Carbon monoxide measurements from 76° N to 59° S and over the South Tasman Sea

Kok, Gregory L.; Prévôt, Andrê S. H.; Schillawski, Richard D.; Johnson, James E.

doi:10.1029/98jd00527

Cited by 12 publications

(5 citation statements)

References 18 publications

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“…Most of the instruments have been described elsewhere [Sprung et al, Carbon monoxide was measured using a gas filter correlation analyzer (Thermo Environmental Instruments Inc., Model 48), modified according to Dickerson and Delany [1988]. Ambient sampling, zeroing and calibration protocols were identical to those described by Kok et al [1998]. The raw data were processed with a 60-s running average filter to reduce noise.…”

Section: Methodsmentioning

confidence: 75%

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Chemical characterization of pollution layers over the tropical Indian Ocean: Signatures of emissions from biomass and fossil fuel burning

et al. 2001

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On the other hand, high mixing ratios of sulfur dioxide (up to 1.5 ppb) and aerosol sulfate (up to 3 ppb) indicate the influence of fossil fuel burning. During most flights the contributions from these two sources were well mixed within the same air mass, suggesting that the sources on the ground are also close to each other. This is consistent with the assumption that biomass is mainly burnt as biofuel for domestic use in populated areas, where fossil fuel is also used. The ratios dX/dCO (X:acetone, acetonitrile, sulfur dioxide, potassium, or sulfate) measured during the flights indicate that most of the CO in the continental outflow is due to biomass or biofuel burning, whereas the majority of the aerosols results from fossil fuel burning.

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Section: Methodsmentioning

confidence: 75%

“…Ambient sampling, zeroing and calibration protocols were identical to those described by Kok et al [1998]. The raw data were processed with a 60-s running average filter to reduce noise.…”

Section: Methodsmentioning

confidence: 99%

Chemical characterization of pollution layers over the tropical Indian Ocean: Signatures of emissions from biomass and fossil fuel burning

et al. 2001

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“… References: A— Routhier et al , 1980; B— Heidt et al , 1980; C— Routhier and Davis , 1980; D— Beck et al , 1987; E— Sachse et al , 1987; F— Hoell et al , 1987b; G— Hoell et al , 1987a; H— Ridley et al , 1987; I— Davis et al , 1987; J— Hoell et al , 1990; K— Gregory et al , 1990; L— Sandholm et al , 1990; M— Carroll et al , 1990; N— Hoell et al , 1996; O— Kondo et al , 1996; P— Blake et al , 1996; Q— Atlas and Ridley , 1996; R— Hoell et al , 1997; S— Sandholm et al , 1997; T— Kondo et al , 1997; U— Blake et al , 1997; V— Bates et al , 1998; X— Kok et al , 1998; Y— Blake et al , 1999b; Z— Hoell et al , 1999; AA— Pougatchev et al , 1999; AB— Blake et al , 1999a; AC— Raper et al , 2001; AD— Blake et al , 2001. …”

Section: Databaseunclassified

Central/eastern North Pacific photochemical precursor distributions for fall/spring seasons as defined by airborne field studies

et al. 2003

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[1] Data from 10 aircraft programs recorded over the central/eastern North Pacific (180°-120°W, 0°-45°N) were assembled for the purpose of assessing an atmospheric chemical climatology for this region. It represents an early effort at carrying out this task and, thus, it can be expected to undergo many updates in the future. Such a database is useful in both gaining further insights concerning the fundamental processes controlling the chemistry of this region as well as serving as an important baseline by which to evaluate future change. Critical photochemical precursors examined included O 3 , CO, NO x , and H 2 O. In addition, the distribution profiles for select nonmethane hydrocarbons were explored. The precursor data were analyzed according to latitude, pressure altitude, and season of the year. Contrasting the spring and fall measurements, major trends that surfaced in both ozone and CO included observing elevated levels in spring compared to fall, with the largest spring increase occurring at latitudes north of 15°N. Both NO x and H 2 O showed trends quite different from that of CO and O 3 , with an indication of higher mixing ratio levels during the fall season. Variations in precursor distribution patterns within a season will be explained based on climatological flow patterns for the region and the resulting connection to source regions. Where possible, comparisons were performed with other sampling strategies, including ground-based observations, sonde, and satellite data, and data collected during shuttle missions. Overall, these comparisons revealed a reasonably high level of correspondence between the airborne ensemble data and those collected using other sampling strategies.

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“…Detection of CO when separated using GC is generally performed using an RGD where one CO molecule reacts with hot HgO and releases one Hg molecule from the catalytic bed, which is then detected by UV absorption (Kok et al, 1998).…”

Section: Detectionmentioning

confidence: 99%