The Sinkhole – Our Descent into the Next Ice Age

Watts Up With That?

Guest essay by Eric Worrall

Back in May, Climate scientist Ed Hawkins published a scary spiral graph which appeared to show global warming leaping out at you. As a homage to Hawkins’ effort, I created a similar graph, covering the last 10,000 years, rather than just covering temperatures since 1850. The effect of the longer timescale is quite different to the Hawkins original.

The Sinkhole - Our Descent into the Next Ice Age. The Sinkhole – Our Descent into the Next Ice Age.

The source data is ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/isotopes/gisp2_temp_accum_alley2000.txt

The spiral graph is obviously more art than science, but it presents some interesting features. The radius of the circle is related to the temperature anomaly – warmer temperatures have a larger radius. The factors are obviously chosen for artistic impact – just as Hawkins’ factors were.

On a 10,000 year timescale the spiral graph does emphasise how cold modern temperatures are, compared to the rest of the Holocene – at least…

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Author: Canadian Climate Guy

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