Nicholas Tyrrell started writing about tropical/midlat dynamics  over 8 years ago

Commit id: 8bef9028fdbe2aea96e7c9fcf875adb971b76021

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You might ask; what if you changed the temperature of the Southern Ocean or the   North Atlantic, Atlantic or an area of ocean outside of the tropics,  would you get the same response of  land response?\\ temperature?\\  The answer is, no.\\   We've found that the The  tropical oceans have the greatest influence on land temperatures. The reason is that warmer tropical oceans result in lots of atmospheric convection from the surface up to about 10-15km above the ocean: the troposphere. Changes in colder   ocean temperatures will not cause the kind of convection that penetrates up into   the troposphere.\\   If [If  you add what we call a change the  temperature perturbation to of the troposphere in one part of  the troposphere, tropics, above the Pacific for example,  the tropical atmosphere will efficiently transport that perturbation temperature change  around the globe, so for globe. Away from the tropics the atmosphere behaves quite differently. You may have heard of the Coriolis force; it doesn't dictate which direction your toilet spins, that's  a big enough perturbation myth, but it does control the direction of cyclones, and large-scale atmospheric flows by pushing them to the left or right depending on which hemisphere you're in. The strength of the Coriolis force also changes, in the tropics it's very weak, and it becomes stronger as you move towards the poles. This means that if you heat the troposphere away from the tropics. - note: this is getting to technical/boring]  In  the Once tropics, once  the warmer temperatures reach the troposphere, troposphere  they spread out and encircle the earth. The ocean temperature changes are amplified because the land is more responsive to these tropospheric temperature changes.\\