Measurement of ozone in sub-high mountain area where serious forest decline is seen

在山上可以看到严重的森林衰退。在奥库-日光的Shirane。不仅针叶树受损，落叶树也受损。我们认为光化学臭氧或过氧物是由臭氧与森林树木排放的天然碳氢化合物反应而形成的。因此，我们测量了森林退化严重的亚高山地区的臭氧和/或过氧化物浓度。靠近高山的山顶是不可能利用电力供应的。因此，我们使用了便携式臭氧传感器(固定电位电解槽)，由汽车电池和太阳能电池板驱动。数据存储在一个小型数据记录器中，观测点位于山顶附近。Mae-Shirane由于只有一间无人居住的山间小屋，我们必须肩上扛着仪器和食物到达观测点。幸运的是，一个名为“拯救日益衰落的森林”的志愿者组织的人们帮助了我们。MAE-Shirane分别于1997年8月初、1998年8月初和1999年8月初制作，为期约10天。在1997年和1998年的试验中，整个时期的天气都很糟糕，没有获得值得分析的数据。在1999年的实验中，好天气持续了实验期的前半段。臭氧浓度高达90pptv。在同一时期，国家环境研究所的Oku-Nikko环境观测站测量了过氧化氢和甲基过氧化氢等过氧化氢的浓度。白天过氧化氢浓度与臭氧浓度、日照时间、异戊二烯浓度有较好的相关性。

Serious forest decline is seen around Mt. Shirane in Oku-Nikko. Not only coniferous trees but also deciduous trees are damaged. We thought that photochemical ozone or peroxides formed by the reactions of ozone with natural hydrocarbons emitted by forest trees. Thus, we measured the concentrations of ozone and/or peroxides in the sub-high mountain area where serious forest decline is observed. Near the top of high mountains it is impossible to utilize electric power supply. Therefore, we used a portable ozone sensor (a fixed potential electrolysis cell) driven with car batteries and solar panels. Data were stored in a small data-logger.Observation site was located near the top of Mt. Mae-Shirane. Since there is only an uninhabited mountain hut, it was necessary to carry instruments as well as foods on our shoulder up to the observation site. Fortunately, people of a volunteers group named "the group for saving declining forests" helped us.Observations of ozone near the top of Mt. Mae-Shirane were made in early August of 1997, 1998, and 1999 for about 10 days, respectively. In 1997 and 1998 experiments the weather was so bad for whole period that no data worth for analysis was obtained. In the 1999 experiment, good weather lasted in the former half of the experimental period. Ozone reached up to 90 pptv. At the same period concentrations of peroxides such as hydrogen peroxide and methyl hydroperoxide were measured in the Oku-Nikko Environment Observation Station of NIES. The concentration of hydrogen peroxide in the daytime showed a good correlation with ozone concentration, sunlight, and isoprene concentration.