Re: [pf] Fwd: Climate to be privatised in November

· If you regard my note below as too messy or confusing, for some
perspective on the "Medieval Warm Period" just look at the 1000year
temperature graph on:
http://davd.tripod.com/nhemmill.gif
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At 10:44 27/9/2000 -0700, Molly Wms. wrote:
> ... can you provide a link to info on the Medieval Warm Period?
>
>On Sept 02, 16:59 -0700, I (David Mac) wrote, with Subject:
"The warmth is global and cannot be explained by natural forcing mechanisms"
 (My letter is also at:
http://csf.colorado.edu/mail/pfvs/2000/msg04618.html ) :-

>  The new website in NGDC's Paleo Perspectives series
>  follows the successful "A Paleo Perspective on Global Warming":
http://www.ngdc.noaa.gov/paleo/globalwarming/home.html .
>_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
>
>**  This last leads to:
>
>http://www.ngdc.noaa.gov/paleo/globalwarming/paleobefore.html
>  which has (the arrow-headed lines):
>
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>Several periods of warmth (listed below) have been hypothesized to have
>occurred in the past. ...
>
>(1)   The so-called "Medieval Warm Period" (ca. 9th to 14th centuries)
http://www.ngdc.noaa.gov/paleo/globalwarming/medieval.html
·  which has a small version of the very instructive graph of temperatures
over the last 1000 years, from tree rings and ice cores (I believe):

http://davd.tripod.com/nhemmill.gif
·  which I extracted from:
http://www.ngdc.noaa.gov/paleo/pubs/millennium-camera.pdf ,
·  linked-to from:
http://www.ngdc.noaa.gov/paleo/pubs/mann_99.html
·  which starts:
Abstract:
 Building on recent studies, we attempt northern-hemispheric temperature
reconstructions with proxy data networks for the past millennium. We focus
not just on the reconstructions, but the uncertainties therein, and
important caveats. Though expanded uncertainties prevent decisive
conclusions for the period prior to AD 1400, our results suggest that the
latter 20th-century is anomalous in the context of at least the past
millennium. ... The 20th century warming counters a millennial-scale
cooling trend which is consistent with long-term astronomical forcing. [not
sure: the earth moving away from the Sun]

>(2)   The so-called mid-Holocene "Warm Period" (ca. 6,000 years ago)
>http://www.ngdc.noaa.gov/paleo/globalwarming/holocene.html
>
>(3)   The penultimate interglacial period (ca. 125,000 years ago)
>http://www.ngdc.noaa.gov/paleo/globalwarming/interglacial.html
>
>(4)   The mid-Cretaceous Period (era?) (ca. 120-90 million years ago)
>http://www.ngdc.noaa.gov/paleo/globalwarming/cretaceous.html
>
> The latest peer-reviewed paleoclimatic studies appear to confirm that the
>global warmth of the 20th century may not necessarily be the warmest time
>in Earth's history, what is unique is that the warmth is global and cannot
>be explained by natural forcing mechanisms.
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>
>sent on by David.
(David MacClement) davd@ihug.co.nz 
http://www.emucities.com.au/member/davd/index.html
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