Simulation performance comparison of Rttov-gb with Monortm using numerical weather prediction model data.
Abstract
Ground-based Microwave Radiometer (GMWR) that observes vertical profiles of atmospheric temperature and, humidity in real-time and with high resolution near the surface can complement radiosonde observations. High resolution profiles of GMWR are useful in understanding of thermal, micro physical characteristics for extreme weather phenomenon and improve prediction performances through assimilation in Numerical Weather Prediction Model. In this study in order to develop the operational data assimilation system using radiometer data, two forward models (Rttov-gb and Monortm) are used. Brightness temperatures (Tb) computed with Rttov-gb and Monortm have been compared with GMWR observations. Data are obtained from a ground-based microwave radiometer installed at the Changwon station during 1 to 31 December 2013. NWP data from Klaps (Korea Local-area Analysis and Prediction System) are used during the same periods. RMSE of GMWR observations and Tbs simulated with both forward models show lower values (about 2.8) at some frequencies of the oxygen absorption band (53.86 58 GHz). However, Tbs simulated with Rttov-gb show lower RMSE in 22.24 23.84 GHz and higher correlation coefficients than Monortm simulations. Rttov-gb show a negative bias, while the Monortm have positive bias at the vapor absorption band (22.24 27.84 GHz). It is found that error is relatively high in Monortm model simulations. But there is not a big difference of errors between the two. In the future, it will apply longer periods so as to analyze the characterizations of Tb simulations.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A23I2978S
- Keywords:
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- 3315 Data assimilation;
- ATMOSPHERIC PROCESSESDE: 3336 Numerical approximations and analyses;
- ATMOSPHERIC PROCESSESDE: 3372 Tropical cyclones;
- ATMOSPHERIC PROCESSESDE: 0520 Data analysis: algorithms and implementation;
- COMPUTATIONAL GEOPHYSICS