The continent Euramerica ( or Laurussia ) was created in the early Devonian by the collision of Laurentia and Baltica, which rotated into the natural dry zone along the Tropic of Capricorn, which is formed as much in Paleozoic times as nowadays by the convergence of two great air-masses, the Hadley cell and the Ferrel cell.
42.
:In a nutshell, it seems you don't get much rain around the Persian Gulf and the Red Sea because the atmospheric circulation known as the Hadley cell carries water away from the Middle East, and the mountains around the Iranian plateau ( mostly, I think, the Zagros Mountains ) trap what rain does blow in.
43.
The "'polar easterlies "'( also "'Polar Hadley cells "') are the dry, cold prevailing winds that blow from the high-pressure areas of the polar highs at the subsides at the poles creating the high pressure, forcing an equatorward outflow of air; that outflow is then deflected westward by the Coriolis effect.
44.
The page Subtropical ridge hints at a bit more : " The divergence over the near-equatorial trough leads to air rising and moving away from the equator aloft . As it moves towards the Mid-Latitudes, the air cools and sinks, which leads to subsidence near the 30th parallel of both hemispheres . " The impression I get from reading these, and other pages, is that the Hadley cells and the polar cells are the driving forces, while the in-between mid-latitude Ferrel cell exists mainly because the polar and Hadley cells have a gap between them.
45.
The page Subtropical ridge hints at a bit more : " The divergence over the near-equatorial trough leads to air rising and moving away from the equator aloft . As it moves towards the Mid-Latitudes, the air cools and sinks, which leads to subsidence near the 30th parallel of both hemispheres . " The impression I get from reading these, and other pages, is that the Hadley cells and the polar cells are the driving forces, while the in-between mid-latitude Ferrel cell exists mainly because the polar and Hadley cells have a gap between them.
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