arrest the crimatologists
Posts tagged medieval warm period
Climatic signals in multiple highly resolved stable isotope records from Greenland
Mar 16th
via CO2 Science
Reference
Vinther, B.M., Jones, P.D., Briffa, K.R., Clausen, H.B., Andersen, K.K., Dahl-Jensen, D. and Johnsen, S.J. 2010. Climatic signals in multiple highly resolved stable isotope records from Greenland. Quaternary Science Reviews 29: 522-538.
Description
Working with 20 ice core records from 14 different sites, all of which stretched at least 200 years back in time, as well as near-surface air temperature data from 13 locations along the southern and western coasts of Greenland that covered approximately the same time interval (1784-2005), plus a similar temperature data set from northwest Iceland (said by the authors to be employed “in order to have some data indicative of climate east of the Greenland ice sheet”), Vinther et al. proceeded to demonstrate that winter δ18O was “the best proxy for Greenland temperatures.” Then, based on that determination and working with three longer ice core δ18O records (DYE-3, Crete and GRIP), they developed a temperature history that extended more than 1400 years back in time. In describing this record, the seven scientists said that “temperatures during the warmest intervals of the Medieval Warm Period,” which they defined as occurring “some 900 to 1300 years ago, “were as warm as or slightly warmer than present day Greenland temperatures [italics added].” Hence, we conclude that for southwest Greenland, various portions of the MWP (AD 700-1100) were warmer than they have been over the last several years.
Phil Jones U-Turn: There has been no global warming since 1995
Feb 13th
The Daily Mail
February 14 2010
- Data for vital ‘hockey stick graph’ has gone missing
- There has been no global warming since 1995
- Warming periods have happened before – but NOT due to man-made changes
Data: Professor Phil Jones admitted his record keeping is ‘not as good as it should be’The academic at the centre of the ‘Climategate’ affair, whose raw data is crucial to the theory of climate change, has admitted that he has trouble ‘keeping track’ of the information.
Colleagues say that the reason Professor Phil Jones has refused Freedom of Information requests is that he may have actually lost the relevant papers.
Professor Jones told the BBC yesterday there was truth in the observations of colleagues that he lacked organisational skills, that his office was swamped with piles of paper and that his record keeping is ‘not as good as it should be’.
The data is crucial to the famous ‘hockey stick graph’ used by climate change advocates to support the theory.
Professor Jones also conceded the possibility that the world was warmer in medieval times than now – suggesting global warming may not be a man-made phenomenon.
And he said that for the past 15 years there has been no ‘statistically significant’ warming.
The admissions will be seized on by sceptics as fresh evidence that there are serious flaws at the heart of the science of climate change and the orthodoxy that recent rises in temperature are largely man-made.
BBC News – Climate data ‘not well organised’
Feb 12th
BBC News
February 12 2010
Phil Jones, the professor behind the “Climategate” affair, has admitted some of his decades-old weather data was not well enough organised.
He said this contributed to his refusal to share raw data with critics – a decision he says he regretted.
But Professor Jones said he had not cheated the data, or unfairly influenced the scientific process.
He said he stood by the view that recent climate warming was most likely predominantly man-made.
But he agreed that two periods in recent times had experienced similar warming. And he agreed that the debate had not been settled over whether the Medieval Warm Period was warmer than the current period.
These statements are likely to be welcomed by people sceptical of man-made climate change who have felt insulted to be labelled by government ministers as flat-earthers and deniers.
Most recent comments