The Goddard Earth Sciences Data and Information Services Center (GES DISC), in coordination with the Global Precipitation Measurement (GPM) mission and the Precipitation Processing System (PPS), is pleased to announce the release of the Global Precipitation Mission (GPM) Level-2 and -3 Goddard Profiling Algorithm (GPROF) data. Launched on February 27, 2014, the GPM mission is an international network of satellites that provide the next-generation global observations of rain and snow. The Level 2 orbital data consist of precipitation products from GMI, TMI, ATMS, MHS, SAPHIR, AMSR2, and SSMIS (acronym key below) using the GPM GMI as the reference standard to ensure the consistency among global precipitation retrieval and climate studies.
You can access the data through the Data Holdings Web Interface for Level-2 and Level-3 GPROF products, which contains access to the data, documentation and services for each product. You can also access the products directly through the following:
Figure 1 is a sample of the Level-2 GPM GPROF products (2A.GPM.GMI.GPROF2014v1-4.20140703-S103637-E120910.001957.V03B.HDF5), showing surface precipitation, cloud water path and ice water path for the 1st Atlantic hurricane in 2014, Hurricane Arthur, near South Carolina and Georgia coasts on July 3, 2014. Hurricane Arthur has been featured in the NASA PMM web page. For details, visit, http://pmm.nasa.gov/articles/gpm-satellite-sees-first-atlantic-hurricane
Figure 1. Parameters from the Level-2 GPROF-GMI product (data file: 2A.GPM.GMI.GPROF2014v1-4.20140703-S103637-E120910.001957.V03B.HDF5): (a) surface precipitation; (b) cloud water path; and (c) ice water path, showing Hurricane Arthur near the South Carolina and Georgia coasts on July 3, 2014. Click on the image to view this LARGE image full-size.
Caveats (from PPS):
- Intercalibration of the 1C products from partner radiometers is still being done with the at-launch approach which uses TMI as the calibration reference standard. That is, TMI and GMI, currently have different absolute calibrations
- Some RFI and moon intrusions into the cold load are still being worked on. Other issues may also be present so Science Team members are urged to immediately report any artifacts in the data.
- Users should refrain from publishing using this data as it is likely to change. Reprocessed data will be made available with a more refined calibration in September 2014.
- Visit http://pps.gsfc.nasa.gov/Documents/IntroductionToDataProducts.pdf for additional caveats and limitations.
For further reading:
GMI - GPM Microwave Imager
TMI - Tropical Rainfall Measuring Mission Microwave Imager
ATMS - Advanced Technology Microwave Sounder
MHS - Microwave Humidity Sounder
SAPHIR - Sondeur Atmosphérique du Profil d'Humidité Intertropicale par Radiométrie
AMSR2 - Advanced Microwave Scanning Radiometer - 2
SSMIS - Special Sensor Microwave Imager/Sounder