@article{TIAN2026, 
author = {Weihong TIAN and Zhaorong ZHUANG and Wei HAN and Xueshun SHEN and Hong WANG and Liping HUANG},
title = {Impacts of aerosol data assimilation on the performance of the CMA-CW v1.0 rapid update cycle system},
year = {2026},
journal = {Acta Meteorologica Sinica},
volume = {84},
number = {5},
pages = {951-963},
keywords = {CMA-CW v1.0 rapid update cycle system, Surface aerosol assimilation, 3D-Var, Impact assessment evaluation},
url = {https://www.sciopen.com/article/10.11676/qxxb2026.20250096},
doi = {10.11676/qxxb2026.20250096},
abstract = {To fully understand the impact of assimilating ground-based aerosol observations on the forecast performance of the CMA Regional Chemical Weather Numerical Prediction System version1.0 (CMA-CW v1.0), continuous cycle tests were conducted over a one-month period in both winter and summer at 6 h intervals. Results of 72 h forecasts at 00:  00 UTC were examined and evaluated, and the conclusions are as follows. (1) The CMA-CW v1.0 rapid update cycle system is capable of efficiently assimilating ground-based aerosol observation data. The December 2023 experiment significantly improved the accuracy of PM2.5 mass concentration analysis, reducing the monthly mean root-mean-square error by approximately 25 μg/m3, representing a relative reduction of about 47%; it also significantly improved the accuracy of 24 h forecasts for PM2.5 mass concentration and visibility, with a marked reduction in instances of missing aerosol pollutant concentration forecasts. (2) The assimilation of ground-based aerosol observation data not only improved the forecasting capability for pollutant concentrations but also made a significant positive contribution to the forecasting of weather elements; the winter experiment (December 2023) indicated that aerosol data assimilation made a positive contribution to light rain forecasts, while the summer precipitation experiment (July 2025) showed that aerosol assimilation made a positive contribution to 24 h precipitation forecasts across all intensity levels; however, aerosol observation assimilation caused a slight increase in the 2 m air temperature forecast but had no impact on the 10 m wind forecast. The CMA-CW v1.0 rapid cycle system has been put into operational use and can provide reliable technical support for air quality forecasting and early warning.}
}