Real Global Temperature Trend, p8 – Major eruption of Mexican Popocatépetl volcano can cause temporary cooling, 1997 Nature study warned

In our series about the ‘Real’ Global Temperature Trend we’ve learned not to exaggerate the climate cooling potential of volcanoes. That is because many volcanoes are of the wrong type, lie on the wrong latitude – or, the vast majority, … Continue reading

Real Global Temperature Trend, p7 – ‘Volcanoes did not cool the Earth in the 1980s, so Climate Sensitivity at least 2.1 to 8.9 degrees Celsius’

Even if you assume a low value for the variables of SO2 cooling and the rate of heat uptake by the deep ocean. Yes, that caught our eyes too. “Studies of these [volcanic eruptions and El Niño] effects using climate models … Continue reading

A new ‘super El Niño’ would peak ~0.2 Celsius above the one in this graph

Shown below is a graph of the satellite-derived University of Alabama global temperature dataset (those fellows that each year in early January beat NOAA/NASA/MetOffice/WMO etc by being the first to say ‘how warm it was’). Clearly visible is the peak … Continue reading

Superscale volcanic eruptions can disappoint as climate coolers, Pleistocene record shows

Yes, during ice ages it can be a bit chilly. That’s why stuff that happened in the Pleistocene is easily linked to climate cooling. Like asteroids falling from the sky. Or volcanoes erupting.

Polarity reversal and European super volcano during last ice age – probably unrelated, but does make for easy dating

ice age polarity reversal
The last ice age is known for periods of high climate variability like the period between the Last Glacial Maximum and the Younger Dryas, towards its end. Also about halfway through the ice age temperatures spiked and dipped rapidly. And then about 41,000 years ago suddenly Earth’s magnetic field weakened by some 95%, allowing a bombardment of cosmic rays, and a couple of centuries during which your compass would direct you towards Antarctica. Following this Earth´s northern hemisphere experienced the biggest volcanic eruption of the last 100,000 years, which occured in Italy.

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Can medieval volcanic eruptions have caused global cooling when tree rings don’t show?

A group of researchers led by climatologist Michael E. Mann of the Earth System Science Center of Pennsylvania State University says the dendrochronological record does not always offer the best temperature reconstruction. Apparently some trees find it hard to distinguish … Continue reading