Characteristics of Chemical Constituents of Rain in the Western Pacific Equatorial Ocean Sampled by the Sequential Constant Volume Method
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Accession number;06A1016261
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| Title;Characteristics of Chemical Constituents of Rain in the Western Pacific Equatorial Ocean Sampled by the Sequential Constant Volume Method |
| Author;
KOBAYASHI KEN
(Kobe Univ.)
HIRAKI TAKATOSHI
(Hyogo Prefectural Inst. Of Public Health And Environmental Sci.)
YAMASHITA EIJI
(Okayama Univ. Sci.)
ISHIDA HIROSHI
(Kobe Univ.)
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Journal Title;Kaiyo Kogaku Shinpojiumu (CD-ROM)
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Journal Code:S0108B
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ISSN:
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VOL.19th;NO.;PAGE.ROMBUNNO.30(2006)
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| Figure&Table&Reference;FIG.6, TBL.3, REF.9 |
| Pub. Country;Japan |
| Language;English |
| Abstract;To unveil the characteristics of the chemical constituents of rain in the ocean, rain was sampled every 1mm until 8mm by the sequential constant volume rain sampler on board the R/V MIRAI in the Western Pacific Equatorial Ocean from March 2 through March 15, 2004. Analytical parameters are pH, EC and the ion concentrations of F'-', Cl'-', NO2'-', NO3'-', SO4'2-', Na'+', NH4'+', K'+', Mg'2+', and Ca'2+'. The pH value of rain ranged from 5.23 to 6.03. The mean value was 5.48 and 0.66 higher than the mean value, 4.82, in Japan. The EC value of rain ranged between 4.5 and 43.9.MU.S/cm, and the mean value was 22.6.MU.S/cm. The mean NO3'-' and nss-SO4'2-'(non-sea-salt) concentrations of rain in the ocean were 0.11mg/l and 0.15mg/l, respectively, and were about one twentieth of those in the urban area, Okayama of Japan. Rain from 1mm to 3mm was largely affected by the washout effect rather than the rainout effect, and rain more than 4mm was affected largely by the rainout effect rather than the washout effect. From the 5-day long air mass back trajectory analysis, it was found that air mass of rain advected from the central part of the ocean and was not contaminated by anthropogenic acvtivity. (author abst.) |
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