Oceans
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This paper by Joe D'Aleo shows that most of the temperature changes over th last 100 years are related to a natural large scale cyclical climate flip-flop known now as the Pacific Decadal Oscillation.
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Ocean heat content is a much more robust metric than surface air temperature for assessing global climate change because the ocean's heat capacity is greater than that of the atmosphere by many orders of magnitude. The data from 3000 world-wide ARGO buoys shows falling ocean heat content from 2003 to 2008 while climate models projected rising heat content.
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The article explain how ocean oscillations in the Pacific and Atlantic, and volcanic aerosols, affects global temperatures.
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CO2 Science reviews how increasing CO2 concentrations might effect the North Altantic Thermohaline Circulation. The studies show that we don''t know how it might or might not change in the future.
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A team of NASA and university scientists has detected an ongoing reversal in Arctic Ocean circulation. The November 2007 study shows that many changes seen in upper Arctic Ocean circulation in the 1990s were mostly decadal in nature, rather than trends caused by global warming.