Retrieval of Boundary Layer Height and Its Influence on PM 2.5 Concentration Based on Lidar Observation over Guangzhou

IF 1.5 4区 地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES 热带气象学报 Pub Date : 2021-09-01 DOI:10.46267/J.1006-8775.2021.027
Song Lang, Deng Tao, Liang Zhen-ning, Wu Sheng, He Guo-wen, Li Fei, Wu Meng, Wu Dui
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引用次数: 7

Abstract

Wavelet analysis was applied to lidar observations to retrieve the planetary boundary layer height (PBLH) over Guangzhou from September 2013 to November 2014 over Guangzhou. Impact of the boundary effect and the wavelet scale factor on the accuracy of the retrieved PBLH has been explored thoroughly. In addition, the PBLH diurnal variations and the relationship between PM2.5 concentration and PBLH during polluted and clean episodes were studied. Results indicate that the most steady retrieved PBLH can be obtained when scale factor is chosen between 300-390 m. The retrieved maximum and minimum PBLH in the annual mean diurnal cycle were ~1100 m and ~650 m, respectively. The PBLH was significantly lower in the dry season than in the wet season, with the average highest PBLH in the dry season and the wet season being ~1050 m and ~1200 m respectively. Compared to the wet season, the development of PBLH in the dry season was delayed by at least one hour due to the seasonal cycle of solar radiation. Episode analysis indicated that the PBLH was ~50% higher during clean episodes than during haze episodes. The average highest PBLH in the haze episodes and clean episodes were ~800 m and ~1300 m, respectively. A significant negative correlation between PBLH and PM2.5 concentration(r=-0.55**) is discovered.According to China "Ambient Air Quality Standard", the PBLH values in good and slightly polluted conditions were 1/6-1/3 lower than that in excellent conditions, while the corresponding PM2.5 concentration were ~2-2.5 times higher.
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基于激光雷达观测的边界层高度反演及其对PM2.5浓度的影响
将小波分析应用于激光雷达观测,反演了2013年9月至2014年11月广州上空行星边界层高度。深入探讨了边界效应和小波尺度因子对PBLH反演精度的影响。此外,还研究了污染和清洁期间PBLH的日变化以及PM2.5浓度与PBLH的关系。结果表明,当比例因子选择在300-390m之间时,可以获得最稳定的回收PBLH。在年平均日周期中,回收的最大和最小PBLH分别为~1100m和~650m。旱季的PBLH显著低于雨季,旱季和雨季的平均最高PBLH分别为~1050m和~1200m。与雨季相比,由于太阳辐射的季节性循环,旱季PBLH的发育至少推迟了一个小时。发作分析表明,在清洁发作期间,PBLH比在雾霾发作期间高约50%。雾霾期和清洁期的平均最高PBLH分别为~800m和~1300m。PBLH与PM2.5浓度呈显著负相关(r=-0.55**)。根据中国《环境空气质量标准》,良好和轻度污染条件下的PBLH值比优良条件下低1/6-1/3,而相应的PM2.5浓度高出约2-2.5倍。
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来源期刊
热带气象学报
热带气象学报 METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
1.80
自引率
8.30%
发文量
2793
审稿时长
6-12 weeks
期刊介绍: Information not localized
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