Impact of Aeolus DWL Data Assimilation in the JMA’s Global Data Assimilation System on Forecasting Skills for Typhoons
The horizontal line of sight (HLOS) wind data from Aeolus Doppler Wind Lidar (DWL) is available from the European Space Agency (ESA) Earth Online Portal. Assimilation experiments of this HLOS data were conducted using JMA’s global data assimilation (DA) system. The experiment term is from July to October 2020 including 18 typhoon events.
The result of the assimilation experiment showed positive impacts of Aeolus HLOS wind data on the analysis accuracy and forecasting scores of not only wind speed but also geo potential height, temperature and specific humidity Improvement of typhoon track forecasting was found suggesting the improved environment forecasting. During the experiment term, Aeolus observed wind shears around some typhoons. The Aeolus assimilation seemed to intensify the divergence over the top of typhoons. The details of assessment and assimilation experiments will be shown in the presentation.
