WIND VARIABILITY AT TIME SCALES FROM HOURS TO DIURNAL TO ANNUAL PLAYS A KEY ROLE IN MODULATING THE EXCHANGE OF MOMENTUM HEAT AND FRESHWATER ACROSS THE AIR-SEA INTERFACE. THE INTERACTION OF DIURNAL SURFACE BUOYANCY FLUXES WITH HIGH-FREQUENCY AND/OR DIURNAL WINDS CAN DRIVE VARIATIONS IN MIXED-LAYER DEPTH AND TURBULENT MIXING. THESE PROCESSES CAN RESULT IN A SIGNIFICANT RECTIFIED EFFECT ON OCEAN HEAT UPTAKE ULTIMATELY INFLUENCING UPPER OCEAN TEMPERATURES. WINDS ARE KNOWN TO EXPERIENCE A STATISTICALLY SIGNIFICANT DIURNAL CYCLE THROUGHOUT THE TROPICS. THIS DIURNAL CYCLE CAN BE CHALLENGING TO EVALUATE FROM STANDARD SUN-SYNCHRONOUS METEOROLOGICAL SATELLITES WHICH MEASURE AT THE NYQUIST FREQUENCY OF THE DIURNAL CYCLE. NEW RESULTS BASED ON HIGHER-FREQUENCY SAMPLING FROM MOORINGS SHOW THAT THE AMPLITUDE OF THE DIURNAL CYCLE IS NOT STATIONARY BUT IS MODULATED BY THE ANNUAL CYCLE. WE PROPOSE TO USE A COMBINATION OF WIND OBSERVATIONS TO CHARACTERIZE HIGH-FREQUENCY AND DIURNAL WIND VARIABILITY AND TO EXAMINE THE SEASONAL MODULATION OF DIURNAL WIND VARIABILITY. OUR GOALS ARE TO TAKE ADVANTAGE OF THE HIGH TEMPORAL COVERAGE PROVIDED BY MOORINGS IN COMBINATION WITH THE GREATER SPATIAL COVERAGE BUT SPARSER TEMPORAL COVERAGE FROM SATELLITES IN ORDER TO CHARACTERIZE WIND VARIABILITY. WE PARTICULARLY AIM TO CHARACTERIZE THE NON-STATIONARITY OF THE DIURNAL AND SEASONAL CYCLE BOTH IN MOORING DATA (USING THE TAO RAMA PIRATA AND OOI MOORINGS) AND ALSO IN SATELLITE OBSERVATIONS (WORKING WITH VECTOR WINDS DATA FROM QUIKSCAT ASCAT RAPIDSCAT OSCAT SEAWINDS AND COWVR AS WELL AS PASSIVE MICROWAVE WIND SPEED OBSERVATIONS AND ACTIVE SCATTERING SYSTEMS SUCH AS CYGNSS AND NADIR ALTIMETRY.) OUR BROADER OBJECTIVES IN CHARACTERIZING HIGH-FREQUENCY AND DIURNAL WINDS ARE THREE FOLD. FIRST WE AIM TO DEVELOP A REFINED ASSESSMENT OF DIURNAL VARIABILITY INCLUDING EXAMINING TEMPORAL CHANGES IN THE DIURNAL WIND AMPLITUDE. IMPROVING THE REPRESENTATION OF THE DIURNAL CYCLE HAS EMERGED AS ONE OF THE CHALLENGES TO BE ADDRESSED IN IMPROVING MAPPED WIND PRODUCTS SUCH AS THE 6-HOURLY CROSS-CALIBRATED MULTI-PLATFORM (CCMP) GRIDDED SURFACE VECTOR WINDS AND OUR ANALYSIS WILL INFORM THIS PROCESS. SECOND WE PLAN TO CHARACTERIZE THE PORTION OF HIGH-FREQUENCY WINDS THAT IS NEITHER DIURNAL NOR SEMI-DIURNAL. THIRD WE PLAN TO USE THE DETAILED ASSESSMENT OF HIGH-FREQUENCY AND DIURNAL WINDS TO EVALUATE THE IMPACT OF TIME-VARYING WINDS ON AIR-SEA EXCHANGES OF HEAT AND OTHER PROPERTIES.