Saturday, January 12, 2013
Resolving Bronze Age Atlantic Surface Temperature Anomoly
This is a revisit to an important problem. Sea bed work has shown us that during the Bronze Age or between 4000 BC through 1000BC, that the Northern Atlantic surface waters were two degrees warmer. My conjecture, albeit unsatisfactory was that the Sahara and the Middle East had remained vegetated during most of this and retained more warmth that somehow fed back to the ocean.
We have recently come to understand that the 1159BC geological event was vastly more important than I had ever suspected. Land masses the size of Ireland, France, Britain and Japan associated with the Mid Atlantic Ridge, the Bahama Bank and the Cuban Ridge to Yucatan subsided over a couple of days. This was a correction in the crust that offset the one mile or so rise of the Hudson Bay Basin and the related hydrostatic imbalance.
This strengthened the volume available to the Gulf Stream and also improved heat flow directly into the Arctic resulting in a cooler Atlantic.
This turned out to be a minor adjustment in the Holocene regime and it is geologically stable although we cannot write of minor subsidence still. We should be stable for millions of years matching that of the Cretaceous were the Tethys Sea ruled.
It is really quite a remarkable dispensation. The narrow Atlantic provides us a heat pump sufficient to eliminate Ice Age Conditions in the Northern Hemisphere while the Pacific remains cut of from either the Arctic or the Atlantic and exchanges heat with the conveniently located Antarctic Ice Age. All remaining lands in the Southern Hemisphere are well north to allow easy development.
All that we have left to do is to reforest the Sahara and the Middle East and clean up the odd mess.