Long-term trends in the chemical composition of precipitation over western Japan

Shin Ichi Fujita; Akira Takahashi; Hiroshi Hayami; Tatsuya Sakurai

doi:10.1023/A:1013841419733

Long-term trends in the chemical composition of precipitation over western Japan

Shin Ichi Fujita^*, Akira Takahashi, Hiroshi Hayami, Tatsuya Sakurai

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Wet deposition monitoring was conducted at six rural stations in western Japan, during the period from 1987 through 1996. Long-term trends in the concentration of non-sea salt ions were analyzed on the basis of the data obtained. The monitoring results indicated that annual average concentrations of NO₃^- and NH₄⁺ in precipitation significantly increased on the order of 45%, and that of nss-Ca²⁺ and nss-SO₄^2-, concentrations did not change over the past 10 years. The ratio of NO₃^-/nss-SO₄^2- in precipitation significantly increased, the ratio of NO₃^-/NH₄⁺ showed no marked fluctuations, and the ratio of [nss- Ca²⁺+NH₄⁺]/[nss-SO₄^2-+ NO₃^-] slightly increased during the period. These findings suggested that the wet deposition of NO₃^- and NH₄⁺ in western Japan, particularly that in the winter season, was influenced by the long-range transport of nitrogen oxides and ammonia from the Asian continent.

Original language	English
Pages (from-to)	415-420
Number of pages	6
Journal	Water, Air, and Soil Pollution
Volume	130
Issue number	1-4 II
DOIs	https://doi.org/10.1023/A:1013841419733
Publication status	Published - 2001
Externally published	Yes

Keywords

Ammonium
Long-term trend
Nitrate
Western Japan
Wet deposition

ASJC Scopus subject areas

Environmental Engineering
Environmental Chemistry
Ecological Modelling
Water Science and Technology
Pollution

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title = "Long-term trends in the chemical composition of precipitation over western Japan",

abstract = "Wet deposition monitoring was conducted at six rural stations in western Japan, during the period from 1987 through 1996. Long-term trends in the concentration of non-sea salt ions were analyzed on the basis of the data obtained. The monitoring results indicated that annual average concentrations of NO3- and NH4+ in precipitation significantly increased on the order of 45%, and that of nss-Ca2+ and nss-SO42-, concentrations did not change over the past 10 years. The ratio of NO3-/nss-SO42- in precipitation significantly increased, the ratio of NO3-/NH4+ showed no marked fluctuations, and the ratio of [nss- Ca2++NH4+]/[nss-SO42-+ NO3-] slightly increased during the period. These findings suggested that the wet deposition of NO3- and NH4+ in western Japan, particularly that in the winter season, was influenced by the long-range transport of nitrogen oxides and ammonia from the Asian continent.",

keywords = "Ammonium, Long-term trend, Nitrate, Western Japan, Wet deposition",

author = "Fujita, {Shin Ichi} and Akira Takahashi and Hiroshi Hayami and Tatsuya Sakurai",

year = "2001",

doi = "10.1023/A:1013841419733",

language = "English",

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journal = "Water, Air, and Soil Pollution",

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TY - JOUR

T1 - Long-term trends in the chemical composition of precipitation over western Japan

AU - Fujita, Shin Ichi

AU - Takahashi, Akira

AU - Hayami, Hiroshi

AU - Sakurai, Tatsuya

PY - 2001

Y1 - 2001

N2 - Wet deposition monitoring was conducted at six rural stations in western Japan, during the period from 1987 through 1996. Long-term trends in the concentration of non-sea salt ions were analyzed on the basis of the data obtained. The monitoring results indicated that annual average concentrations of NO3- and NH4+ in precipitation significantly increased on the order of 45%, and that of nss-Ca2+ and nss-SO42-, concentrations did not change over the past 10 years. The ratio of NO3-/nss-SO42- in precipitation significantly increased, the ratio of NO3-/NH4+ showed no marked fluctuations, and the ratio of [nss- Ca2++NH4+]/[nss-SO42-+ NO3-] slightly increased during the period. These findings suggested that the wet deposition of NO3- and NH4+ in western Japan, particularly that in the winter season, was influenced by the long-range transport of nitrogen oxides and ammonia from the Asian continent.

AB - Wet deposition monitoring was conducted at six rural stations in western Japan, during the period from 1987 through 1996. Long-term trends in the concentration of non-sea salt ions were analyzed on the basis of the data obtained. The monitoring results indicated that annual average concentrations of NO3- and NH4+ in precipitation significantly increased on the order of 45%, and that of nss-Ca2+ and nss-SO42-, concentrations did not change over the past 10 years. The ratio of NO3-/nss-SO42- in precipitation significantly increased, the ratio of NO3-/NH4+ showed no marked fluctuations, and the ratio of [nss- Ca2++NH4+]/[nss-SO42-+ NO3-] slightly increased during the period. These findings suggested that the wet deposition of NO3- and NH4+ in western Japan, particularly that in the winter season, was influenced by the long-range transport of nitrogen oxides and ammonia from the Asian continent.

KW - Ammonium

KW - Long-term trend

KW - Nitrate

KW - Western Japan

KW - Wet deposition

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DO - 10.1023/A:1013841419733

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SN - 0049-6979

VL - 130

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JO - Water, Air, and Soil Pollution

JF - Water, Air, and Soil Pollution

IS - 1-4 II

ER -

Long-term trends in the chemical composition of precipitation over western Japan

Abstract

Keywords

ASJC Scopus subject areas

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