A Mediterranean Mystery [with a Saros solution]

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Interesting empirical evidence from the sunny Mediterranean points to geo-effective lunar cycles altering tidal ranges.

The waters of the Mediterranean are relatively calm and on a still day the sea at my favourite beach [Almayate – which is close to Malaga, Spain] can be as calm a millpond.

The tidal range at Almayate is [as Wikipedia states] very limited.

Being nearly landlocked affects conditions in the Mediterranean Sea: for instance, tides are very limited as a result of the narrow connection with the Atlantic Ocean.

The Mediterranean is characterised and immediately recognised by its deep blue colour.

https://en.wikipedia.org/wiki/Mediterranean#Oceanography

The sea currents at Almayate are also fairly benign.

Evaporation greatly exceeds precipitation and river runoff in the Mediterranean, a fact that is central to the water circulation within the basin.

Evaporation is especially high in its eastern half, causing the water level to decrease and salinity to increase eastward.

The salinity at 5 m depth is 3.8%.

The pressure gradient pushes relatively cool, low-salinity water from…