摘要
利用电脑微激光粉尘仪对西安市南二环2013年春季5月70 m高度范围内的可吸入颗粒物(PM_(10))质量浓度进行了4个昼夜的监测。观测发现,西安南二环PM_(10)质量浓度昼夜变化可分为5个阶段:第1阶段在8:00—10:00,PM_(10)平均质量浓度范围0.056 mg/m^3;第2阶段在12:00—14:00,PM_(10)平均质量浓度为0.075 mg/m^3;第3阶段在16:00—18:00,PM_(10)平均质量浓度为0.058 mg/m^3;第4阶段在20:00—22:00,PM_(10)平均质量浓度为0.070 mg/m^3;第5阶段在0:00—6:00,PM_(10)平均质量浓度为0.038 mg/m^3。高分辨率地垂向观测结果表明,西安5月PM_(10)质量浓度垂向变化可分为3种类型:第1种类型,随着高度的增加PM_(10)质量浓度增加幅度居中,平均递增率为0.048μg/m;第2种类型,随着高度的增加PM_(10)质量浓度幅度增加最大,递增率为0.065μg/m,且波动变化明显;第3种类型,随着高度的增加PM_(10)质量浓度增加幅度最小,递增率为0.013μg/m。西安南二环5月PM_(10)质量浓度在1 m高度处最低,平均为0.048 mg/m^3;4~46 m高度范围内质量浓度较低,平均为0.051 mg/m^3;在49~67m高度范围内质量浓度较高,平均为0.052 mg/m^3;在70m处最高,平均为0.056 mg/m^3。观测期间PM_(10)质量浓度与4 m处的温度之间为显著正相关(y=240.73x+12.305),与4、7、10 m高度处的湿度为显著负相关(y=-606.42x+82.08)。
The concentrations of PMt0 within the 70 m height range at the South Second Ring of Xi＇an were monitored for 4 days and nights in May 2013 by a microcomputer laser dust monitor. The results show that PM10 concentration varied in 5 phases of the day. The first phase was at am 8：00-10：00, with an average concentration of 0.056 mg/m3. The second was at 12：00-14：00, with an average concentration of 0.075 mg/m3. The third was at pm 16：00-18：00, with an average concentration of 0.058 mg/m3. The fourth was at 20：00-22：00, with an average concentration of 0.070 mg/m3. The fifth, one was in the night of 0：00-6：00, with an average concentration of 0.038 mg/m3. High resolution vertical observations indicate that Xian vertical variation of PM^o concentrations can be divided into three types in May. The first type decreases as altitude increases PM10 concentration increases was middle, the average increase rate for 0.048 μg/m. The second type as the altitude increases PM10 concentration was the highest increase rate for 0.065 μg/ m and volatile changes significantly. The third type as the height increases PM10 concentration was the lowest and the increase rate for 0.013 μg/m. At the height of 70 m the mass concentration of PM10 was the highest, the mean value being 0.56 mg/m3; the concentration at lm height was the lowest, the average concentration being 0.048 mg/m3. In the range of 4-46 m height, the PM10 mass concentration was the second lowest, with an average concentration of 0.051 mg/m3. In the scope of 49-67 m, the PM10 mass concentration was the second highest, with an average concentration of 0.052 mg/m3, which presented a remarkable increasing trend. During the observation period, the mass PM10 concentration and the temperature had a marked positive correlation at the height of 4 m （Correlation formula is y=240.73x＋12.305）. The mass PM10 concentration and the humidity had a marked negative correlation at the heights of 4, 7, and 10 m （Correlation formula is y=-6.0668x＋0.821）.
出处
《科技导报》
CAS
CSCD
北大核心
2015年第9期18-24,共7页
Science & Technology Review
基金
国家自然科学基金重点项目(NSFC41230641)
中国科学院战略性先导科技专项(XDB05060500)
