Sentences with phrase «model medieval warm period»

Not exact matches

But humans are not the cause of the current changes any more than they were for the impossible - for - models - to - predict Medieval Warm Period and Little Ice Age.

His Hockey Stick model wiped out both the Medieval Warming Period and the Little Ice Age, both of which were well documented in history, literature, art and science.

Place yourself at about this temperature in the Medieval Warm Period or the Roman Warm Period and look 30, 50, 100 years beyond and that will be closer than any other model.

The AMO during the Little Ice Age was characterized by a quasi-periodicity of about 20 years, while the during the Medieval Warm Period the AMO oscillated with a period of about 45 to 65 years... The observed intermittency of these modes over the last 4000 years supports the view that these are internal ocean - atmosphere modes, with little or no external forcing... However, the geographic variability of these periodicities indicated by ice core data is not captured in model simulations.&Period the AMO oscillated with a period of about 45 to 65 years... The observed intermittency of these modes over the last 4000 years supports the view that these are internal ocean - atmosphere modes, with little or no external forcing... However, the geographic variability of these periodicities indicated by ice core data is not captured in model simulations.&period of about 45 to 65 years... The observed intermittency of these modes over the last 4000 years supports the view that these are internal ocean - atmosphere modes, with little or no external forcing... However, the geographic variability of these periodicities indicated by ice core data is not captured in model simulations.»

Additionally, when a computer model indicates that the Medieval Warm Period did not exist, that raises a red flag for me, for the archeological record is quite definitive on this subject, i.e. its existence is bona fide.

Having a global Medieval Warm Period frees Mann from having to support the idea that climate models vastly overstate warming.

The growth rings of trees provided the evidence for reconstructions of what climatologists call the warm Medieval period, and the researchers matched the picture from the past with 17 different computer model predictions of the climate later in the 21st century.

Current GCM models may have realistic - seeming weather patterns, but are totally incapable of producing phenomena that look like the Holocene (Little Ice Age, Medieval Warm Period, Roman Warm Period, Holocene Optimum, the steady decline of temperature on average over the last 3,000 years, etc.) The Climate Science community has, instead, taken the path of trying to claim that these swings didn't occur (Michael Mann's «Hockey Stick», etc.) This does not give me a lot of confidence in the rest of their «science».

Anyone who admits that would also have to admit that the climate models (which don't «predict» a Medieval Warm Period) are inadequate, don't understand all the forcings, and are therefore woefully inadequate for attribution studies (the ones that «tell» us what caused the latest warming).

Science: IPCC models climate without accounting for the known, dominant climate events of the past (e.g., the ice ages, the interglacial epochs, the Medieval Warm Period, the Little Ice Age, sudden changes in the slope of temperature instrument record), and predicting only an unverifiable catastrophe.

The suggestion that recent warming is anthropogenic due to divergence from a simple 60/20 year curve fit over a mere 100 years ignores prior divergence from both competing models of distantly past temperature, one being a hockey stick that shows a slow decline instead of incline prior 1850 and the other showing two similar «non-cyclical» spikes in the Roman and medieval periods.

That conclusion is based not on climate models or recent trends in forest fires, but rather on records of forest fires that occurred more than a millennium ago, during the Medieval Climate Anomaly, a period when global temperatures were comparable to what they are today, and about half a degree warmer (on the Celsius scale) than they had been for several centuries prior.

It seems to me that unless a climate model can both calibrate the Medieval Warm Period and the Little Ice Age and then validate the 20th and 21st Century true (un-manipulated) temperatures using all of the known influencing factors, it can not be claimed that such a model is a representative simulation of earth's climate.