TRMM/TMI Michael Blecha EECS 823.  TMI : TRMM Microwave Imager  PR: Precipitation Radar  VIRS: Visible and Infrared Sensor  CERES: Cloud and Earth.

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Presentation transcript:

TRMM/TMI Michael Blecha EECS 823

 TMI : TRMM Microwave Imager  PR: Precipitation Radar  VIRS: Visible and Infrared Sensor  CERES: Cloud and Earth Radiant Energy Sensor  LIR: Lighting Imaging Sensor TRMM Instruments

ChannelFrequencyPolarization GHzVertical GHzHorizontal GHzVertical GHzHorizontal GHzVertical GHzVertical GHzHorizontal GHzVertical GHzHorizontal TRMM/TMI Channels

 Orbit height of 402km  Oriented 49 o relative to nadir  Beam width and effective area different per frequency  Dual calibration: on board “hot load” and space as cold load TRMM/TMI Orientation Figure 1: TRMM (Kummerow et al )

 36.1 scans per minute  16 orbits per day  Semi-equatorial orbit (35 o incline with respect to the equator) TRMM/TMI Orbit Figure 2: Daily orbit (NASA)

TRMM/TMI Data Products TMI 1A: Raw TMI Signal PR 1A: Raw PR Signal 1B11: Calibrated Antenna Temperature 1B21: PR Power 2A12: Rainfall Structure 2A23: Rainfall Occurrences 3A11: Combined Monthly Rainfall 2B31: Combined Rainfall Structure 1C12: PR Reflectivity

 Currently on version 7 of algorithm  Conversion of brightness temperature to rainfall rate  Goddard Profiling Algorithm (GPROF)  Land algorithm separate from ocean algorithm  Land algorithm less accurate because it relies primarily on scattering from the 85G channels  Ocean algorithm uses weighting of scattering and emissive upwelling radiation  Extensive use of cloud models to predict rainfall based on cloud characteristics 1B11 -> 2A12

 Fu, Yunfei, et al. "A feasible method for merging the TRMM microwave imager and precipitation radar data." Journal of Quantitative Spectroscopy and Radiative Transfer (2013):  GES DISC. TRMM Microwave Imager (TMI) LEVEL 1B Calibrated Brightness Temperature (TB) Product. n.d. 5 December  Goddard Space Flight Center. NASA Facts: TRMM Instruments. n.d. 5 December  Kummerow, Christian, et al. "The Evolution of the Goddard Profiling Algorithm (GPROF) for Rainfall Estimation from Passive Microwave Sensors." Journal of Atmospheric and Oceanic Technology (2001):  Kummerow, Christian, William Barnes and Toshiaki Kozu. "The Tropical Rainfall Measuring Mission (TRMM) Sensor Package." Journal of Atmospheric and Oceanic Technology (1998):  Wang, Nai-Yu, et al. "TRMM 2A12 Land Precipitation Product – Status and Future Plans." Journal of the Meteorological Society of Japan (2009): References