Smoking gun graph reveals NASA’s Hansen’s research showed Medieval Warm Period warmer than today – 1990 UN IPCC report used Hansen’s 1981 study
Via RealClimateScience.com: 'Smoking gun showing that claims the 1990 IPCC MWP graph was derived from CET only - are bogus. It came from Hansen 1981, and used multiple global proxies.'
The UN IPCC graph was derived from James Hansen’s 1981 study, which was taken from temperatures in England, California and Greenland.
“Climate fraudsters frequently claim that the 1990 IPCC temperature graph below showing the Medieval Warm Period (MWP) was only a representation of Central England Temperatures (CET) and was not global.”
This is nonsense. The graph was derived from James Hansen’s 1981 study, which was taken from temperatures in England, California and Greenland.
(b) is based on temperatures in central England, the tree limit in the White Mountains of California, and oxygen isotope measurements in the Greenland ice (W. Dansgaard of the Geophysical Isotope Laboratory, University of Copenhagen, pers. comm.), with the temperature scale set by the variations in the last 100 years
The overlay below shows that the 1990 IPCC graph is essentially the same graph as Hansen 1981.
The MWP was real.
Flashback: UN Scientist urged: ‘We have to get rid of the Medieval Warm Period’
Flashback: First, they ‘had’ to get rid of Medieval Warm Period & now this! A new paper in Nature suggests CO2 leads temps — but has some serious problems
‘More than 700 scientists from 400 institutions in 40 countries have contributed peer-reviewed papers providing evidence that the Medieval Warm Period was real, global, & warmer than the present’ – Climate Depot’s Medieval Warm Period Round Up of Studies
Study: ‘Globally, 99% of all paleoclimatic temperature studies compiled show a prominent warming during Medieval Warm Period (MWP)
Check out latest MWP map here.
New paper shows N. Greenland was warmer during the early 20th century (1920-1940) & during Medieval Warm Period
Roman and Medieval Warm Periods vs. the Current Warm Period – Studies ‘clearly demonstrating that there has been nothing unusual or unprecedented about the mean level of global warmth experienced over the past 18 years of no significant upward or downward trend.’
New Study: Sea Surface temperature warmer in both the Roman and Medieval Warm Period – Published in Chinese Science Bulletin
More Glacier Studies Confirm Roman And Medieval Warm Periods Were Just As Warm As Today
05 Oct 1950 – Weather Theory Debunked History Gives Lie To Cycles
Alpine Glaciers Were Of Similar Size During Medieval Warm Period, New Study Finds – A new paper published in The Cryosphere reconstructs Alpine glacier fluctuations over the past 1600 years and finds glacier lengths of 7 Alpine glaciers were similar during the Medieval Warm Period and the end of the 20th century.
Review paper finds the Medieval Warm Period was global and its peak warmth likely significantly greater than the present – ‘The Medieval Warm Period was not only a global phenomenon, but that its peak warmth was very likely significantly greater than that of the Current Warm Period.’
Warmer Waters during Medieval Warm Period: 20 researchers report that ‘in recent decades temperatures have been similar to those inferred for the ‘Medieval Climate Anomaly’
In the 1990 IPCC report, the Medieval Warm Period was much warmer than the late 19th century.
But in the 2001 IPCC report, the Medieval Warm period disappeared and became much cooler than the late 20th century.
ScienceMag: Medieval Warm Period global, 0.65 °C warmer than present: ‘The largest ocean was 2 °C warmer than today when ancient civilizations exploded’ – Former Harvard Physicist Dr. Lubos Motl: ‘Please don’t invent fairy tales that a change by half a degree has to be due to a sin, has to be a punishment, and has to be dangerous. It is absolutely clear that none of these claims is true.’
New paper finds 4 Alaskan glaciers are about the same size as during the Medieval Warm Period
Review paper finds the Medieval Warm Period was worldwide and warmer than the present: ‘Earth’s current level of warmth need not be attributed to the current high level of the air’s CO2 content; for the peak warmth of the global Medieval Warm Period was even greater than it has been over the past couple of decades, and at a time when the air’s CO2 concentration was approximately 100 ppm less than it is today’
Review paper finds global Medieval Warm Period was significantly warmer than today, when CO2 was ‘safe’
Review finds the Medieval Warm Period was global & generally warmer than the present, when CO2 was ‘safe’
‘So, why are the warmists so obsessed with denying this? Is the mid-20th century cooling period so ‘inconvenient’ that it has to be erased from history like the Medieval Warm Period?’
New Paper: Evidence of a Medieval Warm Period in Antarctica -‘We here review the findings of several studies that have found evidence for the Medieval Warm Period in a region that is as far away from lands bordering on the North Atlantic Ocean as one could possibly get, i.e., Antarctica’
The Medieval Warm Period was global & explains the Current Warm Period — Evidence of a Medieval Warm Period in Antarctica – ‘Review of the findings of several studies that have found evidence for the Medieval Warm Period in a region that is as far away from lands bordering on the North Atlantic Ocean as one could possibly get, i.e., Antarctica’