QuikSCAT ESDR Level 2 Ancillary Ocean Surface Fields Version 1.1
(QUIKSCAT_ESDR_ANCILLARY_L2_V1.1)| Version | 1.1 |
| Processing Level | 2 |
| Start/Stop Date | 2000-Jun-01 to 2009-Nov-22 |
| Short Name | QUIKSCAT_ESDR_ANCILLARY_L2_V1.1 |
| Description | This dataset contains model output interpolated in space and time to the ESDR product from the scatterometer on the QuikSCAT satellite, representing the first science quality release of these data (post-provisional after v1.0) funded under the MEaAUREs program. These auxiliary fields are included to complement the scatterometer observations, specifically for the QUIKSCAT_ESDR_L2_WIND_STRESS_V1.1 dataset.. Model variables include: i) ocean surface wind fields from ERA-5 short-term forecast (removed from the analyses times to reduce impacts from assimilated scatterometer retrievals at the beginning of the forecast); ii) estimations of precipitation from the GPM IMERG product; iii) estimation of the surface currents from the GlobCurrent project. The modeled ocean surface auxiliary fields are provided on a non-uniform grid within the native L2 QuikSCAT sampled locations at a nominal 12.5 km pixel resolution. Each file corresponds to a specific orbital revolution (rev) number, which begins at the southernmost point of the ascending orbit. The thumbnail shows data for two orbits - using all orbits for a single day will provide global coverage. Version 1.1 provides a set of updates and improvements from version 1.0, including: 1) improved variable metadata, 2) removed the GlobCurrent stokes drift variables, and 3) provided data source metadata including DOIs for the ERA-5, IMERGE, and GlobCurrent data sources. The primary purpose of this release is for science evaluation by the NASA International Ocean Vector Winds Science Team (IOVWST). |
| DOI | 10.5067/ESDQS-L2C11 |
| Measurement | OCEANS > OCEAN WINDS > SURFACE WINDS ATMOSPHERE > ATMOSPHERIC TEMPERATURE > SURFACE TEMPERATURE ATMOSPHERE > ALTITUDE > PLANETARY BOUNDARY LAYER HEIGHT OCEANS > OCEAN TEMPERATURE > SEA SURFACE TEMPERATURE OCEANS > OCEAN CIRCULATION > OCEAN CURRENTS OCEANS > OCEAN WINDS > WIND STRESS ATMOSPHERE > ATMOSPHERIC TEMPERATURE > SURFACE TEMPERATURE ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS ATMOSPHERE > ATMOSPHERIC WATER VAPOR > WATER VAPOR INDICATORS ATMOSPHERE > PRECIPITATION > PRECIPITATION RATE |
| Platform/Sensor | MODELS / Platform Name: MODELS (MODELS) Computer SENSOR Name: Computer (Computer) 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 | MEaSUREs ESDR of the Ocean Surface Vector Winds, Stress, and Their Dynamically-Significant Derivatives (MEaSUREs/OSWV) |
| Data Provider | Publisher: PO.DAAC Creator: MEaSUREs/OSWV Release Place: PO.DAAC Release Date: 2025-Apr-01 |
| Format | netCDF-4 |
| Keyword(s) | wind data, wind, ocean wind, wind speed, vector, vectors, stress data, wind stress, stress, ocean surface wind stress, ocean wind vector, ocean wind vectors, seawinds, quikscat, scatterometer, l2b, level 2, level 2b, version 1.1, v1, measures, esdr, auxiliary, ancillary, model, modeled |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Spatial Resolution: 12.5 Kilometers x 12.5 Kilometers Temporal Resolution: Hourly - < Daily Coverage Region: GLOBAL North Bounding Coordinate: 90 degrees South Bounding Coordinate: -90 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 2000-Jun-01 to 2009-Nov-22 Granule Time Span: 2000-Jun-01 to 2009-Nov-22 Projection Projection Type: Swath Projection Detail: Along-track Grid Ellipsoid: WGS 84 |
| DIRECT ACCESS | |
| Browse Granule Listing | |
| OPENDAP DATA | |
| Search Granules | |
| This dataset can be downloaded using the podaac-data-subscriber (the recommended tool for bulk downloading PO.DAAC data). It is a Python package for downloading one or many files using the command line interface. The URL redirects to the data-subscriber home page with instructions for utilizing the tool | |
| DIRECT S3-ACCESS | |
| Available for access in-region with AWS Cloud | |
Region | |
| us-west-2 | |
| podaac-ops-cumulus-protected/QUIKSCAT_ESDR_ANCILLARY_L2_V1.1/ | |
| podaac-ops-cumulus-public/QUIKSCAT_ESDR_ANCILLARY_L2_V1.1/ | |
AWS S3 Credentials | |
| Get AWS S3 Credentials | Documentation | |
| TOOLS AND SERVICES | |
| This dataset can be accessed with the Harmony subsetter service to subset and regrid data on-the-fly. Several subsetting options are available such as spatial, variable, temporal, and vertical level. The URL redirects to a general page with information about utilizing the service. An example query: https://harmony.earthdata.nasa.gov/C3378626164-POCLOUD/ogc-api-coverages/1.0.0/collections/all/coverage/rangeset?subset=lat(minLat:maxLat)&subset=lon(minLon:maxLon)&subset=time(startTime:stopTime)&format=application%2Fx-netcdf4 | |
| Name | Long Name | Unit |
|---|---|---|
| era_air_temp_2m | ERA5 reanalysis 2-meter air temperature | Degrees Celsius |
| era_boundary_layer_height | ERA5 reanalysis atmospheric boundary layer height | m |
| era_en_wind_direction_10m | ERA5 forecast equivalent neutral wind direction | degrees |
| era_en_wind_speed_10m | ERA5 forecast equivalent neutral wind speed | m s-1 |
| era_en_wind_u_10m | ERA5 forecast equivalent neutral wind speed in the East-West direction | m s-1 |
| era_en_wind_v_10m | ERA5 forecast equivalent neutral wind speed in the North-South direction | m s-1 |
| era_rel_humidity_2m | Relative humidity calculated based on ERA5 reanalysis inputs | 1 |
| era_sst | ERA5 reanalysis sea surface temperature | Degrees Celsius |
| era_wind_direction_10m | ERA5 forecast wind direction | degrees |
| era_wind_speed_10m | ERA5 forecast 10 meter wind speed | m s-1 |
| era_wind_stress_direction | ERA5 forecast surface wind stress direction | degrees |
| era_wind_stress_magnitude | ERA5 forecast ocean surface wind stress magnitude | N m-2 |
| era_wind_stress_u | ERA5 forecast instantaneous turbulent surface stress in the East-West direction | N m-2 |
| era_wind_stress_v | ERA5 forecast instantaneous turbulent surface stress in the North-South direction | N m-2 |
| era_wind_u_10m | ERA5 forecast 10-meter wind component in the East-West direction | m s-1 |
| era_wind_v_10m | ERA5 forecast 10 meter wind component in the North-South direction | m s-1 |
| flags | quality flags | bit |
| globcurrent_u | Globcurrent total surface current in East-West direction | m s-1 |
| globcurrent_v | Globcurrent total surface current in North-South direction | m s-1 |
| imerg_precip_cal | Calibrated IMERG precipitation rate | mm hr-1 |
| lat | latitude | degrees_north |
| lon | longitude | degrees_east |
| quality_indicator | quality indicator for wind retrieval | -1 |
| time | date and time | seconds since 1999-01-01 00:00:00 |
| DATA CITATION GUIDELINES | |
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| GENERAL DOCUMENTATION | |
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| USER'S GUIDE | |
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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 | MEaSUREs/OSWV. 2025. QuikSCAT ESDR Level 2 Ancillary Ocean Surface Fields Version 1.1. Ver. 1.1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/ESDQS-L2C11
For more information see Data Citations and Acknowledgments.
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| Journal Reference | B. W. Stiles, B. D. Pollard and R. S. Dunbar. 2002. Direction interval retrieval with thresholded nudging: a method for improving the accuracy of QuikSCAT winds, IEEE Transactions on Geoscience and Remote Sensing, 40, 1. https://doi.org/10.1109/36.981351 |
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| Version | Dataset | Version Date | Status | |
|---|---|---|---|---|
| 1.1 | QuikSCAT ESDR Level 2 Ancillary Ocean Surface Fields Version 1.1 | 2023-06-08 | COMPLETE | 2023-06-08T20:40:00.000Z |
| 1.0 | QuikSCAT ESDR Level 2 Modeled Ocean Surface Auxiliary Fields Version 1.0 | 2022-10-14 | RETIRED. | 2022-10-14T16:42:00.000Z |