Climatology Meteorology Atmosphere
TRMM/PR L3 Monthly Surface Rain is obtained from the PR sensor onboard TRMM and produced by the Japan Aerospace Exploration Agency (JAXA). The Precipitation Radar (PR) is the primary instrument onboard TRMM. The most innovative of the five TRMM instruments, the PR is the first quantitative rain radar instrument to be flown in space. The major objectives of the PR instrument are as follows:a. Provides a 3-dimensional rainfall structureb. Achieves quantitative measurements of the rain rates over both land and ocean When properly combined with TMI measurements, the Precipitation Radar (PR) data is instrumental in obtaining the height profile of the precipitation content, from which the profile of latent heat release from the Earth can be estimated. The rain rate is estimated from the radar reflectivity factor when the rain rate is small by applying conventional algorithms used for ground-based radar. For large rain rates, a rain attenuation correction is made using the total-path attenuation of land or sea surface echoes. Monthly rainfall, rain rate averages, rain rate standard deviation and probability distribution function in 5deg x 5deg grid at three layers in the height of 2 km, 4 km and 6 km.The provided format is HDF4. The statistical period is 1 month. The current version of the product is Version 7. The generation unit is global.
TRMM/PR L3 Monthly Surface Rain
The user is entitled to use G-Portal data free of charge without any restrictions (including commercial use) except for the condition about acknowledgement of data credit as stipulated in G-portal terms of use 7.(2).Click [here](https://gportal.jaxa.jp/gpr/index/eula?lang=en) for detailed G-Portal data usage constrains.
EARTH SCIENCE>ATMOSPHERE
EARTH SCIENCE>ATMOSPHERE>PRECIPITATION
TRMM
PR
No constraints but users need to be registered with [the G-portal User Registration system](https://gportal.jaxa.jp/gpr/user/regist1?lang=en) to download files.
EARTH SCIENCE
ATMOSPHERE
PRECIPITATION
Japan Aerospace Exploration Agency (JAXA)
JAPAN
JP/JAXA/SAOC

Climatology Meteorology Atmosphere
TRMM_GPMFormat/PR L3 Precipitaion (1-Day,0.25deg) dataset is the new (GPM-formated) TRMM product. There is no equivalent in the old TRMM suite of products. The closest ancestor was TRMM 3A25 which was a monthly radar statistics.It is obtained from the Precipitation Radar (PR) sensor onboard Tropical Rainfall Measuring Mission (TRMM) Core Satellite and produced by the Japan Aerospace Exploration Agency (JAXA).The most innovative of the five TRMM instruments, the PR is the first quantitative rain radar instrument to be flown in space. The major objectives of the PR instrument are as follows:a. Provides a 3-dimensional rainfall structureb. Achieves quantitative measurements of the rain rates over both land and ocean When properly combined with TMI measurements, the Precipitation Radar (PR) data is instrumental in obtaining the height profile of the precipitation content, from which the profile of latent heat release from the Earth can be estimated. The rain rate is estimated from the radar reflectivity factor when the rain rate is small by applying conventional algorithms used for ground-based radar. For large rain rates, a rain attenuation correction is made using the total-path attenuation of land or sea surface echoes.This dataset calculates various daily statistics from the level 2 PR. Four types of statistics are calculated: Probabilities of occurrence (count values), Means and standard deviationsThe provided format is HDF5. The Sampling resolution is 0.25 degree grid (Daily HDF). The current version of the product is Version 6. The generation unit is global.
TRMM_GPMFormat/PR L3 Precipitaion (1-Day,0.25deg)
The user is entitled to use G-Portal data free of charge without any restrictions (including commercial use) except for the condition about acknowledgement of data credit as stipulated in G-portal terms of use 7.(2).Click [here](https://gportal.jaxa.jp/gpr/index/eula?lang=en) for detailed G-Portal data usage constrains.
EARTH SCIENCE>ATMOSPHERE
EARTH SCIENCE>ATMOSPHERE>PRECIPITATION
TRMM
PR
No constraints but users need to be registered with [the G-portal User Registration system](https://gportal.jaxa.jp/gpr/user/regist1?lang=en) to download files.
EARTH SCIENCE
ATMOSPHERE
PRECIPITATION
Japan Aerospace Exploration Agency (JAXA)
JAPAN
JP/JAXA/SAOC

Climatology Meteorology Atmosphere
TRMM/PR L2 Surface Cross Section is obtained from the PR sensor onboard TRMM and produced by the Japan Aerospace Exploration Agency (JAXA). The Precipitation Radar (PR) is the primary instrument onboard TRMM. The most innovative of the five TRMM instruments, the PR is the first quantitative rain radar instrument to be flown in space. The major objectives of the PR instrument are as follows:a. Provides a 3-dimensional rainfall structureb. Achieves quantitative measurements of the rain rates over both land and ocean When properly combined with TMI measurements, the Precipitation Radar (PR) data is instrumental in obtaining the height profile of the precipitation content, from which the profile of latent heat release from the Earth can be estimated. The rain rate is estimated from the radar reflectivity factor when the rain rate is small by applying conventional algorithms used for ground-based radar. For large rain rates, a rain attenuation correction is made using the total-path attenuation of land or sea surface echoes.Based on the 1B-21 radar received power, time and spatial average of ground surface scattering coefficient (Scattering Radar Cross Section of the surface) are calculated. If it's raining, Path Integrated Attenuation (PIA) is calculated based on the surface reference data of no rain area. This PIA is used to calculate rainfall profile in 2A-25 as reference data using Surface Reference Technique (SRT).The provided format is HDF4. The Sampling resolution are 5 km (horizontal) and 250 m (range). The current version of the product is Version 7. The generation unit is orbit.
TRMM/PR L2 Surface Cross Section
The user is entitled to use G-Portal data free of charge without any restrictions (including commercial use) except for the condition about acknowledgement of data credit as stipulated in G-portal terms of use 7.(2).Click [here](https://gportal.jaxa.jp/gpr/index/eula?lang=en) for detailed G-Portal data usage constrains.
EARTH SCIENCE>SPECTRAL/ENGINEERING>RADAR
TRMM
PR
No constraints but users need to be registered with [the G-portal User Registration system](https://gportal.jaxa.jp/gpr/user/regist1?lang=en) to download files.
EARTH SCIENCE
SPECTRAL/ENGINEERING
RADAR
Japan Aerospace Exploration Agency (JAXA)
JAPAN
JP/JAXA/SAOC

TRMM_GPMFormat/PR/KuPR L2 Precipitation dataset is the new (GPM-formated) TRMM product and replaces the old TRMM_2A21, 2A23 and 2A25 datasets. It is obtained from the Precipitation Radar (PR) sensor onboard Tropical Rainfall Measuring Mission (TRMM) Core Satellite and produced by the Japan Aerospace Exploration Agency (JAXA).The most innovative of the five TRMM instruments, the PR is the first quantitative rain radar instrument to be flown in space. The major objectives of the PR instrument are as follows:a. Provides a 3-dimensional rainfall structureb. Achieves quantitative measurements of the rain rates over both land and ocean When properly combined with TMI measurements, the Precipitation Radar (PR) data is instrumental in obtaining the height profile of the precipitation content, from which the profile of latent heat release from the Earth can be estimated. The rain rate is estimated from the radar reflectivity factor when the rain rate is small by applying conventional algorithms used for ground-based radar. For large rain rates, a rain attenuation correction is made using the total-path attenuation of land or sea surface echoes.TRMM 2A21 dataset computes the path-integrated attenuation (PIA) using the surface reference technique (SRT). TRMM 2A23 dataset detects of bright band (BB) and determines of the height of BB, the strength of BB, and the width (i.e. thickness) of BB when BB exists, and classificates of rain type into the three categories. TRMM 2A25 dataset corrects for the rain attenuation in measured radar reflectivity (Zm) and to estimate the instantaneous three-dimensional distribution of rain from the TRMM Precipitation Radar data.The provided format is HDF5. The Sampling resolution are 5km (horizontal) and 125m (vertical). The current version of the product is Version 6. The generation unit is one orbit.
TRMM_GPMFormat/PR/KuPR L2 Precipitation
EARTH SCIENCE>ATMOSPHERE
EARTH SCIENCE>ATMOSPHERE>PRECIPITATION
ATMOSPHERE
PRECIPITATION

TRMM/PR L1 Received Power is obtained from the PR sensor onboard TRMM and produced by the Japan Aerospace Exploration Agency (JAXA). The Precipitation Radar (PR) is the primary instrument onboard TRMM. The most innovative of the five TRMM instruments, the PR is the first quantitative rain radar instrument to be flown in space. The major objectives of the PR instrument are as follows:a. Provides a 3-dimensional rainfall structureb. Achieves quantitative measurements of the rain rates over both land and ocean When properly combined with TMI measurements, the Precipitation Radar (PR) data is instrumental in obtaining the height profile of the precipitation content, from which the profile of latent heat release from the Earth can be estimated. The rain rate is estimated from the radar reflectivity factor when the rain rate is small by applying conventional algorithms used for ground-based radar. For large rain rates, a rain attenuation correction is made using the total-path attenuation of land or sea surface echoes.In PR Level 1 processing, Level 0 transmitted from NASA data is checked whether it is in an observation mode, and then three types of products are processed which are 1A21, 1B21, and 1C21. Moreover received power, noise level, Z factor including rain attenuation is calculated. However, 1A21 is actually processed within a same routine as 1B21, so 1A21 itself is not singly output. In 1B21 processing, the radar video signal digital count value is converted into a received power value as well as a noise level value in accordance with the algorithm (calibration of received power based on temperature calibration as well as transfer function) created based on the radiometric model of the precipitation radar. Longitude and latitude information of ground surface is added to convert this value into radar reflectivity factor (Z factor) including rain attenuation. Also, rain/no rain is determined for each angle bin, a flag is set up, and the rain height is calculated. Moreover, influence of surface clutter, which is mixed from antenna main lobe and side lobe, is evaluated, and the evaluation result is reflected to the calculation of surface range bin number and the determination of rain/no rain.The provided format is HDF4. The Sampling resolution are 5km (horizontal) and 250m (range). The current version of the product is Version 7. The generation unit is orbit.
TRMM/PR L1 Received Power
EARTH SCIENCE>SPECTRAL/ENGINEERING>RADAR
SPECTRAL/ENGINEERING
RADAR

TRMM_GPMFormat/PR L2 Spectral Latent Heating Profiles dataset is the new (GPM-formated) TRMM product. There is no equivalent in the old TRMM suite of products. It is obtained from the Precipitation Radar (PR) sensor onboard Tropical Rainfall Measuring Mission (TRMM) Core Satellite and produced by the Japan Aerospace Exploration Agency (JAXA).The most innovative of the five TRMM instruments, the PR is the first quantitative rain radar instrument to be flown in space. The major objectives of the PR instrument are as follows:a. Provides a 3-dimensional rainfall structureb. Achieves quantitative measurements of the rain rates over both land and ocean When properly combined with TMI measurements, the Precipitation Radar (PR) data is instrumental in obtaining the height profile of the precipitation content, from which the profile of latent heat release from the Earth can be estimated. The rain rate is estimated from the radar reflectivity factor when the rain rate is small by applying conventional algorithms used for ground-based radar. For large rain rates, a rain attenuation correction is made using the total-path attenuation of land or sea surface echoes.This dataset uses TRMM PR information [precipitation-top height (PTH), precipitation rates at the surface and melting level, and rain type] to select heating profiles from lookup tables. Heating-profile lookup tables for the three rain typesâconvective, shallow stratiform, and anvil rain (deep stratiform with a melting level) were derived from numerical simulations of tropical cloud systems from the Tropical Ocean and Global Atmosphere Coupled Ocean-Atmosphere Response Experiment (TOGA COARE) utilizing a cloud-resolving model (CRM). The provided format is HDF5. The Sampling resolution are 5 km(horizontal) and 250 m (vertical). The current version of the product is Version 6. The generation unit is one orbit.
TRMM_GPMFormat/PR L2 Spectral Latent Heating Profiles
EARTH SCIENCE>ATMOSPHERE>ATMOSPHERIC RADIATION
ATMOSPHERIC RADIATION

TRMM/PR L2 Spectral Latent Heating is obtained from the PR sensor onboard TRMM and produced by the Japan Aerospace Exploration Agency (JAXA). The Precipitation Radar (PR) is the primary instrument onboard TRMM. The most innovative of the five TRMM instruments, the PR is the first quantitative rain radar instrument to be flown in space. The major objectives of the PR instrument are as follows:a. Provides a 3-dimensional rainfall structureb. Achieves quantitative measurements of the rain rates over both land and ocean When properly combined with TMI measurements, the Precipitation Radar (PR) data is instrumental in obtaining the height profile of the precipitation content, from which the profile of latent heat release from the Earth can be estimated. The rain rate is estimated from the radar reflectivity factor when the rain rate is small by applying conventional algorithms used for ground-based radar. For large rain rates, a rain attenuation correction is made using the total-path attenuation of land or sea surface echoes. Latent heating, Q1-QR, and Q2 profiles derived from TRMM/PR 2A25. Note:2H25 product is defined almost as standard product.The provided format is HDF4. The Sampling resolution are 5 km (horizontal) and 125 m / 250 m (range). The current version of the product is Version 7. The generation unit is orbit.
TRMM/PR L2 Spectral Latent Heating
EARTH SCIENCE>ATMOSPHERE>ATMOSPHERIC RADIATION
ATMOSPHERIC RADIATION

TRMM/PR L3 Monthly Spectral Latent Heating is obtained from the PR sensor onboard TRMM and produced by the Japan Aerospace Exploration Agency (JAXA). The Precipitation Radar (PR) is the primary instrument onboard TRMM. The most innovative of the five TRMM instruments, the PR is the first quantitative rain radar instrument to be flown in space. The major objectives of the PR instrument are as follows:a. Provides a 3-dimensional rainfall structureb. Achieves quantitative measurements of the rain rates over both land and ocean When properly combined with TMI measurements, the Precipitation Radar (PR) data is instrumental in obtaining the height profile of the precipitation content, from which the profile of latent heat release from the Earth can be estimated. The rain rate is estimated from the radar reflectivity factor when the rain rate is small by applying conventional algorithms used for ground-based radar. For large rain rates, a rain attenuation correction is made using the total-path attenuation of land or sea surface echoes. Latent heating, Q1-QR, and Q2 profiles derived from TRMM/PR 2H25. The spatial coverage is global with a single grid cell being 0.5deg x 0.5deg.The provided format is HDF4. The statistical period is 1 month. The current version of the product is Version 7. The generation unit is global.
TRMM/PR L3 Monthly Spectral Latent Heating
EARTH SCIENCE>ATMOSPHERE>ATMOSPHERIC RADIATION
ATMOSPHERIC RADIATION

TRMM_GPMFormat/PR KuPR Environment Auxiliary dataset is the new (GPM-formated) TRMM product. It replaces the old GPM DU2. It is obtained from the Precipitation Radar (PR) sensor onboard Tropical Rainfall Measuring Mission (TRMM) Core Satellite and produced by the Japan Aerospace Exploration Agency (JAXA).The most innovative of the five TRMM instruments, the PR is the first quantitative rain radar instrument to be flown in space. The major objectives of the PR instrument are as follows:a. Provides a 3-dimensional rainfall structureb. Achieves quantitative measurements of the rain rates over both land and ocean When properly combined with TMI measurements, the Precipitation Radar (PR) data is instrumental in obtaining the height profile of the precipitation content, from which the profile of latent heat release from the Earth can be estimated. The rain rate is estimated from the radar reflectivity factor when the rain rate is small by applying conventional algorithms used for ground-based radar. For large rain rates, a rain attenuation correction is made using the total-path attenuation of land or sea surface echoes.In the current algorithm formulation, only the analysis data such as analysis data, must be integrated from an external source during combined algorithm processing. Analysis data are required to produce initial estimations of environmental parameters such as total precipitable water, TPWanal, cloud liquid water path, CLWPanal, surface skin temperature, Tsfcanal, and 10m altitude wind speed, U10manal. The current algorithm design requires space-time interpolation of these data from the Japanese Meteorological agency's (JMA) global analysis (GANAL) during standard algorithm processing. The data are interpolated to the DPR footprint/range bin locations and overpass times in the Vertical Profile Submodule (VER) of the Level 2 Radar Algorithm and then output. For near real-time processing, the JMA forecast fields, but if these fields are not received in time for any reason, the climate value data are substituted for the JMA analysis/forecast data in the VER processing.Main parameters: Air temperature, Air pressure, Water vapor, Cloud liquid waterSwath width: 245 kmResolution: 5 km(horizontal), 125m(vertical)The generation unit is orbit. The current version of the product is Version 6.
TRMM_GPMFormat/PR KuPR Environment Auxiliary
EARTH SCIENCE>ATMOSPHERE>ATMOSPHERIC TEMPERATURE
EARTH SCIENCE>ATMOSPHERE>ATMOSPHERIC PRESSURE
EARTH SCIENCE>ATMOSPHERE>CLOUDS
ATMOSPHERIC TEMPERATURE
ATMOSPHERIC PRESSURE
CLOUDS

TRMM/PR L2 Rainfall Profile is obtained from the PR sensor onboard TRMM and produced by the Japan Aerospace Exploration Agency (JAXA). The Precipitation Radar (PR) is the primary instrument onboard TRMM. The most innovative of the five TRMM instruments, the PR is the first quantitative rain radar instrument to be flown in space. The major objectives of the PR instrument are as follows:a. Provides a 3-dimensional rainfall structureb. Achieves quantitative measurements of the rain rates over both land and ocean When properly combined with TMI measurements, the Precipitation Radar (PR) data is instrumental in obtaining the height profile of the precipitation content, from which the profile of latent heat release from the Earth can be estimated. The rain rate is estimated from the radar reflectivity factor when the rain rate is small by applying conventional algorithms used for ground-based radar. For large rain rates, a rain attenuation correction is made using the total-path attenuation of land or sea surface echoes. Vertical profile of rain rate (R) calculated from TRMM/PR 1C21, 2A21 and 2A23.The provided format is HDF4. The Sampling resolution are 5 km (horizontal) and 250 m (range). The current version of the product is Version 7. The generation unit is orbit.
TRMM/PR L2 Rainfall Profile