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Post by byz on Oct 19, 2009 18:49:12 GMT
An interesting article on the BBC! news.bbc.co.uk/earth/hi/earth_news/newsid_8311000/8311373.stmQuotes such as: "As yet, they cannot explain the pattern, but variation in cosmic rays impacted tree growth more than changes in temperature or precipitation." It looks like the BBC is becoming more sceptical wow!! Plus slowly back peddling ;D |
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tsh
Level 2 Rank
Posts: 69
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Post by tsh on Oct 19, 2009 18:52:13 GMT
anyone found a link to the original paper?
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Post by byz on Oct 19, 2009 18:58:45 GMT
Err...No
I only just found the article ;D
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Post by dusty09 on Oct 19, 2009 21:12:13 GMT
Does this mean that tree rings actually reflect the sunspot cycle rather than climate temperature proxies.
If so would this mean that using the tree ring records, potentially someone could create sunspot proxies going back several hundred thousand years?
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Post by northsphinx on Oct 19, 2009 21:20:02 GMT
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Post by northsphinx on Oct 19, 2009 21:26:02 GMT
Does this mean that tree rings actually reflect the sunspot cycle rather than climate temperature proxies. If so would this mean that using the tree ring records, potentially someone could create sunspot proxies going back several hundred thousand years? Yes by measuring carbon-14 dsc.discovery.com/news/briefs/20041025/sunspot.htmlAnd wiki en.wikipedia.org/wiki/Solar_variation"Sunspot numbers over the past 11,400 years have been reconstructed using dendrochronologically dated radiocarbon concentrations. The level of solar activity during the past 70 years is exceptional — the last period of similar magnitude occurred over 8,000 years ago. The Sun was at a similarly high level of magnetic activity for only ~10% of the past 11,400 years, and almost all of the earlier high-activity periods were shorter than the present episode.[21]" www.suite101.com/view_image.cfm/443494www.ncdc.noaa.gov/paleo/pubs/solanki2004/fig3a.jpg |
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Post by radiant on Oct 20, 2009 21:10:41 GMT
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