Implementation of an Ensemble Kalman Filter in the Community Multiscale Air Quality Model (CMAQ Model v5.1) for Data Assimilation of Ground-level PM2.5: Model Simulation Outputs

This data sets are model outputs from CMAQ simulations. The output contains only PM2.5 variable after combining related aerosol species. File format is netCDF binary. File naming convention for Domain 1 (D1) is D1_EXP_DATE_TIME_e000.nc where EXP is the control experiment (CTR) or the assimilation experiments (DA_icbc), DATE means YYYYMMDD format date, TIME indicates 2 digits UTC time, and e000 represents ensemble mean result. Also, file naming convention for Domain 2 (D2) is D2_EXP_CASE_DATE_TIME_e000 where EXP is the control experiment (CTR) or the assimilation experiments (DA_ic and DA_icbc), CASE is the simulation cases for ANL or PRD, DATE means YYYYMMDD format date, TIME indicates 2 digits UTC time, and e000 represents ensemble mean result. For the processed and assimilated observation data in this study for D1 and D2, the file names are D1_OBS_DATA_YYYYMMDDhh.txt and D2_OBS_DATA_YYYYMMDDhh.txt, respectively, where YYYYMMDD is date format and hh is UTC.

本数据集源自CMAQ模式的模拟输出结果。该输出仅包含经相关气溶胶物种合并处理后的PM2.5（细颗粒物）变量，文件格式为netCDF二进制格式。
域1（Domain 1，简称D1）的文件命名规则为：D1_EXP_DATE_TIME_e000.nc，其中EXP为控制试验（CTR）或同化试验（DA_icbc）；DATE为YYYYMMDD格式的日期；TIME为两位协调世界时（UTC）时刻；e000代表集合平均结果。
域2（Domain 2，简称D2）的文件命名规则为：D2_EXP_CASE_DATE_TIME_e000，其中EXP为控制试验（CTR）或同化试验（DA_ic、DA_icbc）；CASE为ANL或PRD对应的模拟工况；DATE为YYYYMMDD格式的日期；TIME为两位协调世界时（UTC）时刻；e000代表集合平均结果。
针对本研究中D1与D2域的经处理及同化后的观测数据，其文件名分别为D1_OBS_DATA_YYYYMMDDhh.txt与D2_OBS_DATA_YYYYMMDDhh.txt，其中YYYYMMDD为日期格式，hh为协调世界时（UTC）时刻。