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气象:2020,46(10):1297-1309
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基于FY-4A卫星资料的中国区域网格化地表大气颗粒物浓度估算
江琪,桂海林,张天航,王飞,张碧辉,迟茜元,徐冉
(国家气象中心,北京 100081;上甸子国家大气本底站,北京 101507;中国气象科学研究院,北京 100081)
Estimation of Gridding Surface Atmospheric Particle Matter Concentration in China Based on FY-4A Satellite Observation
JIANG Qi,GUI Hailin,ZHANG Tianhang,WANG Fei,ZHANG Bihui,CHI Xiyuan,XU Ran
(National Meteorological Centre, Beijing 100081;Shangdianzi National Atmosphere Background Station, Beijing 101507;Chinese Academy of Meteorological Sciences, Beijing 100081)
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投稿时间:2019-09-25    修订日期:2020-07-20
中文摘要: 利用PMRS(physical PM2.5 remote sensing)方法,对FY-4A卫星资料进行反演,并通过与地面站点资料融合,得到我国近地面PM2.5网格化实况。建立清洁、霾、沙尘背景条件下PM2.5与PM10转化关系的格点地图,进一步估算我国地表PM10浓度。结果表明,不同区域间细粒子柱状体积消光比(VEf)与大气细粒子比(FMF)均存在相似的相关关系,以FMF=0.4 为界,分别建立了两个VEf拟合方程,估算得到的VEf与AERONET观测的VEf相关性(r2)高于0.85。霾过程中,通过PMRS方法反演得到的近地面PM2.5质量浓度与实况站点分布有较好的匹配,基本可以反映出污染的高浓度区域,单点检验中,反演结果与实况数据存在一定的相关性,其中京津冀的r2可达0.39,但数值上仍存在高估或低估。为了解决这一问题,本研究将卫星反演格点结果与地面观测站点进行融合,最终得到与实况吻合较好的0.25°×0.25°全国PM2.5网格化实况。不同天气背景条件下各站点PM10和PM2.5相关性均高于0.7。其中,沙尘时段PM10/PM2.5>3高值区与我国沙源地和沙尘高发区有较好的对应关系。霾时段PM10/PM2.5接近于1,清洁时段,全国大部PM10/PM2.5介于1~2。通过PM2.5与PM10转化关系的格点地图,根据不同天气背景,反演得到我国网格化地表PM10实况,其结果可以较好地反映我国西北地区的沙尘天气过程。
Abstract:In this study, the physical PM2.5 remote sensing (PMRS) method was used to invert the FY-4A observation data, and through the fusion with the surface station data, the near-surface PM2.5 gridding observation data in China were obtained. A grid map of the relationship between PM2.5 and PM10 was established under different conditions of clean, haze and dust background, and PM10 concentration in China was further estimated. The results showed that there is a similar correlation between columnar volume-to-extinction ratio of fine particulates (VEf) and fine mode fraction (FMF) in different regions. With FMF=0.4 as the boundary, two fitting equations of VEf are established respectively. The estimated correlation (r2) between VEf and AERONET observation is higher than 0.85. During the haze period, the PM2.5 mass concentration obtained by PMRS has a good match with the observation site distribution, which can basically reflect the high concentration area of pollution. In single point test, the remote sensing result has a certain correlation with the surface observation, with r2 reaching 0.39 in the region of Beijing-Tianjin-Hebei. However, to some extent there is still overestimation or underestimation in the value of inversion compared to surface observation data. In order to solve this problem, the study combines the satellite inversion grid results with the surface observation site, and finally obtains a 0.25°×0.25° national PM2.5 gridding observation data that are in good agreement with the surface observation data. The r2 between PM10 and PM2.5 is higher than 0.7 under different weather conditions. Among them, the value PM10/PM2.5>3 matches with the sand source area and the high dust area in China during the dust period. During the haze period, PM10/PM2.5 is close to 1, and the value is between 1 and 2 during cleaning period for most stations. Through the grid map of the relationship between PM2.5 and PM10, according to different weather backgrounds, the gridded surface PM10 in China is obtained, and the results can better reflect the dust process in Northwest China.
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基金项目:国家重点研发计划(2019YFC0214602)、国家自然科学基金项目(41875181)、中国气象局气象预报业务关键技术发展专项[YBGJXM(2019)02-02]、国家气象中心预报员专项(Y201919和Y201917)和上甸子国家大气本底站开放研究课题(SDZ2020613)共同资助
引用文本:
江琪,桂海林,张天航,王飞,张碧辉,迟茜元,徐冉,2020.基于FY-4A卫星资料的中国区域网格化地表大气颗粒物浓度估算[J].气象,46(10):1297-1309.
JIANG Qi,GUI Hailin,ZHANG Tianhang,WANG Fei,ZHANG Bihui,CHI Xiyuan,XU Ran,2020.Estimation of Gridding Surface Atmospheric Particle Matter Concentration in China Based on FY-4A Satellite Observation[J].Meteor Mon,46(10):1297-1309.