中国环境科学
中國環境科學
중국배경과학
CHINA ENVIRONMENTAL SCIENCE
2014年
8期
1972-1978
,共7页
王羽琴%张元勋%张阳%李正强%何凌燕%黄晓锋
王羽琴%張元勛%張暘%李正彊%何凌燕%黃曉鋒
왕우금%장원훈%장양%리정강%하릉연%황효봉
PM2.5%含碳气溶胶%元素碳示踪法%后向轨迹
PM2.5%含碳氣溶膠%元素碳示蹤法%後嚮軌跡
PM2.5%함탄기용효%원소탄시종법%후향궤적
PM2.5%carbonaceous aerosols%elemental carbon tracer method%backward trajectory clustering model
2011年8月12~24日,深圳市成功举办了第26届世界大学生运动会.为保证空气质量,两个观测点的PM2.5(空气动力学直径≤2.5μm的大气颗粒物)质量浓度均值分别为(12.99±3.73)μg/m3和(25.24±5.20)μg/m3.然而,8月24日(含)大运会结束、主要污染控制措施取消之后,PM2.5的质量浓度呈现台阶式突增,测得观测点所处位置PM2.5分别为(48.01±8.73)μg/m3和(54.05±6.53)μg/m3.为探讨大气颗粒物污染水平变化的原因,对大运会结束前后深圳市大气含碳气溶胶的变化特征进行了分析,利用元素碳示踪法对大运会结束前后的一次和二次含碳气溶胶污染水平进行估算,结果显示大运会结束后的2个观测点的一次有机碳估算浓度较大运会期间增长了55%和22%,二次有机碳分别增长了442%和169%.结合气象因素及后向轨迹聚类模型的分析结果,认为在大运会结束后的大气颗粒物浓度阶梯状增加的原因除本地污染累积外,污染气团远距离传输以及气象条件都对阶梯型污染有一定的贡献.
2011年8月12~24日,深圳市成功舉辦瞭第26屆世界大學生運動會.為保證空氣質量,兩箇觀測點的PM2.5(空氣動力學直徑≤2.5μm的大氣顆粒物)質量濃度均值分彆為(12.99±3.73)μg/m3和(25.24±5.20)μg/m3.然而,8月24日(含)大運會結束、主要汙染控製措施取消之後,PM2.5的質量濃度呈現檯階式突增,測得觀測點所處位置PM2.5分彆為(48.01±8.73)μg/m3和(54.05±6.53)μg/m3.為探討大氣顆粒物汙染水平變化的原因,對大運會結束前後深圳市大氣含碳氣溶膠的變化特徵進行瞭分析,利用元素碳示蹤法對大運會結束前後的一次和二次含碳氣溶膠汙染水平進行估算,結果顯示大運會結束後的2箇觀測點的一次有機碳估算濃度較大運會期間增長瞭55%和22%,二次有機碳分彆增長瞭442%和169%.結閤氣象因素及後嚮軌跡聚類模型的分析結果,認為在大運會結束後的大氣顆粒物濃度階梯狀增加的原因除本地汙染纍積外,汙染氣糰遠距離傳輸以及氣象條件都對階梯型汙染有一定的貢獻.
2011년8월12~24일,심수시성공거판료제26계세계대학생운동회.위보증공기질량,량개관측점적PM2.5(공기동역학직경≤2.5μm적대기과립물)질량농도균치분별위(12.99±3.73)μg/m3화(25.24±5.20)μg/m3.연이,8월24일(함)대운회결속、주요오염공제조시취소지후,PM2.5적질량농도정현태계식돌증,측득관측점소처위치PM2.5분별위(48.01±8.73)μg/m3화(54.05±6.53)μg/m3.위탐토대기과립물오염수평변화적원인,대대운회결속전후심수시대기함탄기용효적변화특정진행료분석,이용원소탄시종법대대운회결속전후적일차화이차함탄기용효오염수평진행고산,결과현시대운회결속후적2개관측점적일차유궤탄고산농도교대운회기간증장료55%화22%,이차유궤탄분별증장료442%화169%.결합기상인소급후향궤적취류모형적분석결과,인위재대운회결속후적대기과립물농도계제상증가적원인제본지오염루적외,오염기단원거리전수이급기상조건도대계제형오염유일정적공헌.
The 26th UNIVERSIADE, and event that (briefly describe, including PM2.5 controls that were put in place) was successfully held in Shenzhen during Aug.12th ~ 24th, 2011. Monitored PM2.5 (aerodynamic diameter≤2.5μm) mass concentrations measured (12.99±3.73) μg/m3 and (25.24±5.20) μg/m3 at two selected sampling sites. However, significant increase in PM2.5 mass appeared after the UNIVERSIADE, when the control measures were terminated. At this time, PM2.5 mass concentrations were (48.01±8.73) μg/m3 and (54.05±6.53) μg/m3, respectively. In this study, elemental carbon was used as a tracer to estimate the contamination levels of primary and secondary carbonaceous aerosols both during and after the UNIVERSIADE event. Results show that primary organic carbon post-UNIVERSIADE increased by 55%and 22% and the secondary organic carbon increase by 442% and 169% at the two sites, respectively. Considering meteorological factors and backward trajectory clustering modeling, both long-distance particle transportation and local contamination accumulation contribute to the air quality degradation, among which secondary atmospheric reactions might be the major factor leading to the observed PM2.5 increase.
