The Variation Characteristics and Influencing Factors of Surface Ozone Concentration in the Taklimakan Desert Hinterland
Based on the automatic continuous observation data of surface ozone concentration from June 10, 2010 to March 20, 2012 in the Takiimakan Desert hinterland, and combining with the corresponding meteorological data, the variation characteristics of surface ozone concentration at scales of day, week, month, season and the daily variation under different weather conditions were analyzed, the main factors affecting the ozone concentration variation were discussed too. Results showed that: (1) The daily variation of hourly mean ozone concentration was characterized by single peak with gentle changes during the night and dramatic changes during the day. The lowest concentration was at 09:00 and the highest was at 18:00. Comparing with other cities, the time delayed. (2) Ozone concentration variation has a weekend effect phenomenon. The daily mean ozone concentration decreased from Monday to Wednesday with the lowest in Wednesday, and increased after Thursday with the highest in Sunday. (3) The highest monthly average concentration was 89. 6 μg·m-3 in June of 2010, and the lowest was 32. 0 μg· m-3 in January of 2012. The ozone concentration reduced month by month from June to December in 2010. (4) Ozone concentration in spring and summer was higher than in autumn and winter. The variation trend agreed with other large and medium-sized cities. (5) Under four different kinds of weather conditions, the ozone concentration varied the most dramatically in sunny day, followed by in little rain day, and varied gently in cloudy day. The ozone concentration varied inconspicuously before sandstorm, and dropped rapidly when sandstorm began. (6) The daily variation of radiation was also characterized by single peak, and the variation was significantly earlier than the ozone concentration variation. The sun radiation intensity had a direct influence on the photochemical reaction speed, further, leading to the variation of ozone concentration. (7) The daily mean ozone concentration in dust weather was higher than that in little rain day and sun day. The variation of surface ozone concentration could also be affected by the meteorological factors such as relative humidity, wind speed, the direction of the wind and the sunshine hours. So many factors together led to ozone pollution.
NETL
NSTL
万方数据
维普
