Measurements and applications of δ2H values of wood lignin methoxy groups for paleoclimatic studies

Stable hydrogen isotope values of wood lignin methoxy groups (delta H-2(LM)) are increasingly applied to reconstruct the stable hydrogen isotope composition of precipitation (delta H-2(precip)) and mean annual temperatures (MAT) of mid latitudes regions. Recently, the analytical procedure for measur...

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Main Authors: Greule, Markus (Author) , Wieland, Anna (Author) , Keppler, Frank (Author)
Format: Article (Journal)
Language:English
Published: 14 August 2021
In: Quaternary science reviews
Year: 2021, Volume: 268, Pages: 1-9
ISSN:0277-3791
DOI:10.1016/j.quascirev.2021.107107
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.quascirev.2021.107107
Verlag, lizenzpflichtig, Volltext: https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=DOISource&SrcApp=WOS&KeyAID=10.1016%2Fj.quascirev.2021.107107&DestApp=DOI&SrcAppSID=D1pZCaTrdvOlGCD31ZT&SrcJTitle=QUATERNARY+SCIENCE+REVIEWS&DestDOIRegistrantName=Elsevier
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Author Notes:Markus Greule, Anna Wieland, Frank Keppler

MARC

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520 |a Stable hydrogen isotope values of wood lignin methoxy groups (delta H-2(LM)) are increasingly applied to reconstruct the stable hydrogen isotope composition of precipitation (delta H-2(precip)) and mean annual temperatures (MAT) of mid latitudes regions. Recently, the analytical procedure for measuring delta H-2(LM) values was considerably improved by the availability of new reference materials that are in full accordance with the requirements of normalising stable isotope measurements. Using this improved procedure we determined the delta H-2(LM) values of tree rings from 40 geographical locations. Using these values, we present a revised relationship between delta H-2(LM) and delta H-2(precip) which is: delta H-2(precip) [mUr] = (delta H-2(LM) [mUr] thorn 206 mUr)/0.67. In addition, a new equation for reconstructions of MAT is: MAT [degrees C] = (delta H-2(LM) [mUr] thorn 272 mUr)/3.04 [mUr/degrees C]. We provide a simple numerical model that explains the observed biosynthetic isotope fraction pattern between delta H-2(LM) and delta H-2(precip). Finally, we applied the new equations to a previous data set for wood samples collected close to the Hohenpei(sic)enberg Meteorological Observatory in Germany. The data set included a 100-year-chronology (1916-2015) from nine tree ring cores removed from four beech trees. The MAT from delta H-2(LM) values reconstructed for this geographical location was 7.96 +/- 2.17 degrees C and in very good agreement with the observed mean MAT of 7.82 +/- 0.75 degrees C during this time period. Therefore, we conclude that the revised relationships between delta H-2(LM), delta H-2(precip) and MAT provide the basis for reliable application for paleoclimate reconstructions. (C) 2021 Elsevier Ltd. All rights reserved. 
650 4 |a Biosynthesis of lignin methoxy groups 
650 4 |a d/h ratios 
650 4 |a discriminations 
650 4 |a geographical origin 
650 4 |a hydrogen isotope ratios 
650 4 |a Isotope fractionation between methoxy groups and precipitation 
650 4 |a Lignin methoxy groups 
650 4 |a Mean annual temperature 
650 4 |a methylenetetrahydrofolate reductase 
650 4 |a oxygen 
650 4 |a Paleotemperature proxy 
650 4 |a stable hydrogen 
650 4 |a Stable hydrogen isotope analysis 
650 4 |a Stable hydrogen isotope values of precipitation 
650 4 |a trees 
650 4 |a water 
650 4 |a whole-wood 
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