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Global Attributes:	CREATION_DATE: 09-Aug-2018 creator_name: A. Kirincich creator_email: akirincich@whoi.edu naming_authority: Woods Hole Oceanographic Institution EXPERIMENT: ALPHA Abstract: This data was collected by Kirincich as part of the NSF HAZARD-SEES ALPHA project. The data consists of estimates of the near-surface horizontal (East and North) ocean currents made via High Frequency (HF) radar-based remote sensing of the Ocean backscatter spectrum. The effective measurement depth of the WHOI HF radars is 0.5 m below the ocean surface. DESCRIPTION: The WHOI HF radar system, as operated during the experiment, consisted of 3 land-based sites spaced at ~10km intervals along the south side of Martha?s Vineyard, MA, and one site on Nantucket, MA. This combination of 16 MHz and 25 MHz systems were run using a combination of transmit bandwidth and power to allow resolutions of 800m and 1.5-2 km and ranges of 30 km and 60 km for the MVCO and NES grids respectively (see Kirincich et al, 2016, in prep for details). Received doppler spectra from each were processed using the advanced methods of Kirincich et al. (2012, JOTA, 2018, JOTA in prep) into radial velocity estimates every 15 min based on a 24 min averaging window for the 25 MHz systems and every 30 m for the 16 MHz systems. Radial velocity estimates were quality controlled before inclusion into the vector velocity estimates. using standard time-series QC techniques. These data were combined into vector velocities on a uniform resolution grid, given in Latitude and Longitude coordinates every 30 mins, using a unique weighted least squares technique that incorporated employed non-velocity based signal quality metrics to weight the data to increase the accuracy of the final product. The spatial extent of the vector velocities was limited to theoretical Geometrical Dilution of Precision (GDOP) values less than 2. An error estimate for the East, North, and total (norm) of the vector velocity components is given. This estimate uses the radial velocity error estimates (the weighted standard deviation of the individual HF radar radial returns found within each 5 degree azimuthal bin average) in a standard (Numerical Recipes) vector error calculation. DATA_ORIGIN: Woods Hole Oceanographic Institution, Department of Physical Oceanography FUNDING_SOURCE: The observations used in this study were supported by NSF OCE Grant #1332626 and internal funding from the Woods Hole Oceanographic Institution. 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: 41.08644 min_latitude_units: degree_north max_latitude: 41.33856 max_latitude_units: degree_north min_longitude: -70.795554 min_longitude_units: degree_east max_longitude: -70.404446 max_longitude_units: degree_east

Variables:	Longitude: Array of 64 bit Reals [lon = 0..41] lon: variable: Gridded Longitude standard_name: longitude coordinate: lon units: degrees_east
	Latitude: Array of 64 bit Reals [lat = 0..35] lat: variable: Gridded Latitude coordinate: lat standard_name: latitude units: degrees_north
	t: Array of 32 bit Integers [t = 0..14695] t:
	datetime: Array of 64 bit Reals [t = 0..14695] t: variable: Serial Date Number calendar: gregorian units: days since 1970-01-01T00:00:00Z coordinate: t
	East_vel: Array of 64 bit Reals [t = 0..14695][lat = 0..35][lon = 0..41] t: lat: lon: 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: Array of 64 bit Reals [t = 0..14695][lat = 0..35][lon = 0..41] t: lat: lon: variable: North_vel standard_name: northward_sea_water_velocity units: m s-1
	East_err: Array of 64 bit Reals [t = 0..14695][lat = 0..35][lon = 0..41] t: lat: lon: variable: East_err units: m2 s-2 missing_value: 999.0
	North_err: Array of 64 bit Reals [t = 0..14695][lat = 0..35][lon = 0..41] t: lat: lon: variable: North_err units: m2 s-2 missing_value: 999.0
	err_cov: Array of 64 bit Reals [t = 0..14695][lat = 0..35][lon = 0..41] t: lat: lon: variable: err_cov units: m2 s-2 missing_value: 999.0
	total_err: Array of 64 bit Reals [t = 0..14695][lat = 0..35][lon = 0..41] t: lat: lon: variable: total_err units: m s-1 missing_value: 999.0

For questions or comments about this dataset, contact the administrator of this server [Siavash Ameli] at: sameli@berkeley.edu

For questions or comments about the OPeNDAP service bundled with the TDS, email THREDDS support at: support-thredds@unidata.ucar.edu

DDS:

Dataset {
    Float64 Longitude[lon = 42];
    Float64 Latitude[lat = 36];
    Int32 t[t = 14696];
    Float64 datetime[t = 14696];
    Float64 East_vel[t = 14696][lat = 36][lon = 42];
    Float64 North_vel[t = 14696][lat = 36][lon = 42];
    Float64 East_err[t = 14696][lat = 36][lon = 42];
    Float64 North_err[t = 14696][lat = 36][lon = 42];
    Float64 err_cov[t = 14696][lat = 36][lon = 42];
    Float64 total_err[t = 14696][lat = 36][lon = 42];
} public/WHOI/Archive/WHOI-HFR/TOTL_MVCO.ncml;

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