2000-2023年京津冀蓝天等级日数遥感研究  

Remote Sensing Study on Blue-sky Days in Beijing,Tianjin,and Hebei During the Period of 2000-2023

作　　者：延昊 刘桂青[2] 曹云 莫建飞 孙应龙 陈紫璇 程路 Yan Hao;Liu Guiqing;Cao Yun;Mo Jianfei;Sun Yinglong;Chen Zixuan;Cheng Lu(National Meteorological Center,Beijing 100081;CMA Earth System Modeling and Prediction Center,Beijing 100081;Guangxi Institute of Meteorological Sciences,Nanning 530022)

机构地区：[1]国家气象中心,北京100081 [2]中国气象局地球系统数值预报中心,北京100081 [3]广西壮族自治区气象科学研究所,南宁530022

出　　处：《应用气象学报》2024年第5期606-618,共13页Journal of Applied Meteorological Science

基　　金：广西重点研发计划(桂科AB23026052);国家自然科学基金项目(41571327)。

摘　　要：利用2000年12月—2023年12月卫星遥感反演的气溶胶光学厚度逐日资料,结合2023年每日中午地面观测蓝天资料,基于气溶胶光学厚度得到的蓝天等级监测指标,分析2000—2023年京津冀地区蓝天日数的时空变化特征及其变化趋势。结果表明:2001—2023年京津冀蓝天日数年平均值分别为144.2 d·a^(-1)、96.3 d·a^(-1)和119.6 d·a^(-1),北京蓝天日数最多,河北次之,天津最少。空间分布上,河北北部年平均蓝天日数最多,河北南部蓝天日数最少。京津冀蓝天日数具有明显季节变化,冬季和秋季蓝天日数最多,春季次之,夏季最少。2001—2023年京津冀蓝天日数年平均值均呈显著增加趋势,每10年分别增加18.1 d、22.3 d和16.3 d,其中2001—2013年无显著趋势变化,2013—2023年呈增加趋势,每10年分别增加26.9 d、46.5 d和36.4 d。Blue sky often represents better air quality and lower air pollution.Using satellite aerosol optical depth(AOD)data of Beijing,Tianjin and Hebei Province from 2000 to 2023,combined with the blue-sky data observed at noon time in 2023,a blue-sky grade index is established based on satellite AOD,in which the monitoring index of blue-sky grade is the AOD at 550 nm less than 0.36,and that of deep blue-sky grade is the AOD at 550 nm less than 0.2.Spatial and temporal characteristics of blue-sky grade days in Beijing-Tianjin-Hebei Region from 2000 to 2023 are investigated.Results show that the multi-year average blue-sky days in Beijing,Tianjin,and Hebei are 144.2 d·a^(-1),96.3 d·a^(-1),and 119.6 d·a^(-1),respectively,with the highest number of bluesky days for Beijing,followed by Hebei and the lowest number is recorded in Tianjin.In terms of spatial distribution,the northern part of Hebei has the highest annual average of blue-sky days,while the southern part of Hebei has the lowest number of blue-sky days.The number of blue-sky days in Beijing-Tianjin-Hebei exhibits noticeable seasonal changes,with the highest number of blue-sky days in winter and autumn,followed by spring,and the lowest in summer.From 2001 to 2023,the average annual number of clear-sky days in Beijing,Tianjin,and Hebei takes on an increasing trend,with an increase of 18.1 d,22.3 d and 16.3 d per decade,respectively.There is no significant trend change from 2001 to 2013.However,the annual average blue-sky days in Beijing-Tianjin-Hebei from 2013 to 2023 all show increasing trends,with increments of 26.9 d,46.5 d,and 36.4 d per decade,respectively.The annual average blue-sky days and deep blue-sky days in Beijing-Tianjin-Hebei from 2013 to 2023 are higher than those in 2001-2013,with the annual average blue-sky days in Beijing,Tianjin,and Hebei of 153.5 d,107.5 d,and 128.5 d,respectively,which are 17.5 d,21.8 d,and 16.9 d higher than those in 2001-2013.It may be largely due to the implementation of regional air pollution prevention and control measu

关 键 词：蓝天等级 气溶胶光学厚度 大气污染 季节变化 年际变化趋势 

分 类 号：P407[天文地球—大气科学及气象学]