ASCAT BUFR data descriptors. Eumetsat OSI SAF coastal, EARS coastal, EARS 25-km, OSI SAF 25-km, OSI SAF 12.5-km

Below you will find brief information for Wind product OSI SAF 25-km, Wind product OSI SAF 12.5-km, Wind product OSI SAF coastal, Wind product EARS 25-km, Wind product EARS coastal. These wind products are a range of air-sea interface products, namely: wind, sea ice characteristics, Sea Surface Temperatures (SST) and radiative fluxes, Surface Solar Irradiance (SSI) and Downward Long wave Irradiance (DLI). They are distributed in two resolutions: a 50-km resolution product with 25-km cell spacing and a 25-km resolution coastal product with 12.5-km cell spacing. Both resolutions are available as a regional (mainly covering the Northern Hemisphere) EARS product with a timeliness of approximately 25 minutes from sensing time and as a global OSI SAF product with a timeliness of approximately 1.5-2 hours from sensing time.

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ASCAT Wind Product User Manual - OSI SAF 25-km, 12.5-km, coastal, EARS 25-km, coastal | Manualzz

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Key features

  • Wind direction

  • Wind speed

  • Sea Ice characteristics

  • Sea Surface Temperatures

  • Global coverage

  • Timeliness

Frequently asked questions

Although the Level 1 product is fully calibrated now using three transponders on the ground, the backscatter values are corrected using a calibration table, derived from a geophysical wind model. The backscatter values in the Level 2 wind product are however plain copies of those in the Level 1 product. The corrections are very small and expected to be partly incorporated into a new version of the Geophysical Model Function.

The ASCAT BUFR L2 products are disseminated on EUMETCast. The BUFR and NetCDF products are also made available on a password-protected ftp site (data from the last three days only). The Metop-A ASCAT 25-km global winds in BUFR format are disseminated on the GTS.

The expected accuracy is defined as the expected bias and standard deviation of the primary calculations. The accuracy is validated against in situ wind measurements from buoys, platforms, or ship, and against NWP data.

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