QSCAT_LEVEL_2B_OWV_COMP_12_KUSST_LCRES_4.0_1

PODAAC-QSX12-L2B40

Version 1
  • Abstract
    This dataset contains the latest reprocessed version 4.0 of the Level 2B science-quality ocean surface wind vector retrievals from the QuikSCAT scatterometer. The retrievals are provided on a non-uniform grid within the swath at 12.5 km pixel resolution. Higher resolution is achieved through a slice composite technique in which high resolution slice measurements from L1B data are composited into a 12.5 km wind vector cell. Each L2B file corresponds to a specific orbital revolution (rev) number, which begins at the southernmost point of the ascending orbit. This is an official dataset produced by the NASA QuikSCAT Project through the SeaWinds Processing and Analysis Center (SeaPAC). Version 4.0 processing begins with the same L1B (time-ordered backscatter) data as used in the previous Version 3.1 processing. The new version has three important improvements over the previous version 3.1. First, a sea-surface temperature (SST) dependent geophysical model function (GMF) developed by Lucrezia Ricciardulli of Remote Sensing Systems is used in wind retrieval in order to fix persistent speed biases in Ku-band data over cold ocean. Second, near coastal winds are retrieved using the Land Contamination Ratio with Expected Sigma-0 (LCRES) technique which retrieves winds significantly closer to the coast than has been done before. Third, flagging is simplified and extra flags are provided. All of the legacy quality flags are preserved with the same meaning. A new single bit wind_retrieval_likely_corrupted_flag is established for conditions in which approximately 3% (or greater) of the data comprising a wind vector cell (WVC) exhibits suboptimal performance due to rain, ice, or a few other rare anomalous cases. Another bit wind_retrieval_possibly_corrupted_flag is established for conditions in which approximately 15% of the data comprising a WVC near rain, ice, or a coastal boundary is thought to be high quality but may not match up well with numerical wind models due to either remaining rain/ice/land contamination or variability in the winds near ice, rain, and coasts that are not reflected in the numerical weather prediction (NWP) matchups. In addition to these two new bits, copious quality information is provided in the flags and eflags variables to allow users to tailor flags to meet their own needs. New and legacy flag bits are described in more detail in the user guide.

Data Identification Fields:

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    Data Dates
    Creation
    Last Revision
    Processing Level

    2

    Quality
    Collection Progress

    Not Provided

Related URLs
    Science Keywords
    • Earth Science
    • Oceans
    • Ocean Winds
    • Surface Winds
    • Ocean Surface Wind Vectors

Acquisition Information Fields:

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Platforms
  • SPACECRAFT
    QUIKSCAT
    Instruments
    • SEAWINDS

Temporal Information Fields:

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Spatial Information Fields:

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    Coverage Type Zone Identifier Geometry Granule Representation
    HORIZONTAL CARTESIAN CARTESIAN
Location Keywords
    • GEOGRAPHIC REGION
    • GLOBAL

Data Centers

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  • SeaWinds Processing and Analysis Center (SeaPAC)
    PROCESSOR

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  • PO.DAAC
    ARCHIVER

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  • Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, N
    ARCHIVER
    Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA

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  • SeaWinds Processing and Analysis Center (SeaPAC)
    ARCHIVER

    This data center does not have any addresses listed.

Data Contacts

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  • User
    Technical Contact
    User Services

    Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, N

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  • Bryan
    Technical Contact
    Bryan Stiles

    SeaWinds Processing and Analysis Center (SeaPAC)

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Collection Citations Fields:

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