Profiling of formaldehyde, glyoxal, methylglyoxal, and CO over the Amazon: Normalised excess mixing ratios and related emission factors in biomass burning plumes

doi:10.5194/acp-2020-129

GSTDTAP > 地球科学

DOI	10.5194/acp-2020-129
	Profiling of formaldehyde, glyoxal, methylglyoxal, and CO over the Amazon: Normalised excess mixing ratios and related emission factors in biomass burning plumes
	Flora Kluge, Tilman Hüneke, Matthias Knecht, Michael Lichtenstern, Meike Rotermund, Hans Schlager, Benjamin Schreiner, and Klaus Pfeilsticker
	2020-05-12
发表期刊	Atmospheric Chemistry and Physics
出版年	2020
英文摘要	We report on airborne measurements of tropospheric mixing ratios and vertical profiles of CH₂O, C₂H₂O₂, C₃H₄O₂^, and CO over the Amazon Basin during the ACRIDICON-CHUVA campaign from the German High Altitude and Long-range research aircraft (HALO) in fall 2014. The joint observation of in situ CO and remotely measured CH₂O, C₂H₂O₂, C₃H₄O₂^, together with visible imagery and air mass back trajectory modelling using NOAA HYSPLIT (National Oceanic Atmospheric Administration, HYbrid Single-Particle Lagrangian Integrated Trajectory) allow us to discriminate between the probing of background tropical air, in which the concentration of the measured species results from the oxidation of biogenically emitted VOCs (mostly isoprene), and measurements of moderately to strongly polluted air masses affected by biomass burning emissions or the city plume of Manaus. For twelve near surface measurements of fresh biomass burning plumes, normalized excess mixing ratios of C₂H₂O₂ and C₃H₄O₂^* with respect to CH₂O are inferred and compared to recent studies. The mean R_GF = 0.07 (range 0.02–0.11) is in good agreement with recent reports which suggest R_GF to be significantly lower than previously assumed in global CTM models. The mean R_MF = 0.98 (range 0.09–1.50) varies significantly during the different observational settings, but overall appears to be much larger (up to a factor of 5) than previous reports suggest when applaying a correction factor of 2.0 ± 0.5 to account for the additional dicarbonyls included in the C₃H₄O₂^* measurements. Using recently reported emission factors of CH₂O for tropical forests, our observations suggest emission factors of EF_G = 0.25 (range 0.11 to 0.52) g per kg for C₂H₂O₂, and EF_M = 4.7 (range 0.5 to 8.64) g per kg for C₃H₄O₂^*. While EF_G agrees well with recent reports, EF_M is (like R_MF) slightly larger than reported in other studies, presumably due to the different plume ages or fuels studied. Our observations of these critical carbonyls and intermediate oxidation products may support future photochemical modelling of air pollution over tropical vegetation, as well as validate past and present space-borne observations of the respective species.
领域	地球科学
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/249077
专题	地球科学
推荐引用方式 GB/T 7714	Flora Kluge, Tilman Hüneke, Matthias Knecht, Michael Lichtenstern, Meike Rotermund, Hans Schlager, Benjamin Schreiner, and Klaus Pfeilsticker. Profiling of formaldehyde, glyoxal, methylglyoxal, and CO over the Amazon: Normalised excess mixing ratios and related emission factors in biomass burning plumes[J]. Atmospheric Chemistry and Physics,2020.
APA	Flora Kluge, Tilman Hüneke, Matthias Knecht, Michael Lichtenstern, Meike Rotermund, Hans Schlager, Benjamin Schreiner, and Klaus Pfeilsticker.(2020).Profiling of formaldehyde, glyoxal, methylglyoxal, and CO over the Amazon: Normalised excess mixing ratios and related emission factors in biomass burning plumes.Atmospheric Chemistry and Physics.
MLA	Flora Kluge, Tilman Hüneke, Matthias Knecht, Michael Lichtenstern, Meike Rotermund, Hans Schlager, Benjamin Schreiner, and Klaus Pfeilsticker."Profiling of formaldehyde, glyoxal, methylglyoxal, and CO over the Amazon: Normalised excess mixing ratios and related emission factors in biomass burning plumes".Atmospheric Chemistry and Physics (2020).