Global Annual PM2.5 Grids from MODIS, MISR and SeaWiFS Aerosol Optical Depth (AOD), 1998-2012

The Global Annual PM2.5 Grids from MODIS, MISR and SeaWiFS Aerosol Optical Depth (AOD) data sets represent a series of three-year running mean grids (1998-2012) of fine particulate matter (solid particles and liquid droplets) that were derived from a combination of MODIS (Moderate Resolution Imaging Spectroradiometer), MISR (Multi-angle Imaging SpectroRadiometer) and SeaWIFS (Sea-Viewing Wide Field-of-View Sensor) AOD satellite retrievals. Together the grids provide a continuous surface of concentrations in micrograms per cubic meter of particulate matter 2.5 micrometers or smaller (PM2.5) for health and environmental research. For each satellite-derived PM2.5 source, the total column retrievals of AOD were converted to near-ground PM2.5 levels using the GEOS-Chem chemical transport model to represent local relationships between AOD and PM2.5. A global decadal (2001-2010) mean PM2.5 concentration grid was also produced. The raster grids have a grid cell resolution of 6 arc-minutes (0.1 degree or approximately 10 sq. km at the equator) and cover the global land surface from 70 degrees north to 55 degrees south. Compared to SEDAC’s earlier data set, Global Annual Average PM2.5 Grids from MODIS and MISR Aerosol Optical Depth (AOD), v1 (2001–2010), this data set provides higher accuracy; longer temporal range; higher resolution (0.1 x 0.1 degrees); and time varying AOD to PM2.5 relationships, necessary for appropriate representation of trends.

本数据集系列由基于MODIS（Moderate Resolution Imaging Spectroradiometer，中分辨率成像光谱仪）、MISR（Multi-angle Imaging SpectroRadiometer，多角度成像光谱辐射计）与SeaWiFS（Sea-Viewing Wide Field-of-View Sensor，海洋宽视场传感器）的气溶胶光学厚度（Aerosol Optical Depth, AOD）卫星反演数据构建，包含1998-2012年的三年滑动平均细颗粒物网格数据。此处细颗粒物指直径2.5微米及以下的固体颗粒与液滴（PM2.5），该系列网格以微克每立方米为单位提供连续的地表浓度分布，可服务于健康与环境相关研究。针对每一类卫星反演得到的PM2.5数据源，研究人员借助GEOS-Chem化学传输模型，将气溶胶总柱反演得到的AOD转换为近地面PM2.5浓度，以此表征AOD与PM2.5之间的局地关联关系。研究团队同时还生成了一套2001-2010年的全球年代际平均PM2.5浓度网格数据。该栅格网格的单元分辨率为6角分（0.1度，赤道处约合10平方千米），覆盖北纬70度至南纬55度的全球陆地区域。相较于SEDAC（Socioeconomic Data and Applications Center，社会经济数据与应用中心）早期发布的《基于MODIS与MISR气溶胶光学厚度反演的全球年度平均PM2.5网格数据集v1（2001-2010）》，本数据集具备更高的精度、更长的时间跨度、更高的分辨率（0.1×0.1度），以及可反映时间变化的AOD与PM2.5关联关系，这对准确还原浓度变化趋势而言必不可少。

搜集汇总

背景与挑战

背景概述

该数据集为1998-2012年全球PM2.5浓度的高分辨率网格数据，结合多源卫星AOD反演和化学传输模型，提供连续的地面PM2.5浓度分布，适用于健康和环境研究。