[Location: Location_Category='GEOGRAPHIC REGION', Location_Type='GLOBAL']
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Daily TRMM and Others Rainfall Estimate (3B42 V7 derived) Entry ID: GES_DISC_TRMM_3B42_daily_V7 |
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Summary
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Abstract:
The Tropical Rainfall Measuring Mission (TRMM) is a joint U.S.-Japan satellite mission to monitor tropical and subtropical precipitation and to estimate its associated latent heating. TRMM was successfully launched on November 27, at 4:27 PM (EST) from the Tanegashima Space Center in Japan. The rainfall measuring instruments on the TRMM satellite include the Precipitation Radar (PR), an electronically scanning radar operating at 13.8 GHz; TRMM Microwave Image (TMI), a nine-channel passive microwave radiometer; and Visible and Infrared Scanner (VIRS), a five-channel visible/infrared radiometer. The purpose of the 3B42 algorithm is to produce TRMM-adjusted merged-infrared (IR) precipitation rate (in mm/hr) and root-mean-square (RMS) precipitation-error estimates. The algorithm combines multiple independent precipitation estimates from the TMI, Advanced Microwave Scanning Radiometer for Earth Observing Systems (AMSR-E), Special Sensor Microwave Imager (SSMI), Special Sensor Microwave Imager/Sounder (SSMIS), Advanced Microwave Sounding Unit (AMSU), Microwave Humidity Sounder (MHS), and microwave-adjusted merged geo-infrared (IR). All input microwave data are intercalibrated to TRMM Combined Instrument (TCI) precipitation estimates (TRMM product 3B31); the iIR estimates are computed using monthly matched microwave-IR histogram matching; then missing data in individual 3-hourly merged-microwave fields are filled with the IR estimates. After the preprocessing is complete, the 3-hourly multi-satellite fields are summed for the month and combined with the monthly accumulated Global Precipitation Climatology Centre (GPCC) rain gauge analysis using inverse-error-variance weighting to form a monthly best-estimate precipitation rate, which is TRMM Product 3B43. The final step is to scale all the 3-hourly estimates for the month to sum to the monthly value (for each gridbox separately). The final 3B42 precipitation (in mm/hr) estimates have a 3-hourly temporal resolution and a 0.25-degree by 0.25-degree spatial resolution. Spatial coverage extends from 50 degrees south to 50 degrees north latitude. Important Changes: After the initial Version 7 processing, it was discovered that AMSU data were neglected in the first retrospective processing of both the Version 7 TMPA (3B42/43) and TMPA-RT (3B40/41/42RT) data series, which created an important shortcoming in the inventory of microwave precipitation estimates used during 2000-2010. In addition, a coding error in the TMPA-RT replaced the occasional missings in product 3B42RT with zeros. Accordingly, both product series were retrospectively processed again. The main impact in both series was to improve the fine-scale patterns of precipitation during 2000-2010 (and for 3B4xRT into late 2012). Averages over progressively larger time/space scales should be progressively less affected. [This is the reason the lack of AMSU went undiscovered; the merger system copes very reasonably with missing data.] Nonetheless, users are urged to switch to the newest Version 7 data sets. The newest runs may be identified by the file names: V.7 3B42/43 suffix of "7A.HDF" for January 2000 - September 2010 V.7 3B4xRT suffix of "7R2.bin" for 1 March 2000 - 6 November 2012 It continues to be the case that the Version 7 3B42/43 is some 4% higher than the calibrating data set (2B31) over oceans, which is still under study. However, the initial conclusion is that it results from the sampling mismatch between the (very sparse) TCI and the (much denser) microwave constellation. At the large scales this offset seems to be nearly a proportional constant. The daily accumulated (beginning at 00Z and ending at 21Z; unit: mm) rainfall product is derived from this 3-hourly product. The data are stored in flat binary. The file size is about 2.25 MB (uncompressed). TRMM Product FAQ: http://disc.sci.gsfc.nasa.gov/additional/faq/precipitation_faq.shtml Sign up to receive announcements on the latest data information, tools and services that become available, data announcements from PPS and more! Contact the GES DISC User Services (gsfc-help-disc@lists.nasa.gov) to be added to the list. |
Related URL
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Link:
GET DATA
Description: Access to TRMM and Other-GPI Calibration Rainfall Product (3B42) Link: GET DATA > MIRADOR Description: The Mirador Earth Science Data Search Tool includes TRMM 3B42, TRMM-adjusted merged-infrared (IR) precipitation and root-mean-square (RMS) precipitation-error estimates. Mirador features include location and event gazetteers. Link: GET DATA > ECHO Description: Refine your granule search with ECHO's next generation Earth Science discovery tool (Reverb) using information from this record. Link: GET RELATED SERVICE METADATA (SERF) Description: This interface is designed for quick analyses of the TRMM Level-3 daily rainfall product, 3B42. Users can plot area averages (area plot) and time series (time plot) for selected areas and time periods. Link: GET RELATED SERVICE METADATA (SERF) Description: This tool is online inter-comparison of monthly TRMM and other global gridded precipitation products. Link: VIEW RELATED INFORMATION Description: Readme document for TRMM and Other-GPI Calibration Rainfall Product (3B42) Link: VIEW RELATED INFORMATION Description: Information and data access for all of the Goddard DAAC's hydrology data holdings, including TRMM data from the TMI, Precipitation Radar (PR) and Visible and Infrared Scanner (VIRS) instruments, the Ground Validation (GV) radar data, and ancillary and correlative data products. |
Geographic Coverage
| N: 50.0 | S: -50.0 | E: 180.0 | W: -180.0 |
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Data Set Citation
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Dataset Originator/Creator:
Tropical Rainfall Measurement Mission Project (TRMM)
Dataset Title: Daily TRMM and Others Rainfall Estimate (3B42 V7 derived) Version: 7 Online Resource: http://disc.sci.gsfc.nasa.gov/precipitation/documentation/TRMM_READ... |
Temporal Coverage
| Start Date: 1997-12-31 |
Location Keywords
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GEOGRAPHIC REGION
> GLOBAL
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Data Resolution
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Latitude Resolution:
0.25 degree
Longitude Resolution: 0.25 degree Vertical Resolution: Surface Temporal Resolution: Daily |
Science Keywords
| ATMOSPHERE >PRECIPITATION >PRECIPITATION RATE [Definition] |
ISO Topic Category
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CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
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Platform
| TRMM >Tropical Rainfall Measuring Mission [Information] |
Instrument
| PR >TRMM Precipitation Radar [Information] |
| TMI >TRMM Microwave Imager [Information] |
| VIRS >TRMM Visible Infrared Scanner [Information] |
Project
| EOS >Earth Observing System [Information] |
| EOSDIS >Earth Observing System Data Information System [Information] |
| GPCP >Global Precipitation Climatology Project [Information] |
| ESIP >Earth Science Information Partners Program [Information] |
| TRMM >Tropical Rainfall Measuring Mission Project [Information] |
| CWIC >CEOS WGISS Integrated Catalog [Information] |
Quality
| Adjusted GPI relative error estimates are provided for each 0.25 x 0.25 degree box. There are currently no known deficiencies in the 3B42 algorithm. The quality of the 3B42 product is highly sensitive to the quality of the input data: TRMM VIRS (product 1B01), TMI (product 2A12), and TRMM Combined Instrument (TCI) (product 3B31). If the quality of the input data is less than anticipated, then the quality of 3B42 will also be less. |
Access Constraints
| None |
Keywords
| EOSDIS |
Data Set Progress
| IN WORK |
Originating Center
| NASA GSFC GES DISC |
Data Center
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Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA
[Information]
Data Center URL: http://disc.gsfc.nasa.gov/
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Distribution
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Distribution_Media:
FTP
Distribution_Size: file size: 2250 kb Distribution_Format: HDF Fees: none |
Personnel
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GEORGE
HUFFMAN Role: INVESTIGATOR Phone: 301-614-6308 Fax: 301-614-5492 Email: George.J.Huffman at nasa.gov Contact Address: NASA Goddard Space Flight Center Mailstop 612 City: Greenbelt Province or State: Maryland Postal Code: 20771 Country: USA |
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HYDROLOGY DATA SUPPORT TEAM Role: TECHNICAL CONTACT Phone: (301) 614-5165 Fax: (301) 614-5268 Email: gsfc-help-disc at lists.nasa.gov Contact Address: Hydrology Data Support Team, Code 610.2 Goddard Space Flight Center City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA |
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HYDROLOGY DATA SUPPORT TEAM Role: DIF AUTHOR Phone: (301) 614-5165 Fax: (301) 614-5268 Email: gsfc-help-disc at lists.nasa.gov Contact Address: Hydrology Data Support Team, Code 610.2 Goddard Space Flight Center City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA |
Publications/References
Product Readme: ftp://meso-a.gsfc.nasa.gov/pub/trmmdocs/3B42_3B43_doc.pdf
File Specifications for TRMM Products: ftp://pps.gsfc.nasa.gov/pub/v7filespec/filespec.TRMM.V7.pdf
Metadata for TRMM Products: ftp://pps.gsfc.nasa.gov/pub/v7filespec/filespecMeta.TRMM.V7.pdf
TRMM V6 vs. V7 Major Data Format Changes: http://pps.gsfc.nasa.gov/Documents/formatChangesV7.pdf
Huffman, G.J., 1997: "Estimates of Root-Mean-Square Random Error for Finite Samples of Estimated Precipitation," J. Appl. Meteor., 1191-1201.
Huffman, G.J., R.F. Adler, P. Arkin, A. Chang, R. Ferraro, A. Gruber, J. Janowiak, A. McNab, B. Rudolph, and U. Schneider, 1997: "The Global Precipitation Climatology Project (GPCP) Combined Precipitation Dataset," Bul. Amer. Meteor. Soc., 78, 5-20.
Huffman, G.J., R.F. Adler, B. Rudolph, U. Schneider, and P. Keehn, 1995: "Global Precipitation Estimates Based on a Technique for Combining Satellite-Based Estimates, Rain Gauge Analysis, and NWP Model Precipitation Information," J. Clim., 8, 1284-1295.
File Specifications for TRMM Products: ftp://pps.gsfc.nasa.gov/pub/v7filespec/filespec.TRMM.V7.pdf
Metadata for TRMM Products: ftp://pps.gsfc.nasa.gov/pub/v7filespec/filespecMeta.TRMM.V7.pdf
TRMM V6 vs. V7 Major Data Format Changes: http://pps.gsfc.nasa.gov/Documents/formatChangesV7.pdf
Huffman, G.J., 1997: "Estimates of Root-Mean-Square Random Error for Finite Samples of Estimated Precipitation," J. Appl. Meteor., 1191-1201.
Huffman, G.J., R.F. Adler, P. Arkin, A. Chang, R. Ferraro, A. Gruber, J. Janowiak, A. McNab, B. Rudolph, and U. Schneider, 1997: "The Global Precipitation Climatology Project (GPCP) Combined Precipitation Dataset," Bul. Amer. Meteor. Soc., 78, 5-20.
Huffman, G.J., R.F. Adler, B. Rudolph, U. Schneider, and P. Keehn, 1995: "Global Precipitation Estimates Based on a Technique for Combining Satellite-Based Estimates, Rain Gauge Analysis, and NWP Model Precipitation Information," J. Clim., 8, 1284-1295.
Creation and Review Dates
DIF Creation Date:
2011-07-19
Last DIF Revision Date:
2013-05-14
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