The Tropical Rainfall Measurement Mission (TRMM) Online Visualization and Analysis System (TOVAS), a key component of the NASA Giovanni data analysis system, has integrated a new version of the Global Precipitation Climatology Project (GPCP) data set. Version 2.2. supplants previous GPCP versions, which are now considered obsolete. It is therefore recommended that users replace their current GPCP data with Version 2.2, and obtain the updated documentation. Note that some months in the V2.2 record are considered provisional for the time being.
For details, please refer to the PDF document linked below.
GPCP Version 2.2 Combined Precipitation Data Set Documentation
To visualize the data, or to download the Version 2.2 data files by ftp, go to TOVAS Giovanni.
The images below are example analyses created with TOVAS Giovanni, using the new GPCP Version 2.2 data set.
Figure 1. Hovmõller latitude versus time diagram of the tropical Pacific ocean, showing the seasonal and interannual variability of precipitation between 1979 - 2010. Precipitation in this region strongly influenced by El Niño - Southern Oscillation (ENSO) event; the brighter "stripes" extending to the east indicate an El Niño event. (Click the image to see larger size.)
Figure 2. The 30 years of global precipitation data in GPCP Version 2.2 allow time-series analysis. A well-known phenomenon
is the decreasing precipitation in northeastern China, illustrated above.
Figure 3. In contrast to northeastern China, the southern provinces of China are experiencing increased precipitation, as shown in the time-series of GPCP Version 2.2 data shown above.