Towards the Third Millennium Changes in Siberian Triple Tree-Ring Stable Isotopes

Significant air temperature and precipitation changes have occurred since the 2000s in vulnerable Siberian subarctic regions and urged updates of available chronologies towards the third millennium. It is important to better understand recent climatic changes compared to the past decades, centuries...

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Bibliographic Details
Published in:Forests 2022-06, Vol.13 (6), p.934
Main Authors: Churakova (Sidorova), Olga V., Fonti, Marina V., Barinov, Valentin V., Zharkov, Mikhail S., Taynik, Anna V., Trushkina, Tatyana V., Kirdyanov, Alexander V., Arzac, Alberto, Saurer, Matthias
Format: Article
Language:English
Subjects:
Air temperature
Carbon
Cellulose
Climate change
Cold regions
Environmental conditions
Evaporation
Evapotranspiration
hydrogen
Hydrologic cycle
Hydrology
Hypotheses
Isotopes
larch
oxygen
Permafrost
permafrost thaw depth
Precipitation
Proxies
Rain
Relative humidity
Soil depth
Soil temperature
Soils
Stable isotopes
Summer
Time series
Tree rings
Trees
Water depth
Water uptake
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Summary:Significant air temperature and precipitation changes have occurred since the 2000s in vulnerable Siberian subarctic regions and urged updates of available chronologies towards the third millennium. It is important to better understand recent climatic changes compared to the past decades, centuries and even millennia. In this study, we present the first annually resolved triple tree-ring isotope dataset (δ13C, δ18O and δ2H) for the eastern part of the Taimyr Peninsula (TAY) and northeastern Yakutia (YAK) from 1900 to 2021. We found that the novel and largely unexplored δ2H of larch tree-ring cellulose was linked significantly with δ18O for the YAK site, which was affected by averaged April–June air temperatures and evaporation. Simulated by the Land Surface Processes and Exchanges (LPX-Bern 1.0) model, the water fraction per year for soil depths at 0–20 and 20–30 cm was significantly linked with the new eco-hydrological tree-ring δ2H data. Our results suggest increasing evapotranspiration and response of trees’ water relation to rising thaw water uptake from lower (20–30 cm) soil depth. A positive effect of July air temperature on tree-ring δ18O and a negative impact of July precipitation were found, indicating dry conditions. The δ13C in larch tree-ring cellulose for both sites showed negative correlations with July precipitation and relative humidity, confirming dry environmental conditions towards the third millennium.
ISSN:1999-4907
1999-4907
DOI:10.3390/f13060934