Looking at the particulate distribution maybe, but they show the projected changes in temperature too at one point - If temperatures are reduced that much on average, then it won't matter if it's initially more pronounced in the North and less in the South - If such conditions prevail even for a few weeks then I doubt the end result will be anything other than a new so called "Snowball Earth" era. In very short order. The thing is that mean temperature changes do not work like people tend to think. We're talking day and night 365days a year. A -2.5C mean temperature for Southern Africa (-10 for a large area just a tiny bit north of us - Namibia... Angola) is nothing to simply dismiss. Our mean annual temperature is 17.5C, and we still get 40C days. That cool spot over Namibia and Angola will see a new mean annual temperature similar to what Germany currently has...
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In any case if the Northern Hemisphere temperatures are impacted that much, then permanent land and sea ice (reflective cooling effect) will spread to such a degree there that the global atmospheric energy budget is impacted for millions of years to come.
And what will happen to oceanic currents, even in the short term, is anybody's guess.
We're talking big huge changes. Globally.