The only two factors which affect the climate, are fluid movements in the Earth’s core and CO2.
Scientists compared existing data from models of fluid movements within Earth’s core and length-of-day observations against two sets of global surface temperature data extending back to the 19th century – from NASA’s Goddard Institute and the UK’s Met Office. Human-produced temperature changes based on climate models of the Earth’s atmosphere and ocean were then subtracted to generate corrected temperature records.
A portion of the study shows after 1930 global surface air temperatures began to rise without corresponding changes in other variables.
And while researchers now turn their attention toward a scientific explanation of these correlations, it’s clear that the Earth core’s effect on climate is substantially smaller than human effects.
“It’s just a wiggle on top of what ever else is going on,” said JPL’s Steve Marcus, a co-author of the study. “It’s just an added variability on top of these larger trends we’ve observed in climate over the last century or so, when human global warming has certainly been kicking in.”
The study, says Dickey, “gives you a timetable showing when global change came into play, in the 1930s and 1940s, so it’s very interesting to see that effect, and that agrees with our knowledge of our industrialization of the world.”
Michael Ghil, a distinguished professor of climate dynamics at UCLA familiar with the research calls the graph “pretty striking.”