Terasaki, K., and T. Miyoshi, 2017: Assimilating AMSU-A radiances with the NICAM-LETKF. J. Meteor. Soc. Japan, 95,
Early Online Release Graphical Abstract with highlights
- This study developed an observation operator to assimilate the Advanced Microwave Sounding Unit-A (AMSU-A) brightness temperature observations with the Nonhydrostatic Icosahedral Atmospheric Model (NICAM)-based Local Ensemble Transform Kalman Filter (LETKF) using the radiative transfer model RTTOV (Radiative Transfer for the TOVS (TIROS Operational Vertical Sounder)) version 11.1.
- An adaptive bias correction method was applied for both airmass and scan biases, or the biases originating from the atmospheric state and scan position.
- Comparing the two experiments with and without the AMSU-A radiances, we find that the adaptive bias correction methods work appropriately, and that the analysis is significantly improved by assimilating the AMSU-A radiances (Fig. 1).