【摘 要】
：
本文根据2014 年10 月珠江三角洲中西部大气边界层观测资料,研究了大气边界层结构对空气质量的影响.并对比分析了郊区下垫面的南海与城市下垫面的顺德的大气边界层特点.
【机 构】
：
北京师范大学环境学院,北京100875
【出 处】
：
第21届中国大气环境科学与技术大会暨中国环境科学学会大气环境分会2015年学术年会
论文部分内容阅读
本文根据2014 年10 月珠江三角洲中西部大气边界层观测资料,研究了大气边界层结构对空气质量的影响.并对比分析了郊区下垫面的南海与城市下垫面的顺德的大气边界层特点.研究得到如下结论：1.冷空气期间大风有利于污染物清除.冷空气过后回暖期易出现污染现象,回暖期持续小风静风有利于污染物堆积.持续性的强降水过程可以有效清洁大气,快速改善空气质量.珠江三角洲常常受到高压脊控制,脊内回流,风速偏小,污染物输送能力弱,易出现空气污染现象.2.污染日的主导风向为东北风,清洁日的主导风向为东南风.来自海上的洁净的东南风有利于污染物的输送和稀释.风速的时空分布有一定的特点.风速随高度升高而增大；白天11 时至19 时相对于夜间,整体风速较小,风速梯度较小,且出现比较深厚的小风层.对比污染日与清洁日,普遍来说污染日出现小风层高度更高,持续时间更长,风速梯度更小；对比城市与郊区,郊区整体风速更大.3.贴地逆温的出现非常不利于大气污染物的垂直向上扩散,导致空气质量恶化.污染日贴地逆温的出现频率、厚度大于清洁日.郊区贴地逆温的出现频率、厚度大于城市.4.郊区边界层高度与城市相差不大,清洁日大体高于污染日.南海AQI 与边界层高度相关系数为-0.479,通过置信度为95％的显著性检验,顺德AQI 与边界层高度相关系数为-0.26,未能通过置信度为95％的显著性检验.郊区边界层通风量明显高于城市,清洁日普遍高于污染日.南海AQI 与通风量良好的负相关关系,相关系数达-0.504,通过了置信度为95％的显著性检验.顺德AQI 与通风量相关系数为-0.276,未通过置信度为95％的显著性检验.郊区和城市的通风量差异比大气边界层厚度差异更加明显.
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