Guest essay by David Archibald’
Many good things come to an end and that includes the Modern Warm Period. Mild winters and early springs are now spoken of in the past tense. The peak of the Modern Warm Period was 2006 as shown by the oceanic lead indicator, the Gulf Stream, also called the North Atlantic Current. From Professor Humlum’s site, Figure 1 following shows the Argo data from a transect south of Iceland from 2004:
Figure 1: North Atlantic Current temperature 0 – 800 metres depth 2004 – 2018
The North Atlantic Current has cooled by 1.0°C to date since the peak in 2006. Figure 2 following incorporates data from the same region back to 1955:
Figure 2: North Atlantic Heat Content Anomaly 1955 – 2017
This figure shows that the North Atlantic Current has to date lost half the heat content it gained from the early 1980s.
Figure 3:…
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