MERRA-2 inst3_3d_aer_Nv: 3d,3-Hourly,Instantaneous,Model-Level,Assimilation,Aerosol Mixing Ratio 0.625 x 0.5 degree

M2I3NVAER (or inst3_3d_aer_Nv) is an instantaneous 3-dimensional 3-hourly data collection in Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2). This collection consists of assimilations of aerosol mixing ratio parameters at 72 model layers, such as dust, sulphur dioxide, sea salt, black carbon, and organic carbon. The data field is available every three hour starting from 00:00 UTC, e.g.: 00:00, 03:00, … , 21:00 UTC. Section 4.2 of the MERRA-2 File Specification document provides pressure values nominal for a 1000 hPa surface pressure and refers to the top edge of the layer. The lev=1 is for the top layer, and lev=72 is for the bottom (or surface) model layer. MERRA-2 is the latest version of global atmospheric reanalysis for the satellite era produced by...M2I3NVAER（亦称inst3_3d_aer_Nv）是现代研究与应用再分析资料第二版（Modern-Era Retrospective analysis for Research and Applications version 2，MERRA-2）中的瞬时三维逐3小时数据集。该数据集包含72个模式层的气溶胶混合比参数同化数据，涵盖沙尘、二氧化硫、海盐、黑碳与有机碳等组分。数据场以协调世界时（UTC）00:00为起始时刻，每3小时更新一次，例如00:00、03:00……21:00 UTC。《MERRA-2文件规范》文档的4.2节给出了对应1000百帕地面气压的标称气压值，并以模式层的上边缘作为参考基准。其中lev=1对应顶层模式层，lev=72对应底层（或近地面）模式层。MERRA-2是由……生成的卫星时代全球大气再分析资料的最新版本。