Description
This is the new (GPM-formated) TRMM product. It replaces the old TRMM_1B21,1C21
Version 07 is the current version of the data set. Previous versions have been superseded by Version 07.
The TRMM Precipitation Radar (PR), the first of its kind in space, is an electronically scanning radar, operating at 13.8 GHz that measures the 3-D rainfall distribution over both land and ocean, and defines the layer depth of the precipitation.
The 1B21 calculates the received power at the PR receiver input point from the Level-0 count value which is linearly proportional to the logarithm of the PR receiver output power. To convert the count value to the input power, extensive internal calibrations are applied, which are mainly based upon the system model, temperature dependence of model parameters and many temperature sensors attached at various locations of the PR. Periodically the input-output characteristics are measured using an internal calibration loop for the IF unit and later receiver stages. To make an absolute calibration, an Active Radar Calibrator (ARC) is placed at Kansai Branch of CRL and overall system gain of the PR is being measured every 2 months. Using the transfer function based on the above internal and external calibrations, the PR received power is obtained. Note that the value assumes that the signal follows the Rayleigh fading, so if the fading characteristics of a scatter is different, a small bias error may occur (within 1 or 2 dB).
Changes in horizontal resolution resulting from the TRMM boost that occurred on 24 August 2001:
Pre-Boost (before 7 August 2001): Temporal Resolution: 91.5 min/orbit ~ 16 orbits/day; Swath Width: 215 km; Horizontal Resolution: 4.3 km
Post-Boost (after 24 August 2001): Temporal Resolution: 92.5 min/orbit ~ 16 orbits/day; Swath Width: 247 km; Horizontal Resolution: 5.0 km
Resources
| Name | Format | Description | Link |
|---|---|---|---|
| Download this dataset through a directory map | HTML | Access the data via HTTPS | Open resource |
| Use OPeNDAP to access the dataset's data | HTML | Access the data via the OPeNDAP protocol. | Open resource |
| This dataset's landing page | HTML | Access the dataset landing page from the GES DISC website. | Open resource |
| Get a related visualization | PNG | GPM_1BPR.png | Open resource |
| View this dataset's read me document | README Document | Open resource | |
| The dataset's project home page | HTML | TRMM Project Home Page | Open resource |
| View documentation related to this dataset | FILE SPECIFICATION DOCUMENT | Open resource | |
| View documentation related to this dataset | HTML | TRMM Data Gaps | Open resource |
| View documentation related to this dataset | Comparison between TRMM versions 6 and 7. | Open resource | |
| Google Scholar search results | HTML | Search results for publications that cite this dataset by its DOI. | Open resource |
| Download this dataset through Earthdata Search | HTML | Use the Earthdata Search to find and retrieve data sets across multiple data centers. | Open resource |
| View documentation related to this dataset | TRMM Precipitation Radar Instruction Manual (provided by JAXA) | Open resource |