Chemical characteristics of Pacific tropospheric air in the region of the Intertropical Convergence Zone and South Pacific Convergence Zone

Gregory, G. L.; Westberg, David; Shipham, M. C.; Blake, D. R.; Newell, Reginald E.; Fuelberg, Henry E.; Talbot, R. W.; Heikes, Brian G.; Atlas, Elliot L.; Sachse, G. W.; Anderson, Bruce; Thornton, D. C.

doi:10.1029/98jd01357

Cited by 67 publications

(63 citation statements)

References 20 publications

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“…C2H2 (pptv)/CO (ppbv) ratios of approximately <0.5, 1, and 3 can be used to characterize air aged approximately >10 days, 5 to 7 days, and a few days, respectively, from an emission source [Gregory et al, 1999]. In a relatively clean equatorial area, the ratio typically is between 0.25 and 0.65 (aged marine air), which is consistent with the meteorological analysis.…”

Section: Co Over the Extratropical Southernsupporting

confidence: 57%

“…To evaluate the relative impact of the above mentioned sources on the CO distribution, a backward trajectory clima-tology for the PEM-T period has been performed by H. E. Gregory et al, 1999]. C2H2 (pptv)/CO (ppbv) ratios of approximately <0.5, 1, and 3 can be used to characterize air aged approximately >10 days, 5 to 7 days, and a few days, respectively, from an emission source [Gregory et al, 1999].…”

Section: Co Over the Extratropical Southernmentioning

confidence: 99%

See 1 more Smart Citation

Pacific Exploratory Mission‐Tropics carbon monoxide measurements in historical context

Pougatchev¹,

Sachse²,

Fuelberg³

et al. 1999

J. Geophys. Res.

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Section: Co Over the Extratropical Southernsupporting

confidence: 57%

Section: Co Over the Extratropical Southernmentioning

confidence: 99%

Pacific Exploratory Mission‐Tropics carbon monoxide measurements in historical context

Pougatchev¹,

Sachse²,

Fuelberg³

et al. 1999

J. Geophys. Res.

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“…A study by Ziemke et al (2009) on biomass burning in the tropics showed a significant impact in increasing the tropospheric ozone levels by 10-25%. Gregory et al (1999) noted that the resulting chemical gradients across each zone was more pronounced below 5 km which is consistent with the strong low-level convergence that is characteristic of each zone, becoming much less pronounced at higher altitudes.…”

Section: Transport Processessupporting

confidence: 54%

Surface ozone profiles at selected South Pacific sites

Chandra¹,

Koshy²,

Maata³

2014

S. Pac. J. Nat. App. Sci.

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“…The locations of the ITCZ and SPCZ are shown for each voyage as vertical lines in Figure 2. The role of the ITCZ and SPCZ as low-altitude barriers to meridional chemical transport has been detailed in numerous studies establishing these boundaries [e.g., Gregory et al, 1999]. In general, few abrupt changes were observed in H 2 and dD crossing the convergence zones (Figure 2).…”

Section: Distribution Of H 2 and Dd-hmentioning

confidence: 92%

Meridional distribution of molecular hydrogen and its deuterium content in the atmosphere

Rice¹,

Quay²,

Stutsman³

et al. 2010

J. Geophys. Res.

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The atmospheric molecular hydrogen concentration and its deuterium abundance were measured in remote air samples collected onboard six Pacific Ocean ship transects between 37°N and 77°S during years 2001 through 2005. The data reveal a year‐round interhemispheric gradient in H2 concentration and isotopic composition with the extratropical Northern Hemisphere lower in H2 concentration by 17 ± 11 ppb and δD of H2 by 16 ± 12‰ than the Southern Hemisphere (95% confidence). On the basis of these snapshots, the interhemispheric gradient in δD was observed to be smallest in September through November, a time that experiences the largest gradient in concentration, and the largest in April, a time that has a small gradient in concentration. A simple hemispheric box model of the atmosphere indicates that, while the hemispheric asymmetry in soil sink of H2 is primarily responsible for the observed interhemispheric gradient in H2 concentration, the hemispheric difference in the δD of the H2 sources and sinks are equally responsible for the observed interhemispheric gradient in δD. Both the inverse correlation between interhemispheric H2 and δD gradients and their seasonal changes point to the importance of the H2 produced by photochemical sources. Comparisons with a three‐dimensional chemical transport model shows reasonable agreement with mean behavior in both variables and provides an accounting for H2 sources and sinks within ±15% without a dramatic change in the H2 budget. Anomalous H2 concentrations and δD in tropics and low‐latitude regions observed during the November–December 2001 meridional H2 and δD snapshot is thought to be a result of H2 emissions from biomass burning, possibly from continental Africa.

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Chemical characteristics of Pacific tropospheric air in the region of the Intertropical Convergence Zone and South Pacific Convergence Zone

Cited by 67 publications

References 20 publications

Pacific Exploratory Mission‐Tropics carbon monoxide measurements in historical context

Pacific Exploratory Mission‐Tropics carbon monoxide measurements in historical context

Surface ozone profiles at selected South Pacific sites

Meridional distribution of molecular hydrogen and its deuterium content in the atmosphere

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