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Earth Topics (Applications)
  • Ocean and Coast
  • Ocean Waves

    Ocean Winds

  • Atmosphere
  • Atmospheric Winds

    Instrument type
    Date of Launch:
    19 June 1999
    Mission Status:
    Operations ended in 2009
    Orbit Height:
    803 km
    Orbit type:
    Circular sun-synchronous polar
    Swath Width:
    1800 km
    QuikSCAT/L2B - ECMWF colocation
    (1768) recent views
    Last update: 23 January 2012

    This product provides a dataset colocating backscatter and wind measurements from SeaWinds scatterometer (L2A & L2B products from JPL/PO.DAAC), onboard QuikSCAT, together with the wind fields from the ECMWF (European Centre for Medium-range Weather Forecasting) reanalysis.

    The QE product consists in the colocation of QuikSCAT/SeaWinds Level 2B datasets, together with ECMWF reanalyzed wind fields. Only minimal level is available for this product.

    SeaWinds, the NASA scatterometer onboard QuikSCAT, is a rotating Ku band (13.4 GHz) microwave radar that measures the speed and direction of winds over the global ocean surface. SeaWinds Level 2B product includes wind vector solutions over 25km wind vector cells (WVC) for all four wind vector ambiguities as well as the Direction Interval Retrieval with Threshold Nudging (DIRTH) wind vector solution and rain probability indicators (since raindrops may affect the sigma-0 measurement and thus the wind vector solution).

    The ECMWF Meteorological surface winds provide global wind fields (speed and direction) over a 1.125 degree resolution grid, every 6 hours.

    Each QE file contains data for one full orbital revolution of QuikSCAT. These data are grouped by rows of 25km wind vector cells (WVC). Each row contains a total of 76 WVC values and corresponds to a single cross-track cut of the SeaWinds 1800 km wide swath. Since ECMWF wind fields are provided over global grids, all cells from QuikSCAT products can be colocated (the ECMWF values are spatially and temporaly interpolated to get a value for each WVC). Thus, the colocation files only contains ECMWF parameters and corresponding WVC position indicators (latitude, longitude, and index in L2B product): they have to be used as a complement to L2B product (there is a one-to-one correspondance between data array elements from QE and L2B products).

    Data Set Specifications
    Spatial coverage: 90 N, 90 S, 180 W, 180 E
    Temporal coverage: 1999-07-19 - 2009
    Processing level
    Level 2b
    How to access this data

    Data are available through QuickSCAT website.

    Terms & Conditions applicable
    Utilisation of this data is subject to the Terms and Conditions for ESA's Third Party Missions scheme