SMCE HRET14

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(1) Justification to publish on podaac (short description)

The files contain estimates of the baroclinic tidal sea level anomaly and surface
currents at the M2, S2, K1, O1, and N2 frequencies on a regular 1/20th-degree
lat/lon grid. The tidal estimates are useful for researchers who wish to map
or predict baroclinic tides. The estimates are computed by fitting a 
kinematic wave model to all available exact repeat altimetry data and
NOAA Global Drifter Program data throughout the world oceans. Predictions of
the baroclinic tides computed with the associated software may be used to partly
remove aliased baroclinic tidal signals from altimetry data.

Publishing these data on the PODAAC will provide a convenient and stable URL
for many researchers to access these data.

(2) The funding source

NSF Physical Oceanography Program award #1850961 and NASA SWOT Science Team award #80NSSC21K0346.

(3) The number and size of files

The essential HRET version 14 files:

HRET14_SSH_d1.nc 145 MB -- Harmonic constants for the baroclinic sea level anomaly.

HRET14_UV_d1.nc 237 MB -- Harmonic constants for the baroclinic surface currents.

Example input files for demonstrating the use of the tide prediction software:

SWOT_L2_LR_SSH_Expert_018_063_20150404T095346_20150404T104512_DG10_01.nc 13 MBV -- A sample SWOT input file.

6ap0247c075.nc 923 KB -- A sample RADS input file.

driftertrajGPS_d1.nc 37 MB -- A sample GDP input file.

Graphical representation of the HRET14 fields:

M2sfcke.pdf 13 MB -- Hi-resolution image of M2 surface current kinetic energy.

M2sfcke.png 213 KB -- Low-resolution image of M2 surface current kinetic energy.

(4) User community

These files may be used by the altimeter community to compute corrections
intended to remove baroclinic tidal variability from sea level anomaly
observations. Researchers with an interest in ocean surface currents may
also use these data to predict baroclinic tidal surface currents. Such
information may be used to plan observational campaigns or optimize the
design of future surface current mapping satellite missions.

(5) Add one example figure of the data content.

M2sfcke.png and M2sfcke.pdf -- illustrates the mean kinetic energy [m^2/s^2] of the baroclinic
ocean surface currents associated with the M2 tide.

(6) The frequency of data update

We expect to update these models every 3 to 4 years, as additional data for
mapping the tides becomes available.