QSCAT_L1C_NONSPINNING_SIGMA0_WINDS_V1_1

PODAAC-QSNON-L1CA1

Version 1
  • Abstract
    This dataset contains geo-located and averaged Level 1B Sigma-0 measurements and wind retrievals from the SeaWinds on QuikSCAT platform, initiated in the months following the failure of the rotating antenna motor on 22 November 2009, using the various incidence angles at which QuikSCAT was pointed during the time period from November 2009 until present. Incidence angles were varied in order to cross-calibrate the Oceansat-2 and RapidScat scatterometers and to extend the known Ku-band geophysical model function. The averaging of the L1B input data combined with the wind vector processing results are both contained in this product referred to hereafter as Level 1C (L1C). The fixed and repointed beam processing is relative to either the one corresponding to the vertically polarized "outer" beam or the other corresponding to the horizontally polarized "inner" beam. The Sigma-0 values from the fixed operating beam for each frame are averaged to a single value representing approximately 50 samples. The data points are land flagged, collocated with ECMWF surface winds, and have climatological nadir attenuations provided for the location and time of the data (not applied to the sigma0). Furthermore, the RapidSCAT geophysical model function (GMF) has been used to compute wind speed and direction, which is provided at each discrete sampling point corresponding to the averaged Sigma-0 locations. The wind speed were computed from QuikSCAT Sigma0 values by assuming the ECMWF wind direction as a first step and then refining those directions slightly to minimize differences between ECMWF and QuikSCAT wind vectors. Retrieved wind directions, thus obtained, were reported but are only slightly different from ECMWF values and should not be considered an independent measurement of wind direction. Retrieved wind speeds do not depend significantly on ECMWF speeds as evidenced by the fact that they agree closely with WindSAT polarimetric radiometer speeds whenever WindSAT and ECMWF disagree. The Sigma0 values have also been corrected for scan loss (actually lack thereof, since the antenna does not scan), and for X-factor changes due to repointing.

Data Identification Fields:

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    Data Dates
    Creation
    Last Revision
    Processing Level

    1C

    Quality
    Collection Progress

    Not Provided

Related URLs
    Science Keywords
    • Earth Science
    • Oceans
    • Ocean Winds
    • Surface Winds
    • Ocean Surface Wind Vectors
    • Earth Science
    • Spectral/Engineering
    • Radar
    • Sigma Naught
    • None

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

    This data center does not have any addresses listed.

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  • PO.DAAC
    ARCHIVER

    This data center does not have any addresses listed.

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  • SeaWinds Processing and Analysis Center (SeaPAC)
    ARCHIVER

    This data center does not have any addresses listed.

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

    This data center does not have any addresses listed.

Data Contacts

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  • Bryan
    Technical Contact
    Bryan Stiles

    SeaWinds Processing and Analysis Center (SeaPAC)

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  • David
    Technical Contact
    David Moroni

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

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Collection Citations Fields:

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