| 苏静,孙娴,胡琳,林杨.陕西省环境气象评估指数EMI时空变化特征研究[J].沙漠与绿洲气象,2024,18(2):146~154 |
| 陕西省环境气象评估指数EMI时空变化特征研究 |
| Study on Spatiotemporal Variation Characteristics of Meteorological Condition Assessment Index (EMI) in Shaanxi |
| 投稿时间：2023-04-07 修订日期：2023-06-14 |
| DOI： |
| 中文关键词: 陕西省 细颗粒物PM2.5 环境空气质量评价 PM2.5气象条件评估指数（EMI） 贡献率 |
| 英文关键词:Shaanxi province fine particle PM2.5 ambient air quality assessment evaluation on meteorological condition index of PM2.5 pollution contribution rate. |
| 基金项目:中国气象局气候变化专项（CCSF201938），陕西省重点研发计划（2021SF-476） |
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| 中文摘要: |
| 基于陕西省10地市2015—2020年PM2.5浓度实况监测数据和同期EMI指数，统计分析EMI和PM2.5相关性及近年EMI的时空分布特征，定量评估气象条件变化及综合治理措施对陕西环境空气质量的影响。结果表明：陕西省2015—2020年EMI指数可以较好的表征和评估气象条件变化导致PM2.5浓度的变化。2015—2020年EMI指数呈线性降低趋势，气象条件持续向好。月EMI指数均呈明显的单谷分布特征，EMI指数冬半年大，夏半年小。各区域EMI指数总体上呈关中高、陕南次之，陕北最低的分布特点，关中中、东部EMI指数最大。EMI正距平百分比高值区主要出现在关中地区，各年关中均有60%以上面积正距平，其中2016年冬季关中83.0%面积正距平，37.5%面积正距平超过100%。2020年陕西省各区域环境空气质量较2015—2019年均有明显改善，全省PM2.5浓度较前5 a平均降低24.8%，全省气象条件改善使PM2.5浓度较近5 a降低16.4%，排放变化使得PM2.5浓度较前5 a平均下降9.4%，可见近年陕西省大气污染综合治理措施成果显著，环境质量明显改善。 |
| 英文摘要: |
| This paper used the actual monitoring data of PM2.5 concentration and EMI index in Shaanxi Province from 2015 to 2020, analyzed the temporal and spatial distribution characteristics of EMI in recent years, evaluated the impact of meteorological conditions change and control measures on Shaanxi ambient air quality. The results show that: From 2015 to 2020, EMI index can characterize and evaluate the changes quite good in PM2.5 concentration caused by meteorological conditions. Since 2015, EMI index showed a linear decreasing trend with the pickup of meteorological conditions. EMI index was higher in winter than that in summer and it is high in Guanzhong region, followed by southern Shaanxi and northern Shaanxi, with the highest occurring in the central and western regions of Guanzhong region. According to the spatial distribution of meteorological conditions in winter, it was found that the regions with high positive EMI anomaly percentage concentration were in Guanzhong region. In the winter of 2016,the area of positively off level were 83.0% and positively offset by more than 100% were 37.5% in Guanzhong. Compared to the past five years, the PM2.5 concentration decreased by 24.8 %, among them, the contribution rates of emission reduction and meteorological conditions respectively are 16.4% and 9.4%. It can be seen that the comprehensive control measures of air pollution in the province have achieved remarkable results in recent years, and the environmental quality has improved significantly. |
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