The author discovered an issue with the diurnal cycles of wind speeds in ERA5. The wind speeds at 10 m, 100 m and also on lower model levels, exhibit gaps at 10:00 UTC and following hours and similarly but in a lesser extent at 22:00 UTC. The wind deficit at 10:00 UTC may be larger than 0.5 m s−1 on average.
The issue was reported to ECMWF which acknowledged the problem, which is linked to the assimilation process, affects mostly low latitude oceanic regions but also Europe and North America, and is not possible to correct (ERA5 data documentation, 2020). The issue appears at both 10:00 and 22:00 UTC but is more visible in convective atmospheric conditions thus appearing mostly at 10:00 UTC, during the day, over continental France.
To address this issue, ERA5 forecasts (denoted “fc” hereafter) were downloaded and studied in addition to the usual analysis data (denoted “an”). The forecasts do not exhibit the issue at 10:00 and 22:00 UTC but there may be jumps at 07:00 and 19:00 UTC when moving from one forecast stream onto the next. These jumps are small or not visible over continental France.
Best,On 14 Aug 2021, at 03:28, Umed Paliwal <paliwa...@gmail.com> wrote:
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Dear All,
I am doing some PhD work on offshore CAES for WT and using the Sesame DNVGL software.
I know this has nothing to do with this trail but since I am seeing the group so helpful I though of promoting maybe you can guide me to some similar groups about my studies .. especially if the Sesame DNV software is being used.
Apologies for the intrusion but maybe you can help ..
Thanks,
Peter Vella
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