Episodic pollution of photochemical ozone during 8-9 May 2007 over Japan: Observational data analyses
Episodic pollution of photochemical ozone during 8-9 May 2007 over Japan: Observational data analyses
复制标题
2007年5月8日至9日日本上空光化学臭氧的偶发性污染：观测数据分析
DOI：
10.11298/taiki1995.43.225
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
A. Shimizu
中科院分区：
文献类型：
--
作者：
M. Hayasaki;T. Ohara;J. Kurokawa;I. Uno;A. Shimizu
5月8日，臭氧从位于日本最西部的后藤群岛开始增加。隐岐的臭氧日最大值出现在半夜。臭氧浓度的峰值时间沿日本海沿岸向东沿着滞后。在偏远岛屿，二氧化硫和颗粒物浓度与臭氧同时变化。激光雷达观测得到的人为气溶胶的后向轨迹分析和垂直廓线表明，污染气团是从亚洲大陆输送过来的。5月9日，高浓度臭氧主要出现在日本东部。与前一天一样，臭氧日最大值出现的时间沿着日本海沿岸向东滞后。另一方面，时间滞后向北到关东平原的内部和臭氧浓度高于前一天。污染物的时空变化和气象条件表明，海陆风环流的形成积累了东京首都圈周围的城市空气污染物。这些结果表明，日本的高浓度臭氧是由来自亚洲大陆的跨界空气污染物造成的，国内城市空气污染物加剧了大都市地区的污染水平。
On 8 May ozone increase started from Goto islands, which is located in a westernmost part of Japan. The daily maximum ozone in Oki was observed in the middle of the night. The peak time of ozone concentration lagged eastward along the coast of the Japan Sea. In remote islands, sulfur dioxide and particulate matter concentrations varied simultaneously with ozone. Backward trajectory analyses and vertical profiles of anthropogenic aerosols obtained by Lidar observation showed that polluted air-mass was transported from the Asian continent. On 9 May high concentration of ozone was mainly found over eastern Japan. As in the preceding day, the time of daily maximum ozone lagged eastward along the coast of the Japan Sea. On the other hand, the time lagged northward to the interior of the Kanto Plain and ozone concentration was higher than that of the preceding day. Spatial and temporal variation of pollutants and meteorological conditions suggested that formation of land-sea breeze circulation accumulated urban air pollutants around the Tokyo metropolitan area. These results showed that high concentration of ozone in Japan was caused by trans-boundary air pollutants originating from the Asian continent and domestic urban air pollutants enhanced the pollution level in the metropolitan area.
H.264编码器DCT的硬件实现及其评估
DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
Choong Geun Lee;V. G. Moshnyaga and K. Hashimoto;宮田康治
通讯作者：
宮田康治