As discussed in the previous posting, examination of ice cores can provide high quality data about the Earth’s climate from thousands of years in the past. Antarctica’s ice cores cannot be surpassed for the longest age records. Let us look once again at the Vostok ice core drilling. (Click on all the charts to enlarge.)
This illustration reverses the direction of time flow from that of the previous posting’s chart. It does expand the data from about 120,000 years ago to the present.
The chart blue line is the ice core temperature data referenced to the global temperature. The flat red line is the average of global annual temperature means for the period 1998 to 2008. This provides a reference with which to compare the past temperatures. And lastly, the green is the annual mean temperature for 2008. Several things are obvious. First, recent temperatures are not as warm as previous temperatures at their peak. Second, the globe began to exit the last glacial period about 15,000 years ago, and the temperature increased fairly rapidly (of course rapidly on this chart may be several thousand of years). It is not possible to attribute this rise nor really any other rise shown on this chart to something that man has done. The current period has been relatively stable.
Below shows the temperature data for EPICA Dome C charted with the Vostok data of the previous chart:
Time on this chart runs from the oldest on the left to the current time on the right. The Blue line is EPICA Dome C and the Red line is Vostok. Analysis of this chart is the same as the previous chart.
The infamous “hockey stick” temperature chart produced by Dr Michael Mann erased the Medieval warm period, when Greenland was green. While the hockey stick is largely discredited, the following chart shows ice core data from Greenland which puts the Medieval warm period back where it belongs.
The yellow box above may not contain large enough print to read so, here is what it says:
“From Greenland ice cores, researchers have reconstructed past temperatures back for 50,000 years. Above is a temperature history slice representing approximately 5000 years before the present (BP). The green curve is 3rd degree polynomial trend, which reveals an overall cooling trend since the height of the Minoan Warming.
Warning. The right end point (red circle) is approximately 100 years before the present. Needless to say, current temperatures and our perceived climate change is nothing out of the ordinary when compared to the past 5000 years.”
The warmers say that year 2015 temperature was the hottest in history. This posting shows that it was not the hottest in history and such claims are absurd. They make these claims for political reasons. Was it hotter than the year 1940 for example? Probably, although we can never be completely sure because the official temperature recorders continually revise the temperature history to support their contention that we are on a path to doomsday unless we do exactly what they tell us.
In the next posting we will look to see if CO2 drove the temperatures recorded in the ice cores.
H/T to C3Headlines.com for all the charts