Fog Water, Throughfall, and Bulk Precipitation Chemistry and a Newly Developed Methodology for the Estimation of Fog Water Deposition

Abe, Mitsuko; Oniwa, Sho; Okochi, Hiroshi; Aikawa, Masahide

doi:10.1007/s11270-022-05939-5

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…One of the possibilities peculiar to the Sarakura site that could explain the larger dilution of the NH 3 concentration in the atmosphere is the foggy condition due to the high elevation of the Sarakura site. Abe et al (2022) showed that air pollutants were highly concentrated in the fog water collected at the same site as this study (Sarakura). A wet deposition process is related with scavenging of ambient NH 3 (Roy et al 2021).…”

Section: Nhsupporting

confidence: 50%

Evaluation of atmospheric conditions at a quasi-national park adjacent to the downtown of a highly industrialized Japanese city

Abe,

Oniwa,

Imazu

et al. 2024

Preprint

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The atmospheric condition at the quasi-national park adjacent to the downtown of a highly industrialized city was evaluated based on three-site observations (quasi-national park, downtown, and suburbs). The concentrations of NOx, NO, NO2, O3, SO2, and NH3 were determined. The NOx and NO2 concentrations at the quasi-national park were lower and higher than those downtown and in the suburbs, respectively. The O3 concentration at the quasi-national park was higher than that downtown and equivalent to that in the suburbs, indicating that the impact of O3 air pollution on plants and the forest ecosystem is potentially more severe at the quasi-national park than downtown. Potential ozone (PO), defined as \(\text{P}\text{O}={\text{O}}_{3}+{\text{N}\text{O}}_{2}-0.1\times \text{N}\text{O}\text{x}\), showed no statistically significant difference (p<0.05) among the three sites, indicating that the nitric oxide titration operated and controlled the O3 concentration across the entire city. The definite difference in the level among the three sites in the SO2 concentration strongly implied the large contribution of sulfur supply from stationary emission sources and ships located along the shoreline. Fog events at the quasi-national park could be attributed to the determination of the NH3 concentration at the quasi-national park, i.e., the effective scavenging of NH3 from the ambient air by fog water.

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Section: Nhsupporting

confidence: 50%

Evaluation of atmospheric conditions at a quasi-national park adjacent to the downtown of a highly industrialized Japanese city

Abe,

Oniwa,

Imazu

et al. 2024

Preprint

Self Cite

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Long term trends of dry and wet deposition of air pollutants at declining forest site of Mt. Oyama in Japan during 1994–2019

Wang

Okochi

Igawa

2023

Water Air Soil Pollut

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Forest decline, which occurs in mountainous regions in many countries, may result from the effects of acid fog, ozone, or deposition of other pollutants. We observed wet deposition of air pollutants at different altitudes on Mt. Oyama, situated southwest of Tokyo, for 1994 until 2019. During this period, the domestic atmospheric environment was improved in Japan. The average concentration of air pollutants around all the sampling sites on Mt. Oyama decreased by 63.01%, 32.08%, 8.80%, and 39.73% for NH3, HCl, HNO3, and SO2, respectively. The volume weighted mean (VWM) pH values showed an increasing trend for bulk deposition (+0.70% y-1), fog water (+2.58% y-1), and throughfall (+2.60% y-1). Stemflow also increased (cedar, +1.17% y-1; fir, +0.82% y-1), although it included organic acids dissolved from the stem and it primarily had a low VWM pH value. The overall pH value of the fog water increased at the site, although acidic fog was still observed. Comparing fog water between winter and summer, a significant increase in pH occurred in summer, whereas no change occurred in winter. In summer, the sources of pollutants at Mt. Oyama are mainly from mainland Japan, and the frequency of low-pH acidic fog decreased annually. In winter, Mt. Oyama was affected by transboundary pollution, and acid fog occasionally occurred. Improvements in the domestic atmospheric environment and control of transboundary pollution will provide better conditions for mountain ecology that are free from acidic pollutants.

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Fog Water, Throughfall, and Bulk Precipitation Chemistry and a Newly Developed Methodology for the Estimation of Fog Water Deposition

Cited by 2 publications

References 21 publications

Evaluation of atmospheric conditions at a quasi-national park adjacent to the downtown of a highly industrialized Japanese city

Evaluation of atmospheric conditions at a quasi-national park adjacent to the downtown of a highly industrialized Japanese city

Long term trends of dry and wet deposition of air pollutants at declining forest site of Mt. Oyama in Japan during 1994–2019

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