Source: /Users/anthony/Data/Taiwan/ET2017_HFR__01-Oct-2021.nc Format: classic Global Attributes: CREATION_DATE = '01-Oct-2021' creator_name = 'A. Kirincich' creator_email = 'akirincich@whoi.edu' naming_authority = 'mvco.whoi.edu' EXPERIMENT = '2017 HF Radar observations of the East Taiwan Coast.' Abstract = 'High-frequency radar-based observations of surface currents along the east coast of Taiwan, obtained over a 50-day period in early 2017, are used to examine the occurrence, generation, and downstream advection of submesoscale eddies in the Kuroshio. Measured at an effective depth of 2 m and radial resolution of 3 km from four land-based HF radar systems spanning an 250-km along-stream distance, the surface current observations reveal the instantaneous position of the Kuroshio on hourly time scales as well as the occurrence of numerous high relative vorticity features. Vortex features with spatial scales of 5-20 km were concentrated in the first 30 km offshore, with many created at the southern tip of Taiwan on tidal timescales. Most features, with relative vorticities approaching zeta/f=1, translated northward along the coast at the speed of the Kuroshio itself and were coherent over the 250-km length of the Taiwanese coastline. Both tides and regional winds appear to influence when long-lived features form, and the offshore advection of surface waters by the vortices are observable in intermittent Satellite images of surface chlorophyll. While most features are advected northward with the current, a submarine ridge acts to impede the flow, scattering northward moving features and causing occasional southward-migrating vortices.' DESCRIPTION = 'The surface current observations used here were obtained from four long-range (4 MHz transmit frequency) land-based coastal radar systems, operated by the Taiwan Ocean Research Institute (TORI) and the National Taiwan University (NTU). All systems were Codar Ocean Sensors SeaSondes, with the three southern stations operated by TORI, and the northern-most station by NTU. Collected over the time period spanning February 1st to March 26th, 2017, the hourly observations of Doppler cross-spectra had a radial resolution of 3 km. Horizontal resolution was dependent on both the resolution of the measured antenna patterns (1 degree in azimuth) as well as the inherent azimuthal resolution of the radar returns themselves. ' DATA_ORIGIN = 'Taiwan Ocean Radar Observing System (TOROS) ocean current radar team and the National Taiwan University (NTU)' FUNDING_SOURCE = 'HF Radar observations used here were funded by Taiwan's National Applied Research Laboratories as well as the National Taiwan University. A. Kirincich was funded by the U.S. Office of Naval Research under contract #N000141712761.' COORD_SYSTEM = 'GEOGRAPHIC' platform_type = 'High Frequency Radar' INST_TYPE = 'Codar Ocean Sensors Seasonde HF Radar' Conventions = 'CF-1.6' History = 'Converted to netCDF via MATLAB by A. Kirincich' min_latitude = 21.5114 min_latitude_units = 'degree_north' max_latitude = 24.6886 max_latitude_units = 'degree_north' min_longitude = 120.9544 min_longitude_units = 'degree_east' max_longitude = 122.9847 max_longitude_units = 'degree_east' Dimensions: lon = 53 lat = 89 t = 1296 Variables: datetime Size: 1296x1 Dimensions: t Datatype: double Attributes: variable = 'Serial Date Number' calendar = 'gregorian' units = 'days since 1970-01-01T00:00:00Z' Longitude Size: 53x1 Dimensions: lon Datatype: double Attributes: variable = 'Gridded Longitude' standard_name = 'longitude' units = 'degrees_east' Latitude Size: 89x1 Dimensions: lat Datatype: double Attributes: variable = 'Gridded Latitude' standard_name = 'latitude' units = 'degrees_north' East_vel Size: 53x89x1296 Dimensions: lon,lat,t Datatype: double Attributes: variable = 'East_vel' coordinates = 'Longitude Latitude datetime' standard_name = 'eastward_sea_water_velocity' units = 'm s-1' measurement_depth = 0.5 measurement_depth_units = 'm' missing_value = '999.0' North_vel Size: 53x89x1296 Dimensions: lon,lat,t Datatype: double Attributes: variable = 'North_vel' coordinates = 'Longitude Latitude datetime' standard_name = 'northward_sea_water_velocity' units = 'm s-1' measurement_depth = 0.5 measurement_depth_units = 'm' missing_value = '999.0' East_err Size: 53x89x1296 Dimensions: lon,lat,t Datatype: double Attributes: variable = 'East_err' coordinates = 'Longitude Latitude datetime' units = 'm2 s-2' missing_value = '999.0' North_err Size: 53x89x1296 Dimensions: lon,lat,t Datatype: double Attributes: variable = 'North_err' coordinates = 'Longitude Latitude datetime' units = 'm2 s-2' missing_value = '999.0' err_cov Size: 53x89x1296 Dimensions: lon,lat,t Datatype: double Attributes: variable = 'err_cov' coordinates = 'Longitude Latitude datetime' units = 'm2 s-2' missing_value = '999.0' total_err Size: 53x89x1296 Dimensions: lon,lat,t Datatype: double Attributes: variable = 'total_err' coordinates = 'Longitude Latitude datetime' units = 'm s-1' missing_value = '999.0'