摘要
利用塔克拉玛干沙漠腹地塔中地区2010年6月10日—2012年3月20日地表臭氧浓度连续自动观测数据,结合相应气象要素资料,对地表臭氧质量浓度的日、周、月、季节变化与不同天气条件下日变化特征进行了分析,同时探讨了影响臭氧浓度变化的主要因素。结果表明:①臭氧浓度日变化具有明显的单峰型日变化规律,夜间变化平缓,白天变化剧烈。09:00前后达到最低值,18:00前后达到最高值,出现时间稍迟于其他城市地区。②臭氧浓度变化具有"周末效应"现象。最高值出现在星期日,最低值出现在星期三;星期一至星期三浓度逐渐降低,星期四又逐渐上升。③最高月平均浓度出现在2010年6月,其浓度为89.6μg.m-3,最低月平均浓度出现在2012年1月,其浓度为32.0μg.m-3,2010年6—12月,浓度逐月降低。④春、夏季臭氧浓度较高,秋季和冬季明显低于春季和夏季,与大中型城市变化特征基本一致。⑤臭氧浓度日变化最剧烈的是晴天,其次为小雨天气,阴天日变化平缓。沙尘暴出现前,臭氧小时平均浓度变化较小,沙尘暴开始时浓度下降,且下降速度较快。⑥辐射变化也具有单峰型日变化规律,臭氧浓度变化明显晚于辐射变化,太阳辐射的强弱直接影响光化学反应速度,从而导致臭氧浓度的变化。⑦沙尘天气臭氧日平均浓度高于有间隙小雨天气和晴天。相对湿度、风速、风向、日照日数同时影响近地面臭氧浓度的变化,臭氧污染的发生是多种因素共同作用的结果。
Based on the automatic continuous observation data of surface ozone concentration from June 10, 2010 to March 20, 2012 in the Taklimakan 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 dramat- ic 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 89.6μg·m^-3 in June of 2010, and the lowest was 32.0 μg·m^-3 in January of 2012. The ozone concen- tration 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 concen- tration 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.
出处
《中国沙漠》
CSCD
北大核心
2013年第2期626-633,共8页
Journal of Desert Research
基金
国家自然科学基金项目((41175017
41175140)
公益性行业(气象)科研专项项目(GYHY201006012
GYHY201106025)资助
关键词
臭氧浓度
沙尘天气
气象因子
塔克拉玛干沙漠
ozone concentration
dust weather
meteorological factor
Taklimakan Desert
