Hedo NIES results Spring 2004

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Hedo NIES resultsSpring 2004

• Akinori Takami, Takao Miyoshi, Akio Shimono,
• Shiro Hatakeyama, NIES, Japan
• takamia_at_nies.go.jp

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Outline

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

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Map of East Asia and Our observation areas and
places
N
Japan
Korea
Fukue
China
Hedo, Okinawa
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Experimental Aerosol Mass Spectrometer
(Aerodyne AMS)
Credit for animation Matt Thyson (Massachusetts)
Prof. Jose-Luis Jimenez (U Colorado)

• 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)

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Measurement site at Hedo Min.Of Environment,
Japan site
AMS at Hedo Okinawa
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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
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High sulfate on 2 April Similar TOF shape
internally mixed Air masses from Chinese continent
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Chemical components measured by AMS at Hedo,
Okinawa spring 2004
50-60 are sulfate
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Ratio of nitrate, ammonium to sulfate Blue
NO3/SO4, Orange NH4/SO4, Ratio in neq m-3 Green
Org / SO4 mg m-3
N
Japan
Korea
Fukue 0.91, 0.10, 1.05
China
Okinawa 0.77 , 0.02, 0.30
Nitrate to sulfate ratio and organics to sulfate
ratio decrease in remote islands. Chemical
transformation occurred.