PO.DAAC Data Users,
In March 2014 the Tellus ocean mass grid datasets (including EOF grids) were
updated through a reprocessing with numerous enhancements including a new
file naming convention, which includes version identification for specific
processing releases (e.g., DSTvDPC1401) along with the hierarchical legacy
release identification (e.g., RL05). The purpose of this new file naming
convention is to provide more self-description, provenance and traceability
of each file.
An explanation of this new file naming convention is provided here:
ftp://podaac.jpl.nasa.gov/allData/tellus/L3/ocean_mass/RL05/README.txt
In addition, the following changes should be noted:
1. Datasets only utilize a single averaging radius of 500 km.
2. RL05 Version DSTvDPC1401 uses an updated geocenter correction (see: ftp://podaac.jpl.nasa.gov/allData/tellus/L2/degree_1/ for details) that fixes a small bug in the previous geocenter estimate.
3. As of GRCTellus RL05 version DSTvDPC1401, the area-weighted global mean is set to zero. To compute global ocean mass from GRACE, one must use non-destriped and un-smoothed data, and should mask out any ocean areas within 300 km of land points to avoid land leakage and biases. A time series of Global Mean Ocean Mass will soon be provided.
Caution: The gridded GRCTellus ocean maps are optimized to examine
regional ocean bottom pressure (OBP) variations and are NOT intended to be
spatially averaged to determine global mean ocean mass.
In response to this update, the netCDF, ASCII, GIF, and animated GIF datasets
have been split into three separate dataset entries via the PO.DAAC web
portal, corresponding to: CSR, GFZ, and JPL.
For a list of Tellus ocean mass grid datasets, including EOF grids, via the web portal, please visit: http://podaac.jpl.nasa.gov/datasetlist?ids=&values=&search=tellus+%2B%22ocean+mass%22
To access the complete list of Tellus dataset via the web portal, please
visit: http://podaac.jpl.nasa.gov/datasetlist?ids=Collections&values=TELLUS
If you have any questions or concerns regarding this update, please contact
podaac@podaac.jpl.nasa.gov
Respectfully,
PO.DAAC User Services