Fact-Wegman was not peer reviewed.
Fact: It was not. However, it was not designed to be. It was a report commisioned by the Energy and Commerce Committee because of criticisms of Mann. Dr. Wegman (former Chairmman of National Academy of Sciences and member of the Board of The American Statistical Association) used a panel of experts also consulted with the Board of The American Statistical Association. They found numerous serious flaws in Mann's work.
Fact-You have not cited any research backing Wegmans report.
Not true. I will give previous citations below, but not also this:
"
At the EGU General Assembly a few weeks ago there were no less than three papers from groups in Copenhagen and Bern assessing critically the merits of methods used to reconstruct historical climate variable from proxies; Bürgers papers in 2005; Mobergs paper in Nature in 2005; various papers on borehole temperature; The National Academy of Science Report from 2006 all of which have helped to clarify that the hockey-stick methodologies lead indeed to questionable historical reconstructions. The 4th Assessment Report of the IPCC now presents a whole range of historical reconstructions instead of favoring prematurely just one hypothesis as reliable"
Climate Feedback: The decay of the hockey stick
Previous citations I have given:
Sea surface temperature (SST), salinity, and flux of terrigenous material oscillated on
millennial time scales in the Pleistocene North Atlantic, but there are few records of
Holocene variability. Because of high rates of sediment accumulation, Holocene oscillations are well documented in the northern Sargasso Sea. Results from a radiocarbondated box core show that SST was -1°C cooler than today -400 years ago (the Little Ice Age) and 1 700 years ago, and 1 °C warmer than today 1000 years ago (the Medieval Warm Period). Thus, at least some of the warming since the Little Ice Age appears to be part of a natural oscillation. [emphasis added]
L. Keigwin, The Little Ice Age and Medieval Warm Period in the Sargasso Sea Science 274 (1996): 1503-508.
The reconstruction of global temperatures during the last millennium can provide important clues for how climate may change in the future. A recent, widely cited reconstruction leaves the impression that the 20th century warming was unique during the last millennium. It shows no hint of the Medieval Warm Period (from around 800 to 1200 A.D.) during which the Vikings colonized Greenland, suggesting that this warm event was regional rather than global. It also remains unclear why just at the dawn of the Industrial Revolution and before the emission of substantial amounts of anthropogenic greenhouse gases, Earth's temperature began to rise steeply.
Was it a coincidence? I do not think so. Rather, I suspect that the post-1860 natural warming was the most recent in a series of similar warmings spaced at roughly 1500-year intervals throughout the present interglacial, the Holocene. Bond et al. have argued, on the basis of the ratio of iron-stained to clean grains in ice-rafted debris in North Atlantic sediments, that climatic conditions have oscillated steadily over the past 100,000 years, with an average period close to 1500 years. They also find evidence for the Little Ice Age (from about 1350 to 1860). I agree with the authors that the swing from the Medieval Warm Period to the Little Ice Age was the penultimate of these oscillations and will try to make the case that the Medieval Warm Period was global rather than regional. [emphasis added]
Broecker, Wallace S. Science 23 February 2001:
Vol. 291. no. 5508, pp. 1497 - 1499
DOI: 10.1126/science.291.5508.1497
Osborn and Briffa (Reports, 10 February 2006, p. 841) identified anomalous periods of warmth or cold in the Northern Hemisphere that were synchronous across 14 temperature-sensitive proxies. However, their finding that the spatial extent of 20th-century warming is exceptional ignores the effect of proxy screening on the corresponding significance levels. After appropriate correction, the significance of the 20th-century warming anomaly disappears.
Science 29 June 2007:
Vol. 316. no. 5833, p. 1844
DOI: 10.1126/science.1140982
"The occurrence of the Medieval Warm Period (MWP) in the Southern Hemisphere is uncertain because of the paucity of well-dated, high-resolution paleo-temperature records covering the past 1,000 years. We describe a new tree-ring reconstruction of Austral summer temperatures from the South Island of New Zealand, covering the past 1,100 years. This record is the longest yet produced for New Zealand and shows clear evidence for persistent above-average temperatures within the interval commonly assigned to the MWP. Comparisons with selected temperature proxies from the Northern and Southern Hemispheres confirm that the MWP was highly variable in time and space.
Regardless, the New Zealand temperature reconstruction supports the global occurrence of the MWP."
Cook, E. R., J. G. Palmer, and R. D. D'Arrigo (2002), "Evidence for a Medieval Warm Period in a 1,100 year tree-ring reconstruction of past austral summer temperatures in New Zealand" Geophysical Research Letters, 29(14), 1667
Fact-You have not cited any peer-reviewed research disagreeing with Manns results.
In addition to all of the above, here are two peer-reviewed papers disagreeing with Mann's results:
von Storch, Hans, et al. "Reconstructing Past Climate from Noisy Data." Science; 10/22/2004, Vol. 306 Issue 5696, p679-682
S. McIntyre and R. McKitrick, "Corrections to the Mann et al." Proxy-Data Base and NOrthern Hemispheric Average Tempratures series, 1998,"
Energy & Environment 14 (2003): 751-71.
More recently, we have the following peer-reviewed study, which (although it does not argue that the MWP was as warm as the warmest years in the late 20th century, DOES explicitly contradict Mann's graphy, including the more recent one):
While there are differences among those reconstructions and significant uncertainties remain, all published reconstructions find that temperatures were warm during medieval times, cooled to low values in the 17th, 18th and 19th centuries, and warmed rapidly after that. The medieval level of warmth is uncertain, but may have been reached again in the mid-20th century, only to have likely been exceeded since then.These conclusions are supported by climate modelling as well. Before 2,000 years ago, temperature variations have not been systematically compiled into large-scale averages, but they do not provide evidence for warmer-than-present global annual mean temperatures going back through the Holocene (the last 11,600 years; see Section 6.4). There are strong indications that a warmer climate, with greatly reduced global ice cover and higher sea level, prevailed until around 3 million years ago. Hence, current warmth appears unusual in the context of the past millennia, but not unusual on longer time scales for which changes in tectonic activity (which can drive natural, slow variations in greenhouse gas concentration) become relevant.
Fact-You know so little about this issue that you think it a legitimate point that the graph I have been citing was dropped from IPCC 2007 despite it not being submitted for peer review until eight months after.
I used that fact to back the Wegman review.
Fact-The MWP studies you cite do not disagree or refute Manns work despite your insistence to believe they do.
This simply isn't a fact. Numerous sources cited above disagree with Mann's work (yes, the recent graph) because they DO liken the MWP with the current trend, while Mann's graph does not, and some find it quite possible that MWP reached temperatures as high or higher than the current trend, also denied by Mann's more recent work.
Fact-The only source that did contradict Manns work (and this only his earlier work mind you) was Wegman, whose criticisms were incorporated into the revised work without altering the result.
Again, simply not a fact. See above
Fact-You will now continue to do more dancing.
Right. I have now put several references to various studies all disagreeing with Mann's work, either his previous work, or his latest, or both.