基于Sentinel⁃5P/TROPOMI数据的山西省对流层NO2柱浓度时空特征
张茜茹 , 张萱 , 米晓楠 , 周涛 , 魏海茹
内蒙古师范大学学报(自然科学版) ›› 2026, Vol. 55 ›› Issue (04) : 386 -394.
基于Sentinel⁃5P/TROPOMI数据的山西省对流层NO2柱浓度时空特征
Spatiotemporal Characteristics of Tropospheric NO2 Column Concentrations in Shanxi Province Based on Sentinel-5P/TROPOMI Data
利用2019—2023年Sentinel⁃5P/TROPOMI的L2级产品NO2柱浓度日数据,系统分析山西省NO2的时空变化特征、季节变化规律及各市逐月均值变化趋势,并对比2019年与2020年1月至3月期间 各市逐旬NO2柱浓度变化,以评估2020年新冠疫情对NO2浓度的影响。结果表明:(1)Sentinel⁃5P/TROPOMI反演的对流层NO2柱浓度与地面监测NO2浓度呈较好的正相关性,其中晋中市的线性拟合R²超过0.8,反演产品能够较为真实地反映近地面NO2污染状况;(2)2019—2023年山西省对流层NO2柱浓度呈先下降后上升的趋势;(3)山西省NO2柱浓度存在明显的季节特征,冬季最高,夏季最低;(4)2019—2023年山西省对流层NO2柱浓度年均值空间分布与季节均值空间分布具有较高的一致性,中南部均高于北部,且大值区主要集中在山西中部及东南部;(5)受新冠疫情影响,自2020年2月上旬起,山西省各地市NO2柱浓度较2019年同期显著下降,3月上旬起,工厂、企业逐步复工复产,至3月下旬复工复产已达较高水平,接近2019年同期。研究结果揭示了山西省NO2污染的时空分布规律及其对突发事件的响应特征,可为区域大气污染防治政策的制定提供科学依据。
Daily L2 product data of NO2 column concentrations retrieved by Sentinel-5P/TROPOMI from 2019 to 2023 were adopted to systematically analyze the spatiotemporal variation characteristics, seasonal variation patterns, and monthly average trends of NO2 in each city of Shanxi Province. The ten-day NO2 column concentrations of all cities from January to March in 2019 and 2020 were compared to evaluate the influence of COVID-19 on NO2 concentrations. The results showed that a favorable positive correlation was identified between tropospheric NO2 column concentrations retrieved by Sentinel-5P/TROPOMI and ground-monitored NO2 concentrations. The linear fitting R² value of Jinzhong exceeded 0.8, which indicated that the retrieved products could truly reflect the near-surface NO2 pollution status. Additionally, the tropospheric NO2 column concentrations in Shanxi Province from 2019 to 2023 presented a trend of first decreasing and then increasing. Obvious seasonal variations were observed for NO2 column concentrations across Shanxi, with the maximum value in winter and the minimum in summer. High consistency was found between the spatial distribution of annual average and seasonal average tropospheric NO2 column concentrations in Shanxi Province from 2019 to 2023. Higher values were detected in central and southern regions than in northern areas, and high-value zones were mainly concentrated in central and southeastern Shanxi. Affected by COVID-19, the NO2 column concentrations of all cities in Shanxi were significantly reduced in early February 2020 compared with the same period in 2019. Factories and enterprises gradually resumed production from early March, and the resumption level reached a high level in late March, which was close to the value of the same period in 2019. The research findings revealed the spatiotemporal distribution patterns of NO2 pollution in Shanxi and its response characteristics to emergent events, and could provide a scientific basis for the formulation of regional air pollution prevention and control policies.
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山西省青年基金资助项目“基于Sentinel⁃5P/TROPOMI数据的山西省对流层NO2柱浓度时空特征研究”(SXKQNQH20226342)
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