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| Titel |
Climate reconstructions from tree-ring widths for the last 850 years in Northern Poland |
| VerfasserIn |
Ingo Heinrich, Antje Knorr, Karl-Uwe Heußner, Tomasz Wazny, Michał Słowiński, Gerhard Helle, Sonia Simard, Tobias Scharnweber, Allan Buras, Wolfgang Beck, Martin Wilmking, Achim Brauer |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250102482
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| Publikation (Nr.) |
 EGU/EGU2015-1806.pdf |
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| Zusammenfassung |
| Tree-ring based temperature reconstructions form the scientific backbone of the current
debate over global change, and they are the major part of the palaeo data base used for the
IPCC report. However, long temperature reconstructions derived from temperate lowland
trees growing well within their distributional limits in central Europe are not part of the
IPCC report, which is an essential gap in the international data base. It appears that
dendroclimatological analysis at temperate lowland sites was so far difficult to
perform mainly for three reasons: diffuse climate-growth relationships, the lack of
long chronologies due to absence of sufficient numbers of long-living trees and
the potential loss of low-frequency signals due to the short length of the sample
segments.
We present two robust multi-centennial reconstructions of winter temperatures
and summer precipitation based on pine and oak tree-ring widths chronologies
from northern Poland, where so far no long tree-ring based reconstructions were
available. We compared the new records with global, hemispherical and regional
reconstructions, and found good agreement with some of them. In comparison, the winter
temperature of our reconstruction, however, did not indicate any modern warming
nor did the summer precipitation reconstruction suggest any modern 20th century
changes.
In a second step, we measured cell structures and developed chronologies of
parameters such as cell wall thickness and cell lumen area. We used our new method
(Liang et al. 2013a,b) applying confocal laser scanning microscopy to increment core
surfaces for efficient histometric analyses. We focused on samples covering the
last century because meteorological data necessary for calibration studies were
available for direct comparisons. It was demonstrated that the correlations with climate
were strong and different from those found for tree-ring widths (e.g., N-Poland
oak-vessel-lumen-area-chronology with previous September-to-December mean temperature
r = 0,61 and N-Poland pine-tracheid-lumen-area-chronology with mean Feb-to-June
temperature r = -0,66). By using only raw values, low-frequency signals could be sustained in
the chronologies.
Liang, W.; Heinrich, I.; Helle, G.; Dorado Liñán, I.; Heinken, T. (2013a): Applying
CLSM to increment core surfaces for histometric analyses: A novel advance in quantitative
wood anatomy. Dendrochronologia 31, 140-145.
Liang, W.; Heinrich, I.; Simard, S.; Helle, G.; Dorado Liñán, I.; Heinken, T. (2013b):
Climate signals derived from cell anatomy of Scots pine in NE Germany. Tree Physiology 33,
833-844. |
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