Climate dynamics of the last Millennium derived from cell structure measurements of pine and oak trees in the temperate lowlands of NE-Germany and N-Poland


According to the assessment report of the Intergovernmental Panel on Climate Change (IPCC) global warming is undoubtedly occurring. Moreover, the dynamics of regional and seasonal climate changes will differ significantly. Model comparisons indicate that some parts of the globe and some seasons experience stable or in some cases even declining temperatures. In order to more comprehensively understand such particular regional and seasonal trends, palaeoclimatology directs its attention towards long-term climate reconstructions. Tree-ring based temperature reconstructions form the major part of the data base used for the IPCC report. Temperature reconstructions so far indicated a rise in temperatures during the last decades. One major criticism, however, is that the bulk of the tree-ring chronologies used were from trees growing near the latitudinal or altitudinal limits, e.g., Alpine regions and northern Scandinavia. This is especially true for all tree-ring chronologies longer than 500 years. In contrast, long-term reconstructions derived from trees growing well within their latitudinal or altitudinal limits are missing. Thus, they are not part of the IPCC data base, which we believe is a crucial gap in the palaeoclimate database. For instance, no tree-ring-based temperature reconstructions of millennial scale are available as yet for the temperate lowlands in Europe. Preliminary studies, however, indicate that such reconstructions may reveal long-term trends that substantially differ from those obtained for the high latitudes and altitudes, thus leaving doubts concerning the representativeness of large hemispherical and global reconstructions concerning the temperate lowlands in Europe. This gap in the data base still exists until today because dendroclimatology at temperate lowland sites has been upset for three main reasons, i.e., diffuse climate-growth relationships, only short chronologies because long-living trees were rare and the potential loss of low-frequency signals due to short sample segment lengths. This dilemma can be solved by analysing tree-ring parameters, other than width, e.g., stable isotopes or cell structures, but measuring these parameters is very time-consuming. Recently, we have developed a new method applying confocal laser scanning microscopy which reduces the efforts for obtaining chronologies of cell-structure measurements. First analyses have shown that such chronologies contain strong climate signals indicating the great potential for climate reconstructions for the temperate lowlands in Europe. Therefore, the core objective of this project is to develop multi-centennial chronologies of cell-structure measurements for NE-Germany and N-Poland, which will be utilized for long-term reconstructions. Subsequent analyses will examine the climate dynamics and underlying modes, such as the North Atlantic Oscillation by means of climate simulations.


Principal Investigators
Heinrich, Ingo PD Dr (Details) (Climatology / Vegetationgeography)

Duration of Project
Start date: 10/2014
End date: 03/2017

Research Areas
Geography

Research Areas
Geographie, Klimawandel

Publications
Pritzkow, C., Wazny, T., Heussner, K.‐U., Słowiński, M., Bieber, A., Dorado Liñán, I., Helle, G., Heinrich, I. (2016): Minimum winter temperature reconstruction from average earlywood vessel area of European oak (Quercus robur) in N‐Poland. Palaeogeography, Palaeoclimatology, Palaeoecology 449, 520‐530, doi:10.1016/j.palaeo.2016.02.046.

Siegmund, J. F., Sanders, T. G. M., Heinrich, I., van der Maaten, E., Simard, S., Helle, G., Donner, R. V. (2016): Meteorological Drivers of Extremes in Daily Stem Radius Variations of Beech, Oak, and Pine in Northeastern Germany: An Event Coincidence Analysis. - Frontiers in Plant Science, 7. DOI: http://doi.org/10.3389/fpls.2016.00733

Scharnweber T., Couwenberg J., Heinrich I., Wilmking M. (2016): New insights for the interpretation of ancient bog oak chronologies? Reactions of oak (Quercus robur L.) to a sudden peatland rewetting. Palaeogeography, Palaeoclimatology, Palaeoecology 417, 534-543.

Pieper H., Heinrich I., Heußner K.U., Helle G. (2016): The influence of volcanic eruptions on growth of central European lowland trees in NE-Germany during the last Millennium. Palaeogeography, Palaeoclimatology, Palaeoecology 411, 155-166.

Last updated on 2021-08-01 at 15:42