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Response to NickB79 (Reply #22)

Wed Dec 25, 2019, 10:29 AM

23. Global Temperature Changes

are the most dramatic at the poles, especially the northern hemisphere. Equatorial temperatures are somewhat mitigated by the oceans. I can see continental climate temperatures along the equator rising but the bulk of the global average will be impacted by the northern hemisphere polar temperatures. That has a lot to do with the surface snow-cover changes. Snow at the upper latitudes is a great reflector of solar radiation. It's also a great emitter in the infra-red spectral range so it has a double whammy on temperatures; it reflects sunlight preventing absorption and radiates heat further reducing temperatures. The loss of Arctic sea ice coupled with less year-round snow cover in the northern latitudes by itself leads to warming even without considering the impacts of rising CO2 levels.

The breakdown of the thermohaline circulation in the North Atlantic is a big deal. Theoretically lower temperature contrasts as the poles warm slacken the zonal wind fields, which weakens the Gulf Stream circulation. Greenland melt freshens the North Atlantic and makes it possible to shut the whole circulation down. The ice core record on Greenland is alarming because of how quickly the climate in our neck of the the world can change. It appears our climate acts more like a drunken college student lurching from one side of the street to another. That is just as dangerous to us as a gradual decadal warming trend we are currently marking and also explains why scientists have abandon the term Global Warming for Climate Change over the years.

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c-rational Dec 2019 OP
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