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Ursprungligen postat av hdavidsson
I Nature kan man läsa följande, "
The variations measured from spacecraft since 1978 are too small to have contributed appreciably to accelerated global warming over the past 30 years."
Läs mer på,
http://www.nature.com/nature/journal/v443/n7108/abs/nature05072.html
SUMMARY: But it criticizes the way the controversial climate result was used.
CONTEXT: ...debate for nearly a decade. Now the US National Academy of Sciences (NAS) has weighed in with a report on the hockey-stick plot, which it hopes will finally lay the controversy to rest. The graph purports to chart
Läs mer om Hockeyklubban på Nature,
"Academy affirms hockey-stick graph
Geoff Brumfiel
global temperatures...
Nature 441, 1032 - 1033 (28 Jun 2006) News"
Tyvärr kommer jag inte åt artikeln, men jag tror att alla fattar innebörden.
Det var ju ett lite mer vettig artikel för ovanlighetens skull. Dock undersöker den ju bara direkta luminositetsändringar i solens utstrålade effekt på grund av solfläckar. Alltså en synnerligen begränsad del av de processer solen kan tänkas ha för sig. Det står ju klart och tydligt i artikeln att:
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Additional climate forcing by changes in the Sun’s output of ultraviolet light, and of magnetized plasmas, cannot be ruled out. The suggested mechanisms are, however, too complex to evaluate
meaningfully at present....
Samt senare ser man detta:
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Evidence for the influence of the Sun on climate has recently been
extended by a millennial-scale correlation found between North Atlantic climate (inferred from the properties of deep sea sediments) and solar activity (inferred from 10Be and 14C), extending back about 10,000 years. It remains to be seen whether the correlation is confined to the North Atlantic, or is global.
Dvs att man inte gör något försök att studera andra mekanismer, däribland sådant som Svensmark är inne på. Därtill är det ju spännande med en lokal korrelation som ännu inte undersökts på global skala. Så om du försöker utesluta all inverkan från solen med hjälp av denna artikel så är du sannerligen naiv.
Beträffande Hockey-kurvan så det det du hänvisar till en nyhetsartikel och inte en vetenskaplig artikel. Det kommer ju dock fram till att det var brister i statistikhanteringen:
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The academy essentially upholds Mann's findings, although the panel concluded that systematic uncertainties in climate records from before 1600 were not communicated as clearly as they could have been. The NAS also confirmed some problems with the statistics. But the mistakes had a relatively minor impact on the overall finding, says Peter Bloomfield, a statistician at North Carolina State University in Raleigh, who was involved in the latest report. "This study was the first of its kind, and they had to make choices at various stages about how the data were processed," he says, adding that he "would not be embarrassed" to have been involved in the work.
Panel members were less sanguine, however, about whether the original work should have loomed so large in the executive summary of the IPCC's 2001 report. "The IPCC used it as a visual prominently in the report," says Kurt Cuffey, a panel member and geographer at the University of California, Berkeley. "I think that sent a very misleading message about how resolved this part of the scientific research was."