Hedo 　 NIES 　 resultsSpring 2004

*Akinori Takami, Takao Miyoshi, Akio Shimono, Shiro Hatakeyama, NIES, Japan

takamia@nies.go.jp

Outline

• Chemical analysis of aerosol by Aerodyne Aerosol Spectrometer (AMS) at Cape Hedo, Okinawa Japan

• Comparison to previous data (Fukue)

China

JapanKorea

Fukue

N

Hedo, Okinawa

Map of East Asia and Our observation areas and places

• 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)

Experimental; Aerosol Mass Spectrometer (Aerodyne AMS)

AMS at Hedo OkinawaMeasurement site at HedoMin.Of Environment, Japan site

Chemical components measured by AMS at Hedo, Okinawa spring 2004

High sulfate loadings

31M

2A

20A

av. ug m-3NH4, 2.00NO3, 0.16SO4, 6.95Cl, 0.04Org 2.14

12

10

8

6

4

2

0

dM/d

logD

va (

µg

m-3

)

5 6 7 8 9100

2 3 4 5 6 7 8 91000

2

Vacuum Aerodynamic Diameter (nm)

Ammonium Nitrate Sulphate Organics Org 44

High sulfate on 2 AprilSimilar TOF shape; internally mixedAir masses from Chinese continent

Chemical components measured by AMS at Hedo, Okinawa spring 2004

50-60 % are sulfate

China

JapanKorea

N

Okinawa0.77 , 0.02, 0.30

Fukue 0.91, 0.10, 1.05

Nitrate to sulfate ratio and organics to sulfate ratio decrease in remote islands. Chemical transformation occurred.

Ratio of nitrate, ammonium to sulfateBlue NO3/SO4, Orange NH4/SO4, Ratio in neq m-3

Green Org / SO4 g m-3