Isotherm 0°C
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By checking the isotherm 0°C map, I discovered something that I didn’t notice so far.
It seems that IFS takes into account the altitude of the location which is not the case of ICON-EU. Look the two following screenshots for the same location which is roughly at 500m, at the same moment :
ISO 0°C with ECMWF (IFS)
ISO 0°C with ICON-EU
As you can easily see, the delta between the 2 values is 500m so the exact altitude of the location. If you choose other locations, you will see the same behaviour. There is always a delta fitting more or less with the altitude of the location, and not because the models are giving two different values,...
This means that the data of the 2 maps are not coming from the same calculation. IFS is given the altitude of the isotherm 0°C using the location as a reference so here 200m above Hockai (200+500=700m) while ICON-EU seems to give the altitude of the isotherm with the sea level as a reference.
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@gkikas-lgpz
Thanks for the reference to the old post. I did a search but didn’t find it -
Hi, thank you for reminding this, I am putting the issue on the "top of our stack".
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Hi, we adjusted the values of ECMWF freezing level so it is also AMSL now.
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@tz
Great news ! Now this layer will really useful for winter activities in mountains knowing the altitude of the 0°C isotherm. -
@tz
Excellent news !
