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Hello Marion,
I took pictures of a very similar looking hoverfly in May last year in the Algarve on the peak of Picota (774 m).
You might watch my pictures at iNaturalist here: https://www.inaturalist.org/observations/148028123.
There are only two sightings of this Merodon species (both from the Algarve), which were confirmed:
https://www.inaturalist.org/observations/36471914 and
https://www.inaturalist.org/observations/36472330
But you probably know this already.
Unfortunately, hoverfly experts are rare and correct ID from photos is often difficult or even impossible.
Best regards,
Volker