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[C-1.1.1 Studies on the Behavior of Acidic and Oxidative Component in East Asia by Ground Based Observation]

[Contact Person]

Kentaro Murano
Senior Research Scientist, Acid Deposition Research Team
Global Environment Division, National Institute for Environmental Studies
Environmental Agency
16-2, Onogawa, Tsukuba, Ibaraki 305 Japan
Phone:+81-298-51-6111(Ext.437), Fax:+81-298-51-4732

[Total Budget for FY1990-1992]

41,225,000 Yen

[Abstract]

　In order to clarify the behavior of atmospheric pollutants, observation of atmospheric pollutants had been carried out at several places where the air pollutants from Asian continent may reach. In Okinawa Is., maximum ozone level of 91ppb was observed in May. The lowest monthly average ozone concentration of 11 ppb was recorded in July. Back trajectory analysis of air mass from Oki Is. showed that the contribution from Asian continent were 70-80% in winter, while it was 50-60% and 30-40% in the spring and summer, respectively. The long term record of particulate non-sea-salt sulfate concentrations showed nearly 5% increase. The main contributor of inorganic ion of particulate matter on Happo-one is sulfate. The deposition of non-sea-salt sulfate on Happo-one is twice as much of that in urban Nagano city. In the western part of Aomori Pref. , the concentration of non-sea-salt sulfate was low in the summer and high in the winter when the northwest wind prevailed. The sampling point on the coast of Sea of Japan exhibited a similar level of the concentration of non-sea-salt sulfate compared to those of inland areas, so long range transport of air pollutants were significantly indicated.

[Key Words]

East Asia, Long Range Transport, Ozone, Back Trajectory