Observational study of atmospheric chemistry in the free troposphere in relation to large-scale vertical mixing and diffusion

在山上进行了两次密集的大气化学活动观测。富士气象站(海拔3776米)和太鲁堡(海拔1300米)位于山坡上。富士约两周；2003年5月26日至2003年6月13日和2002年9月11日至2002年9月24日。为了研究与空气质量变化耦合的化学过程，观测是在平流和对流活跃的季节进行的。因此，分别用高空气团和边界层气团的示踪剂观测到了^7Be和^&lt；222&Gt；Rn。其他观测物种还包括SO_2、CO、O_3、CO_2、雨雾水中的离子组分、气溶胶数和气溶胶化学组分等。此外，在密集观测的间隔时间内，可以获得许多化学物种的连续数据。~(7)Be浓度夏季低，春、秋季高。这是季节性的PAT…更多的TERN可以归因于大气高层大气质量输送的季节变化。另一方面，放射性核素的浓度水平较低，季节变化相对较小。这种季节性模式目前似乎很难解释。这是这两个物种第一次在日本上空的自由对流层获得年度数据。富士山峰顶SO2浓度呈现冬高夏低的季节变化规律。进一步揭示了冬季亚洲大陆的低气压输送是一次远距离输送。当输运发生时，SO2、CO和^&lt；222&Gt；Rn一起被输送，因此推测它们来自一个共同的源域。只有一次来自三宅岛的SO2烟羽在山顶被捕获。这一异常事件可能是由于本州南部沿海的一些对流活动加上东南风造成的。三宅岛的羽流似乎通常达不到富士山的高度。较少

Intensive campaign observation for atmospheric chemistry was carried out twice at the Mt. Fuji Weather Station (altitude of 3776m), and Tarou-bou (altitude of 1300m) located at a hillside of Mt. Fuji for about two weeks; during May 26, 2003 to June 13, 2003 and during September 11, 2002 to September 24, 2002. In order to investigate chemical processes coupled with air mass change, the observation was carried out in the season when the advection and the convection are active. Therefore, ^7Be and ^<222>Rn were observed with an assignment of a tracer of the upper air mass and boundary layer air mass, respectively. Other observed species include SO_2, CO, O_3, CO_2, ionic components in rain and fog water, the aerosol number and aerosol chemical components, etc. Moreover, the period between the intensive observations, the continuous data of many chemical species could be acquired. Regarding ^7Be concentration, it was found to be low in summer and high in spring and autumn. This seasonal pat … More tern is attributable to the seasonal variation of the air mass transport from the upper level of the atmosphere. On the other hand, ^<222>Rn had a low concentration level and exhibited a relatively small seasonal change. This seasonal pattern seems to difficult to explain at present. This is the first occasion for both species that annual data were acquired in the free troposphere over Japan. The concentration of SO_2 at the summit of Mt.Fuji showed a seasonal pattern of high in winter and low in summer. It was further revealed that a long-range transport occurs with a passage of a low pressure in winter from the Asian continent. When the transport occurred, SO_2, CO, and ^<222>Rn are transported altogether, thus it was suggested that they were originated from a common source domain. Only once SO_2 plume from Miyake-jima was captured at the summit. This anomalous event may be due to some convective activities off the Honshu southern coast coupled with a southeasterly wind. It seems that the Miyake-jima plume usually does not reach to the altitude of Mt.Fuji. Less