GEM-MACH ensemble files for EnsAI validation set (2014-07)

This data repository contains the files used for validation the EnsAI chemical ensemble generation system(Sitwell [2025]) for 2014-07. Files for each fields are saved in compressed in .tar.gz files, each of which contains the files of thatfield type for a particular year and month. Each field for a particular date and time are save as abinary numpy file (.npy). The description of each field and its units are as follows: ENH3: NH3 emissions perturbation (g/s) TT: surface temperature (C) UU: zonal wind (kts) VV: meridional wind (kts) TNH3: NH3 surface concentration perturbation (ppbm) The grid that each field is defined on has coordinates that are given in the file coords.npz. Files can beread with NumPy's 'load' function. Ensembles were generated as documented in Sitwell et al. [2022] using version 3.1.0 GEM-MACH air qualitymodel (Moran 2010). References: Sitwell, M., Shephard, M. W., Rochon, Y., Cady-Pereira, K., and Dammers, E.: An ensemble-variationalinversion system for the estimation of ammonia emissions using CrIS satellite ammonia retrievals,Atmospheric Chemistry and Physics, 22, 6595–6624, 2022. Sitwell, M.: EnsAI: An Emulator for Atmospheric Chemical Ensembles, doi:https://doi.org/10.5281/zenodo.15342768, 2025. Moran, M., Ménard, S., Talbot, D., Huang, P., Makar, P., Gong, W., Landry, H., Gravel, S., Gong, S., Crevier,L.-P., Kallaur, A., and Sassi, M.: Particulate-matter forecasting with GEM-MACH15, a new Canadian air-qualityforecast model, Air Pollution Modelling and Its Application XX, pp. 289–292, 2010.本数据集仓库包含用于验证2014年7月版EnsAI化学集合生成系统（EnsAI chemical ensemble generation system，Sitwell [2025]）的相关文件。 各字段文件以.tar.gz压缩格式存储，每个压缩包包含对应特定年月的该类字段文件。特定日期与时刻的各字段文件均保存为二进制NumPy文件（.npy）。 各字段及其单位说明如下： ENH3：氨气（NH3）排放扰动值（单位：克/秒，g/s） TT：地表温度（单位：摄氏度，C） UU：纬向风（单位：节，kts） VV：经向风（单位：节，kts） TNH3：氨气（NH3）地表浓度扰动值（单位：ppbm） 各字段所在的网格坐标信息存储于coords.npz文件中。可通过NumPy库的`load`函数读取上述文件。 集合的生成方法详见Sitwell等人[2022]的研究，采用GEM-MACH空气质量模型3.1.0版本（Moran 2010）。 参考文献： Sitwell, M., Shephard, M. W., Rochon, Y., Cady-Pereira, K., and Dammers, E.：基于CrIS卫星氨气反演数据估算氨气排放的集合变分反演系统，《大气化学与物理》，22卷，6595–6624页，2022年。 Sitwell, M.：EnsAI：大气化学集合模拟器，doi:https://doi.org/10.5281/zenodo.15342768, 2025年。 Moran, M., Ménard, S., Talbot, D., Huang, P., Makar, P., Gong, W., Landry, H., Gravel, S., Gong, S., Crevier, L.-P., Kallaur, A., and Sassi, M.：使用加拿大新一代空气质量预报模型GEM-MACH15开展颗粒物预报，《空气污染模拟及其应用XX》，第289–292页，2010年。