick, John D.

AU - Diskin, Glenn S.

AU - Huey, L. Greg

AU - Fried, Alan

AU - Cohen, Ronald C.

AU - Heikes, Brian

AU - Wennberg, Paul O.

AU - Singh, Hanwant B.

AU - Blake, Donald R.

AU - Shetter, Richard E.

PY - 2008/3/16

Y1 - 2008/3/16

N2 - OH and HO2 were measured with the Airborne Tropospheric Hydrogen Oxides Sensor (ATHOS) as part of a large measurement suite from the NASA DC-8 aircraft during the Intercontinental Chemical Transport Experiment-A (INTEX-A). This mission, which was conducted mainly over North America and the western Atlantic Ocean in summer 2004, was an excellent test of atmospheric oxidation chemistry. The HOx results from INTEX-A are compared to those from previous campaigns and to results for other related measurements from. INTEX-A. Throughout the troposphere, observed OH was generally 0.95 of modeled OH; below 8 km, observed HO2 was generally 1.20 of modeled HO2. This observed-to-modeled comparison is similar to that for TRACE-P, another midlatitude study for which the median observed-to-modeled ratio was 1.08 for OH and 1.34 for HO2, and to that for PEM-TB, a tropical study for which the median observed-to-modeled ratio was 1.17 for OH and 0.97 for HO2. HO2 behavior above 8 km was markedly different. The observed-to-modeled HO2 ratio increased from ∼1.2 at 8 km to ∼3 at 11 km with the observed-to-modeled ratio correlating with NO. Above 8 km, the observed-to-modeled HO2 and observed NO were both considerably greater than observations from previous campaigns. In addition, the observed-to-modeled HO2/OH, which is sensitive to cycling reactions between OH and HO2, increased from ∼1.5 at 8 km to almost 3.5 at 11 km. These discrepancies suggest a large unknown HOx source and additional reactants that cycle HOx from OH to HO2. In the continental planetary boundary layer, the observed-to-modeled OH ratio increased from 1 when isoprene was less than 0.1 ppbv to over 4 when isoprene was greater than 2 ppbv, suggesting that forests throughout the United States are emitting unknown HOx sources. Progress in resolving these discrepancies requires a focused research activity devoted to further examination of possible unknown OH sinks and HOx sources.

AB - OH and HO2 were measured with the Airborne Tropospheric Hydrogen Oxides Sensor (ATHOS) as part of a large measurement suite from the NASA DC-8 aircraft during the Intercontinental Chemical Transport Experiment-A (INTEX-A). This mission, which was conducted mainly over North America and the western Atlantic Ocean in summer 2004, was an excellent test of atmospheric oxidation chemistry. The HOx results from INTEX-A are compared to those from previous campaigns and to results for other related measurements from. INTEX-A. Throughout the troposphere, observed OH was generally 0.95 of modeled OH; below 8 km, observed HO2 was generally 1.20 of modeled HO2. This observed-to-modeled comparison is similar to that for TRACE-P, another midlatitude study for which the median observed-to-modeled ratio was 1.08 for OH and 1.34 for HO2, and to that for PEM-TB, a tropical study for which the median observed-to-modeled ratio was 1.17 for OH and 0.97 for HO2. HO2 behavior above 8 km was markedly different. The observed-to-modeled HO2 ratio increased from ∼1.2 at 8 km to ∼3 at 11 km with the observed-to-modeled ratio correlating with NO. Above 8 km, the observed-to-modeled HO2 and observed NO were both considerably greater than observations from previous campaigns. In addition, the observed-to-modeled HO2/OH, which is sensitive to cycling reactions between OH and HO2, increased from ∼1.5 at 8 km to almost 3.5 at 11 km. These discrepancies suggest a large unknown HOx source and additional reactants that cycle HOx from OH to HO2. In the continental planetary boundary layer, the observed-to-modeled OH ratio increased from 1 when isoprene was less than 0.1 ppbv to over 4 when isoprene was greater than 2 ppbv, suggesting that forests throughout the United States are emitting unknown HOx sources. Progress in resolving these discrepancies requires a focused research activity devoted to further examination of possible unknown OH sinks and HOx sources.

UR - http://www.scopus.com/inward/record.url?scp=41449109345&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=41449109345&partnerID=8YFLogxK

U2 - 10.1029/2007JD009166

DO - 10.1029/2007JD009166

M3 - Article

VL - 113

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

SN - 0148-0227

IS - 5

M1 - D05310

ER -