年际和年际树木年轮氧同位素信号对泰国西北部季风降雨的响应

IF 1.6 3区地球科学 Q3 GEOGRAPHY, PHYSICAL

Holocene Pub Date : 2022-12-21 DOI:10.1177/09596836221138352

Sineenart Preechamart, N. Pumijumnong, A. Bräuning, C. Muangsong, B. Cai, S. Buajan

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引用次数: 0

摘要

在泰国西北部德省Mae屯(MT)遗址，研究了年际(167年，A.D.1850-2016)和年内(A.D.2006-2016)的新柚木(Tectona grandis L.f.)树轮稳定氧同位素(δ18OTR)年代学。年际δ18OTR年代学与CRU TS4.03 5 - 10月区域降雨量呈显著负相关(r = - 0.678, p < 0.01)。我们建立了一个线性回归模型，可以解释46.0%的实际降雨量变化，并重建了1850年以来的季风季节降雨量。水汽条件的季节变化反映在年际δ18OTR变率上。降水量和降水δ18O (δ18Op)主要控制柚木δ18OTR的年内变化。这些结果表明，泰国柚木δ18OTR的变化主要受降雨的影响，突出了δ18OTR作为季风降雨指标的强度。

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Inter-annual and intra-annual tree-ring oxygen isotope signals in response to monsoon rainfall in northwestern Thailand

We present a new teak (Tectona grandis L.f.) tree-ring stable oxygen isotope (δ18OTR) chronology from Mae Tuen (MT) site, Tak province, northwestern Thailand at inter-annual (167-year, A.D.1850–2016) and intra-annual (A.D.2006–2016) timescales. The inter-annual δ18OTR chronology showed a significant negative correlation (r = −0.678, p < 0.01) with the May–October amount of regional rainfall obtained from CRU TS4.03. We established a linear regression model that explained 46.0% of the actual rainfall variance and reconstructed monsoon season rainfall back to A.D.1850. The seasonal variations in moisture conditions were reflected in inter-annual δ18OTR variability. The rainfall amount and δ18O in precipitation (δ18Op) mainly controlled intra-annual variations in teak δ18OTR. These results show that the variation in Thai teak δ18OTR is dominated by rainfall, highlighting the strength of δ18OTR as a monsoon rainfall proxy.

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来源期刊

Holocene 地学-地球科学综合

CiteScore

4.70

自引率

8.30%

发文量

106

审稿时长

4 months

期刊介绍： The Holocene is a high impact, peer-reviewed journal dedicated to fundamental scientific research at the interface between the long Quaternary record and the natural and human-induced environmental processes operating at the Earth''s surface today. The Holocene emphasizes environmental change over the last ca 11 700 years.