Abstract
Observations of air pollutants were conducted in remote Japanese islands (Oki Island and Okinawa Island) in early spring to clarify the extent of trans-boundary air pollution from the Asian continent. A three-dimensional Eulerian model calculation, which included parameters on emission, transport and transformation of sulfur oxides, nitrogen oxides and ammonia, was performed to compile sulfate isosurface concentrations over the observational sites. Concentrations of non-sea-salt sulfate (nss-SO42-) of greater than 10μgm-3 were observed at Oki after the northeastward passage of low-pressure systems in the Sea of Japan. At these times, the weather showed a typical winter pattern and air pollutants over China were transported southeastward to Japan with the northwesterly wind. The model calculation reproduced the observed variations of nss-SO42- concentration well, except for one case in which the model calculation could not reproduce the extremely low nss-SO42- concentration observed on 8 March. In Hedo (Okinawa Island), we observed long-lasting (3 days) medium concentrations of nss-SO42- (approximately 5μgm-3). Although the model reproduced these observed medium concentrations well, in general the observed results were reproduced better for Oki than for Hedo. Under the synoptic weather conditions of early spring, high concentrations of nss-sulfate were sometimes transported to these remote Japanese islands from areas of continental Asia with a strong outflow of air pollutants. Copyright (C) 2000 Elsevier Science B.V.
| Original language | English |
|---|---|
| Pages (from-to) | 5139-5149 |
| Number of pages | 11 |
| Journal | Atmospheric Environment |
| Volume | 34 |
| Issue number | 29-30 |
| DOIs | |
| Publication status | Published - Jan 1 2000 |
| Event | 6th Scientific Conference of the International Global Atmospheric Chemistry Project (IGAC) - Bologna, Italy Duration: Sep 13 1999 → Sep 17 1999 |
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All Science Journal Classification (ASJC) codes
- Environmental Science(all)
- Atmospheric Science
Cite this
Trans-boundary air pollution over remote islands in Japan : Observed data and estimates from a numerical model. / Murano, Kentaro; Mukai, Hitoshi; Hatakeyama, Shiro; Suk Jang, Eun; Uno, Itsushi.
In: Atmospheric Environment, Vol. 34, No. 29-30, 01.01.2000, p. 5139-5149.Research output: Contribution to journal › Conference article
}
TY - JOUR
T1 - Trans-boundary air pollution over remote islands in Japan
T2 - Observed data and estimates from a numerical model
AU - Murano, Kentaro
AU - Mukai, Hitoshi
AU - Hatakeyama, Shiro
AU - Suk Jang, Eun
AU - Uno, Itsushi
PY - 2000/1/1
Y1 - 2000/1/1
N2 - Observations of air pollutants were conducted in remote Japanese islands (Oki Island and Okinawa Island) in early spring to clarify the extent of trans-boundary air pollution from the Asian continent. A three-dimensional Eulerian model calculation, which included parameters on emission, transport and transformation of sulfur oxides, nitrogen oxides and ammonia, was performed to compile sulfate isosurface concentrations over the observational sites. Concentrations of non-sea-salt sulfate (nss-SO42-) of greater than 10μgm-3 were observed at Oki after the northeastward passage of low-pressure systems in the Sea of Japan. At these times, the weather showed a typical winter pattern and air pollutants over China were transported southeastward to Japan with the northwesterly wind. The model calculation reproduced the observed variations of nss-SO42- concentration well, except for one case in which the model calculation could not reproduce the extremely low nss-SO42- concentration observed on 8 March. In Hedo (Okinawa Island), we observed long-lasting (3 days) medium concentrations of nss-SO42- (approximately 5μgm-3). Although the model reproduced these observed medium concentrations well, in general the observed results were reproduced better for Oki than for Hedo. Under the synoptic weather conditions of early spring, high concentrations of nss-sulfate were sometimes transported to these remote Japanese islands from areas of continental Asia with a strong outflow of air pollutants. Copyright (C) 2000 Elsevier Science B.V.
AB - Observations of air pollutants were conducted in remote Japanese islands (Oki Island and Okinawa Island) in early spring to clarify the extent of trans-boundary air pollution from the Asian continent. A three-dimensional Eulerian model calculation, which included parameters on emission, transport and transformation of sulfur oxides, nitrogen oxides and ammonia, was performed to compile sulfate isosurface concentrations over the observational sites. Concentrations of non-sea-salt sulfate (nss-SO42-) of greater than 10μgm-3 were observed at Oki after the northeastward passage of low-pressure systems in the Sea of Japan. At these times, the weather showed a typical winter pattern and air pollutants over China were transported southeastward to Japan with the northwesterly wind. The model calculation reproduced the observed variations of nss-SO42- concentration well, except for one case in which the model calculation could not reproduce the extremely low nss-SO42- concentration observed on 8 March. In Hedo (Okinawa Island), we observed long-lasting (3 days) medium concentrations of nss-SO42- (approximately 5μgm-3). Although the model reproduced these observed medium concentrations well, in general the observed results were reproduced better for Oki than for Hedo. Under the synoptic weather conditions of early spring, high concentrations of nss-sulfate were sometimes transported to these remote Japanese islands from areas of continental Asia with a strong outflow of air pollutants. Copyright (C) 2000 Elsevier Science B.V.
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U2 - 10.1016/S1352-2310(00)00319-8
DO - 10.1016/S1352-2310(00)00319-8
M3 - Conference article
AN - SCOPUS:0034287542
VL - 34
SP - 5139
EP - 5149
JO - Atmospheric Environment
JF - Atmospheric Environment
SN - 1352-2310
IS - 29-30
ER -