date: Mon, 05 Jul 1999 10:55:43 +0200 from: Christof Appenzeller subject: Re: Your NAO reconstruction to: Tim Osborn , christof@climate.unibe.ch Dear Tim good to hear from you. I have attached two files. One file with the filtered data (a 1 2 3 2 1 filter) in order to remove the timing uncertainty of the ice accumulation data as described in the Science paper (see footnote) and a second file containing the raw data (not yet scaled with -1). I hope you can read it. What the comparison is concerned (the one I have presented at the EGS). I have looked to 3 instrumental and 4(5) proxy indices and low passed filtered the data in order to get the long term variability. I have not yet written up the result but overall they are rather disappointing. I did not found significant correlation for a really independent time interval (with one exception but I guess that both indices use a common data set). I will send you a preprint as soon as I have written it up. In De Bilt you told me that it might be possible to use your NH tree ring data set. If so, I would very much appreciate if you could send me the data. Hope everything is fine. I will be at the ECMWF Reanalysis conference. Might be I will see you there. Regards Christof Tim Osborn wrote: > > Dear Christof and Tom > > Keith Briffa and I are putting together a poster on the NAO that will be > shown at the INQUA conference in Durban next month, and hoped to include > some examples of reconstructions based on paleodata. Would it be possible > to include your series (as published in Science last year)? If so, then > I'd be grateful for the data so that I can re-plot it in the same format as > the others that we're showing (Cook et al., Stockton & Glueck, and Mann et > al.). > > Also, I remember Christof telling me that he was presenting some results of > a comparison of the various reconstructions at this years EGS. Is a > manuscript available containing these results? If so, then how should I > cite it and could I have a copy? > > Best regards to you both, > > Tim > > Dr Timothy J Osborn | phone: +44 1603 592089 > Senior Research Associate | fax: +44 1603 507784 > Climatic Research Unit | e-mail: t.osborn@uea.ac.uk > School of Environmental Sciences | web-site: > 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 -- Dr. Christof Appenzeller Tel. (031) 631 48 71 Climate and Environmental Physics Fax. (031) 631 44 05 University of Bern Sidlerstrasse 5 christof.appenzeller@climate.unibe.ch CH-3012 Bern Switzerland http://www.climate.unibe.ch/~christof/ Data: ===== Annual proxy NAO index based on ice accumulation rates measured on the western Greenland ice core (NASAU) as described in 'Appenzeller et al., 1998, North Atlantic Oscillation Dynamics Recorded in Greenland Ice Cores, Science, 282,446-449. The normalized index is an annual mean averaged from spring. A weak linear trend and the high frequency parts is removed (using a standard 5 point triangular filter with weights 1, 2, 3, 2,1). See paper for details. Also included is the measured normalized annual mean NAO index (again averaged from spring to spring, linear tend and high frequency part removed) defined as the normalized pressure difference between Stykkisholmur, Iceland, and Ponta Delgada, Azores as given in Hurrell, 1995. Correspondence: =============== Christof Appenzeller, Climate and Environmental Physics , University of Bern, Sidlerstrasse 5 CH-3012 Bern Switzerland e-mail: christof@climate.unibe.ch References: =========== Appenzeller, C., T. F. Stocker, and M. Anklin, North Atlantic Oscillation Dynamics Recorded in Greenland Ice Cores, Science, 282, 446-449, 1998. http://www.climate.unibe.ch/~christof/paper_ps/recnao_abstract.html Appenzeller, C., J. Schwander, S. Sommer, and T. F. Stocker, The North Atlantic Oscillation and its Imprint on Precipitation and Ice Accumulation in Greenland., Geophys. Res. Lett., 25, 1939-1942, 1998. http://www.climate.unibe.ch/~christof/paper_ps/naoice_abstract.html Anklin, M., R. C. Bales, E. Mosley-Thompson, and K. Steffen, Annual accumulation at two sites in northwest Greenland during recent centuries, J. Geophys. Res., in press, 1998. =========================================================================== total number of data: 344 year proxy_nao instrumental_nao =========================================================================== 1648.00, -0.804702, 0.00000 1649.00, 0.396990, 0.00000 1650.00, 0.909540, 0.00000 1651.00, 1.06591, 0.00000 1652.00, 1.23005, 0.00000 1653.00, 1.08711, 0.00000 1654.00, 0.472884, 0.00000 1655.00, -0.452132, 0.00000 1656.00, -0.911883, 0.00000 1657.00, -0.658510, 0.00000 1658.00, -0.805092, 0.00000 1659.00, 0.199263, 0.00000 1660.00, 0.315278, 0.00000 1661.00, 0.783925, 0.00000 1662.00, 0.0497661, 0.00000 1663.00, 0.00856637, 0.00000 1664.00, 0.357353, 0.00000 1665.00, 0.840519, 0.00000 1666.00, 0.782815, 0.00000 1667.00, 0.131849, 0.00000 1668.00, -0.173891, 0.00000 1669.00, -0.0208273, 0.00000 1670.00, 0.639471, 0.00000 1671.00, 0.0967230, 0.00000 1672.00, -0.246307, 0.00000 1673.00, -0.790903, 0.00000 1674.00, 0.175650, 0.00000 1675.00, 0.754624, 0.00000 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-1.09901 1963.00, -1.06713, -1.22274 1964.00, -1.03915, -1.10373 1965.00, -1.03291, -0.543045 1966.00, -0.965413, -0.805014 1967.00, -1.32962, -1.14790 1968.00, -0.990365, -1.93246 1969.00, -0.205738, -1.24703 1970.00, 0.987013, -0.325586 1971.00, 1.53803, 0.727343 1972.00, 1.23185, 1.04528 1973.00, 0.282250, 0.928284 1974.00, -1.17849, 0.470766 1975.00, -1.77791, -0.249731 1976.00, -1.69814, -1.11858 1977.00, -0.499247, -1.21871 1978.00, -0.288703, -1.23793 1979.00, -0.0862190, -0.737933 1980.00, -0.300671, -0.403141 1981.00, 0.625408, 0.181145 1982.00, 1.09333, 0.576625 1983.00, 1.34328, 0.311284 1984.00, 0.876645, -0.0686887 1985.00, 0.690357, -0.630724 1986.00, 0.516881, -0.474623 1987.00, 0.976108, -0.190404 1988.00, 0.942998, 0.582688 1989.00, 0.953551, 1.09617 1990.00, 0.305438, 1.62651 1991.00, 0.530749, 1.88376 Raw data for proxy NAO index based on ice accumulation rates (Appenzeller et al., 1998, North Atlantic Oscillation Dynamics Recorded in Greenland Ice Cores, Science, 282, 446-449. This data can not be used as they are (see footnote on signal to noise ratio ! ) This data are not public available please contact Christof Appenzeller e-mail:christof@climate.unibe.ch 1645.00, -0.129719, 1646.00, 0.162970, 1647.00, 1.41912, 1648.00, 0.454417, 1649.00, -1.36531, 1650.00, -0.538706, 1651.00, -0.528213, 1652.00, -0.324513, 1653.00, -1.16871, 1654.00, -1.53984, 1655.00, 1.86109, 1656.00, -0.0418059, 1657.00, -1.39285, 1658.00, 2.31221, 1659.00, -1.57339, 1660.00, 0.245149, 1661.00, -1.52728, 1662.00, 0.206694, 1663.00, 0.568562, 1664.00, -0.882794, 1665.00, -0.596527, 1666.00, -0.561865, 1667.00, -0.739267, 1668.00, 0.616579, 1669.00, 0.519348, 1670.00, -1.88272, 1671.00, 0.119291, 1672.00, -0.290372, 1673.00, 1.45871, 1674.00, -1.12253, 1675.00, -0.348671, 1676.00, -0.833325, 1677.00, -0.919486, 1678.00, 3.06852, 1679.00, -0.471301, 1680.00, 1.01466, 1681.00, -0.605156, 1682.00, 0.473539, 1683.00, 0.843405, 1684.00, -0.655835, 1685.00, 0.227890, 1686.00, -0.159379, 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