"The Arctic will retain its power to amaze for a long time. Yet it is now changing beyond the usual regional and annual variations in sea-ice formation, glacier melt and so forth. The Arctic is clearly melting. Its floating ice cap is shrinking and thinning and its glaciers are retreating. By the end of this century, maybe much sooner, there will be frequent Arctic summers with almost no sea...
Northern and Southern Hemisphere Temperature Histories, 1998-2010
"There is very little exchange of air between the northern and southern hemispheres, and basic climate science shows that most sulfates from China will rain out before they get across the thermal equator. In fact, there is a great deal of literature out there published by luminaries like the Department of Energy's Ben Santer and NASA's James Hansen claiming relative cooling of the northern hemisphere from sulfates, compared to the southern.
So, if it is indeed sulfates cooling the warming, given that there is no net change in global temperature, then the northern hemisphere should be cooling since 1998 (the first year in Kaufmann's paper) while the southern warms. Here are the sad facts: [see chart].
The opposite is occurring. Why this test was not performed eludes me. Perhaps that is because it provides yet another piece of evidence supporting the hypothesis that we have simply overstated the sensitivity of surface temperature to changes in carbon dioxide."
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