Thread by @mazeguillaume

6/n I'll start the defense by the very beginning of it (should I ?), and like for many oceanographic studies, it all started seriously with the 1872-1876 Challenger Expedition. en.wikipedia.org/wiki/Challenge… #sharehdr

7/n In 1873, going from St Thomas to Bermuda up to Halifax, they collected these amazing deep temperature data: between 100 and 300m depths, the ocean temperature is nearly homogeneous from station 52 to station 25, i.e. over 1000km centered near Bermuda #sharehdr

8/n This is highly remarkable because this ocean layer (highlighted in red) with nearly uniform temperature extends through a particularly large region and thickness, which is totally unusual for the upper surface layer of the ocean ! #sharehdr

9/n To get the scale of this, imagine a water layer with uniform temperature (18C = Brest typical swimming temp), nearly as high as the Eiffel tower (see it on scale in the figure above, to the left) and larger than France (see below)! #sharehdr

10/n Now remember when you swim in the ocean in summer, how fast the temperature can drop from the surface to your feet ... told you, this kind of homogeneous mass, this scale, this close to the surface, is truly remarkable #sharehdr

11/n Let's get back to the coffee machine, or to work, I get lost #sharehdr