New Proof That The Historical Local weather Was Hotter Than Immediately – Are You Betting On That?
Under fire from science
Two recently published studies confirm that thousands of years ago the climate was just as warm or warmer than it is today – a fact disputed by some believers in the narrative of largely man-made global warming. During this period, long before industrialization and SUVs, CO2 levels were much lower than they are today.
A study shows that the period known as Roman Warming was the warmest in the past 2000 years. The other study provides evidence that it was just as warm 6,000 years ago. Both studies confirm the occurrence of an even warmer period immediately after the end of the last ice age 11,000 years ago known as the Holocene Thermal Maximum.
The first study, carried out by a group of Italian and Spanish researchers, reconstructed sea surface temperatures in the Mediterranean over the past 5,300 years. Since temperature measurement with scientific thermometers only dates back to the 18th century, the temperatures for earlier periods must be reconstructed from proxy data using indirect sources such as tree rings, ice cores, leaf fossils or boreholes.
This particular study used fossilized amoeba skeletons found in seabed sediments. The ratio of magnesium to calcium in the skeletons is a measure of the sea water temperature at the time the sediment was deposited; A time axis can be created by radiocarbon dating. The researchers focused on the central part of the Mediterranean, specifically the Sicily Canal, as indicated by the red arrow in the image below. The samples came from a depth of 475 meters.
Analysis of the data revealed that the ancient sea surface temperatures in the Sicily Channel in the period of 3300 BC. Until July 2014 it was between 16.4 degrees Celsius and 22.7 degrees Celsius. This is shown in the next figure, with the dark blue dashed line representing the raw temperature data of the Sicily Canal and the thick dark blue solid line showing smoothed values. The other lines are Mediterranean temperatures that have been reconstructed by other research groups.
With the exception of the Aegean data, all of the results show significant warming during Roman times, from 0 AD to 500 AD, when temperatures were about 2 degrees Celsius (3.6 degrees Fahrenheit) above the average for Sicily and in later centuries the western Mediterranean and were much higher than today’s Sicilian temperatures. The high temperatures in the Aegean result from their inland nature. During the 500 years of Roman warming, the Roman Empire flourished and peaked. The subsequent cooling, as shown in the figure above, led to the collapse of the empire before the medieval warm period, the researchers say.
The second study was carried out by archaeologists in Norway, who discovered a treasure trove of arrows, arrowheads, clothing and other artifacts discovered by ice retreat in a mountainous region of the country. Since the artifacts would have been deposited had no ice covered the ground and are only now being exposed due to global warming, temperatures must have been at least as high as they are today in the many periods the artifacts were discarded.
Read the full article here.
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