资源环境科技发展态势分析平台

Radiance-based comparison between model-simulated and satellite-observed atmosphere shows its unique advantage for model evaluation. This study couples a fast radiative transfer model, namely, the community radiative transfer model, and the Weather Research and Forecasting (WRF) to generate synthetic satellite observed infrared (IR) brightness temperatures (BTs) over East Asia. Simulated IR BTs are used to evaluate WRF cloud properties by direct comparison with observations from the Visible and Infrared Spin-Scan Radiometer (onboard the FengYun-2E geostationary satellite). A deep cyclone over North China is investigated as our case study. The simulated and observed BTs in the 6.8-m channel demonstrate agreement with an averaged bias of <3K, whereas the performances in two IR window channels are relatively poor with averaged BT differences almost 10K. For typical precipitation regions, BT differences between the 6.8- and 10.8-m channels indicate that the WRF simulation underestimates low- to midlevel clouds but reproduces high-level clouds better. Overall, the WRF has solid capabilities to capture the cloud characteristics broadly, whereas some limitations are shown in the cloud temporal and variation cloud cover, especially 3days after the WRF initialization.