Measurements of hydrogen peroxide and formaldehyde concentrations at ground level and in the high-altitude atmosphere over a rural site in central Japan. Presenting Author: Koichi Watanabe, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, Japan, [email protected] Co-Authors: Mei Jia Jin , Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, Japan Xiao Jing Song, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, Japan Kaede Genmoto, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, Japan Yumeko Ichikawa, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, Japan Saori Kakuyama, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, Japan Chinatsu Yachi , Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, Japan Abstract: Measurements of H 2 O 2 and HCHO concentrations were performed at ground level and in the high-altitude atmosphere using a helicopter over Toyama Prefecture, Japan. The H 2 O 2 and HCHO showed clear seasonal variations with highest concentrations in the summer. The H 2 O 2 was well correlated with the O 3 in July and August whereas there was no correlation between O 3 and H 2 O 2 in May and June. There was a negative correlation between NO X and H 2 O 2 .Significantly high concentrations of H 2 O 2 were observed in the summer when air pollutants were transported from the industrial regions in China. Trans- boundary air pollution may significantly affect harmful influence on vegetation. The concentrations of H 2 O 2 and HCHO at high-altitude were analyzed by a HPLC system within 5-10 minutes after the sampling. The H 2 O 2 over Toyama was lowest at the surface and highest H 2 O 2 was detected at the altitudes of 6,000 and 8,000 ft. On the other hand, the HCHO was highest at ground level. The concentrations of H 2 O 2 were higher than those of SO 2 at high-altitude in the summer, however the H 2 O 2 was usually lower than the SO 2 ; this condition is called oxidant limitation during cold months. If H 2 O 2 concentration rises in cold months, the acidification of cloud water may be accelerated at high elevations in central Japan where air pollution is actively transported. 3.148

3.148 Measurements of hydrogen peroxide and …icacgp-igac2018.colorado.edu/melamed/Abstracts/3.148...Measurements of hydrogen peroxide and formaldehyde concentrations at ground level

Download PDF Report

Upload
others
View
25
Download
0

Embed Size (px)

Citation preview

Page 1: 3.148 Measurements of hydrogen peroxide and …icacgp-igac2018.colorado.edu/melamed/Abstracts/3.148...Measurements of hydrogen peroxide and formaldehyde concentrations at ground level

Measurements of hydrogen peroxide and formaldehyde concentrations at ground level and in the high-altitude atmosphere over a rural site in central Japan.

Presenting Author:Koichi Watanabe, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, Japan, [email protected]

Co-Authors:Mei Jia Jin , Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, JapanXiao Jing Song, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, JapanKaede Genmoto, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, JapanYumeko Ichikawa, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, JapanSaori Kakuyama, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, JapanChinatsu Yachi , Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, Japan

Abstract:

Measurements of H2O2 and HCHO concentrations were performed at ground level and in the high-altitude atmosphere using a helicopter over Toyama Prefecture, Japan. The H2O2and HCHO showed clear seasonal variations with highest concentrations in the summer. The H2O2 was well correlated with the O3 in July and August whereas there was no correlation between O3 and H2O2 in May and June. There was a negative correlation between NOX and H2O2.Significantly high concentrations of H2O2 were observed in the summer when air pollutants were transported from the industrial regions in China. Trans-boundary air pollution may significantly affect harmful influence on vegetation.The concentrations of H2O2 and HCHO at high-altitude were analyzed by a HPLC system within 5-10 minutes after the sampling. The H2O2 over Toyama was lowest at the surface and highest H2O2 was detected at the altitudes of 6,000 and 8,000 ft. On the other hand, the HCHO was highest at ground level. The concentrations of H2O2 were higher than those of SO2 at high-altitude in the summer, however the H2O2 was usually lower than the SO2; this condition is called oxidant limitation during cold months. If H2O2concentration rises in cold months, the acidification of cloud water may be accelerated at high elevations in central Japan where air pollution is actively transported.

3.148

mailto:[email protected]