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1. Brief description: Problem was identified in the initial fields for the real-time forecasts (reforecasts were not affected): https://jira.ecmwf.int/servicedesk/customer/portal/4/SD-78328 "Sea ice initial values were prescribed along the coastline of the Northern Hemisphere's mid-to-high latitudes when the model ran due to problems with pre-processing of the sea ice initial field. (First slide, some of the Southern Hemisphere was also abnormally values prescribed.) The longer the lead time(t=60), the bigger the difference of ice cover and SST in the results. (2nd to 3rd slides). In the case of 2m temperature(4th slide), it was confirmed that the temperature was low with a distribution similar to the incorrectly prescribed sea ice values, and the spatial distribution disappeared after 8 days, but there was a difference in the forecast values. Only some ocean parameters and 2m temperaturewere checked, but it affected other atmospheric variables too."
2. Recommendation: If the affected data was downloaded, it should be deleted and the fixed version of the data re-downloaded once available. |
Three problematic ocean parameters Parameters discontinued since 9th of August 2023 (and since 11th of November in the reforecast)
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1. Brief description: Three of nine newly introduced ocean parameters in KMA model outputs since the 1st of July 2023 seem to be problematic:
It was decided to remove them from the archive since resp in the realtime resp in the reforecast outputs (The reforecasts are produced fairly in advance). 2. Recommendation: Users are adviced not to use those parameters archived before their discontinuation. |
JMA (rjtd)
The valid times of the maximum/minimum temperature are wrong in the re-forecast data (impacts ALL hindcast data for the model version: 2014-03-04).
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