9:00 AM - 9:15 AM
[ACG46-19] Accomplishments from 3-years of Global Precipitation Measurement (GPM) Data: NASA’s Perspective
Keywords:Earth, Satellite, Precipitation, GPM
The GPM-CO spacecraft is an advanced successor to the Tropical Rainfall Measuring Mission (TRMM), with additional channels on both the DPR and GMI with capabilities to sense light rain and falling snow (Hou et al., 2014, Hou et al., 2008). The GPM-CO was launched at 18:37 UTC 27 February 2014 and operates in a non-sun-synchronous orbit with an inclination angle of 65° (Fig. 2). The prime mission lifetime (instrument design life) is 2 months for checkout and 3 years for operations, but operations could last 15-24 years according to fuel projections in November 2016 (see Appendix E for fuel charts) assuming the instruments/spacecraft systems (e.g., batteries) do not fail and fuel requirements do not increase. The inclined orbit allows the GPM-CO to sample precipitation across all hours of the day from the Tropics to the Arctic and Antarctic Circles. GPM expands TRMM’s reach not only in terms of global coverage, but also through more sophisticated satellite instrumentation, systematic inter-calibration of datasets from other microwave radiometers, refined merged precipitation data sets, reduced latency for delivering data products, simplified data access, expanded global ground-validation efforts, and integrated user applications. Because of the application focus of GPM, the public release of precipitation products is required in NRT (1-5 hours after the observations are downlinked to the ground stations).
Accomplishments of the Prime Mission lifetime (March 2014-May 2017) can be categorized into four topics: Instrument calibration, Improvements in the Retrieval Algorithm, Progress toward the Scientific Objectives of the GPM mission, and Meeting the GPM Level 1 Mission Requirements. These accomplishments and future activities will be presented.