Unstable relationships between tree ring δ18O and climate variables over southwestern China: possible impacts from increasing central Pacific SSTs

An, Wenling; Liu, Xiaohong; Hou, Shugui; Zeng, Xiaomin; Sun, Weijun; Wang, Wenzhi; Wang, Yu; Xu, Guobao; Ren, Jiawen

doi:10.1007/s00704-018-2483-8

Cited by 6 publications

(2 citation statements)

References 50 publications

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“…In addition to decreasing coherency between PIWA and PIRO chronologies, climate-δ 18 O TR correlations were also weakened after the 1990s, except for the early monsoon precipitation in PIWA and late monsoon precipitation in both sites. Similar decoupling in response was also reported by several other studies worldwide (An et al 2019 ; Daux et al 2011 ; Reynolds-Henne et al 2007 ; Sarris et al 2013 ; Seftigen et al 2011 ; Szejner et al 2018 ). Recent climate change was identified as the principal driving factor for such a decoupling (Savard and Daux 2020 ).…”

Section: Discussionsupporting

confidence: 86%

Drought, temperature, and moisture availability: understanding the drivers of isotopic decoupling in native pine species of the Nepalese Himalaya

Aryal,

Grießinger,

Gaire

et al. 2024

Int J Biometeorol

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The Himalayas experienced long-term climate changes and recent extreme weather events that affected plant growth and the physiology of tree species at high-elevation sites. This study presents the first statistically robust δ18OTR chronologies for two native pine species, Pinus roxburghii, and Pinus wallichiana, in the lower Nepalese Himalaya. The isotope chronologies exhibited 0.88‰ differences in overall mean isotope values attributed to varying elevations (460–2000 m asl). Comparative analysis of climate response using data sets from different sources and resolutions revealed the superiority of the APHRODITE (Asian Precipitation – Highly-Resolved Observational Data Integration Towards Evaluation) data set calibrated for the South Asian Summer Monsoon (SASM)-dominated region. Both species exhibited negative correlations with monsoon precipitation and positive correlations with temperature. However, during the peak monsoon season (July-August), daily resolved climate data disentangled statistically insignificant relationships, and revealed that δ18OTR is influenced by atmospheric moisture. Both congeneric species showed a decoupling between the chronologies after 1995. However, no significant change in air moisture origin and monsoon regime between the study sites was observed, indicating a consistent dominant moisture source during different monsoon seasons. Besides, we also observed the decreased inter-series correlation of both δ18OTR chronologies after 1995, with P. wallichiana experiencing a steeper decrease than P. roxburghii. The weakening correlations between and within the chronologies coincided with a regional drought during 1993–1995 in both sites, highlighting the strong regulation of local climate on the impact of regional extreme climate events. Our findings emphasise the importance of employing climate data with optimal spatial and temporal resolution for improved δ18OTR-climate relationships at the intra-annual scale while considering the influence of site-specific local environmental conditions. Assessing climate data sets with station data is vital for accurately interpreting climate change’s impact on forest response and long-term climate reconstructions.

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Section: Discussionsupporting

confidence: 86%

Drought, temperature, and moisture availability: understanding the drivers of isotopic decoupling in native pine species of the Nepalese Himalaya

Aryal,

Grießinger,

Gaire

et al. 2024

Int J Biometeorol

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“…Oscillation (Reynolds-Henne et al, 2007). Similarly, the weakening of the earlywood  18 O response to climate (temperature, relative humidity -RH, VPD) of Abies forrestii from Southwestern China may be attributable to changes in atmospheric circulation patterns linked to Pacific sea surface temperatures (An et al, 2019). Another effect of the change of source water is the modification in the strength of the linkage between the  13 C and  18 O ratios.…”

Section: Switching Climatic Controlsmentioning

confidence: 99%

An Overview on Isotopic Divergences – Causes for instability of Tree-Ring Isotopes and Climate Correlations

Savard¹,

Daux²

2020

Preprint

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Abstract. Climatic reconstructions based on tree-ring isotopic series convey substantial information about past conditions prevailing in forested regions of the globe. However, in some cases, the relations between isotopic and climatic records appear unstable over time, generating the ‘isotopic divergences’. Former reviews have thoroughly discussed the divergence concept for tree-ring physical properties, but not for isotopes. Here we want to take stock of the isotopic divergence problem, express concerns and stimulate collaborative work for improving paleoclimatic reconstructions. There are five main causes for divergent parts in isotopic and climatic series. (1) Artefacts due to sampling and data treatment, relevant for dealing with long-series using sub-fossil stems. (2) Stand dynamics, including juvenile effects mostly occurring in the early part of tree-ring series. (3) Rise in atmospheric pCO2, which can directly influence the foliar behaviour. (4) Change of climate, which may modify the isotope-climate causal links. Finally (5), atmospheric pollution, which may alter leaf and root functions. Future paleoclimate research would benefit from interdisciplinary efforts designed to develop further process-based models integrating multi-proxy inputs, so to help identify causes of isotopic divergences and circumvent some of them in inverse applications.

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Pre-1930 unstable relationship between climate and tree-ring width of Pinus taiwanensis hayata in southeastern China

et al. 2019

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Unstable relationships between tree ring δ18O and climate variables over southwestern China: possible impacts from increasing central Pacific SSTs

Cited by 6 publications

References 50 publications

Drought, temperature, and moisture availability: understanding the drivers of isotopic decoupling in native pine species of the Nepalese Himalaya

Drought, temperature, and moisture availability: understanding the drivers of isotopic decoupling in native pine species of the Nepalese Himalaya

An Overview on Isotopic Divergences – Causes for instability of Tree-Ring Isotopes and Climate Correlations

Pre-1930 unstable relationship between climate and tree-ring width of Pinus taiwanensis hayata in southeastern China

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