汾渭平原典型污染城市PM<sub>2.5</sub>来源分布及传输分析

崔宏; 刘肖; 秦巧燕

doi:10.12153/j.issn.1674-991X.20210310

汾渭平原典型污染城市PM_2.5来源分布及传输分析

doi: 10.12153/j.issn.1674-991X.20210310

1.
山西师范大学地理科学学院
2.
山西师范大学分析测试中心

基金项目: 山西省高等学校科技创新项目（2019L0456）；山西省临汾市大气污染重点科技攻关项目（2019-KJHX036）

详细信息

作者简介:
崔宏（1988—），女，副教授，博士，主要研究方向为环境污染防治，cuihongd1988@163.com

中图分类号: X513
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出版历程
- 收稿日期: 2021-07-08

PM_2.5 source distribution and transmission analysis in typical polluted cities of Fenwei Plain

1.
School of Geographical Science, Shanxi Normal University
2.
Center of Analysis and Test, Shanxi Normal University

摘要

摘要:
基于后向轨迹模式（HYSPLIT）和美国国家环境预报中心的GDAS数据（2019年3月—2020年2月），模拟了临汾市冬季24 h的气团后向轨迹按季节的聚类，研究了不同来源区域对临汾市PM_2.5的主要污染来源和污染传输通道，阐明了PM_2.5不同轨迹传输的季节特征，结合潜在源贡献（PSCF）分析法和浓度权重轨迹（CWT）分析法，解析了不同污染源区对临汾市的污染贡献强度。结果表明：临汾市PM_2.5污染主要集中在冬季，春秋季次之，夏季最低；通过气团后向轨迹聚类分析发现，沿汾河流域西南与西北方向是大气污染主要传输通道；潜在源贡献和浓度权重轨迹分析发现，临汾市境内、洪洞县、尧都区、襄汾县污染贡献强度较大，周边城市榆林、运城、焦作对临汾市有所影响。
- PM_2.5 /
- 后向轨迹 /
- 潜在源贡献分析 /
- 浓度权重轨迹分析 /
- 汾渭平原
Abstract:
Based on HYSPLIT backward trajectory model and NCEP's GDAS data (from March 2019 to February 2020), the seasonal clustering of air mass backward trajectory in Linfen City for 24 hours in winter was simulated, the main pollution sources and pollution transmission channels of PM_2.5 from different source areas were studied, and the seasonal characteristics of different trajectory transmission of PM_2.5 were clarified. Combined with the potential source contribution factor (PSCF) analysis method and the concentration weighted trajectory (CWT) analysis method, the pollution contribution intensity of different pollution source areas to Linfen City was analyzed. The results showed that PM_2.5 pollution in Linfen City was mainly concentrated in winter, followed by spring and autumn, and the lowest in summer. Through the cluster analysis of the backward trajectory of the air mass, it was found that the southwest and northwest directions along Fenhe River Basin were the main pollution transmission channels of air pollution. Through the analysis of potential source contribution and concentration weight trajectory, it was found that the pollution contribution intensity in Hongtong County, Yaodu District, and Xiangfen County of Linfen City was relatively strong, and the surrounding cities of Yulin, Yuncheng, and Jiaozuo had a certain impact on Linfen City.
- PM_2.5 /
- backward trajectory /
- potential source contribution analysis /
- concentration weight trajectory analysis /
- Fenwei Plain

HTML全文

图 1 2019年3月—2020年2月临汾市AQI日均变化

Figure 1. Average daily change of AQI in Linfen City from March 2019 to February 2020

下载: 全尺寸图片幻灯片

图 2 2019年3月—2020年2月临汾市首要污染物占比

Figure 2. Proportion of primary pollutants in Linfen City from March 2019 to February 2020

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图 3 2019年3月—2020年2月临汾市I_sum月变化

Figure 3. Monthly variation of I_sum in Linfen City from March 2019 to February 2020

下载: 全尺寸图片幻灯片

图 4 2019年3月—2020年2月临汾市PM_2.5日均浓度变化

Figure 4. Changes of PM_2.5 daily average concentrations in Linfen City from March 2019 to February 2020

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图 5 2019年3月—2020年2月临汾市PM_2.5污染等级占比

Figure 5. Proportion of PM_2.5 pollution levels in Linfen City from March 2019 to February 2020

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图 6 临汾市PM_2.5的WPSCF季节分布

Figure 6. Seasonal distribution of WPSCF of PM_2.5 in Linfen City

下载: 全尺寸图片幻灯片

图 7 临汾市PM_2.5的WCWT季节分布

Figure 7. Seasonal distribution of WCWT of PM_2.5 in Linfen City

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表 1 PM_2.5污染等级划分

Table 1. Classification of PM_2.5 pollution level μg/m³　

0~35	35~75	75~115	115~150	150~250	>250
优	良	轻度污染	中度污染	重度污染	严重污染

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表 2 不同季节各气流轨迹聚类统计特征

Table 2. Statistical characteristics of airflow trajectories clustering in different seasons

季节	轨迹	方位	途经区域		占比/%	PM_2.5浓度均值/（μg/m³）
季节	轨迹	方位	地区	临汾市内	占比/%	PM_2.5浓度均值/（μg/m³）
春季	1	东北	河北（保定、石家庄），山西（晋中、长治、临汾）	安泽县、浮山县	11.46	41.01
	2	西北	内蒙古（鄂尔多斯），陕西（榆林），山西（吕梁、临汾）	隰县、蒲县、尧都区	20.34	41.31
	3	偏西	陕西（延安）、山西（临汾）	乡宁县、尧都区	33.88	50.88
	4	西北	蒙古国；我国内蒙古（阿拉善左盟、鄂尔多斯），陕西（榆林），山西（吕梁、临汾）	隰县、蒲县、尧都区	18.80	31.74
	5	东南	河南（郑州、焦作、济源），山西（晋城、临汾）	翼城县、襄汾县、尧都区	15.53	45.20
夏季	1	东南	河南（许昌、郑州、焦作、济源），山西（晋城、临汾）	翼城县、浮山县、尧都区	23.01	29.31
	2	西北	陕西（榆林、延安），山西（临汾）	隰县、蒲县、尧都区	8.56	31.97
	3	偏西	山西（运城、临汾）	曲沃县、襄汾县、尧都区	41.35	34.18
	4	偏北	内蒙古（包头、鄂尔多斯），山西（忻州、吕梁、临汾）	汾西县、洪洞县、尧都区	16.85	25.71
	5	偏东	河北（邯郸），河南（安阳），山西（晋城、临汾）	浮山县、尧都区	10.24	33.34
秋季	1	西北	山西（临汾）	隰县、蒲县、洪洞县、尧都区	27.24	56.89
	2	西北	内蒙古（阿拉善盟、鄂尔多斯），宁夏（石嘴山），陕西（榆林），山西（临汾）	永和县、隰县、蒲县、尧都区	19.73	50.57
	3	西北	新疆（哈密），甘肃（酒泉），宁夏（石嘴山），内蒙古（阿拉善盟、鄂尔多斯），陕西（榆林），山西（临汾）	永和县、隰县、蒲县、尧都区	4.95	35.04
	4	东南	河南（洛阳、济源），山西（运城、临汾）	翼城县、曲沃县、襄汾县、尧都区	20.42	42.91
	5	偏东	河北（邯郸），河南（安阳），山西（晋城、临汾）	浮山县、尧都区	27.66	40.62
冬季	1	偏南	山西（运城、临汾）	襄汾县、尧都区	41.99	113.19
	2	西北	内蒙古（鄂尔多斯），陕西（榆林），山西（吕梁、临汾）	隰县、蒲县、尧都区	17.99	84.79
	3	西北	宁夏（石嘴山），内蒙古（阿拉善盟、鄂尔多斯），陕西（榆林），山西（临汾）	永和县、隰县、蒲县、尧都区	12.57	86.18
	4	东南	河南（濮阳、新乡、焦作），山西（晋城、临汾）	汾西县、洪洞县	14.36	129.59
	5	西北	陕西（榆林），山西（吕梁、临汾）	翼城县、浮山县、尧都区	13.08	116.29

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