Environmental Engineering Reference
In-Depth Information
0.4
-0.0
-0.4
-0.8
-1.2
Year
Borehole temperatures (Huang
et al
. 2000)
Multiproxy (Mann and Jones 2003)
Multiproxy (Hegerl
et al
. 2006)
Instrumental record (HadCRUT2v)
Glacier lengths (Oerlemans
et al
. 2005)
Multiproxy (Moberg
et al
. 2005)
Tree rings (Esper
et al
. 2002)
Proxy and instrument data from the NAS Report. NAS
analysis of temperature for the past
fig. 4.4
years from six proxies (the
reference citations are those in the original report). The heavy, black line
is from the instrument record. (Reprinted with permission from Surface
Temperature Reconstructions for the Last
National
Research Council. Courtesy of the National Academy Press,
Washington, DC.
www.nap.edu/catalog/
Years,©
.html
Figure S-
)
climate
s natural variability. The National Academy of
Sciences (NAS) put together a panel to examine the issue.
Their report showed a much larger variability from the
proxies than had been claimed by some. It contains a
detailed analysis of how the past temperature can be
reconstructed from a multitude of proxies.
Results from the National Academy analysis are shown
in
Figure
'
.
. We are interested in average temperatures
