The NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) announces the release of the Version 7 Tropical Rainfall Measuring Mission (TRMM) Multi-satellite Precipitation Analysis (TMPA) products with near-global (50° S - 50° N) coverage. This data release consists of three products at different temporal resolutions: 3-hourly (3B42), daily (3B42 derived), and monthly (3B43). The spatial resolution for all three products is 0.25° x 0.25°. The data products are available for the period January 1998 to present.
According to algorithm developer Dr. George Huffman, several important changes are present in the Version 7 TMPA data products, including the following:
► Additional output fields, including sensor-specific source and overpass times.
► Additional satellite data, including the early part of the Microwave Humidity Sounder (MHS) record, the entire operational Special Sensor Microwave Imager (SSM/I) record, and slots for data from future satellites. MHS is an instrument on the European MetOP satellite.
► Uniformly reprocessed input data using current algorithms, most notably data from the Advanced Microwave Sounding Unit (AMSU) and MHS, but also including data from the following sources: TRMM Combined Instrument (TCI), TRMM Microwave Imager (TMI), Advanced Microwave Scanning Radiometer for EOS (AMSR-E), and SSM/I.
► A new infrared (IR) brightness temperature data set for the period before the start of the Climate Prediction Center (CPC) 4-km Merged Global IR data set (i.e., January 1998 – February 2000). Unlike the earlier Global Precipitation Climatology Program (GPCP) histograms used in Version 6, the National Climatic Data Center (NCDC) GridSat-B1 features spatial resolution finer than the TMPA 0.25° resolution and full coverage of the TMPA domain.
► Use of a single, uniformly processed surface precipitation gauge analysis, using current algorithms as computed by the Global Precipitation Climatology Centre (GPCC).
► Use of a latitude-band calibration scheme for all satellites (see “HQ” in the following document).
The new data products can be downloaded from:
- Convert to NetCDF
- Subset Spatially and/or by Parameter as NetCDF
- Download via HTTP
- Simple Subset Wizard (SSW, http://disc.sci.gsfc.nasa.gov/SSW/)
For visualization and analysis with Giovanni TOVAS:
Intercomparison of instances between Version 6 and Version 7 and other precipitation products:
Examples of Version 7 TMPA visualizations:
Figure 1. The 0.25° x 0.25° TMPA monthly product, 3B43, provides information about global precipitation distribution (panel c) with regional details (panel a) and time-series (panel b). Click the figure to view it full-size.
Figure 2. The 3-hourly TMPA product, 3B42, can be used for research into individual weather events. This example shows visualizations of an unusual precipitation event for Pakistan. a) Map of the heavy rain event which led to record-breaking floods in Pakistan in July 2010. b) Time-series showing the peak intensity of rainfall (red circle) during this event. c) and d) Hovmöller diagrams showing the propagation of this rain event . c) is a latitude vs. time diagram, and d) is a longitude vs. time diagram. For additional details, please check our special news report,
Author: Zhong Liu. Editing and Web formatting by James Acker.
The GES DISC is a NASA earth science data center, part of the NASA Earth Science Data and Information System (ESDIS) Project.