Upgrading of Global Sea Ice Emissivity OSI-404


Dear OSI SAF Sea Ice Emissivity User,

Issued Thu Jul 19 10:18:30 2018 UTC.

As part of our commitment to provide you with better data, we are pleased to inform you that we are upgrading our product "Global Sea Ice Emissivity OSI-404" on Thursday the 9th August 2018.

This will carry the following changes:
- We have added the effective emitting layer temperature in addition to the emissivity. The variable name is Effective Temperature (teff). The sea ice self emission brightness temperature is the product of the emissivity and the effective temperature. The effective temperature is computed using an empirical algorithm and the 6 and 10 GHz data from the AMSR2 instrument.
- We have added spatially and temporally varying uncertainties to the emissivity product. The variable name is Uncertainties (u). Uncertainties are provided for the user to estimate the quality of each individual data point.
- We have updated of the emissivity algorithm coefficients. This was done to minimize biases between the new daily and continuous validation methodology and the emissivity product.

Other than that, you should know that the product structure (file naming, variable names, dimensions, resolution) remains the same.

You can find a 5-day sample on ftp://ftp.dmi.dk/sat/ssmis_emiss/OSI-404-a/. In case you want to compare it to the current product, you will find the data for the same dates on ftp://ftp.dmi.dk/sat/ssmis_emiss/OSI-404/.

Should you have any questions, do not hesitate in contacting us.

Best Regards,