Precipitation Processing System (PPS) servers will be down for extended maintenance from Tuesday, September 22nd through Thursday September 24th. During this time the PPS websites, the PMM Publisher API, and the GPM research data server (arthurhou) will be unavailable. The GPM near real-time server (jsimpson) and satellite data collection will not be affected. Click here to learn more.

PMM

Content which is not specifically affiliated with GPM or TRMM, but which is about the Precipitation Measurement Missions in general.

GPM flying over Earth with a data swath visualized.
Precipitation radiometers provide additional degrees of freedom for interpreting rain and snow in clouds through the use of multiple passive frequencies (9 for TRMM and 13 for GPM). Brightness temperatures at each frequency are a measure of everything in their field of view. These frequencies from the low (10 GHz) end to the high (183 GHz) end transition from being sensitive to liquid rain drops to being sensitive to the snow and ice particles. So, simplifying, when there is liquid rain in the cloud column, the low frequency channels will respond; when there is snow the high frequency channels...
GPM flying over Earth with a data swath visualized.
The combined use of coincident active and passive microwave sensor data provides complementary information about the macro and microphysical processes of precipitating clouds which can be used to reduce uncertainties in combined radar/radiometer retrieval algorithms. In simple terms, the combined algorithms use the radiometer signal as a constraint on the attenuation seen by the radar. The combined retrievals produce a hydrometeor profile, particle size distribution and surface parameters for which brightness temperatures and reflectivities are consistent with the actual satellite measurements...
GPM flying over Earth with a data swath visualized.
The unique function of precipitation radars is to provide the three-dimensional structure of rainfall, obtaining high quality rainfall estimates over ocean and land. Radar measurements are typically less sensitive to the surface and provide a nearly direct relationship between radar reflectivities and the physical characteristics of the rain and snow in a cloud. Because of the complexities of operating radar in space, limited channels (frequencies) are designed for the instruments. TRMM has a single frequency radar at the Ku-band particularly sensitive to moderate rain rates. With a single...
GPM flying over Earth with a data swath visualized.
Precipitation Processing System (PPS) PPS provides real-time processing and post-processing of the TRMM science data is performed by the TRMM Science Data and Information System (TSDIS). Working with the TRMM principal investigators and science algorithm developers, PPS maintains the operational science data processing system and ensures the timely processing of all TRMM science instrument data. During routine operations, raw instrument data is received in near real-time by PPS and then processed by the first tier of science algorithms to produce calibrated, swath-level instrument data. Using...
GPM flying over Earth with a data swath visualized.
Precipitation data sets, referred to as "products", are available at a variety of levels which denote the amount of processing that data has been through. These range from the raw instrument data to precipitation model outputs which are mathematically derived using the raw data as an input. Below are the definitions for each level: Level 0 Raw instrument data Level 1A Reconstructed, unprocessed instrument data at full resolution, time referenced, and annotated with ancillary information, including radiometric and geometric calibration coefficients and georeferencing parameters (i.e., platform...
GPM flying over Earth with a data swath visualized.
Coming Soon! This page will allow you to log into the PMM Science Team Portal to collaborate with your fellow scientists. Some of the features we are planning include: The ability to create personal profiles and view the profiles of your teammates. A wiki / forum for communication and sharing of ideas. A tool to schedule meetings with your fellow scientists. A tool for sharing documents and files. Check back here for updates on the status of this tool.

2011 PMM Science Team Meeting

Dates
Location
Denver, Colorado, The Curtis Hotel

This meeting is for NASA PMM Science Team members and invitees.

Mission Affiliation
GPM flying over Earth with a data swath visualized.
Precipitation Measurement Missions - All Provides updates to all PMM website content, including GPM, TRMM, and Ground Validation missions. GPM Provides updates for all GPM-related articles, mission updates, multimedia, and other content. TRMM Provides updates for all TRMM-related articles, mission updates, multimedia, and other content. NEW! GCPEx Campaign Blog Updates from the GPM Cold-season Precipitation Experiment (GCPEx). Learn more about GCPEx.
GPM flying over Earth with a data swath visualized.
GPM on www.nasa.gov The official mission page of the Global Precipitation Measurement (GPM) mission on www.nasa.gov. GPM Goddard Multimedia Download high resolution videos and animations that were produced by the GPM team. NASA Goddard Space Flight Center The GPM Core Observatory was assembled and tested at NASA's Goddard Space Flight Center in Greenbelt Maryland. Goddard is home to the nation's largest organization of combined scientists, engineers and technologists that build spacecraft, instruments and new technology to study the Earth, the sun, our solar system, and the universe. Named for...