Ocean Surface Topography Mission Shannon Brown JPL Jason-2 Wet Tropospheric Coastal Performance.

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Presentation transcript:

Ocean Surface Topography Mission Shannon Brown JPL Jason-2 Wet Tropospheric Coastal Performance

Ocean Surface Topography Mission Jason-2 Radiometer Improvements 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 TMR JMR AMR

Ocean Surface Topography Mission Jason-2 AMR JMR TMR AMR

Ocean Surface Topography Mission 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 JMR/TMR Jason-2 AMR

Ocean Surface Topography Mission 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

Ocean Surface Topography Mission 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