GPM DPR Ku Precipitation Profile 2A 1.5 hours 5 km V06 (GPM_2AKu) at GES DISC
Version 06 is the current version of the data set. Older versions will no longer be available and have been superseded by Version 06. The 2AKu algorithm is a single-frequency retrieval that relies on Ku-band data only, and provides precipitation estimates from the Ku radar of the Dual-Frequency Precipitation Radar on the core GPM spacecraft. The Ku Level-2A product, 2AKu, ”Ku precipitation,” is written as a 1 swath structure. The swath is NS, normal scans. Since the Ku-band channel of the Dual-Frequency Precipitaiton Radar (DPR) is very similar to the TRMM PR, the principal challenge in the development of the DPR level 2 algorithms is to combine the new Ka-band data with the Ku-band data. It is important to note the difference between the single- and the dual-frequency (DF) algorithms. While this 2AKu dataset is a single-frequency retrieval, the DF algorithm employs both KuPR and KaPR L1B standard products as inputs. The DF algorithm cannot be executed unless both L1B products are available. Pixels observed by DPR can be categorized into three types: pixels in the inner swath of normal scans (observed both by KuPR and KaPR), pixels in the outer swath of normal scans (observed only by KuPR), and pixels in the interleaved scans (observed only by KaPR in the high-sensitivity mode). The KuPR algorithm is executed for pixels in both inner and outer swaths of normal scans. The KaPR algorithm is executed for pixels in the inner swath of normal scans and in the interleaved scans. The DF algorithm is executed for pixels of all the three kinds.
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| Spatial Extent: | Bounding Rectangle: N: 70 S: -70 E: 180 W: -180 |
Data Format(s): | Distribution: HDF5 |
| Temporal Extent: | Platform(s): | GPM | |
| Data Center(s): | NASA/GSFC/SED/ESD/GCDC/GESDISC | Instrument(s): | DPR |
| Version: | 06 | ||
- Title: GPM DPR Ku Precipitation Profile 2A 1.5 hours 5 km V06
- Version: 06
- Creator: Toshio Iguchi, Robert Meneghini
- Publisher: Goddard Earth Sciences Data and Information Services Center (GES DISC)
- Release Date: 2016-03-03T00:00:00.000Z
- Linkage: https://disc.gsfc.nasa.gov/datacollection/GPM_2AKu_06.html
10.5067/GPM/DPR/Ku/2A/06
- READ-ME: https://gpm1.gesdisc.eosdis.nasa.gov/data/GPM_L2/doc/README.GPM.pdf, README Document
- ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD): https://pps.gsfc.nasa.gov/Documents/ATBD_GPM_DPR_n3_dec15.pdf
- GENERAL DOCUMENTATION: ftp://gpmweb2.pps.eosdis.nasa.gov/pub/GPMfilespec/filespec.GPM.pdf, FILE SPECIFICATION DOCUMENT
- ANOMALIES: ftp://gpmweb2.pps.eosdis.nasa.gov/tsdis/AB/docs/gpm_anomalous.html, GPM and partner sensors anomalous events
- GENERAL DOCUMENTATION: https://pps.gsfc.nasa.gov/gpminstruments.html, Instrument Description
Collection Information
Data Identification
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Processing Level
2
- Quality Major sources of error that have an impact on estimates of surface precipitation include clutter contamination of near-surface echoes, incorrect identification of precipitation type (convective/stratiform), and severe attenuation of the Ku-band data in heavy precipitation. The Ku-only retrieval has limitations of a single-frequency retrieval with reduced ability to detect water phase changes with height. This is partially mitigated by the use of external atmospheric state data from observations and models. The presence of changing topography (ex.: mountains) presents challenges to the ability of the algorithm to distinguish between precipitation echo and surface clutter. The Ku frequency undergoes larger extinction through precipitation, and the dual-frequency retrieval may be limited to lower-moderate rain rates.
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Collection Progress
Active
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Use Constraints
The Earth Observing System Data and Information System (EOSDIS) data use policy for NASA data can be accessed at https://earthdata.nasa.gov/earth-observation-data/data-use-policy. For information on how to properly cite and acknowledge data from the NASA GES DISC, refer to https://disc.gsfc.nasa.gov/information/documents?title=data-policy.
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Access Constraints
None
Data Dates
| Creation | |
| Last Revision |
Related URLs
Other Descriptive Keywords
Ancillary Keywords
- Atmosphere, Precipitation, Water Vapor
ISO Topic Categories
- CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
Acquisition Information
Projects
| Project Short Name | Campaigns | Project Dates |
|---|---|---|
| GPM | No campaigns listed. | No dates provided. |
Temporal Information
Spatial Information
| Coverage Type | Zone Identifier | Geometry | Granule Representation |
|---|---|---|---|
| HORIZONTAL | GEODETIC | GEODETIC |
Location Keywords
- GEOGRAPHIC REGION
- TROPICS
Data Centers
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NASA/GSFC/SED/ESD/GCDC/GESDISC
ARCHIVERGoddard 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
This data center does not have any addresses listed.
This data center does not have any contact mechanisms listed.
Data Contacts
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GEORGE HUFFMAN
InvestigatorGEORGE HUFFMAN
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NASA Goddard Space Flight Center
Mailstop 612
Greenbelt, MD 20771
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ANDREY SAVTCHENKO
Metadata AuthorANDREY SAVTCHENKO
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Distributed Active Archive Center Global Change Data Center
Code 610.2
NASA Goddard Space Flight Center
Greenbelt, MD 20771
301-614-5705
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GES DISC HELP DESK SUPPORT GROUP
Data Center ContactGES DISC HELP DESK SUPPORT GROUP
NASA/GSFC/SED/ESD/GCDC/GESDISC-
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
Greenbelt, MD 20771
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Archive And Distribution Information
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Format: HDF5
Format Type: Native
Media: Online Archive
Fees: None
File Distribution Information
There is no direct distribution information for this collection.