Empirical Climate Sensitivity in the Mauna Loa Era: 1959-2017
10 Pages Posted: 25 Apr 2018
Date Written: April 6, 2018
Monthly means of Mauna Loa atmospheric CO2 are used in conjunction with surface temperature data from two different sources for sample periods 1959-2017 and 1979-2017 to estimate observed Charney climate sensitivity (ECS) for each of twelve calendar months and five regions. Significant differences among regions and calendar months are found but with close agreement between the two temperature datasets except for land surfaces in the Northern Hemisphere. The results suggest that the Hadley Center land surface temperature reconstruction for the Northern Hemisphere contains anomalies. Other than land in the Northern Hemisphere, the observational estimates of regional mean Charney climate sensitivities are low. They range from 1.23 to 2.00 for sea surfaces, 2.32 to 2.35 for land surfaces, and 1.88 to 1.97 for all surfaces combined.
Keywords: Equilibrium Climate Sensitivity, Greenhouse Effect, Carbon Dioxide, Fossil Fuel Emissions, Anthropogenic Global Warming, Climate Change, AGW
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