期刊
BIOGEOSCIENCES
卷 13, 期 13, 页码 3869-3886出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/bg-13-3869-2016
关键词
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资金
- Swiss National Science Foundation (SNF) through the Sinergia Project iTREE [CRSII3_136295]
- Division of Climate and Environmental Physics [200020-14174]
Records of stable oxygen isotope ratios in tree rings are valuable tools to reconstruct past climatic conditions and investigate the response of trees to those conditions. So far the use of stable oxygen isotope signatures of tree rings has not been systematically evaluated in dynamic global vegetation models (DGVMs). DGVMs integrate many hydrological and physiological processes and their application could improve proxy-model comparisons and the interpretation of oxygen isotope records. Here we present an approach to simulate leaf water and stem cellulose delta O-18 of trees using the LPX-Bern DGVM (LPX-Bern). Our results lie within a few per mil of measured tree ring delta O-18 of 31 different forest stands mainly located in Europe. Temporal means over the last 5 decades as well as interannual variations for a subset of sites in Switzerland are captured. A sensitivity analysis reveals that relative humidity, temperature, and the water isotope boundary conditions have the largest influence on simulated stem cellulose delta O-18, followed by all climatic factors combined, whereas increasing atmospheric CO2 and nitrogen deposition exert no impact. We conclude that simulations with LPX-Bern are useful for investigating large-scale oxygen isotope patterns of tree ring cellulose to elucidate the importance of different environmental factors on isotope variations and therefore help to reduce uncertainties in the interpretation of delta O-18 of tree rings.
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