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Briffa et al (1998) raw data?
Plot of below data: from://www.klimadebat.dk/forum/vedhaeftninger/osborn99.jpg
9154709.txt
From: Tim Osborn <t.osborn@xxxxxxxxx.xxx>
To: mann@xxxxxxxxx.xxx,imacadam@xxxxxxxxx.xxx
Subject: Briffa et al. series for IPCC figure
Date: Tue, 05 Oct 1999 16:18:29 +0100
Cc: k.briffa@uea,p.jones@uea
Dear Mike and Ian
Keith has asked me to send you a timeseries for the IPCC multi-
reconstruction figure, to replace the one you currently have. The data are
attached to this e-
stop the series in 1960 because of the recent non-
is superimposed on the tree-
smoothing through them -
the same filter was used for all curves.
The raw data are the same as used in Briffa et al. (1998), the Nature paper
that I think you have the reference for already. They are analysed in a
different way, to retain the low-
is one-
from Briffa et al. (1998), since the new series is simply a *replacement*
for the one that you have been using, rather than being one-
A new manuscript is in preparation describing this alternative analysis
method, the calibration of the resulting series, and their comparison with
other reconstructions. We are consdering submitting this manuscript to J.
Geophys. Res. when it is ready, but for now it is best cited as:
Briffa KR, Osborn TJ, Schweingruber FH, Harris IC and Jones PD (1999)
Extracting low-
density network. In preparation.
Keith will be sending you a copy of the manuscript when it is nearer to
completion.
I have also attached a PS file showing the original Briffa et al. (1998)
curve, with annotation of cold years associated with known volcanic
eruptions. Overlain on this, you will see a green curve. This is the new
series with a 40-
what it should look like (***ignore the temperature scale on this
figure***, since the baseline is non-
With regard to the baseline, the data I've sent are calibrated over the
period 1881-
all land grid boxes with observed data that are north of 20N. As such, the
mean of our reconstruction over 1881-
target series over the same period. Since the observed series consists of
degrees C anomalies wrt to 1961-
also represents degrees C anomalies wrt to 1961-
shift the mean of our reconstruction so that it matched the observed series
over a different period -
things. Indeed, if the non-
tree-
yield a more biased result than using a longer 1881-
If you have any queries regarding this replacement data, then please e-
me and/or Keith.
Best regards
Tim
Calibrated against observed Apr-
averaged over all land grid boxes north of 20N
Year Reconstructed temperature anomaly (degrees C wrt 1961-
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1478 0.037
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1503 0.011
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1722 0.005
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1803 0.020
1804 0.036
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1846 0.106
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1878 0.120
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1898 0.065
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1930 0.086
1931 0.104
1932 0.081
1933 -
1934 0.007
1935 -
1936 -
1937 0.060
1938 0.163
1939 -
1940 0.113
1941 -
1942 0.128
1943 0.053
1944 -
1945 0.059
1946 -
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1953 0.161
1954 -
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1960 0.076
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Attachment Converted: "c:eudoraattachBriffa et al.ps"
Dr Timothy J Osborn | phone: +44 1603 592089
Senior Research Associate | fax: +44 1603 507784
Climatic Research Unit | e-
School of Environmental Sciences | web-
University of East Anglia __________| http://www.cru.uea.ac.uk/~timo/
Norwich NR4 7TJ | sunclock:
UK | http://www.cru.uea.ac.uk/~timo/sunclock.htm
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