基于后向轨迹的秋冬季漯河重污染输送及典型个例分析

doi:10.3969/j.issn.1673-503X.2022.03.008

Abstract

Abstract:

Based on conventional meteorological data, particulate matter observation data, global atmospheric assimilation system(GDAS) data, and reanalysis data from the National Center for Environment Prediction(NCEP) and ERA5, we analyzed the characteristics, pollutant transport, and potential source areas of heavy air pollution in Luohe during autumn and winter from 2015 to 2019, using methods of mathematical statistics, trajectory cluster analysis, and synoptic analysis.We also conducted an evaluation using a typical heavy pollution event.The results showed that heavy air pollution events have exhibited high occurrence frequency, long duration, and heavy pollution intensity in Luohe during autumn and winter in the past 5 years.The variation trends of air quality index(AQI) and PM_2.5 are not obvious, while the PM₁₀ concentration reduces significantly.Meanwhile, the ratio of PM_2.5/PM₁₀ increases year by year, and PM_2.5 is the primary air pollutant in Luohe.There are six air mass transport paths in Luohe during autumn and winter.The northeast path and the east path are major transport channels for heavy air pollution, characterized by short trajectory, slow movement, low height, and obvious transport in the near-surface layer.The northwest path with long-distance transport and deposition and the southwest path with short-distance transport contribute less to heavy air pollution in Luohe, with a low AQI and low probability for heavy pollution on average.The potential sources of air pollutants in Luohe are complex, with a wide range and strong intensity.They are mainly distributed in the middle and eastern regions of He'nan province, especially in the northeast region, corresponding to air mass trajectories such as the northeast path and the east path.Northerly winds prevail near the surface during heavy air pollution events, especially for the northerly and northeasterly flows with speeds between 2-4 m·s^-1.Two regional transport events indicate that the near-surface transport along the north or northeast paths is the main reason for the maintenance and development of AQI peaks.

Key words: HYSPLIT backward trajectory, Heavy air pollution, Cluster analysis, Regional transport, Potential source area

CLC Number:

Wei WU,Tie-liang SHAN. Transport and case study of heavy air pollution in Luohe during autumn and winter using backward trajectory analysis[J]. Journal of Meteorology and Environment, 2022, 38(3): 65-74.

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秋冬季	重污染过程/次数	累积持续时长/h	最大时长/h	AQI均值	PM_2.5均值/(μg·m^-3)	PM₁₀均值/(μg·m^-3)	PM_2.5/PM₁₀
2015年	12	647	206	271.8	227.6	300.8	0.75
2016年	14	716	166	266.2	215.6	306.6	0.70
2017年	14	601	140	263.3	208.8	296.2	0.71
2018年	15	770	193	265.3	208.0	269.9	0.77
2019年	11	387	104	243.9	193.8	218.4	0.88

编号	各轨迹条数	平均AQI	重污染轨迹数	重污染轨迹平均AQI	重污染轨迹概率/(%)
聚类1	739	127.45	121	257.91	16.3
聚类2	263	167.91	115	275.48	43.7
聚类3	380	139.69	70	244.81	18.4
聚类4	394	141.41	87	254.72	22.0
聚类5	259	148.27	64	288.67	24.7
聚类6	373	166.75	95	256.07	25.4

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Transport and case study of heavy air pollution in Luohe during autumn and winter using backward trajectory analysis

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