NSCAT Level 2 Ocean Wind Vector Ambiguity Removal Overlay (Hoffman, AER)
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DOI10.5067/NSAER-L2AR0
Short NameNSCAT_AER_HOFFMAN_L2_OW_WIND_VECTOR_AMBIGUITY_REMOVAL
DescriptionThis dataset contains the NASA Scatterometer (NSCAT) Level 2 ocean wind vector ambiguity overlay files for the NSCAT MGDR version 2 dataset, referenced for 25 km wind vector cells (WVC). The dataset is derived from the results of a study which used a 2-D variational analysis method (VAM) to select a wind solution from the NSCAT ambiguous winds (Hoffman et al. 2003). Hoffman et al. chose the ambiguity closest in direction to the VAM surface wind analysis. No ambiguity was chosen for poor quality wind vector cells (WVCs). ECMWF analyses were used as the background field for the VAM. Their choice of ambiguity selection is compared with that of JPL, which used a median filter initialized with NCEP analysis fields. Ambiguity selection is changed in ~5% of the dataset, often improving the depiction of meteorological features where the surface wind is strongly curved or sheared. See Hoffman et al. (2003) for more on the method and results. Additional work by Henderson et al. (2003) compares the results of median filtering (JPL) vs. the 2d-VAR method (Hoffman et al., 2003) using 51 days of NSCAT data, supplemented by the NCEP 1000 hPa wind analyses as background fields.
Version2
Dataset TypeCOMPLETE
MeasurementOCEANS > OCEAN WINDS > SURFACE WINDS
Processing Level2
CoverageRegion: GLOBAL
North Bounding Coordinate: 90 degrees
South Bounding Coordinate: -90 degrees
West Bounding Coordinate: -180 degrees
East Bounding Coordinate: 180 degrees
Time Span: 1996-Sep-15 to 1997-Jun-29
ResolutionSpatial Resolution: 25 km (Along) x 25 km (Across)
ProjectionProjection Type: Swath
Projection Detail: Along-track Grid
Ellipsoid: WGS 84
Swath Width1600 km
Platform/Sensor
ADEOS-I
Platform
Name: Advanced Earth Observing Satellite-I (ADEOS-I)
Orbit Period: 100.92 minutes
Inclination Angle: 98.59 degrees
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NSCAT
SENSOR
Name: NASA Scatterometer (NSCAT)
Swath Width: 1600.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

ProjectNASA Scatterometer (NSCAT)
Data ProviderPublisher: NASA/JPL/PO.DAAC
Creator: NASA/JPL/PO.DAAC
Release Place: PO.DAAC
Release Date: 1998-Jul-25

Keyword(s)ambiguity removal, nscat, adeos, scatterometer, hoffman, aer
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Direct Access
PO.DAAC DRIVEhttps://podaac-tools.jpl.nasa.gov/drive/files/allData/nscat/preview/L2/v2/hoffman_arp
PO.DAAC Drive
Format (Compression)ASCII
DATA CITATION POLICY
Citation NASA/JPL/PO.DAAC. 1998. NSCAT Level 2 Ocean Wind Vector Ambiguity Removal Overlay (Hoffman, AER). Ver. 2. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/NSAER-L2AR0

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For more information see Data Citations and Acknowledgments.

Journal Reference Hoffman, R. N., S. M. Leidner, J. M. Henderson, R. Atlas, J. V. Ardizzone, and S. C. Bloom, 2003: A two-dimensional variational analysis method for NSCAT ambiguity removal: methodology, sensitivity, and tuning. J. Atmos. Oceanic Technol., 20, 585-605.

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