Global Annual PM2.5 Grids from MODIS, MISR and SeaWiFS Aerosol Optical Depth (AOD), 1998-2019, V4.GL.03

The Global Annual PM2.5 Grids from MODIS, MISR and SeaWiFS Aerosol Optical Depth (AOD), 1998-2019, V4.GL.03 consists of annual concentrations (micrograms per cubic meter) of all composition ground-level fine particulate matter (PM2.5). This data set combines AOD retrievals from multiple satellite algorithms

including the NASA MODerate resolution Imaging Spectroradiometer Collection 6.1 (MODIS C6.1), Multi-angle Imaging SpectroRadiometer Version 23 (MISRv23), MODIS Multi-Angle Implementation of Atmospheric Correction Collection 6 (MAIAC C6), and the Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) Deep Blue Version 4. The GEOS-Chem chemical transport model is used to relate this total column measure of aerosol to near-surface PM2.5 concentration. Geographically Weighted Regression (GWR) is used with global ground-based measurements from the World Health Organization (WHO) database to predict and adjust for the residual PM2.5 bias per grid cell in the initial satellite-derived values. These estimates are primarily intended to aid in large-scale studies. Gridded data sets are provided at a resolution of 0.01 degrees to allow users to agglomerate data as best meets their particular needs. Data sets are gridded at the finest resolution of the information sources that were incorporated, but do not fully resolve PM2.5 gradients at the gridded resolution due to influence by information sources at coarser resolution. The data are distributed as GeoTIFF files and are in WGS84 projection.

该全球年度PM2.5网格数据集（MODIS、MISR和SeaWiFS气溶胶光学厚度，1998-2019，版本V4.GL.03）包含所有成分的地表细颗粒物（PM2.5）年浓度（每立方米微克）。本数据集综合了来自多个卫星算法的气溶胶光学厚度（AOD）反演结果，包括美国宇航局（NASA）中等分辨率成像光谱辐射计系列6.1（MODIS C6.1）、多角度成像光谱辐射计版本23（MISRv23）、MODIS多角度大气校正实现系列6（MAIAC C6）和海洋观测宽视场传感器（SeaWiFS）深海蓝版本4。GEOS-Chem化学传输模型被用于将此气溶胶总柱量与近地表PM2.5浓度相关联。地理加权回归（GWR）方法结合世界卫生组织（WHO）数据库的全球地面测量数据，用于预测和调整初始卫星反演值中每个网格单元的PM2.5残余偏差。这些估算主要用于辅助大规模研究。提供以0.01度分辨率的栅格数据集，以便用户根据其特定需求聚合数据。数据集以纳入的信息源的最细分辨率进行栅格化，但由于较粗分辨率信息源的影响，无法在栅格分辨率上完全解析PM2.5梯度。数据以GeoTIFF文件形式分发，并采用WGS84投影。