Airborne measurement of inorganic ionic components of fine aerosol particles using the particle-into-liquid sampler coupled to ion chromatography technique during ACE-Asia and TRACE-P

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Read Full Article (file size: 3328334 bytes) Cited by JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 108, NO. D23, 8646, doi:10.1029/2002JD003265, 2003 Airborne measurement of inorganic ionic components of fine aerosol particles using the particle-into-liquid sampler coupled to ion chromatography technique during ACE-Asia and TRACE-P Y.-N. Lee Atmospheric Sciences Division, Brookhaven National Laboratory, Upton, New York, USA R. Weber School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA Y. Ma School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA D. Orsini School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA K. Maxwell-Meier School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA D. Blake Department of Chemistry, University of California, Irvine, California, USA S. Meinardi Department of Chemistry, University of California, Irvine, California, USA G. Sachse NASA Langley Research Center, Hampton, Virginia, USA C. Harward NASA Langley Research Center, Hampton, Virginia, USA T.-Y. Chen Environmental Change Research Project, Academia Sinica, Taipei, Taiwan D. Thornton Department of Chemistry, Drexel University, Philadelphia, Pennsylvania, USA F.-H. Tu Department of Chemistry, Drexel University, Philadelphia, Pennsylvania, USA A. Bandy Department of Chemistry, Drexel University, Philadelphia, Pennsylvania, USA Abstract Eight inorganic ions in fine aerosol particles (D_p < 1.3 μm) were measured on board the NCAR C130 and NASA P-3B aircraft during the 2001 Aerosol Characterization Experiment (ACE)-Asia and the Transport and Chemical Evolution over the Pacific (TRACE-P) experiments, respectively. Concentrations of NH₄ ⁺, SO₄ ²⁻, NO₃ ⁻, Ca²⁺, K⁺, Mg²⁺, Na⁺, and Cl⁻ were determined using a particle-into-liquid sampler coupled to ion chromatography (PILS-IC) technique at a 4-min resolution and a limit of detection <0.05 μg m⁻³. The maximum total ion concentrations observed on the C130 and the P-3B were 27 μg m⁻³ and 84 μg m⁻³, respectively. During ACE-Asia, NH₄ ⁺ and SO₄ ²⁻ dominated, with the dust-derived Ca²⁺ contributing nearly equally as SO₄ ²⁻ in mixing ratios. The sea-salt-derived Na⁺ and Cl⁻ were comparable to biomass-burning tracer K⁺, showing >1 ppbv only in the top 1% sample population. During TRACE-P, NH₄ ⁺ dominated, followed by SO₄ ²⁻, Cl⁻, Na⁺, NO₃ ⁻, Ca²⁺, and K⁺, in decreasing order of importance. In addition to a sea-salt origin, Cl⁻ showed a source in urban emissions possibly related to biofuel combustion. Both sea salt and dust contributed to Mg²⁺. In both experiments, NH₄ ⁺, SO₄ ²⁻, NO₃ ⁻, and CO were strongly correlated, indicating that combustion was the dominant source of these species and that NH₃ and other alkaline materials were in sufficient supply to neutralize H₂SO₄. The [NH₄ ⁺] to ([NO₃ ⁻] + 2[SO₄ ²⁻]) ratio was ∼0.70 in the two campaigns, with deviations found only in volcano plumes, whereby SO₄ ²⁻ was found to correlate with SO₂. Charge balance of the ions showed both positive and negative deviations whose magnitudes, ∼30%, provide estimates of the lower limits of unmeasured ions. Elevated NO₃ ⁻ and Ca²⁺ coexist mainly under polluted conditions, suggesting the importance of sequestering HNO₃ by mineral dust. Received 1 December 2002; accepted 28 March 2003; published 13 September 2003. Index Terms: 0305 Atmospheric Composition and Structure: Aerosols and particles (0345, 4801); 0322 Atmospheric Composition and Structure: Constituent sources and sinks; 0365 Atmospheric Composition and Structure: Troposphere—composition and chemistry; 0368 Atmospheric Composition and Structure: Troposphere—constituent transport and chemistry; 0394 Atmospheric Composition and Structure: Instruments and techniques. Read Full Article (file size: 3328334 bytes) Cited by Citation: Lee, Y.-N., et al. (2003), Airborne measurement of inorganic ionic components of fine aerosol particles using the particle-into-liquid sampler coupled to ion chromatography technique during ACE-Asia and TRACE-P, J. Geophys. Res., 108(D23), 8646, doi:10.1029/2002JD003265. Copyright 2003 by the American Geophysical Union.

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