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  • Other Sources  (3)
  • Environment Pollution  (2)
  • Astronomy  (1)
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  • 1
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    SCIAMACHY and FTS CO2 Retrievals Using the OCO Retrieval Algorithm (2005)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Orbiting Carbon Observatory (OCO) mission will make the first global, space-based measurements of atmospheric C02 with the precision and coverage needed to characterize C02 sources and sinks on regional scales. OCO will make spectrally and spatially highly resolved measurements of reflected sunlight in the 02A -band and two near-infrared C02 bands. To test the OCO retrieval algorithm, SCIAMACHY and ground-based Fourier Transform Spectrometer (FTS) measurements at Park Falls, Wisconsin have been analyzed. Good agreement between SCIAMACHY and FTS C02 columns has been found with SCIAMACHY showing a much larger scatter than FTS measurements. Both SCIAMACHY and FTS overestimate the surface pressure by a few percent which significantly impacts retrieved C02 columns.
    Keywords: Astronomy
    Type: 7th International Carbon Dioxide Conference; Sep 25, 2005 - Sep 30, 2005; Boulder, CO; United States
    Format: text
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  • 2
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    Observational Constraints on Glyoxal Production from Isoprene Oxidation and Its Contribution to Organic Aerosol over the Southeast United States (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: We use a 0-D photochemical box model and a 3-D global chemistry-climate model, combined with observations from the NOAA Southeast Nexus (SENEX) aircraft campaign, to understand the sources and sinks of glyoxal over the Southeast United States. Box model simulations suggest a large difference in glyoxal production among three isoprene oxidation mechanisms (AM3ST, AM3B, and Master Chemical Mechanism (MCM) v3.3.1). These mechanisms are then implemented into a 3-D global chemistry-climate model. Comparison with field observations shows that the average vertical profile of glyoxal is best reproduced by AM3ST with an effective reactive uptake coefficient gamma(sub glyx) of 2 x 10(exp -3) and AM3B without heterogeneous loss of glyoxal. The two mechanisms lead to 0-0.8micrograms m(exp -3) secondary organic aerosol (SOA) from glyoxal in the boundary layer of the Southeast U.S. in summer. We consider this to be the lower limit for the contribution of glyoxal to SOA, as other sources of glyoxal other than isoprene are not included in our model. In addition, we find that AM3B shows better agreement on both formaldehyde and the correlation between glyoxal and formaldehyde (RGF[GLYX]/[HCHO]), resulting from the suppression of delta-isoprene peroxy radicals (delta-ISOPO2). We also find that MCM v3.3.1 may underestimate glyoxal production from isoprene oxidation, in part due to an underestimated yield from the reaction of isoprene epoxydiol (IEPOX) peroxy radicals with HO2. Our work highlights that the gas-phase production of glyoxal represents a large uncertainty in quantifying its contribution to SOA.
    Keywords: Environment Pollution
    Type: GSFC-E-DAA-TN41635 , Journal of Geophysical Research: Atmospheres (ISSN 2169-897X) (e-ISSN 2169-8996); 121; 16; 9849-9861
    Format: application/pdf
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  • 3
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    Emissions of Glyoxal and Other Carbonyl Compounds from Agricultural Biomass Burning Plumes Sampled by Aircraft (2017)
    In:  CASI
    Details
    Publication Date: 2019-08-09
    Description: We report enhancements of glyoxal relative to carbon monoxide and formaldehyde from biomass burning plumes intercepted from the NOAA WP-3D aircraft during the 2013 Southeast Nexus and 2015 Shale Oil and Natural Gas Nexus field campaigns. The intercepted biomass burning plumes were from small agricultural fires. Since the plume ages were not known, these values are normalized excess mixing ratios, instead of the more common emission ratio, which is used only for fresh emissions. Glyoxal was measured using broadband cavity enhanced spectroscopy, which provides a sensitive and highly selective measurement of glyoxal. Emissions of other species such as methane, formaldehyde, and nitrous acid agreed with previous laboratory and field measurements, but the glyoxal emissions relative to CO were on average a factor of 4 lower than previously reported. Several glyoxal loss processes such as aerosol uptake were examined to determine if they could affect the observed glyoxal concentrations, but they were insufficient to explain the lower measured values of glyoxal relative to other biomass burning trace gases, indicating that glyoxal emissions from biomass burning may be significantly overestimated.
    Keywords: Environment Pollution
    Type: NF1676L-27262 , GSFC-E-DAA-TN47723 , Environmental Science and Technology (ISSN 0013-936X) (e-ISSN 1520-5851); 51; 20; 11761-11770
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