2014年冬季珠三角区域典型城市PM 2.5 污染时空关联特征

Q2 Environmental Science 环境科学研究 Pub Date : 2017-01-25 DOI:10.13198/j.issn.1001-6929.2017.01.13

詹鹃铭, 刘永红, 林琳, 丁卉, 徐伟嘉

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引用次数: 1

Abstract

为探讨冬季珠江三角洲（下称珠三角）区域污染物的空间传输延迟性及其与气象、地理的关联性，利用2014年12月1日-2015年1月9日天气图、珠三角区域4个典型城市——韶关、广州、深圳、香港的地面气象数据及ρ（PM2.5），采用时间序列、相关性分析等方法，分析了2014年冬季各城市大气ρ（PM2.5）变化关联特征以及受天气过程的影响.结果表明：在研究时段内，受11次冷空气南下和3次西南暖湿气流控制的典型天气过程影响，4个典型城市的ρ（PM2.5）小时均值、日均值的时间序列变化趋势具有一致性，并且4个城市间的ρ（PM2.5）相关性均呈现深圳与香港>广州与深圳>韶关与广州的现象.在冷空气南下的典型天气过程中，4个城市ρ（PM2.5）小时均值存在显著相关，其中，韶关与广州的相关系数为0.84，广州与深圳的相关系数为0.80，深圳与香港的相关系数为0.92；4个城市间ρ（PM2.5）变化存在一定的滞后现象，其中，广州较韶关延迟4 h，深圳较广州延迟3 h，香港较深圳延迟1 h；而在西南暖湿气流控制的典型天气过程中，4个城市间ρ（PM2.5）变化的关联特征不明显.研究显示，冬季珠三角区域污染物在典型冷空气南下过程中存在较明显的空间传输延迟特征，并且各典型城市间浓度变化相关性较显著.

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2014年冬季珠三角区域典型城市PM 2.5 污染时空关联特征

In order to discuss the spatial transport delay of pollutants in the the Pearl River Delta (hereinafter referred to as the Pearl River Delta) in winter and its correlation with meteorology and geography, the weather map from December 1, 2014 to January 9, 2015, surface meteorological data of four typical cities in the Pearl River Delta - Shaoguan, Guangzhou, Shenzhen, Hong Kong and ρ (PM2.5), using methods such as time series and correlation analysis, analyzed the atmosphere of various cities in the winter of 2014 ρ The correlation characteristics of (PM2.5) changes and the influence of weather processes. The results show that during the study period, the typical weather processes controlled by 11 cold air southward and 3 southwest warm and humid air currents were observed in 4 typical cities ρ The time series trends of hourly mean and daily mean values (PM2.5) have consistency, and there is a significant difference between the four cities ρ The correlation (PM2.5) shows a phenomenon of Shenzhen and Hong Kong>Guangzhou and Shenzhen>Shaoguan and Guangzhou. In a typical weather process with cold air moving south, four cities ρ There is a significant correlation between the hourly mean (PM2.5), with a correlation coefficient of 0.84 between Shaoguan and Guangzhou, 0.80 between Guangzhou and Shenzhen, and 0.92 between Shenzhen and Hong Kong; Between 4 cities ρ There is a certain lag phenomenon in the change of (PM2.5), with Guangzhou delaying by 4 hours compared to Shaoguan, Shenzhen delaying by 3 hours compared to Guangzhou, and Hong Kong delaying by 1 hour compared to Shenzhen; In the typical weather process controlled by warm and humid airflow in the southwest, between the four cities ρ The correlation characteristics of (PM2.5) changes are not obvious. Studies have shown that pollutants in the Pearl River Delta region exhibit significant spatial transport delays during typical cold air southward movements in winter, and the correlation between concentration changes among typical cities is significant

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