A WIGGLE-MATCHED 297-YR TREE-RING OXYGEN ISOTOPE RECORD FROM THAILAND: INVESTIGATING THE 14C OFFSET INDUCED BY AIR MASS TRANSPORT FROM THE INDIAN OCEAN

被引：1

作者：

Sano, Masaki ^{[1
]}

Pumijumnong, Nathsuda ^{[2
]}

Fujita, Koji ^{[1
]}

Hakozaki, Masataka ^{[3
]}

Miyake, Fusa ^{[4
]}

Nakatsuka, Takeshi ^{[1
]}

机构：

[1] Nagoya Univ, Grad Sch Environm Studies, Nagoya, Japan

[2] Mahidol Univ, Fac Environm & Resource Studies, Salaya, Thailand

[3] Natl Museum Japanese Hist, Sakura, Japan

[4] Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Japan

来源：

RADIOCARBON | 2023年 / 65卷 / 02期

基金：

日本学术振兴会;

关键词：

air mass pathway; C-14; offset; monsoon; teak; tree-ring delta O-18; wiggle matching; RADIOCARBON;

D O I：

10.1017/RDC.2023.14

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Regional offsets from Northern Hemisphere radiocarbon (C-14) calibration curves are widely recognized for monsoon Asia and often hinder accurate C-14 dating. In this paper, we explore the possible linkage between summer monsoon intensity and C-14 offsets using tree-ring d(18)O and C-14 data from Thailand. We developed a 297-yr floating tree-ring d(18)O chronology comprising seven teak log-coffin samples from the Ban Rai rock shelter site, northwestern Thailand. The outermost ring of our chronology was estimated to date from 358-383 CE, within a 95.4% (2s) probability range, based on a total of 10 C-14 measurements that were wiggle-matched against a mixed calibration curve evenly weighted from the IntCal20 and SHCal20 curves. Backward trajectory analysis showed that an intensified (weakened) summer monsoon detected in a modern tree-ring d(18)O chronology was most likely to be induced by increased (decreased) air mass transport from the tropical Indian Ocean, which is an area of intense upwelling where the C-14 concentration is lower than the atmospheric C-14 level. However, partly because of the limited sample size and dating uncertainty, the direct linkage between the tree-ring d(18)O series and C-14 records obtained from our teak log-coffin samples could not be statistically verified.

引用

页码：505 / 519

页数：15