TY  - GEN
A1  - Rach, Oliver
A1  - Kahmen, Ansgar
A1  - Brauer, Achim
A1  - Sachse, Dirk
T1  - A dual-biomarker approach for quantification of changes in relative humidity from sedimentary lipid D/H ratios
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - Past climatic change can be reconstructed from sedimentary archives by a number of proxies. However, few methods exist to directly estimate hydrological changes and even fewer result in quantitative data, impeding our understanding of the timing, magnitude and mechanisms of hydrological changes.

Here we present a novel approach based on delta H-2 values of sedimentary lipid biomarkers in combination with plant physiological modeling to extract quantitative information on past changes in relative humidity. Our initial application to an annually laminated lacustrine sediment sequence from western Europe deposited during the Younger Dryas cold period revealed relative humidity changes of up to 15% over sub-centennial timescales, leading to major ecosystem changes, in agreement with palynological data from the region. We show that by combining organic geochemical methods and mechanistic plant physiological models on well characterized lacustrine archives it is possible to extract quantitative ecohydrological parameters from sedimentary lipid biomarker delta H-2 data.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 660 
KW  - delta-D values
KW  - hydrogen-isotopic composition
KW  - Dryas cold period
KW  - n-alkanes record
KW  - leaf water
KW  - Younger Dryas
KW  - seasonal variation
KW  - Lake sediments
KW  - Central Europe
KW  - climate varibility
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-418731
SN  - 1866-8372
IS  - 660
ER  -