NRT Notification Detail
| Updates to ROM SAF netCDF products for Metop NRT data (GPAC 3.4) |
| DATE: 2024-03-08 15:24 TYPE: DATA |
| Description |
| Dear ROM SAF Data User Issued: 2024-03-08 15:22 UTC On 18 March, the ROM SAF will update the netCDF files for the Metop NRT products. The ROM SAF processing system will be upgraded to GPAC 3.4 in coordination with the upgrade to PPF 6 at the EUMETSAT Secretariat. Generally, the netCDF files will become more similar to other ROM SAF netCDF files (like, e.g., Spire NRT, Sentinel-6 NTC, Metop Offline/ICDR). This includes: - Additional global attributes - Inclusion of optimized bending angle in atm files - Corresponding height levels between level 1B and level 2A data - Additional diagnostics, e.g., LC model bending angle in atm files - Orbit samples in dedicated reference group - Forward modelled bending angle and refractivity in bgo and bgn files - Geopotential height in bgo and bgn files Filenames will change, e.g.: Currently: atm20240204_203457_M01_2140880086_N0023_XXXX.nc To become: atm_20240204_203457_METB_G014_N_3400_0020.nc The following netCDF filetypes will become publicly available: atm netCDF-3 observed profile (lat, lon, bending angle, refractivity, dry temperature, and tropopause height) wet netCDF-3 observed profile (output from 1D-Var, i.e., temperature, pressure, humidity) dis netCDF-3 observed profile (thinned products from the atm file together with products from the wet file) bgn netCDF-3 ECMWF operational analysis profile (bending angle, refractivity, temperature, etc.) bgo netCDF-3 ECMWF operational forecast profile (bending angle, refractivity, temperature, etc.) The bgo file replaces the current bgr file. The data in the bgo and bgn files are extracted from GRIB files and interpolated in time between the two nearest 6-hourly forecasts (bgo) or analyses (bgn). They are not made available in NRT, but are available with a delay of about one day. In addition, there will also be changes to the BUFR (bfr) files. Please see the announcement concerning the BUFR files here: https://user.eumetsat.int/news-events/news/updated-gras-ro-processor-offers-eumetsat-s-first-space-weather-data Besides the changes mentioned above, there are changes to the quality of the observations as follows: - Reduction of hemispheric-dependent biases between rising and setting occultations at high altitudes - Improvement to the statistical optimization in the refractivity retrieval - Significant increase in the number of nominal occultations (due to changed QC at the ROM SAF) - Slightly larger standard deviation (a consequence of the larger number of nominal occultations) - Larger standard deviation of level 2B specific humidity Please do not hesitate to contact us if you have any questions related to the data. With kind regards The ROM SAF Team |
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