The global 1/25th degree HYCOM simulation used in Arbic et al. 2022 was run on 
Navy supercomputers.  Hourly global snapshots of the surface and 15 m 
u and v velocity components from this run were transferred to the University 
of Michigan (U-M) OSiRIS storage facility (https://arc.umich.edu/osiris/) by 
Jay Shriver of Naval Research Laboratory.  The files on OSiRIS can be accessed 
by anyone as long as they first contact Brian Arbic (arbic@umich.edu).

The global hourly velocity files were then moved from the OSiRIS storage 
facility to this directory, belonging to Lingxiao Guan, on Brian Arbic's 
computer system at U-M:

/huron/lxguan/Raw_Velocities/

The 8759 global hourly velocity snapshot files have names such as:
102_archv.2014_<X>_<Y>_uv_0+15m.nc

"X" runs from 001 to 365
"Y" runs from 00 to 23 (except that 00 is missing for the first day)

Each hourly file has an approximate size of 2.04 GB, corresponding to 
9000*7055*4*8 bytes, where 9000 is the number of model grid points
in the east-west (zonal) direction, 7055 is the number of grid points
in the north-sorth (meridional) direction, 4 represents the number
of variables (u and v, 0 and 15 m), and 8 is the number of bits per
double precision byte.  Together the 8759 files take up 17.8 TB of
storage.

The code make_pixels_sideP.py, run via the script vel_proj_job.sh,
reads every sixth grid point in the zonal and meridional directions,
and creates time series on the truncated grid.  The time series are
stored in the following directory, also belonging to Lingxiao Guan,
on Brian Arbic's U-M system:

/huron/lxguan/Downsampled/

The 150 time series files have the following names:

102_archv.2014_<Z>_uv_0+15m.mat

where <Z> runs from 0000 to 1490 in steps of 0010.

Each of the 150 files contains time series for 10 longitudes on the truncated 
grid, and is about 3.3 GB in size, corresponding to 
10*1176*4*8759*8 bytes, where 10 is the number of sampled model grid points
in the east-west (zonal) direction, 1176 is the number of sampled grid points
in the north-sorth (meridional) direction, 4 represents the number
of variables (u and v, 0 and 15 m), 8759 is the number of hours in a year
(minus the missing first hour), and 8 is the number of bits per double 
precision byte.  Together the 150 files take up about 494.4 GB of storage,
about 1/36th of the storage in the RawVelocities directory, after downsampling
by a factor of 6 in each horizontal direction.

None of the files above are in this repository because of their large
collective size and because they essentially duplicate information stored
on OSiRIS, which is publicly available.