MetOp-A ASCAT Level 2 12.5-km Ocean Surface Wind Vector Climate Data Record Optimized for Coastal Ocean
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| DOI | 10.15770/EUM_SAF_OSI_0007 |
| Short Name | ASCATA_L2_COASTAL_CDR |
| Description | This dataset represents the first historically reprocessed Level 2 coastal ocean surface wind vector climate data record from the Advanced Scatterometer (ASCAT) on MetOp-A sampled on a 12.5 km grid. This coastal dataset utilizes a spatial box filter to generate a spatial average of the Sigma-0 retrievals from the Level 1B dataset and obtains additional winds near the coast. Since the full resolution L1B Sigma-0 retrievals are used, all non-sea retrievals are discarded prior to the Sigma-0 averaging. Each box average Sigma-0 is then used to compute the vector cell wind using the same CMOD7 geophysical model function as in the operational OSI SAF ASCAT wind vector datasets. With this enhanced coastal retrieval, winds are computed as close to ~15 km from the coast. Each file corresponds to one complete orbit and is provided in netCDF version 3 format. The beginning of the orbit files is defined near the South Pole. ASCAT is a C-band fan beam radar scatterometer, providing two independent swaths of backscatter retrievals, aboard the MetOp-A platform in sun-synchronous polar orbit. It is a product of the European Organization for the Exploitation of Meteorological Satellites (EUMETSAT) Ocean and Sea Ice Satellite Application Facility (OSI SAF) provided through the Royal Netherlands Meteorological Institute (KNMI). For more information on the MetOp mission, please visit: https://podaac.jpl.nasa.gov/OceanWind/MetOp. For access to more contemporaneous and near-real-time MetOp-A ASCAT 12.5km data, please visit: https://podaac.jpl.nasa.gov/dataset/ASCATA-L2-Coastal. For more timely announcements, users are encouraged to register with the KNMI scatterometer email list: scat@knmi.nl. All intellectual property rights of the OSI SAF products belong to EUMETSAT. The use of these products is granted to every interested user, free of charge. If you wish to use these products, EUMETSAT's copyright credit must be shown by displaying the words "copyright (year) EUMETSAT" on each of the products used. Use cases and feedback on the products will be much appreciated and in fact helps to sustain the reprocessing capability. |
| Version | 1.0 |
| Dataset Type | OPEN |
| Measurement | Oceans > Ocean Winds > Surface Winds > Ocean Surface Wind Vectors |
| Processing Level | 2 |
| Coverage | Region: Global Northernmost Latitude: 89.6 degrees Southernmost Latitude: -89.6 degrees Westernmost Longitude: 0 degrees Easternmost Longitude: 360 degrees Time Span: 2007-Jan-01 to 2014-Apr-01 |
| Resolution | Spatial Resolution: 12.5 km (Along) x 12.5 km (Across) |
| Projection | Type: Swath Detail: Twin-Swath, each 512.5 km wide, sub-track (nadir) gap of 737.5 km Ellipsoid: GEM6 |
| Latency | hours |
| Swath Width | 1 m |
| Sample Frequency | - |
| Temporal Repeat (Nominal) | 12 Hour |
| Temporal Repeat (Min) | 1.7 Hour |
| Temporal Repeat (Max) | 5 Day |
| Platform/Sensor | METOP-A / Platform Name: Meteorological Operational Satellite - A (METOP-A) Orbit Period: 101.3 minutes Inclination Angle: 98.7 degrees Ascending Node: 2007-Jan-01 21:30:00 ASCAT SENSOR Name: Advanced Scatterometer (ASCAT) Swath Width: 1800 km Description: Dual fan beam C-band (5.25 GHz) vertically polarized scatterometer, providing measurements across two 550 km swaths, separated by a 700 km nadir blind region. This dual swath configuration allows ASCAT to provide more than twice the daily coverage of the ERS 1 and 2 predecessors with a coverage of nearly 70% of the ice-free oceans each day. |
| Project | Meteorological Operational (MetOp) |
| Data Provider | Creator: EUMETSAT/OSI SAF Release Place: KNMI, Royal Netherlands Meteorological Institute Release Date: 2018-Apr-23 Resource: http://projects.knmi.nl/scatterometer/ascat_cdr/ |
| Keyword(s) | metop-a, metop, wind data, wind, ocean wind, wind speed, vector, vectors, ocean wind vector, ocean wind vectors, knmi, osi saf, eumetsat |
| Persistent ID | PODAAC-ASCDR-12C01 |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
| User's Guide | |
| CDR User Guide | https://projects.knmi.nl/scatterometer/publications/pdf/ascat_a_cdr_product_manual.pdf ASCAT Level 2 CDR User Guide |
| Project Materials | |
| ASCAT L2 Winds Data Record Validation Report | https://projects.knmi.nl/scatterometer/publications/pdf/ascat_a_cdr_validation.pdf Verhoef, A., J. Vogelzang and A. Stoffelen, 2016: ASCAT L2 Winds Data Record Validation Report Version 1.2. Technical Note, SAF/OSI/CDOP2/KNMI/TEC/RP/239, EUMETSAT. |
| Scatterometry Training Material | https://www.knmi.nl/scatterometer/training_material/ Scatterometry Training Material from KNMI |
| MetOp Mission Summary Page | https://www.eumetsat.int/website/home/Satellites/CurrentSatellites/Metop/index.html Mission and Instrument Overview |
| KNMI/OSI-SAF Publications | https://www.knmi.nl/scatterometer/publications/ Reports and Publications |
| Citation | EUMETSAT/OSI SAF. 2018. MetOp-A ASCAT Level 2 12.5-km Ocean Surface Wind Vector Climate Data Record Optimized for Coastal Ocean. Ver. 1.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.15770/EUM_SAF_OSI_0007.
For more information see Data Citations and Acknowledgments.
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| Journal Reference | Verhoef, A., J. Vogelzang, J. Verspeek and A. Stoffelen, Long-Term Scatterometer Wind Climate Data Records, IEEE Journal of Selected Topics in Applied Earth O, 2017, 10, 5, 2186-2194, doi:10.1109/JSTARS.2016.2615873. | |||||||
