| 天空辐射计观测反演北京城区气溶胶光学特性 |
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| 引用本文： | 杨先逸,车慧正,陈权亮,梁苑新.天空辐射计观测反演北京城区气溶胶光学特性[J].应用气象学报,2020,31(3):373-384. |
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| 作者姓名： | 杨先逸 车慧正 陈权亮 梁苑新 |
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| 作者单位： | 1.成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225 |
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| 摘 要： | 利用2018年10月—2019年9月天空辐射计观测数据反演北京城区气溶胶光学特性参数，重点分析污染过程中气溶胶光学特性与气象条件的相关性。结果表明:500 nm气溶胶光学厚度在2—7月较大，最高值出现在6月，为0.71。单次散射反照率最高值出现在8月，为0.96；最低值出现在5月，为0.89。440~870 nm ?ngstr?m波长指数最高值出现在夏季，为1.11；最低值出现在春季，为0.89。统计发现污染日数仅占总日数的17%，其中62%为轻度污染；污染和清洁天气条件下PM2.5浓度分别为107.22 μg·m-3和47.16 μg·m-3，500 nm气溶胶光学厚度分别为0.85和0.49，单次散射反照率分别为0.96和0.92；冬季?ngstr?m波长指数在污染天气条件下（1.02）大于清洁天气（0.91），春季相反。结合天空辐射计、激光雷达和气象数据分析2019年1月一次污染事件，可知低风速与高湿度等不利气象条件、气溶胶粒子的吸湿增长和二次转化、污染物局地排放及区域输送共同导致污染事件发生。
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| 关 键 词： | 天空辐射计 气溶胶光学特性 污染天气 北京 |
| 收稿时间： | 2020-01-13 |
Retrieval of Aerosol Optical Properties by Skyradiometer over Urban Beijing |
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| Affiliation: | 1.School of Atmospheric Sciences, Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu University of Information Technology, Chengdu 6102252.State Key Laboratory of Severe Weather (LASW), CMA Key Laboratory for Atmospheric Chemistry, Chinese Academy of Meteorological Sciences, Beijing 100081 |
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| Abstract: | Aerosol particles can scatter and absorb solar radiation and affect microphysical processes of clouds to change the earth's radiation budget. It is reported that aerosol particles not only have an impact on climate change, but also cause polluted environment and affect human health. Ground-based measurement networks such as AERONET and SKYNET are very useful and accurate ways to monitor the spatio-temporal distribution of aerosols using the sun-sky radiometric technique. Aerosol optical properties retrieved by a PREDE skyradiometer are used to analyze the variation of aerosol in Beijing from October 2018 to September 2019. Results show that aerosol optical depth at 500 nm is high from February to July, the highest value is 0.71 in June, the highest single scattering albedo is 0.96 in August and the lowest value is 0.89 in May, ?ngstr?m exponent in summer (1.11) is higher than that in spring (0.89), and the volume size distribution pattern shows typical bimodal in every month. According to the Chinese National Secondary Standards for PM2.5, pollution days are picked. It is found that pollution days only account for 17%, of which 62% are light pollution days. The statistical result of air quality in Beijing is good from October 2018 to September 2019. Aerosol optical properties and PM2.5 under pollution and clean weather conditions in Beijing are discussed. The value of PM2.5 under pollution weather condition is 2.27 times larger than that under clean weather condition, values of aerosol optical depth at 500 nm are 0.85 and 0.49 under pollution and clean weather conditions, respectively. Values of single scattering albedo are 0.96 and 0.92 under pollution and clean weather conditions, respectively. The value of ?ngstr?m exponent under pollution weather condition (1.02) is larger than that under clean weather condition (0.91) in winter while the value of ?ngstr?m exponent under pollution weather condition (0.87) is smaller than that under clean weather condition (0.90) in spring. Skyradiometer retrieved data, combined with lidar measurement and meteorological data are used to analyze a serious pollution event in winter over Beijing. The result suggests that poor meteorological conditions (low wind speed and high relative humidity), the hygroscopic growth of aerosol, aerosol secondary transformation, local emissions and regional transportation lead to this serious pollution event. |
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