珠海空气中可吸入颗粒物(PM10)的时空变化特征

选取2000年6月-2001年5月珠海空气中PM10的观测数据,分析其在3个监测点(香洲、前山和吉大)的时空演变特征.结果表明,珠海PM10的年均质量浓度为40 μg/m\+3(校正后为52 μg/m\+3),低于国家PM10的二级质量标准,与国内外其他城市相比,珠海PM10相对较低,表明珠海的大气颗粒物污染轻微.2001年4月14,15日珠海PM10日均值显著增高,达到92,127 μg/m\+3,对比香港及北方粉尘源区的颗粒物浓度及气团轨迹分析结果可知,珠海也受到了北方沙尘暴的影响.3个站点的PM10月均质量浓度变化主要表现为夏、秋季低,冬、春季高.珠海市大气PM10的日变化形式以白天高、夜晚低为主. 

Spatial-Temporal Variations of Atmospheric PM10 over Zhuhai

Observational data of atmospheric PM₁₀ in Zhuhai city from June 2000 to May 2001 was chosen to analyze the spatial and temporal variation characteristic of PM₁₀ in 3 monitoring stations (Xiangzhou,Qianshan and Jida).It was shown that the annual average PM₁₀ concentration was 40 μg/m\+3 (the corrected mass concentration is 52 μg/m\+3),which did not exceed the Class II category of the National Ambient Air Quality Standards in China.Compared with other cities in the world,the atmospheric PM₁₀ pollution in Zhuhai is slighter.The daily PM₁₀ concentrations monitored in Zhuhai reached the peak values,being 92 and 127 μg/m\+3 on April 14 and 15,2001 respectively.In comparison with the particulate matter concentrations of Hong Kong(nearby) and Yulin station (at the Asian Dust Source Regions),the high PM₁₀ values occurred at Zhuhai and Hong Kong in-phase.This as well as the results of trajectory analysis implied that Northern China dust storms were transported to Zhuhai.The monthly concentrations of PM₁₀ at three stations are at low level in the summer and fall periods and at high level in the winter and spring periods.The daily PM₁₀ concentration is mostly high in the daytime and low at night.