NSCAT Level 2 Ocean Wind Vector Ambiguity Removal Overlay (Hoffman, AER)(NSCAT_AER_HOFFMAN_L2_OW_WIND_VECTOR_AMBIGUITY_REMOVAL)
|Start/Stop Date||1996-Sep-15 to 1997-Jun-29|
|Description||This 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.|
|Measurement||OCEANS > OCEAN WINDS > SURFACE WINDS|
|Swath Width||1600 km|
Name: Advanced Earth Observing Satellite-I (ADEOS-I)
Orbit Period: 100.92 minutes
Inclination Angle: 98.59 degrees
Name: NASA Scatterometer (NSCAT)
Swath Width: 1600.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.
|Project||NASA Scatterometer (NSCAT)|
|Data Provider||Publisher: NASA/JPL/PO.DAAC|
Release Place: PO.DAAC
Release Date: 1998-Jul-25
|Keyword(s)||ambiguity removal, nscat, adeos, scatterometer, hoffman, aer|
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Spatial Resolution: 25000 Meters x 25000 Meters
Temporal Resolution: 12 Hour
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-29Swath Width: 1600 km
Projection Type: Swath
Projection Detail: Along-track Grid
Ellipsoid: WGS 84
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|DATA CITATION POLICY|
Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.
|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
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.