Temporal Variability of Tropospheric NO_(2) over Cities in the United States,Western Europe and China from 2005 to 2022  

作　　者：ZHANG Qianqian 

机构地区：[1]National Satellite Meteorological Center,National Centre for Space Weather,Beijing 100081,China [2]Innovation Center for Fengyun Meteorological Satellite(FYSIC),Beijing 100081,China [3]Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites,Key Laboratory of Space Weather,Chna Meteorological Administration,Beijing 100081,China

出　　处：《Chinese Geographical Science》2024年第6期983-992,共10页中国地理科学（英文版）

基　　金：Under the auspices of the National Natural Science Foundation of China(No.42375106,41805098);the National Key R&D Program of China(No.2023YFB3907500)。

摘　　要：Anthropogenic Nitrogen oxides(NO_(x)=NO_(2)+NO)emissions are highly concentrated in urban area,and the weekly cycles,seasonal patterns and long-term trends of tropospheric NO_(2) columns over cities differ from region to region due to different emission sectoral compositions and human activities.In this study,we used satellite observed tropospheric NO_(2) column data to compare the longand short-term NO_(2) column density time series over cities in the United Sates(the U.S.),western Europe and China.The results showed that in all the targeted cities,the outbreak of the Corona Virus Disease in 2019(COVID-19)moved the December peak of the city-level NO_(2)columns forward to November and October or even earlier in 2020 and 2021.On weekly level,cities in the U.S.show the lowest NO_(2) columns ratio on weekend/work day,then come the western European cities,and a weak weekly pattern is seen in Chinese cities.For all the cites,we find a higher weekend/work day NO_(2) ratio in cold seasons than in warm seasons,indicating a higher contribution from NOx emission sectors of residential,industry and power plants in the warm seasons.In the long-term,NO_(2) columns over the U.S.and western European cities declined by a fraction twice that of the regional mean level from 2004 to 2021.In China,NO_(2) columns started to decrease since 2012,at a similar rate between the city and regional level.This work confirms the importance to quantify and control NOx emissions from cities.

关 键 词：NO_(2) columns urban region weekly cycle seasonal pattern long-term trend United States western Europe China 

分 类 号：X511[环境科学与工程—环境工程] P421.31[天文地球—大气科学及气象学]