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Seasonal Reconstruction of Summer
Precipitation Variability and Dating
of Flood Events for the Millennium
Between 3250 and 2250 Years BC
for the Main Region, Southern Germany
Johannes Schoenbein, Alexander Land, Michael Friedrich,
diger Glaser and Manfred Kueppers
Abstract We present a millennial-long reconstruction of summer precipitation
variability for the Main region (MR) in southern Germany (3250 BC to 2250 BC)
based on subfossil-oak, tree-ring data. Wood-anatomical
ood markers have been
flood events providing additional information of
hydro-climatic dynamics. Reconstructed precipitation variability and
ed and used for dating
ood occur-
rence show a noticeable shift which coincides with a decrease in replication
(number of trees) of the Holocene Oak Chronology (HOC) Hohenheim around
2750 BC. The reconstruction is based on a linear climate-growth model derived
from total ring width (TRW) data from living oak trees from the MR using the past
approximately 130 years as a basis. The best response was identi
ed for the pre-
cipitation sum between April 1st and July 10th providing an r 2 = 0.31.
Keywords Tree rings
Southern Germany
Holocene Oak Chronology (HOC)
Precipitation variability
Flood frequency
1 Introduction
Studies on hydro-climatic variability had been secondary to those studying past
temperature variability (Wilson et al. 2013 ). However ambitious efforts were
undertaken to reconstruct past hydro-climatic conditions (e.g. Buentgen et al. 2011 ;
Drobyshev et al. 2011 ; Wilson et al. 2013 ). Derived from the original idea to
combine the Holocene Oak Chronology (HOC) with documentary data to provide
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