The impact of volcanic gases from Miyake island on the chemical constituents in precipitation in the Tokyo metropolitan area

Tomoaki Okuda, Tamami Iwase, Hideko Ueda, Yusuke Suda, Shigeru Tanaka, Yukiko Dokiya, Katsuhiko Fushimi, Morikazu Hosoe

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Abstract

The volcano on Miyake Island first erupted in July 2000 and continuous emission of volcanic gas from the collapsed caldera has been observed from the middle of August 2000. The large volcanic emission of SO2 had a strong influence on Tokyo metropolitan area, which is located approximately 150 km north of Miyake Island. We measured major ions in precipitation and dry deposition samples which had been collected at five sampling sites (Yokohama, Kashiwa, Fujisawa, Yokosuka, and Hachioji) in the Tokyo metropolitan area for 12 years since 1990. We have evaluated quantitatively the impact of the volcanic SO2 gas emitted from Miyake Island on the Tokyo metropolitan area by comparing depositional ionic constituents in the volcanic degassing period (from September 2000 to August 2001) with those in the normal period of the past 10 years (September 1990 to August 2000). nss-SO42- concentrations in precipitation at the sampling sites in the Tokyo metropolitan area were 59.5-77.0 μeq/L during the degassing period, and 33.3-44.1 μeq/L during the normal period, respectively. The difference of nss-SO 42- concentrations between the two periods was statistically significant. In contrast, no significant differences were observed in the concentrations of the other major ions (NH4+, nss-Ca2+, Cl-, and NO3-) between the two periods. The impact of volcanic degassing from Miyake Island on the ionic concentrations in the precipitation of the Tokyo metropolitan area was seen only in the H+ and nss-SO42- concentrations. The annual wet deposition amount of volcanic nss-SO42- into the Tokyo metropolitan area has been quantitatively estimated. The annual wet deposition amounts were calculated as 701±277 Meq/year (22.4±8.9 kt SO2/year) on the total area of the Tokyo metropolitan area (14,000 km2). The wet deposition amount of nss-SO42- corresponds to only 0.15% of the total annual amount of volcanic SO2 (15 Mt/year) emitted from Miyake Island from September 2000 to August 2001. This estimation is consistent with a previous study which reported that 0.3% of the atmospheric discharge of SO2 from the volcano in Mt. Etna in Sicily was deposited by precipitation to the surrounding area (1200 km2). The annual wet deposition amount of volcanic SO2 to the Tokyo metropolitan area was at the same order of the magnitude (37±15%) as the annual anthropogenic SO2 amount (60 kt/year) emitted from the Tokyo metropolitan area.

Original languageEnglish
Pages (from-to)185-197
Number of pages13
JournalScience of the Total Environment
Volume341
Issue number1-3
DOIs
Publication statusPublished - 2005 Apr 1

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Volcanic Eruptions
volcanic gas
metropolitan area
Degassing
Gases
Volcanoes
wet deposition
degassing
Ions
Sampling
volcano
chemical
ion
sampling
dry deposition
caldera

Keywords

  • Acid rain
  • Backward trajectory
  • Network observation
  • Precipitation
  • Sulfate
  • Tokyo metropolitan area
  • Volcanic gases

ASJC Scopus subject areas

  • Environmental Chemistry
  • Environmental Science(all)

Cite this

The impact of volcanic gases from Miyake island on the chemical constituents in precipitation in the Tokyo metropolitan area. / Okuda, Tomoaki; Iwase, Tamami; Ueda, Hideko; Suda, Yusuke; Tanaka, Shigeru; Dokiya, Yukiko; Fushimi, Katsuhiko; Hosoe, Morikazu.

In: Science of the Total Environment, Vol. 341, No. 1-3, 01.04.2005, p. 185-197.

Research output: Contribution to journalArticle

Okuda, Tomoaki ; Iwase, Tamami ; Ueda, Hideko ; Suda, Yusuke ; Tanaka, Shigeru ; Dokiya, Yukiko ; Fushimi, Katsuhiko ; Hosoe, Morikazu. / The impact of volcanic gases from Miyake island on the chemical constituents in precipitation in the Tokyo metropolitan area. In: Science of the Total Environment. 2005 ; Vol. 341, No. 1-3. pp. 185-197.
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AU - Tanaka, Shigeru

AU - Dokiya, Yukiko

AU - Fushimi, Katsuhiko

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N2 - The volcano on Miyake Island first erupted in July 2000 and continuous emission of volcanic gas from the collapsed caldera has been observed from the middle of August 2000. The large volcanic emission of SO2 had a strong influence on Tokyo metropolitan area, which is located approximately 150 km north of Miyake Island. We measured major ions in precipitation and dry deposition samples which had been collected at five sampling sites (Yokohama, Kashiwa, Fujisawa, Yokosuka, and Hachioji) in the Tokyo metropolitan area for 12 years since 1990. We have evaluated quantitatively the impact of the volcanic SO2 gas emitted from Miyake Island on the Tokyo metropolitan area by comparing depositional ionic constituents in the volcanic degassing period (from September 2000 to August 2001) with those in the normal period of the past 10 years (September 1990 to August 2000). nss-SO42- concentrations in precipitation at the sampling sites in the Tokyo metropolitan area were 59.5-77.0 μeq/L during the degassing period, and 33.3-44.1 μeq/L during the normal period, respectively. The difference of nss-SO 42- concentrations between the two periods was statistically significant. In contrast, no significant differences were observed in the concentrations of the other major ions (NH4+, nss-Ca2+, Cl-, and NO3-) between the two periods. The impact of volcanic degassing from Miyake Island on the ionic concentrations in the precipitation of the Tokyo metropolitan area was seen only in the H+ and nss-SO42- concentrations. The annual wet deposition amount of volcanic nss-SO42- into the Tokyo metropolitan area has been quantitatively estimated. The annual wet deposition amounts were calculated as 701±277 Meq/year (22.4±8.9 kt SO2/year) on the total area of the Tokyo metropolitan area (14,000 km2). The wet deposition amount of nss-SO42- corresponds to only 0.15% of the total annual amount of volcanic SO2 (15 Mt/year) emitted from Miyake Island from September 2000 to August 2001. This estimation is consistent with a previous study which reported that 0.3% of the atmospheric discharge of SO2 from the volcano in Mt. Etna in Sicily was deposited by precipitation to the surrounding area (1200 km2). The annual wet deposition amount of volcanic SO2 to the Tokyo metropolitan area was at the same order of the magnitude (37±15%) as the annual anthropogenic SO2 amount (60 kt/year) emitted from the Tokyo metropolitan area.

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