92nd American Meteorological Society Annual Meeting (January 22-26, 2012)

Tuesday, 24 January 2012: 2:00 PM
Spectral Calibration for FY-3A MWTS Measurements Using NWP Models
Room 257 (New Orleans Convention Center )
Xiang Wang, Nanjing Univ. of Information Science and Technology, Nanjing, Jiangsu, China; and X. Zou, F. Weng, and R. You

The MicroWave Temperature Sounder (MWTS) on FY-3A has four-channels with designed band central frequencies of 50.3, 53.6, 54.9 and 57.3 GHz, respectively. The central frequency for three upper-level sounding channels is shifted after the satellite launch into orbit. This study investigates the characteristics of MWTS O-B associated with the frequency shift and demonstrates the utility of NWP models for diagnosing microwave instrument anomaly. The O-B is defined as the difference between observed brightness temperatures and simulated brightness temperature from NWP 6 hour forecast fields. Through tuning the central frequency of MWTS in the Community Radiative Transfer Model (CRTM), the MWTS O-B can be made similar to those from MetOp-A/NOAA-18 AMSU-A. It is shown that the adjusted FY-3A MWTS brightness temperatures after central frequency shift match quite well with the MetOp-A/NOAA-18 AMSU-A data at the simultaneous nadir overpass (SNO) locations in both the Arctic and Antarctic.

Supplementary URL: