The latest scary map from NOAA and NASA showing the earth glowing red hot from Climate Change. You can click here to see it as a movie and read the blurb.
The trouble is the North Atlantic cooled considerably over this four year period. No reason is given for this weird behaviour. Perhaps there was a lack of CO2 in this vicinity in 2018, which is strange because weather patterns usually ensure atmospheric gases are well mixed.
There is another explanation: this part of the ocean was warmer in 2014 than in 2018. Ocean temperature here must be highly variable for reasons unrelated to CO2 concentration.
The World Ocean Circulation Experiment (WOCE), collected hydrographic data from the world’s oceans between 1990 and 1998. The following map shows the WOCE sections for the North Atlantic:
Section A25 from the tip of Greenland to Portugal crosses the cool region in the NASA-NOAA map. Here is a plot showing potential temperature along this section. (Potential temperature is measured temperature corrected for pressure. Black shows the ocean floor. It looks spiky because the horizontal scale is so contracted.)
Salinity shows an even more confused picture:
Compared with most oceanographic sections these sections are poorly stratified particularly at the left-hand side, south of Greenland. The perturbations occur down to the ocean floor and near the Mid-Atlantic Ridge (the double black spike on the left) implying they are of volcanic, hydrothermal origin. The MAR is particularly active at its northern end.
The “cold spot” in the North Atlantic cannot be accounted for in terms of the greenhouse effect. It can be readily accounted for in terms of variable volcanic heating of the ocean. Why is this ignored by NOAA and NASA?
By the same argument the “hot spot” to the north of Greenland can be accounted for by more recent hydrothermal activity on the Gakkel Ridge. In both cases the temperature difference is 4 deg C – the difference between the temperature of ice formation and the temperature of the deep ocean. Volcanic heating does not itself cause the observed temperature variations. It acts indirectly by changing the pattern of circulation and intermittently bringing deep ocean water to the surface.