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THREE DISTINCT DYNAMICAL PROCESSES MOTIVATE AND WILL SERVE AS CASE STUDIES TO GUIDE OUR WORK ON THIS. IN OUR CURRENT OSTST PROJECT WE HAVE BEEN RECONCILING OBSERVATIONS FROM SATELLITE ALTIMETRY WITH NUMERICAL PROCESS MODEL OUTPUT  AND SOME SIGNIFICANT CHALLENGES HAVE ARISEN THAT MOTIVATE THE PRESENT PROPOSAL. STRONG EVIDENCE FOR 30-35 DAY BAROTROPIC ROSSBY WAVES RADIATING NORTHWARD FROM TROPICAL INSTABILITY WAVES (TIWS) WAS PREVIOUSLY PUBLISHED BY THE PI. OUR MORE DETAILED RECENT ANALYSIS OF THE GRIDDED AVISO PRODUCT SHOWS THAT SSH VARIABILITY COHERENT WITH THE TIWS CAN BE FOUND THROUGHOUT MOST OF THE NORTH PACIFIC; AS FAR POLEWARD AS THE GULF OF ALASKA AND THE ALEUTIAN ISLANDS. THE IMPLICATION THAT THIS WIDE-SPREAD COHERENCE IS DUE TO THE PREVIOUSLY IDENTIFIED BAROTROPIC ROSSBY WAVES IS SUPPORTED BY THE COHERENCE PATTERNS  WITH ONE PUZZLING EXCEPTION. THE OBSERVED SSH VARIANCE IN THIS PERIOD BAND DECREASES BY A FACTOR OF ABOUT 100 IN THE 20-40  LATITUDE BAND  AND IT INCREASES AGAIN AFTER THE WAVES PROPAGATE THROUGH THE REGION AND REACH HIGHER LATITUDES. WE FOLLOWED SEVERAL CONJECTURES FOR EXPLAINING THIS BEHAVIOR  BUT WE WERE UNABLE TO REPRODUCE THIS LOCALIZED MINIMUM WITH PROCESS MODELS OR COME UP WITH A PLAUSIBLE WAY OF RATIONALIZING ITS EXISTENCE. WE ONLY RECENTLY DISCOVERED THAT THE MINIMUM IS PRODUCED BY THE SPATIAL DEPENDENCE OF THE TIME SCALES INCORPORATED IN AVISO S OBJECTIVE MAPPING ALGORITHM. AN INDEPENDENT MAPPING OF THE ALONG-TRACK DATA WITH A SPATIALLY UNIFORM MAPPING TIMESCALE PRODUCES MUCH BETTER AGREEMENT WITH MODEL PREDICTIONS AND PHYSICAL REASONING. THE ABOVE EXAMPLE HIGHLIGHTS A PARTICULAR LIMITATION RESULTING FROM THE ASSUMPTIONS THAT GO INTO THE AVISO GRIDDED ALTIMETRY PRODUCT. ANOTHER POTENTIAL WEAKNESS CONCERNS ASSUMPTIONS ABOUT SSH PROPAGATION SPEEDS. AT EACH LOCATION  THE AVISO MAPPING SCHEME ASSUMES A PROPAGATION SPEED BASED ON THEORY AND OBSERVATIONS. WHILE THIS MAY REPRESENT THE DOMINANT PROPAGATION CHARACTERISTICS AT MOST LATITUDES  THERE ARE IMPORTANT REGIONS OF THE WORLD OCEANS (THE SOUTHERN OCEAN AND THE KUROSHIO EXTENSION  FOR EXAMPLE) WHERE SIMULTANEOUS EASTWARD AND WESTWARD PROPAGATION CAN BE BOTH PREDICTED AND OBSERVED  BUT IS NOT HANDLED CONSISTENTLY IN THE A PRIORI AUTOCOVARIANCE FUNCTION USED FOR THE AVISO MAPPING. WE HAVE DISCUSSED THESE ISSUES WITH THE PERSONNEL AT CLS RESPONSIBLE FOR THE AVISO/DUACS PROCESSING  AND HAVE DEVELOPED A COLLABORATIVE PLAN TO WORK TOWARD IMPROVING THE AVISO MAPPING ALGORITHM. OUR PART OF THE EFFORT WILL ENTAIL DYNAMICAL MODELING AND INDEPENDENT ANALYSIS OF AVAILABLE ALONG-TRACK ALTIMETRY DATA TO QUANTITATIVELY DESCRIBE AND UNDERSTAND OCEAN DYNAMICS PRESENTLY NOT REPRESENTED IN THE AVISO MAPPING AUTOCOVARIANCE FUNCTIONS AND SUBSEQUENT WORK TO CONSIDER DIFFERENT WAYS OF HANDLING SUCH SIGNALS IN AN OBJECTIVE MAPPING TO PRODUCE AN IMPROVED SSH PRODUCT.","funder_award_id":"NNX17AH54G","funder_id":"https://openalex.org/F4320306101","funder_display_name":"National Aeronautics and Space Administration"},{"id":"https://openalex.org/G952954170","display_name":"THE LONG-TERM GOAL OF THIS PROJECT IS TO OBSERVE AND IMPROVE UNDERSTANDING OF WIND FORCING AND SEA-SURFACE HEIGHT VARIABILITY AT HIGH FREQUENCIES (PE","funder_award_id":"NNX14AM71G","funder_id":"https://openalex.org/F4320306101","funder_display_name":"National Aeronautics and Space Administration"}],"funders":[{"id":"https://openalex.org/F4320306101","display_name":"National Aeronautics and Space 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