Global 3-D Model Analysis of TRACE-P HCN and CH 3 CN Measurements
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Global 3-D Model Analysis of TRACE-P HCN and CH3CN Measurements
Qinbin Li, Daniel J. Jacob, Robert M. Yantosca Harvard Atmospheric Chemistry Modeling Group
Hanwant B. SinghNASA Ames Research Center
Makoto KoikeUniversity of Tokyo
Glen W. SachseNASA-Langley Research Center
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Atmospheric Budget of HCN(pre-TRACE-P)
Total atmospheric burden (Tg N) 0.50
Atmospheric lifetime (months) 2.1-4.4
Sources (Tg N yr-1)
Biomass burning 1.4-2.9
Sinks (Tg N yr-1)
Ocean uptake 1.1-2.6
Oxidation by OH 0.3
Photolysis 0.2×10-2
Reaction with O(1D) 0.3×10-3
Li et al. [2000]
Biomass burning emission ratio (relative to CO): 1.1%.
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Vertical profiles in marine background atmosphere:Evidence for oceanic uptake of HCN and CH3CN
Background: CO < 120 ppbv, C2Cl4 < 10 pptv
Inferred saturation ratios: 0.84 for HCN, 0.80 for CH3CN
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CH3CN-HCN Correlation in TRACE-P
Red: C2Cl4 > 11 pptvBlue: C2Cl4 < 11 pptv
“Shanghai plume” (flight 13)
Biomassburning
Biofuels (?)
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Use HCN/CO and CH3CN/CO ratios measured in Chinese pollution plumes to infer biofuel
emission ratios
Assuming fresh fossil fuel+biofuel emissions. CO: biofuel/(fossil fuel+biofuel) ~42% for Shanghai + Jiangsu + Zhejiang [D. Streets, 2001] . Hence HCN/CO biofuel emission ratio ~ 0.40%.
DC-8Flight #13
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Correlations: > 2 km Emission ratios relativeto CO (% molar):
biomass burning
Biofuel
HCN 0.14 0.34
CH3CN 0.12 0.22
Asian CO emissions(March 2001):
14 Tg fossil fuel13 Tg biofuel59 Tg biomass burning
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Simulated vs. observed vertical profiles
Red: observationBlue: modelGreen: biomass burningPink: biofuelYellow (CO only): fossil fuel
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Simulated vs. observed frequency distributions
Red: observationBlue: model
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Simulated vs. observed HCN columns
Moshiri (44°N, 142°E)
Rikubetsu (45°N, 144°E)
Tsukuba (36°N, 140°E)
Red: observationBlue: model
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Atmospheric Budgets for HCN and CH3CN
HCN CH3CN
Atmospheric burden (Tg N) 0.42 (0.50) 0.20
Atmospheric lifetime (month) 5.0 (2.1-4.4) 3.2
Sources (Tg N yr-1)
Biomass burning 0.51 (1.4-2.9) 0.43
Biofuel 0.48 0.31
Sinks (Tg N yr-1)
Ocean uptake 0.74 (1.1-2.6) 0.52
Oxidation by OH 0.25 (0.3) 0.22
Li et al. [2000] in red