SNIP

I recall reading a book about sailing and it mentions that between Start
Point and the Isle of Wight there is a slack zone of current caused from the
encroaching Atlantic current coming up against the current from the North
Sea. Maybe there is a slight upwelling of deeper water in that area?
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Nick.
Otter Valley, Devon
83 m amslhttp://www.ottervalley.co.uk

Yes, the general opinion seems to be that this summer cold pool is due
to the meeting of the tides in the Isle of Wight area. I should
imagine that the water in the tide coming around from the North Sea
has different characteristics (salinity etc.) from that coming in from
the Atlantic, resulting in colder deeper water finding it's way to the
surface.

Graham