QuikSCAT Level 2B Ocean Wind Vectors in 12.5km Slice Composites Version 4.1
(QSCAT_LEVEL_2B_OWV_COMP_12_KUSST_LCRES_4.1)
3 Publications Cited this Dataset
Citation metrics available for years (2014-2022)
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Publications citing QuikSCAT Level 2B Ocean Wind Vectors in 12.5km Slice Composites Version 4.1
Citation metrics available for years (2014-2022)
| Year | Citation |
|---|---|
| 2022 | Evaluation of Nearshore QuikSCAT 4.1 and ERA-5 Wind Stress and Wind Stress Curl Fields over Eastern Boundary Currents, Remote Sensing ,10.3390/rs14092251 |
| 2022 | Role of Sea Surface Physical Processes in Mixed‐Layer Temperature Changes During Summer Marine Heat Waves in the Chile‐Peru Current System, Journal of Geophysical Research: Oceans ,10.1029/2021JC018338 |
| 2022 | QuikSCAT climatological data record: Land contamination flagging and correction, Remote Sensing ,10.3390/ rs14102487 |
| Version | 4.1 |
| Processing Level | 2 |
| Start/Stop Date | 1999-Oct-27 to 2009-Nov-22 |
| Short Name | QSCAT_LEVEL_2B_OWV_COMP_12_KUSST_LCRES_4.1 |
| Description | This dataset contains the latest reprocessed version 4.1 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 4.1 processing begins with the same L1B (time-ordered backscatter) data as used in the previous Version 4.0 processing. This new version has a number of key improvements and changes over the previous version 4.0, including: 1) winds are now retrieved to within 5-km and 10-km of the coast within oceans/seas and lakes respectively; 2) coastal winds are now flagged as poor coastal quality and likely corrupted in orbits with estimated spacecraft pitch error greater than 0.04 degrees, which affects 150 orbits of data where coastal winds are severely contaminated by land due to poor attitude knowledge (note: attitude error tracking can identify pitch error but not yaw error, so when estimated pitch error is far from zero, it implies yaw error is large and uncorrected); 3) coastal winds are flagged based upon the long term mean wind speed and standard deviation of wind speed for each place on the ground; 4) four quantities, means and standard deviations computed with and without the land contamination correction algorithm applied (note: higher mean and smaller standard deviation are evidence of land contamination), are used to estimate the expected wind speed bias with respect to neighboring wind vector cells over open water; 5) wind vector cells with estimated speed bias greater than 0.4 m/s are flagged as poor coastal quality and likely corrupted; 6) winds within 5-km of the coast of an ocean/sea and 10-km of the coast of a lake are flagged as poor coastal quality and likely corrupted; the larger distance threshold for lakes is due to higher variability in lake water levels. |
| DOI | 10.5067/QSX12-L2B41 |
| Measurement | OCEANS > OCEAN WINDS > SURFACE WINDS OCEANS > OCEAN WINDS > SURFACE WINDS |
| Swath Width | 1800 km |
| Platform/Sensor | QUIKSCAT / Platform Name: QUIKSCAT (QUIKSCAT) Orbit Period: 100.93 minutes Inclination Angle: 98.6 degrees SEAWINDS SENSOR Name: SeaWinds Scatterometer (SEAWINDS) Swath Width: 1800.0 kilometers Description: Spacecraft angular distance from orbital plane relative to the Equator. |
| Project | Quick Scatterometer (QUIKSCAT) |
| Data Provider | Publisher: PO.DAAC Creator: SeaPAC Release Place: PO.DAAC Release Date: 2020-Sep-04 Resource: https://podaac.jpl.nasa.gov/QuikSCAT |
| Format | netCDF-4 |
| Keyword(s) | wind data, wind, ocean wind, wind speed, vector, vectors, ocean wind vector, ocean wind vectors, seawinds, quikscat, scatterometer, l2b, level 2, level 2b, version 4.1, v4.1 |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Spatial Resolution: 12500 Meters x 12500 Meters Temporal Resolution: Hourly - < Daily Coverage Region: GLOBAL OCEAN North Bounding Coordinate: 90 degrees South Bounding Coordinate: -90 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 1999-Oct-27 to 2009-Nov-22 Granule Time Span: 1999-Oct-27 to 2009-Nov-22Swath Width: 1800 km Projection Projection Type: Satellite Native Swath Projection Detail: Geolocation information included for each pixel Ellipsoid: WGS 84 |
| DIRECT ACCESS | |
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| Available for access in-region with AWS Cloud | |
Region | |
| us-west-2 | |
| podaac-ops-cumulus-protected/QSCAT_LEVEL_2B_OWV_COMP_12_KUSST_LCRES_4.1/ | |
| podaac-ops-cumulus-public/QSCAT_LEVEL_2B_OWV_COMP_12_KUSST_LCRES_4.1/ | |
AWS S3 Credentials | |
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| Name | Long Name | Unit |
|---|---|---|
| ambiguity_direction | wind direction ambiguity | degrees |
| ambiguity_obj | wind objective function values | 1 |
| ambiguity_speed | wind speed ambiguity | m s-1 |
| atmospheric_speed_bias | atmospheric speed bias | m s-1 |
| cross_track_wind_speed_bias | relative wind speed bias with respect to sweet spot | m s-1 |
| distance_from_coast | Distance from nearest coastline | km |
| eflags | extended wind vector cell quality flags | bit |
| exp_bias_wrt_oceanward_neighbors | expected bias with respect to oceanward neighboring cells | m s-1 |
| flags | wind vector cell quality flags | bit |
| gmf_sst | Sea Surface Temperature Used in Geophysical Model Function | Degrees Celsius |
| lat | latitude | degrees_north |
| lon | longitude | degrees_east |
| nudge_wind_direction | model wind direction | degrees |
| nudge_wind_speed | model wind speed | m s-1 |
| num_ambiguities | number of ambiguous wind directions found in point-wise wind retrieval prior to spatial filtering | 1 |
| number_in_aft | number of inner aft looks in wind vector cell | 1 |
| number_in_fore | number of inner forward looks in wind vector cell | 1 |
| number_out_aft | number of outer aft looks in wind vector cell | 1 |
| number_out_fore | number of outer forward looks in wind vector cell | 1 |
| rain_impact | impact of rain upon wind vector retrieval | 1 |
| retrieved_wind_direction | equivalent neutral wind direction at 10 m | degrees |
| retrieved_wind_speed | equivalent neutral wind speed at 10 m | m s-1 |
| retrieved_wind_speed_uncorrected | wind speed without rain correction | m s-1 |
| time | date and time | seconds since 1999-1-1 0:0:0 |
| wind_obj | retrieved wind objective function value | 1 |
| DATA RECIPE | |
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| ANOMALIES | |
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| DATA CITATION POLICY | |
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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 | SeaPAC. 2020. QuikSCAT Level 2B Ocean Wind Vectors in 12.5km Slice Composites Version 4.1. Ver. 4.1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/QSX12-L2B41
For more information see Data Citations and Acknowledgments.
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| Version | Dataset | Version Date | Status | |
|---|---|---|---|---|
| 4.1 | QuikSCAT Level 2B Ocean Wind Vectors in 12.5km Slice Composites Version 4.1 | 2021-11-01 | COMPLETE | 2021-11-01T16:07:00.000Z |
| 4.0 | QuikSCAT Level 2B Ocean Wind Vectors in 12.5km Slice Composites Version 4.0 | Present | COMPLETE | |
| 3.1 | QuikSCAT Level 2B Ocean Wind Vectors in 12.5km Slice Composites Version 3.1 | 2021-11-02 | COMPLETE | 2021-11-02T14:44:00.000Z |
| 3 | QuikSCAT Level 2B Ocean Wind Vectors in 12.5km Slice Composites Version 3 | 2022-10-26 | COMPLETE | 2022-10-26T18:44:00.000Z |
| 1 | SeaWinds on QuikSCAT L2B Ocean Wind Vectors in 12.5km Slice Composites | Present | COMPLETE | |