摘要
氮氧化物(NOx)排放水平是衡量人为源大气污染物排放的关键指标。研究NOx排放的长期变化趋势并识别热点排放区域,对大气污染治理具有重要意义。本研究利用OMI和TROPOMI数据分析了川渝地区2010-2021年不同区域对流层NO2柱浓度长期变化趋势以及空间分布特征,并结合地面环境监测站NO2浓度数据和MEIC清单NOx排放量数据,评估了卫星观测的NOx排放的长期变化趋势。结果表明:(1)川渝地区NO2柱浓度的空间分布存在两个热点区域,分别为成都市和重庆市主城区。与OMI相比,TROPOMI因其高信噪比和高分辨率的特点,能够识别更精细的空间分布特征;(2)对流层NO_(2)柱浓度总体呈现下降趋势,在成都平原、重庆以及川渝地区的下降趋势分别为-0.115×10^(15)、-0.096×10^(15)和-0.053×10^(15)molec·(cm^(2)·a)^(-1);(3)2010-2012年随着工业源和交通源的NOx排放量增加,NO2柱浓度逐渐上升。2012-2015年NO2柱浓度大幅下降,川渝地区下降幅度为19.91%,主要归因于电力部门和工业部门的大幅减排。2015-2017年川渝地区NO2柱浓度上升10.76%,随后再次逐渐下降;(4)卫星观测的NO2柱浓度变化趋势能够较好地反映地面监测NO2浓度的变化趋势;(5)NO2柱浓度季节变化明显:四川盆地各地区冬季NO2柱浓度显著高于其他季节,春秋两季次之,夏季最低;而川西高原地区受自然源影响,夏季NO2柱浓度高于冬季。
The level of nitrogen oxides(NO_(x))emission is a key indicator for assessing anthropogenic atmospheric pollutant emissions.Understanding the long-term trends of NO_(x)emissions and identifying emission hotspots are of significant importance for air pollution control.This study utilized OMI and TROPOMI data to analyze the long-term trends and spatial distribution characteristics of tropospheric NO_(2)column density across various regions of Sichuan and Chongqing from 2010 to 2021.Additionally,ground-based NO_(2)concentration data from environmental monitoring stations and NOx emission data from the MEIC inventory were integrated to evaluate the long-term trends of NO_(x)emissions observed by satellite.Ground-based NO_(2)concentration measurements and MEIC NO_(x)emission inventory data are incorporated to assess the accuracy of satellite observations.The results show that:(1)The spatial distribution of NO_(2)column density in the Sichuan-Chongqing region reveals two hotspot areas,including Chengdu and the central urban area of Chongqing.Compared to OMI satellite,TROPOMI,with its higher signal-to-noise ratio and resolution,captures more detailed spatial distribution features;(2)tropospheric NO_(2)column density exhibits a declining trend,with rates of-0.115×10^(15),-0.096×10^(15)and-0.053×10^(15)molec·(cm^(2)·a)^(-)1 in the Chengdu Plain,Chongqing,and the Sichuan-Chongqing region,respectively;(3)NO_(2)column density increased with rising NOx emissions from industrial and transportation sources during 2010-2012.For the period of 2012-2015,NO_(2)column density decreased by 19.91%across the Sichuan-Chongqing region,which is mainly attributed to substantial emission reductions in power and industrial sectors.From 2015 to 2017,NO_(2)concentrations increased by 10.76%,followed by a gradual decline;(4)The trends in satellite-observed NO_(2)column density closely align with ground-level ambient NO_(2)measurements;(5)NO_(2)column density exhibits distinct seasonal variations:in the Sichuan Basin,winter NO_(2)concentrations are significantly higher than in other seasons,followed by spring and autumn,with summer concentrations being the lowest.In contrast,in the western Sichuan Plateau,NO_(2)concentrations are higher in summer than in winter due to natural sources.
作者
胡芩
杨显玉
王文雷
李豆旺
贲秉政
杨周
张小玲
HU Qin;YANG Xianyu;WANG Wenlei;LI Douwang;BEN Bingzheng;YANG Zhou;ZHANG Xiaoling(School of Atmospheric Sciences,Chengdu University of Information Technology,Sichuan Province Field Scientific Observation and Research Station for Urban Meteorology and Environment in Chengdu Plain,Chengdu 610225,Sichuan,China;Lanzhou University,Lanzhou 730000,Gansu,China;Chinese Academy of Meteorological Sciences,Institute of Atmospheric Composition and Environmental Meteorology,Beijing 100081,China)
出处
《高原气象》
北大核心
2025年第4期1083-1097,共15页
Plateau Meteorology
基金
国家自然科学基金项目(42175174)
国家重点研发计划课题(2023YFC3709301)
成都信息工程大学本科教学工程项目(JYJG2022006)。
关键词
氮氧化物
卫星遥感
排放清单
四川盆地
nitrogen oxides
satellite remote sensing
emission inventory
Sichuan Basin
