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1. Brief description: There was a problem with the production of the forecast data due to an error in the ocean initial field (During the process of changing the KMA Ocean Data Assimilation System, the date setting error occurred. December's ocean initial data were used to run Glosea6, with model results showed DJF season trends). It affected only short period - 2. Recommendation: If the affected data was downloaded before , it should be deleted and the fixed version of the data re-downloaded. |
Issues in the real-time KMA forecasts because of an error in the sea ice initial field
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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. |
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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