基于轨迹聚类河南地区大气污染过程空气输送通道研究

doi:10.3969/j.issn.1673-503X.2017.04.004

Abstract

Abstract: Besides local sources of pollution,the outside pollutants transport is one of the most important factors significantly affecting air pollution.Lagrangian mixed with single particle trajectory model (HYSPLIT) was used to investigate the characteristics of air transport channels during severe pollution events in He'nan province.Meteorological background fields were also analyzed using the surface wind field and NCEP reanalysis data.The results indicate that the northwest airflow is prevalent in winter over He'nan province during 1986 and 2015.The air masses mainly come from Eurasia,passing Hebei,Shaanxi and Shanxi provinces,finally reaching He'nan province.Statistics of the 17 severe pollution events in 2015 shows that the air transport channels are mainly from the south (32%),the north (24%) and the east (27%) direction,respectively,which are generally below 900 hPa.After severe pollution event,the northwest wind becomes stronger whereas the south wind disappears,then the pollutants spread promptly.The simulation on severe pollution events occurring during December 5-13,2015 suggests although it doesn't account for the highest proportion,the northern channel brings most pollutants while passing the higher-pollutant areas.The weaker wind against diffusion in this channel contributes to pollution as well.Meteorological observations further confirm that static stability situations control He'nan province while severe pollution occurs.Much vapor is brought by the southeast wind,and high relative humidity doesn't favor diffusion.

Key words: Trajectory clustering, Air pollution, Air transport channel, Back trajectory

CLC Number:

YANG Hao, BAI Yong-qing, LIU Lin, XU Guan-yu, WANG Ling-ling, KONG Hai-jiang. Analysis of air transport channels during pollution process in He'nan province based on trajectory clustering[J]. Journal of Meteorology and Environment, 2017, 33(4): 29-39.

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Analysis of air transport channels during pollution process in He'nan province based on trajectory clustering

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