GPM_2ADPRENV_05

GPM DPR L2A Environment 1.5 hours 5 km V05 (GPM_2ADPRENV) at GES DISC

Version 05
  • Abstract
    Version 5 is the current version of the data set. Version 4 is no longer available and has been superseded by Version 5. This is environmental data that includes the profiles of atmospheric parameters assumed in the L2 retrieval algorithm. This GPM data type provides single- and dual-frequency-derived precipitation estimates from the Ku and Ka radars of the Dual-Frequency Precipitation Radar (DPR) on the core GPM spacecraft. The output consists of three main classes of precipitation products derived from the: + the Ku-band frequency over a wide swath (245 km); + the Ka-band frequency over a narrow swath (125 km), and + the dual-frequency data over the narrow swath. The Ka-band results are further divided into the standard and high-sensitivity estimates. In the standard sensitivity mode, the fields of view within the inner swath are matched to those of the Ku-band. Data from these matched-beam Ku- and Ka-band fields of view are used to derive the dual-frequency precipitation products. The retrievals are performed at each radar range bin along the slant path of the radar instrument field of view (IFOV). The dual-frequency retrieval benefits from having co-aligned measurements at Ku- and Ka-bands. Data from these measurements are used to infer properties of the particle size distribution, which are expected to lead to improved estimates of rainfall rate and equivalent liquid water content. Dual-frequency data are expected to improve the capability to discriminate among water, ice, and mixed-phase hydrometeors as a function of height. This capability is particularly important in convective storms where a bright-band signature, associated with mixed-phase hydrometeors, is usually not detectable. In addition, the different attenuation rates of the Ku- and Ka-bands allow differential attenuation techniques to be used to estimate the path integrated attenuation. The high-sensitivity Ka-band channel is expected to have 6 dB greater sensitivity than the Ku- and standard Ka-band channels and to provide enhanced detection capabilities at the light rainfall rates.
  • Version Description
    Not provided

Data Identification Fields:

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    Data Dates
    Creation
    Last Revision
    Processing Level

    2

    Quality
    The presence of changing topography (ex.: mountains) presents challenges to the ability of the algorithm to distinguish between precipitation echo and surface clutter. The Ka frequency undergoes larger extinction through precipitation, and the dual-frequency retrieval may be limited to lower-moderate rain rates. As the DPR will be the first dual-frequency weather radar flown in space, dual-frequency retrieval methods will need extensive testing and validation. 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 Ka-band data in heavy precipitation.
    Collection Progress

    In Work

    Access Constraints

    1.0

    None

    Publication References
    • Publication reference title not provided
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Related URLs
    Science Keywords
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC WATER VAPOR
    • EARTH SCIENCE
    • ATMOSPHERE
    • PRECIPITATION
Other Descriptive Keywords
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Ancillary Keywords
  • Atmosphere, Precipitation, Water Vapor
ISO Topic Categories
  • CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
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Acquisition Information Fields:

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Platforms
  • Earth Observation Satellites
    GPM
    Instruments
    • DPR
Projects
Project Short Name Campaigns Project Dates
GPM No campaigns listed. No dates provided.

Temporal Information Fields:

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Spatial Information Fields:

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Location Keywords
    • GEOGRAPHIC REGION
    • TROPICS

Data Centers

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  • NASA/GSFC/SED/ESD/GCDC/GESDISC
    ARCHIVER
    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

    This data center does not have any addresses listed.

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Data Contacts

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  • GEORGE
    Investigator
    GEORGE HUFFMAN

    NASA Goddard Space Flight Center
    Mailstop 612
    Greenbelt, MD 20771

    • Email
    • 301-614-6308
    • 301-614-5492
  • ANDREY
    Metadata Author
    ANDREY SAVTCHENKO

    Distributed Active Archive Center Global Change Data Center
    Code 610.2
    NASA Goddard Space Flight Center
    Greenbelt, MD 20771

  • Data Center Contact
    GES 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

    • Email
    • 301-614-5224
    • 301-614-5268

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