Chemical composition of Asian continental outflow over the western Pacific

Results from Transport and Chemical Evolution over the Pacific (TRACE-P)

R. S. Russo, R. W. Talbot, J. E. Dibb, E. Scheuer, G. Seid, C. E. Jordan, H. E. Fuelberg, G. W. Sachse, M. A. Avery, S. A. Vay, D. R. Blake, N. J. Blake, Elliot L Atlas, A. Fried, S. T. Sandholm, D. Tan, H. B. Singh, J. Snow, B. G. Heikes

Research output: Contribution to journalArticle

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Abstract

We characterize the chemical composition of Asian continental outflow observed during the NASA Transport and Chemical Evolution over the Pacific (TRACE-P) mission during February-April 2001 in the western Pacific using data collected on the NASA DC-8 aircraft. A significant anthropogenic impact was present in the free troposphere and as far east as 150°E longitude reflecting rapid uplift and transport of continental emissions. Five-day backward trajectories were utilized to identify five principal Asian source regions of outflow: central, coastal, north-northwest (NNW), southeast (SE), and west-southwest (WSW . The maximum mixing ratios for several species, such as CO, C2Cl4, CH3Cl, and hydrocarbons, were more than a factor of 2 larger in the boundary layer of the central and coastal regions due to industrial activity in East Asia. CO was well correlated with C2H2, C2H6, C2Cl4, and CH3Cl at low altitudes in these two regions (r2 ∼ 0.77-0.97). The NNW, WSW, and SE regions were impacted by anthropogenic sources above the boundary layer presumably due to the longer transport distances of air masses to the western Pacific. Frontal and convective lifting of continental emissions was most likely responsible for the high altitude outflow in these three regions. Photochemical processing was influential in each source region resulting in enhanced mixing ratios of O3, PAN, HNO3, H2O2, and CH3OOH. The air masses encountered in all five regions were composed of a complex mixture of photochemically aged air with more recent emissions mixed into the outflow as indicated by enhanced hydrocarbon ratios (C2H2/CO ≥ 3 and C3H8/C2H6 ≥ 0.2). Combustion, industrial activities, and the burning of biofuels and biomass all contributed to the chemical composition of air masses from each source region as demonstrated by the use of C2H2, C2Cl4, and CH3Cl as atmospheric tracers. Mixing ratios of O3, CO, C2H2, C2H6, SO2, and C2Cl4 were compared for the TRACE-P and PEM-West B missions. In the more northern regions, O3, CO, and SO2 were higher at low altitudes during TRACE-P. In general, mixing ratios were fairly similar between the two missions in the southern regions. A comparison between CO/CO2, CO/CH4, C2H6/C3H8, NOx/SO2, and NOy/(SO2 + nss-SO4) ratios for the five source regions and for the 2000 Asian emissions summary showed very close agreement indicating that Asian emissions were well represented by the TRACE-P data and the emissions inventory.

Original languageEnglish (US)
JournalJournal of Geophysical Research C: Oceans
Volume108
Issue number20
StatePublished - Oct 27 2003
Externally publishedYes

Fingerprint

chemical evolution
Carbon Monoxide
chemical composition
outflow
mixing ratios
air masses
Chemical analysis
low altitude
mixing ratio
Hydrocarbons
Air
boundary layers
DC 8 aircraft
hydrocarbons
air mass
NASA
Boundary layers
polyacrylonitrile
high altitude
biomass

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Atmospheric Science
  • Geochemistry and Petrology
  • Geophysics
  • Oceanography
  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Chemical composition of Asian continental outflow over the western Pacific : Results from Transport and Chemical Evolution over the Pacific (TRACE-P). / Russo, R. S.; Talbot, R. W.; Dibb, J. E.; Scheuer, E.; Seid, G.; Jordan, C. E.; Fuelberg, H. E.; Sachse, G. W.; Avery, M. A.; Vay, S. A.; Blake, D. R.; Blake, N. J.; Atlas, Elliot L; Fried, A.; Sandholm, S. T.; Tan, D.; Singh, H. B.; Snow, J.; Heikes, B. G.

In: Journal of Geophysical Research C: Oceans, Vol. 108, No. 20, 27.10.2003.

Research output: Contribution to journalArticle

Russo, RS, Talbot, RW, Dibb, JE, Scheuer, E, Seid, G, Jordan, CE, Fuelberg, HE, Sachse, GW, Avery, MA, Vay, SA, Blake, DR, Blake, NJ, Atlas, EL, Fried, A, Sandholm, ST, Tan, D, Singh, HB, Snow, J & Heikes, BG 2003, 'Chemical composition of Asian continental outflow over the western Pacific: Results from Transport and Chemical Evolution over the Pacific (TRACE-P)', Journal of Geophysical Research C: Oceans, vol. 108, no. 20.
Russo, R. S. ; Talbot, R. W. ; Dibb, J. E. ; Scheuer, E. ; Seid, G. ; Jordan, C. E. ; Fuelberg, H. E. ; Sachse, G. W. ; Avery, M. A. ; Vay, S. A. ; Blake, D. R. ; Blake, N. J. ; Atlas, Elliot L ; Fried, A. ; Sandholm, S. T. ; Tan, D. ; Singh, H. B. ; Snow, J. ; Heikes, B. G. / Chemical composition of Asian continental outflow over the western Pacific : Results from Transport and Chemical Evolution over the Pacific (TRACE-P). In: Journal of Geophysical Research C: Oceans. 2003 ; Vol. 108, No. 20.
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T1 - Chemical composition of Asian continental outflow over the western Pacific

T2 - Results from Transport and Chemical Evolution over the Pacific (TRACE-P)

AU - Russo, R. S.

AU - Talbot, R. W.

AU - Dibb, J. E.

AU - Scheuer, E.

AU - Seid, G.

AU - Jordan, C. E.

AU - Fuelberg, H. E.

AU - Sachse, G. W.

AU - Avery, M. A.

AU - Vay, S. A.

AU - Blake, D. R.

AU - Blake, N. J.

AU - Atlas, Elliot L

AU - Fried, A.

AU - Sandholm, S. T.

AU - Tan, D.

AU - Singh, H. B.

AU - Snow, J.

AU - Heikes, B. G.

PY - 2003/10/27

Y1 - 2003/10/27

N2 - We characterize the chemical composition of Asian continental outflow observed during the NASA Transport and Chemical Evolution over the Pacific (TRACE-P) mission during February-April 2001 in the western Pacific using data collected on the NASA DC-8 aircraft. A significant anthropogenic impact was present in the free troposphere and as far east as 150°E longitude reflecting rapid uplift and transport of continental emissions. Five-day backward trajectories were utilized to identify five principal Asian source regions of outflow: central, coastal, north-northwest (NNW), southeast (SE), and west-southwest (WSW . The maximum mixing ratios for several species, such as CO, C2Cl4, CH3Cl, and hydrocarbons, were more than a factor of 2 larger in the boundary layer of the central and coastal regions due to industrial activity in East Asia. CO was well correlated with C2H2, C2H6, C2Cl4, and CH3Cl at low altitudes in these two regions (r2 ∼ 0.77-0.97). The NNW, WSW, and SE regions were impacted by anthropogenic sources above the boundary layer presumably due to the longer transport distances of air masses to the western Pacific. Frontal and convective lifting of continental emissions was most likely responsible for the high altitude outflow in these three regions. Photochemical processing was influential in each source region resulting in enhanced mixing ratios of O3, PAN, HNO3, H2O2, and CH3OOH. The air masses encountered in all five regions were composed of a complex mixture of photochemically aged air with more recent emissions mixed into the outflow as indicated by enhanced hydrocarbon ratios (C2H2/CO ≥ 3 and C3H8/C2H6 ≥ 0.2). Combustion, industrial activities, and the burning of biofuels and biomass all contributed to the chemical composition of air masses from each source region as demonstrated by the use of C2H2, C2Cl4, and CH3Cl as atmospheric tracers. Mixing ratios of O3, CO, C2H2, C2H6, SO2, and C2Cl4 were compared for the TRACE-P and PEM-West B missions. In the more northern regions, O3, CO, and SO2 were higher at low altitudes during TRACE-P. In general, mixing ratios were fairly similar between the two missions in the southern regions. A comparison between CO/CO2, CO/CH4, C2H6/C3H8, NOx/SO2, and NOy/(SO2 + nss-SO4) ratios for the five source regions and for the 2000 Asian emissions summary showed very close agreement indicating that Asian emissions were well represented by the TRACE-P data and the emissions inventory.

AB - We characterize the chemical composition of Asian continental outflow observed during the NASA Transport and Chemical Evolution over the Pacific (TRACE-P) mission during February-April 2001 in the western Pacific using data collected on the NASA DC-8 aircraft. A significant anthropogenic impact was present in the free troposphere and as far east as 150°E longitude reflecting rapid uplift and transport of continental emissions. Five-day backward trajectories were utilized to identify five principal Asian source regions of outflow: central, coastal, north-northwest (NNW), southeast (SE), and west-southwest (WSW . The maximum mixing ratios for several species, such as CO, C2Cl4, CH3Cl, and hydrocarbons, were more than a factor of 2 larger in the boundary layer of the central and coastal regions due to industrial activity in East Asia. CO was well correlated with C2H2, C2H6, C2Cl4, and CH3Cl at low altitudes in these two regions (r2 ∼ 0.77-0.97). The NNW, WSW, and SE regions were impacted by anthropogenic sources above the boundary layer presumably due to the longer transport distances of air masses to the western Pacific. Frontal and convective lifting of continental emissions was most likely responsible for the high altitude outflow in these three regions. Photochemical processing was influential in each source region resulting in enhanced mixing ratios of O3, PAN, HNO3, H2O2, and CH3OOH. The air masses encountered in all five regions were composed of a complex mixture of photochemically aged air with more recent emissions mixed into the outflow as indicated by enhanced hydrocarbon ratios (C2H2/CO ≥ 3 and C3H8/C2H6 ≥ 0.2). Combustion, industrial activities, and the burning of biofuels and biomass all contributed to the chemical composition of air masses from each source region as demonstrated by the use of C2H2, C2Cl4, and CH3Cl as atmospheric tracers. Mixing ratios of O3, CO, C2H2, C2H6, SO2, and C2Cl4 were compared for the TRACE-P and PEM-West B missions. In the more northern regions, O3, CO, and SO2 were higher at low altitudes during TRACE-P. In general, mixing ratios were fairly similar between the two missions in the southern regions. A comparison between CO/CO2, CO/CH4, C2H6/C3H8, NOx/SO2, and NOy/(SO2 + nss-SO4) ratios for the five source regions and for the 2000 Asian emissions summary showed very close agreement indicating that Asian emissions were well represented by the TRACE-P data and the emissions inventory.

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