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Post by cuttydyer on Jul 23, 2013 9:36:12 GMT
The Schtick reports: Review finds the Medieval Warm Period was global & generally warmer than the present. A new paper from SPPI & CO2 Science reviews evidence of the Medieval Warm Period in the southern portion of North America, and finds "the studies herein reviewed clearly demonstrate the existence of a Medieval Warm Period far removed from the stomping grounds of the Nordic Vikings, while simultaneously helping to debunk the climate-alarmist claim that the MWP was a minor non-global phenomenon. Quite to the contrary, the MWP was truly global in extent, as demonstrated by data obtained on all of earth's continents; and it was characterized by temperatures that were generally higher than those of the recent past and present. And it did so in an atmosphere with a CO2 concentration on the order of only 285 ppm, as compared to the 400 ppm of today." Excerpts: Climate alarmists claim that rising atmospheric CO2 concentrations due to the burning of fossil fuels - such as coal, gas and oil - have raised global air temperatures to their highest level in the past one to two millennia. And, therefore, investigating the possibility of the existence of a period of equal or greater global warmth within the past one to two thousand years has become a high-priority enterprise; for if such a period could be shown to have existed at times when the atmosphere's CO2 concentration was far less than it is today, there would be no compelling reason to attribute the warmth of our day to the CO2 released to the air by mankind's burning of the fossil fuels that supplied the power that sustained the Industrial Revolution. Therefore, in this review of the pertinent scientific literature, results of the search for such knowledge are presented for studies conducted within North American countries located south of the southern border of the United States. Focusing on the North American countries located south of the United States southern border, the studies herein reviewed clearly demonstrate the existence of a Medieval Warm Period far removed from the stomping grounds of the Nordic Vikings, while simultaneously helping to debunk the climate-alarmist claim that the MWP was a minor non-global phenomenon. Quite to the contrary, the MWP was truly global in extent, as demonstrated by data obtained on all of earth's continents; and it was characterized by temperatures that were generally higher than those of the recent past and present. And it did so in an atmosphere with a CO2 concentration on the order of only 285 ppm, as compared to the 400 ppm of today. Review link: scienceandpublicpolicy.org/images/stories/papers/originals/evidence_mwp_namerica.pdfSchtick link: hockeyschtick.blogspot.co.uk/2013/07/review-finds-medieval-warm-period-was.html
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Post by sigurdur on Jul 24, 2013 0:02:29 GMT
This should come as no surprise to anyone. The MWP is very pronounced in NA, one would expect Central American to be affected as well. There is also ample proxy data showing South America was affected.
Only in Australia was there no MWP.......or so John Cook says.
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Post by cuttydyer on Aug 28, 2013 12:13:35 GMT
Retreating Glacier In Patagonia Uncovers 400 Year Old Forest: Paper pdf link: www.clim-past.net/8/403/2012/cp-8-403-2012.pdfLittle Ice Age Advance and Retreat of Glaciar Jorge Montt, Chilean Patagonia. By A Rivera et al. ABSTRACT Glaciar Jorge Montt, one of the main tidewater glaciers of the Southern Patagonian Icefield (SPI), has experienced the greatest terminal retreat observed in Patagonia during the past century, with a recession of 19.5 km between 1898 and 2011. This retreat has revealed trees laying subglacially until 2003. These trees were dated using radiocarbon, yielding burial ages between 460 and 250 cal yrs BP. The presence of old growth forest during those dates indicates that Glaciar Jorge Montt was upvalley of its present position before the commonly recognized Little Ice Age (LIA) period in Patagonia. The post-LIA retreat was most likely triggered by climatically induced changes during the 20th century; however, Glaciar Jorge Montt has responded more dramatically than its neighbours. The retreat of Jorge Montt opened a 19.5 km long fjord since 1898, which reaches depths in excess of 390 m. As the photo above makes clear, the tree remains were found right at the edge of where the glacier stood as recently as 2010. For trees to grow in this position, it is likely that the edge of the glacier at the time was a distance uphill of its present position. It seems also extremely unlikely that these are the only tree remains under the present glacier, and that many more will be revealed as/if the glacier continues to retreat. Lonnie Thompson, for instance, finds that, on the Quelccaya Glacier in Peru, temperatures peaked in the 14thC, two centuries before these trees were growing. One other interesting comment made in the study:- “During the LIA the glacier advanced to most likely stabilize at the 1898 position” As we find elsewhere, glaciers were reaching their maximums just at the time we started studying them. Paul's Footnote: There is plenty of evidence throughout South America of a Little Ice Age, preceded by a Medieval Warming Period that may have been warmer than the current period. Link: notalotofpeopleknowthat.wordpress.com/2013/08/27/retreating-glacier-in-patagonia-uncovers-400-year-old-forest/
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Post by sigurdur on Aug 28, 2013 14:13:44 GMT
Only the people in denial can claim that the MWP was not worldwide. Not only is there evidence locally, but the Sargasso Sea proxy data, which show ocean temp in an extremely wide are, show the MWP.
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Post by icefisher on Aug 28, 2013 15:54:16 GMT
Only the people in denial can claim that the MWP was not worldwide. Not only is there evidence locally, but the Sargasso Sea proxy data, which show ocean temp in an extremely wide are, show the MWP. bbbbbbbb but statistic expert M Mann found at least two trees. . . . .
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Post by sigurdur on Aug 28, 2013 18:53:48 GMT
Only the people in denial can claim that the MWP was not worldwide. Not only is there evidence locally, but the Sargasso Sea proxy data, which show ocean temp in an extremely wide are, show the MWP. bbbbbbbb but statistic expert M Mann found at least two trees. . . . . Mike tried to find something that just wasn't there. And it is really no big deal, except that using hindcast, the models can't deal with it. Which again, shows that the models need work. I don't understand why anyone can't see that.....heck.......even a buffoon could see that.
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Post by cuttydyer on Oct 1, 2013 13:59:53 GMT
Temperature reconstructions from eastern Mediterranean tree ring samples identify the medieval warm period and the little ice age, but fail to identify the twentieth century warming trend, nor was it found in the corresponding meteorological data used for the study. Paper link: link.springer.com/static-content/lookinside/231/art%253A10.1007%252Fs00382-013-1702-3/000.pngAbstract In the eastern Mediterranean in general and in Turkey in particular, temperature reconstructions based on tree rings have not been achieved so far. Furthermore, centennial-long chronologies of stable isotopes are generally also missing. Recent studies have identified the tree species Juniperus excelsa as one of the most promising tree species in Turkey for developing long climate sensitive stable carbon isotope chronologies because this species is long-living and thus has the ability to capture low-frequency climate signals. We were able to develop a statistically robust, precisely dated and annually resolved chronology back to AD 1125. We proved that variability of ?13C in tree rings of J. excelsa is mainly dependent on winter-to-spring temperatures (January–May). Low-frequency trends, which were associated with the medieval warm period and the little ice age, were identified in the winter-to-spring temperature reconstruction, however, the twentieth century warming trend found elsewhere could not be identified in our proxy record, nor was it found in the corresponding meteorological data used for our study. Comparisons with other northern-hemispherical proxy data showed that similar low-frequency signals are present until the beginning of the twentieth century when the other proxies derived from further north indicate a significant warming while the winter-to-spring temperature proxy from SW-Turkey does not. Correlation analyses including our temperature reconstruction and seven well-known climate indices suggest that various atmospheric oscillation patterns are capable of influencing the temperature variations in SW-Turkey. _________________________________________________________ Steven Goddard reports: "IPCC Officially Erases The MWP"IPCC participant Jay Overpeck said in his email to Professor Deming, “We have to get rid of the Medieval Warm Period.”They have done just that, and renamed it the Medieval Climate Anomaly New paleoclimate reconstruction efforts since AR4 (Figure 5.7; Table 5.4; Table 5.A.1) have provided further insights into the characteristics of the Medieval Climate Anomaly (MCA; Table 5.1) almost all reconstructions agree that each 30-year (50-year) period from 1200 to 1899 was very likely colder in the NH than the 1983–2012 (1963–2012) instrumental temperature. Link: www.climatechange2013.org/images/uploads/WGIAR5_WGI-12Doc2b_FinalDraft_Chapter05.pdf
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Post by sigurdur on Nov 1, 2013 2:41:57 GMT
OH crap.....the oceans had more heat than we thought. The temps are rising.......through alllllll that cold upper layer. It is a miracle.......a true miracle I say..... But hark........what is this? ?.........There has been more heat content in the past? Tell me it ain't so Joe...... Observed increases in ocean heat content (OHC) and temperature are robust indicators of global warming during the past several decades. We used high-resolution proxy records from sediment cores to extend these observations in the Pacific 10,000 years beyond the instrumental record. We show that water masses linked to North Pacific and Antarctic intermediate waters were warmer by 2.1 ± 0.4°C and 1.5 ± 0.4°C, respectively, during the middle Holocene Thermal Maximum than over the past century. Both water masses were ~0.9°C warmer during the Medieval Warm period than during the Little Ice Age and ~0.65° warmer than in recent decades. Although documented changes in global surface temperatures during the Holocene and Common era are relatively small, the concomitant changes in OHC are large. www.sciencemag.org/content/342/6158/617
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Post by sigurdur on Nov 1, 2013 3:32:48 GMT
What we have above confirms what Keigwin found in the Sargasso Sea. Another area of converging currents reflecting a wide area of ocean.
Keigwin, L.D. 1996. The Little Ice Age and Medieval Warm Period in the Sargasso Sea. Science 274: 1504-1508.
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Post by Andrew on Nov 1, 2013 6:11:42 GMT
What we have above confirms what Keigwin found in the Sargasso Sea. Another area of converging currents reflecting a wide area of ocean. Keigwin, L.D. 1996. The Little Ice Age and Medieval Warm Period in the Sargasso Sea. Science 274: 1504-1508. Sigurdur, I find it amazing that you spend so much time reading all of these papers and yet you refuse to take the opportunity to learn about some of the underlying scientific ideas that you pretend to know so much about. I was just reading thru those comments you made about your claimed 50% reduction in the Greenhouse effect at 5000m due to the Earths geometry, and your comment that you know that your 'PhD in physics buddy' has a meaningless qualification but 'you know'. It is fairly jaw dropping stuff coming from you sometimes, and as I said before must drive him totally nuts with frustration. Fairly obviously you begin with the results you want and then work backwards to create the ideas you need.
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Post by sigurdur on Nov 1, 2013 11:50:08 GMT
Andrew: Do you agree that the evidence is overwhelming showing the MWP was a world event?
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Post by Andrew on Nov 1, 2013 16:53:06 GMT
Andrew: Do you agree that the evidence is overwhelming showing the MWP was a world event? Overwhelming evidence is a very strong expression. I can smell a rat but how would somebody like me be in a position to know with such certainty what was happening all around the world 1000 years ago? The point i was making is that you are reading a large number of papers and yet your fundamental approach is not scientific
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Post by duwayne on Nov 1, 2013 17:31:57 GMT
What we have above confirms what Keigwin found in the Sargasso Sea. Another area of converging currents reflecting a wide area of ocean. Keigwin, L.D. 1996. The Little Ice Age and Medieval Warm Period in the Sargasso Sea. Science 274: 1504-1508. Sigurdur, I find it amazing that you spend so much time reading all of these papers and yet you refuse to take the opportunity to learn about some of the underlying scientific ideas that you pretend to know so much about. I was just reading thru those comments you made about your claimed 50% reduction in the Greenhouse effect at 5000m due to the Earths geometry, and your comment that you know that your 'PhD in physics buddy' has a meaningless qualification but 'you know'. It is fairly jaw dropping stuff coming from you sometimes, and as I said before must drive him totally nuts with frustration. Fairly obviously you begin with the results you want and then work backwards to create the ideas you need. Andrew, with your in depth knowledge of the science, what is your prediction for global warming?
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Post by duwayne on Nov 1, 2013 18:16:39 GMT
Post moved to the "Climate Warming Prediction" thread which is where I had intended to place it.
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Post by Andrew on Nov 1, 2013 19:52:57 GMT
Andrew, with your in depth knowledge of the science, what is your prediction for global warming? The short answer is I dont have any strong views either way for the direction of temperature change.
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