I saw a weird news article the other day.
They are claiming that the sea level in Dublin Bay is rising twice as fast as anywhere else.
This presents me with a little puzzle.
I have a rudimentary knowledge of physics. I grant I’m not quite at Nobel status, but nevertheless….
The last time I looked, water is a liquid normally. I know that it can be a gas or a solid under the right conditions but for the purposes of this conundrum we’ll assume it’s a liquid. And liquid flows. And because it can flow it tends to find it’s own level due to gravity. With me so far?
Now on a cosmic scale, I can understand that the water level at the Equator will be higher than anywhere else because of centrifugal force. People tend to forget that our globe is spinning at an alarming rate? I am assuming that we are talking averages and ignoring tidal fluctuations. I can also understand that levels will temporarily be raised or lowered by atmospheric pressure and we will ignore them. What we are pondering here is average levels measured over the course of a year or more.
So all else being equal, why should the water in Dublin Bay be higher than anywhere else?
Is there some weird gravitational pull buried deep underground? Is it down to the quantities of raw sewage being pumped in every day? Is it the world renowned Dublin hospitality that’s attracting it into the bay? Is it all down to the ferries and the odd cruise ship displacing vast volumes of sea?
As a ship enters Dublin Bay, the captain cries over the Tannoy – “All hands on deck! The ship’s going up a hill.”