Research on air pumping effects over central Japanese Alps in summer

日本中部阿尔卑斯山夏季空气抽吸效应研究

基本信息

批准号：
13680601
负责人：
OSADA Kazuo
金额：
$ 2.37万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

Air pumping effects over mountain areas are caused by solar heating of the mountain slope. The air pumping effect may inject significant amount of polluted air into the free-troposphere over Japan. To characterize the air pumping effect over the central Japanese Alps, we conducted in-situ measurements on atmospheric aerosol particles, ozone, and radon concentrations with meteorological parameters at Mt.Norikura during the study period of 2001 and 2002. We observed column amount and vertical distribution of aerosols by using a sky-radiometer and a ceilometer. Size-segregated aerosol particles for chemical analysis were also sampled during intensive observation periods during summer and early fall.Under the clear sky conditions in summer, polluted air from mountain valley area is lifted up about 4km of altitude (1km above the mountain top) over Mt.Norikura. The ratio of aerosol volume concentration for daytime (polluted valley wind) to nighttime (clean free-tropospheric) conditions was about 10. The air pumping effects over central Japanese Alps carry about 10 time higher concentration of aerosols to the free-troposphere over Japan in summer. Under the high pressure system centered over the northwest Pacific in typical summer condition, backward air trajectories were originated from the northwest Pacific to Mt.Norikura and forward trajectories returned to the north Pacific with some deviations to east Russia and the Kurile Islands. The air pumping effects over mountain area provide a strong pollution source mechanism to the free-troposphere over the western Pacific region including east Asia.

山区的空气泵效应是由太阳能加热山坡引起的。空气抽水效应可能会在日本的自由球圈中注入大量污染的空气。为了表征日本中部阿尔卑斯山上的空气泵送效果，我们在2001年和2002年的研究期间，在Mt.Norikura的气象参数上进行了大气中的气溶胶颗粒，臭氧和ra浓度的原位测量。我们观察到了柱量和垂直使用天空光度计和天花板分布气溶胶。在夏季和初秋的密集观察期间，还采样了尺寸分离的气溶胶颗粒。 Mt.Norikura。白天（污染山谷风）与夜间（干净的自由层）条件的气溶胶体积浓度的比率约为10。日本中部阿尔卑斯山的空气抽水效应载有大约10次的气溶胶浓度更高。夏天。在典型的夏季状况下以西北太平洋为中心的高压系统下，向后的空气轨迹起源于西北太平洋到诺里库拉山，前进轨迹返回北太平洋，有些偏离东俄罗斯和库里里尔群岛。山区的空气抽水效应为包括东亚在内的西太平洋地区的自由球圈提供了强大的污染源机制。