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Low-frequency Temperature Variations from a Northern Tree Ring Density Network
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Low-frequency Temperature Variations from a Northern Tree Ring Density Network
Journal of Geophysical Research, 106 D3 (16-Feb-2001) pp. 2929-2941 K. R. Briffa*, T. J. Osborn, F.H. Schweingruber,
I.C. Harris, P. D. Jones, S.G. Shiyatov, and E.A. Vaganov.
*Climatic Research Unit, University of East Anglia, Norwich NR4 7TJ, UK.
*To whom correspondence should be addressed. |
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ABSTRACT: |
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Plate 2. Reconstructions of nine regional April-September temperature series, all with decadal smoothing. Observed temperatures are shown in red, Hugershoff-standardized reconstructions are shown in dark blue, age-banded reconstructions are shown in black (with 1 and 2 sigma errors indicated by the yellow and orange shading). The vertical red lines in some reconstructions indicate how far back the age-banded reconstructions are considered to be reliable (see text for further details). Download the data from this figure and data description from the WDC Paleo archive. |
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Plate 3. Comparison of six large-scale reconstructions, all recalibrated with linear regression against the 1881-1960 mean April-September observed temperature averaged over land areas north of 20N. All series have been smoothed with a 50-year Gaussian-weighted filter and are anomalies from 1961-1990 mean. Observed temperature for 1871-1997 (black) from Jones et al. (1999); circum-Arctic temperature proxies for 1600-1990 (yellow) from Overpeck et al.(1997); northern hemisphere temperature proxies for 1000-1980(red) from Jones et al. (1998); global temperature and non-temperature proxies for 1000-1980 (purple) from Mann et al. (1998, 1999); and three northern Eurasian tree ring width chronologies for 1000-1987 (green) from Briffa and Osborn (1999); 13 Northern Hemisphere temperature proxies for 1000-1987 (orange) from Crowley and Lowery (2000), but excluding the two low-resolution records used by them; and the NH reconstruction from the age-banded analysis presented in this study for 1402-1960 (blue), bounded by the 1 and 2 sigma standard errors. Download the data from this figure and data description from the WDC Paleo archive. |
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To read or view the full study, please visit the AGU website. It was published in Journal of Geophysical Research 106 D3 (16-Feb-2001) 2929-2941. |
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