GPM_2AKaENV_05

GPM DPR Ka Environment L2A 1.5 hours 5 km V05 (GPM_2AKaENV) 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 Version 4 is no longer available and has been superseded by Version 5.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. The 2AKa algorithm provides precipitation estimates from the Ka radar of the Dual-Frequency Precipitation Radar on the core GPM spacecraft. The product contains two swaths of data corresponding to the scans of the Ka radar. The first swath contains matched scans (MS), which are intended to be co-aligned with the Ku-band instantaneous fields of view (IFOV). The second swath contains the high-sensitivity scans (HS), which are interleaved between the Ku/Ka-MS swaths. Both swaths are narrow and centered within the interior of the Ku swath. This is a single-frequency retrieval of precipitation; no information from the Ku radar is used. The retrievals are performed at each radar range bin along the slant path of the radar IFOV for each swath. This is a single-frequency retrieval that relies on Ka-band data only. While the 2ADPR dual-frequency retrieval should give better overall estimates, that algorithm requires co-aligned Ku-band data. This 2AKa product will be produced independently and would not be impacted by any operational issues with the Ku-band radar. The high sensitivity to smaller hydrometeors should result in precipitation estimates in lighter precipitation than the Ku-only data.

Data Identification Fields:

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    Data Dates
    Creation
    Last Revision
    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 Ka-band data in heavy precipitation. The Ka-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 Ka frequency undergoes larger extinction through precipitation, and the dual-frequency retrieval may be limited to lower-moderate rain rates.
    Collection Progress

    In Work

    Access Constraints

    1.0

    None

    Publication References
    • Publication reference title not provided
        Not provided
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
Additional Attributes
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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.

    This data center does not have any contact mechanisms listed.

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

  • GES DISC HELP DESK SUPPORT GROUP
    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

Collection Citations Fields:

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