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Aerosol Chemical Analysis at Cape Hedo, Okinawa: Spring 2004 Data Insights

This study presents a comprehensive chemical analysis of aerosols collected at Cape Hedo, Okinawa, during spring 2004 using the Aerodyne Aerosol Mass Spectrometer (AMS). The findings include a comparison to previous data from Fukue, highlighting geographic influences on aerosol composition across East Asia, including Japan, Korea, and China. Key measurements show high sulfate concentrations, with significant ratios of nitrate and ammonium to sulfate, indicating chemical transformations. This work contributes to understanding regional aerosol characteristics and their impact on air quality.

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Aerosol Chemical Analysis at Cape Hedo, Okinawa: Spring 2004 Data Insights

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  1. HedoNIESresultsSpring 2004 *Akinori Takami, Takao Miyoshi, Akio Shimono, Shiro Hatakeyama, NIES, Japan takamia@nies.go.jp

  2. Outline • Chemical analysis of aerosol by Aerodyne Aerosol Spectrometer (AMS) at Cape Hedo, Okinawa Japan • Comparison to previous data (Fukue)

  3. Map of East Asia and Our observation areas and places N Japan Korea Fukue China Hedo, Okinawa

  4. Experimental; Aerosol Mass Spectrometer (Aerodyne AMS) • Particle Separation: High Vacuum with Aerodynamic lens system(Non-refractory PM1.0) • Size Distribution: Particle Time-of-Flight • Chemical Composition: Flash Vaporization with EI Mass Spectrometry (0-300 amu) Credit for animation: Matt Thyson (Massachusetts) & Prof. Jose-Luis Jimenez (U Colorado)

  5. Measurement site at Hedo Min.Of Environment, Japan site AMS at Hedo Okinawa

  6. Chemical components measured by AMS at Hedo, Okinawa spring 2004 High sulfate loadings 20A 31M av. ug m-3 NH4, 2.00 NO3, 0.16 SO4, 6.95 Cl, 0.04 Org 2.14 2A

  7. High sulfate on 2 April Similar TOF shape; internally mixed Air masses from Chinese continent

  8. Chemical components measured by AMS at Hedo, Okinawa spring 2004 50-60 % are sulfate

  9. Ratio of nitrate, ammonium to sulfate Blue NO3/SO4, Orange NH4/SO4, Ratio in neq m-3 Green Org / SO4mg m-3 N Japan Korea Fukue 0.91, 0.10, 1.05 China Okinawa 0.77 , 0.02, 0.30 Nitrate to sulfate ratio andorganics to sulfate ratiodecrease in remote islands. Chemical transformation occurred.

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