Beginning on Monday February 04, 2019, the Level 2 and Level 3 GPM GPROF products will be produced with an updated monthly emissivity class file (see developers comments below). PPS will increment the product version for all Level 2 and Level 3 GPROF products starting with the first full orbit on data date February 1, 2019. The current version of these products will cease with data date Jan 31, 2019 and will remain unchanged.
The new production version numbers/ designations will be incremented as shown in the table below.
Data Source Product Version
NOAA20 ATMS V05B
The changes made to this GPROF version update are described (below) by the algorithm developer. Please also refer to the attached ".pdf" file to see the geographic area affected.
Emissivity class repair
A monthly emissivity class file is used within the surface type assignment to define the GPROF surface class and thus select similar database profiles. While examining IMERG data in a new polar stereographic projection, many areas of erroneous precipitation (very high precipitation rates) were observed. This was found to be caused by incomplete and incorrect assignment of the surface type in Northern Canada and Greenland. Using an Autosnow created climatology, these surface types were changed in the GPROF ancillary files to a new snow class, instead of a open water classification. The result greatly reduced the retrievals of anomalous high precipitation, and occur only over the areas highlighted in the following figure. Precipitation retrievals in ALL other areas are not affected.
All products are in the HDF5 format and will use the GPM naming conventions. This new GPM data will appear both in STORM: https://storm.pps.eosdis.nasa.gov/storm/
and on "arthurhou":
Please visit our registration portal for access to GPM data products if you have not previously registered with PPS:
Level 2 and Level 3 GPROF product release notes and other documentation can be found on the PPS public website at:
Other level 2 / level 3 documentation can be found at:
on the PPS public website:
Please contact the PPS Helpdesk if you have any questions, comments or concerns.