Clarification of the impact of regional air pollution and trans-boundary air pollution to Japan caused by forest fire in east Siberia

为了弄清西伯利亚森林火灾对西伯利亚区域性空气污染和跨境空气污染对日本的影响，我们利用高时间分辨率(日)采样器对空气污染物进行了观测。与俄罗斯科学院西伯利亚分院林学研究所开展合作研究。我们每年都进行实地考察，讨论如何进行合作研究的细节。气溶胶中离子物种的浓度峰值出现在2005年8月2日。硫酸盐浓度大于4μg/m~3。K~+浓度高是森林火灾的标志，但高K~+浓度仅限于一天，因此可能发生小规模森林火灾。由于没有观测到超过10μg/m^3的硫酸盐，因此排除了跨境空气污染进入日本的可能性。我们分析了EANET在日什里岛、塔皮和佐渡市的二氧化硫连续监测数据。这些采样点都位于…的岸线上更多的日本海，所以他们很容易受到西伯利亚越境空气污染的影响。从4月到6月，除佐渡-关城的4月浓度(6ppbv)外，浓度都极低。7~9月，3个采样点二氧化硫浓度较低。从12月份开始，3个采样点同时观测到高浓度。从1月到3月，有三次观测到二氧化硫浓度超过5ppbv。美国NOAA的反向轨迹分析表明，12月22日和23日在俄罗斯上空有气团输送，但尚不清楚是否由森林大火引起。遗憾的是，我们无法从观测中明确森林火灾对大气的明显影响，但我们可以进行能力建设，以监测西伯利亚地区森林火灾造成的空气污染物。我们能够在西伯利亚建立空气污染物监测系统是一项巨大的贡献，西伯利亚被认为是全球变暖加速导致的森林火灾的危险所在。较少

In order to clarify the impact of regional air pollution in Siberia and trans-boundary air pollution to Japan caused by forest fire in Siberia, we observed the air pollutants utilizing high time resolution (daily) sampler. We conducted cooperative research with Linmological Institute, Russian Academy of Science, Siberian Branch. We made on site visit in every year to discuss how to proceed the detail of cooperative research.The peak concentration of ionic species in aerosol was observed in 2nd August in 2005. Sulfate level exceeded 4μg/m^3. The high concentration of potassium ion is indicative of forest fire, however, the high concentration is restricted only one day, so small forest fire is expected. The possibility of trans-boundary air pollution to Japan is excluded for the larger than 10μg/m^3 of sulfate was not observed.We analysed EANET continuous monitoring data of sulfur dioxide in Rishiri island, Tappi as well as Sado-seki. These sampling sites are all located onshore line of … More Sea of Japan, so they are susceptible to trans-boundary air pollution from Siberia. From April, to June, the concentration is extremely low except for April (6ppbv) in Sado-seki. From July to September, the concentrations of sulfur dioxide are low in 3 sampling sites. From December the high concentrations are observed in 3 sampling sites concurrently. From January to March, larger than 5ppbv of sulfur dioxide were observed three times. The backward trajectory analysis with NOAA in U.S., indicated the transport of air mass over Russia in 22nd and 23rd December, however, it was not clear that it was caused by forest fire or not. Unfortunately, we could not clarify the apparent effect of forest fire in the atmosphere from observation, however, we could make capacity building to monitor the air pollutants caused with forest fire in Siberia area. It is great contribution that we can establish air pollutants monitoring system in Siberia, where is considered the risk of forest fire by accelerated global warming. Less