11 Sep '12, 6am
El Nino’s effect on CO2 causes confusion about CO2′s role for climate change
It is well known that the solubility of carbon dioxide in water decreases with temperature so it should be no surprise that CO2 levels rise when SST’s rise. What they are missing is that this is a positive feedback loop. More CO2 produces more warming. This leads to higher SST’s and more CO2. The same thing seems to have happened during the Termination of the last glaciation. Solar flux over the South Pacific increased as a result of Milankovitch cycles. CO2 increased, which amplified the warming and, as a result of the positive feedback loop, the ice age ended abruptly. That is why CO2 lags the temperature rise shown in the Antarctic ice cores. But of course other positive feedbacks were also active including the ice albedo feedback.