High frequency and large deposition of acid fog on high elevation forest

Manabu Igawa, Ko Matsumura, Hiroshi Okochi

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

We have collected and analyzed fogwater on the mountainside of Mt. Oyama (1252 m) in the Tanzawa Mountains of Japan and observed the fog event frequency from the base of the mountain with a video camera. The fog event frequency increased with elevation and was observed to be present 46% of the year at the summit. The water deposition via throughfall increased with elevation because of the increase in fogwater interception and was about twice that via rain at the summit, where the air pollutant deposition via throughfall was several times that via rainwater. The dry deposition and the deposition via fogwater were dominant factors in the total ion deposition at high elevation sites. In a fog event, nitric acid, the major acid component on the mountain, is formed during the transport of the air mass from the base of the mountain along the mountainside, where gases including nitric acid deposit and are scavenged by fogwater. Therefore, high acidity caused by nitric acid and relatively low ion strength are observed in the fogwater at high elevation sites.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalEnvironmental Science and Technology
Volume36
Issue number1
DOIs
Publication statusPublished - 2002 Jan 1
Externally publishedYes

Fingerprint

Fog
fog
Nitric Acid
nitric acid
Nitric acid
Acids
mountain
acid
throughfall
ion
Ions
dry deposition
interception
Air Pollutants
rainwater
air mass
acidity
Video cameras
Air
Acidity

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

High frequency and large deposition of acid fog on high elevation forest. / Igawa, Manabu; Matsumura, Ko; Okochi, Hiroshi.

In: Environmental Science and Technology, Vol. 36, No. 1, 01.01.2002, p. 1-6.

Research output: Contribution to journalArticle

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