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Jason-2 Wet Tropospheric Coastal Performance

Jason-2 Wet Tropospheric Coastal Performance. Shannon Brown JPL. Jason-2 Radiometer Improvements. AMR. TMR. JMR. Several significant improvements made to radiometer on Jason-2 AMR - Advanced Microwave Radiometer

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Jason-2 Wet Tropospheric Coastal Performance

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  1. Jason-2 Wet Tropospheric Coastal Performance Shannon BrownJPL

  2. Jason-2 Radiometer Improvements AMR TMR JMR • Several significant improvements made to radiometer on Jason-2 • AMR - Advanced Microwave Radiometer • 1 meter, unblocked reflector to improve coastal resolution and reduce geographically correlated errors • Compared to partially blocked 0.6 m reflector for JMR/TMR • Improved land flagging • Improved beam matching algorithm

  3. Jason-2 AMR AMR TMR JMR

  4. AMR Coastal Performance • Spatial resolution nearly doubled from TMR and JMR • ~26 km for AMR compared to ~50 km for JMR/TMR • 98-99% of energy received within 75 km of boresight, compared to about 92-93% for TMR/JMR Jason-2 AMR JMR/TMR

  5. AMR Coastal Performance • AMR land flagging algorithm based on beam weighted land fraction in the main beam, instead of a constant radial distance to land • Not all land is equal • Flags data that will have errors > 5 mm • AMR beam matching algorithm matches beams to 23.8 GHz footprint, instead of degrading resolution of all channels to the 18.7 GHz footprint

  6. Coastal Performance • Along track averaging can improve coastal approach for preferred land/ground track orientations • Additional improvements may be made through correction algorithms based on pattern weighted main beam land fractions • CLS (PISTACH) and JPL (proposed to OSTST) ~10 km approach at Harvest estimated for AMR ~20-25 km approach estimated for worst case

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