Abstract
Radar data, which have incomparably high temporal and spatial resolution, and lightning data, which are great indicators of severe convection, have been used to improve the initial field and increase the accuracies of nowcasting and short-term forecasting. Physical initialization combined with the three-dimensional variational data assimilation method (PI3DVar_rh) is used in this study to assimilate two kinds of observation data simultaneously, in which radar data are dominant and lightning data are introduced as constraint conditions. In this way, the advantages of dual observations are adopted. To verify the effect of assimilating radar and lightning data using the PI3DVar_rh method, a severe convective activity that occurred on 5 June 2009 is utilized, and five assimilation experiments are designed based on the Weather Research and Forecasting (WRF) model. The assimilation of radar and lightning data results in moister conditions below cloud top, where severe convection occurs; thus, wet forecasts are generated in this study. The results show that the control experiment has poor prediction accuracy. Radar data assimilation using the PI3DVar_rh method improves the location prediction of reflectivity and precipitation, especially in the last 3-h prediction, although the reflectivity and precipitation are notably overestimated. The introduction of lightning data effectively thins the radar data, reduces the overestimates in radar data assimilation, and results in better spatial pattern and intensity predictions. The predicted graupel mixing ratio is closer to the distribution of the observed lightning, which can provide more accurate lightning warning information.
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Acknowledgments
We thank ECMWF for providing the 0.703125° ERA-Interim dataset (https://rda.ucar.edu/datasets/ds627.0/). We thank the China Meteorological Data Service Center website for providing 0.1° × 0.1° merged precipitation data from automatic weather stations in China and CMORPH satellite data (http://data.cma.cn/data/cdcdetail/dataCode/SEVP_CLI_CHN_MERGE_CMP_PRE_HOUR_GRID_0.10.html). We also thank the Weather Service Forecast Office of China for providing the radar and lightning data.
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Supported by the National Key Research and Development Program of China (2017YFC1502102) and National Natural Science Youth Fund of China (41905089).
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Gan, R., Yang, Y., Xie, Q. et al. Assimilation of Radar and Cloud-to-Ground Lightning Data Using WRF-3DVar Combined with the Physical Initialization Method—A Case Study of a Mesoscale Convective System. J Meteorol Res 35, 329–342 (2021). https://doi.org/10.1007/s13351-021-0092-4
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DOI: https://doi.org/10.1007/s13351-021-0092-4