Solar influence on climate during the past millennium


	Solar influence on climate during the past millennium

buches

4-10-2007 7:06 PM

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environment, global warming, climate change, news, politics, sun, science

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/b3ee4746-0069-4f9e-a895-6e30890f7592/BE97B4AF-439B-4837-B0FD-0B19E2A73204/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.pnas.org/cgi/content/full/104/10/3713?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=%22Medieval+Warm+Period%22&searchid=1&FIRSTINDEX=0&sortspec=date&resourcetype=HWCIT" href="http://www.pnas.org/cgi/content/full/104/10/3713?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=%22Medieval+Warm+Period%22&searchid=1&FIRSTINDEX=0&sortspec=date&resourcetype=HWCIT" style="font-size: 11px;">www.pnas.org</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.pnas.org/cgi/content/full/104/10/3713?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=%22Medieval+Warm+Period%22&searchid=1&FIRSTINDEX=0&sortspec=date&resourcetype=HWCIT"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.pnas.org/img/C4E889CA-ED60-4591-A906-C2F103AAF404" alt="Link: PNAS Home" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.pnas.org/cgi/content/full/104/10/3713?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=%22Medieval+Warm+Period%22&searchid=1&FIRSTINDEX=0&sortspec=date&resourcetype=HWCIT"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.pnas.org/img/F56F6A98-104E-445E-80B5-CD45F402CE98" alt="Proceedings of the National Academy of Sciences" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.pnas.org/cgi/content/full/104/10/3713?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=%22Medieval+Warm+Period%22&searchid=1&FIRSTINDEX=0&sortspec=date&resourcetype=HWCIT"><FONT size="-1">PNAS | <B>March 6, 2007</B> | vol. 104 | no. 10 | <B>3713-3718</B>
</FONT></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.pnas.org/cgi/content/full/104/10/3713?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=%22Medieval+Warm+Period%22&searchid=1&FIRSTINDEX=0&sortspec=date&resourcetype=HWCIT">
Solar influence on climate during the past millennium</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.pnas.org/cgi/content/full/104/10/3713?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=%22Medieval+Warm+Period%22&searchid=1&FIRSTINDEX=0&sortspec=date&resourcetype=HWCIT">Smaller, rather than larger,<SUP> </SUP>long-term trends in solar irradiance appear more plausible and<SUP> </SUP>produced modeled climates in better agreement with the range<SUP> </SUP>of Northern Hemisphere temperature proxy records both with respect<SUP> </SUP>to phase and magnitude. Despite the direct response of the model<SUP> </SUP>to solar forcing, even large solar irradiance change combined<SUP> </SUP>with realistic volcanic forcing over past centuries could not<SUP> </SUP>explain the late 20th century warming without inclusion of greenhouse<SUP> </SUP>gas forcing. Although solar and volcanic effects appear to dominate<SUP> </SUP>most of the slow climate variations within the past thousand<SUP> </SUP>years, the impacts of greenhouse gases have dominated since<SUP> </SUP>the second half of the last century.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.pnas.org/cgi/content/full/104/10/3713?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=%22Medieval+Warm+Period%22&searchid=1&FIRSTINDEX=0&sortspec=date&resourcetype=HWCIT">It is important to evaluate comprehensive<SUP> </SUP>models in the preindustrial period when natural variations were<SUP> </SUP>(relatively) pronounced and anthropogenic influences were comparatively<SUP> </SUP>small.</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/BE97B4AF-439B-4837-B0FD-0B19E2A73204/blog/" title="blog or email this clip"><img src="http://content7.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>