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首页> 外文期刊>Quaternary geochronology >Radiocarbon analysis confirms annual periodicity in Cedrela odorata tree rings from the equatorial Amazon
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Radiocarbon analysis confirms annual periodicity in Cedrela odorata tree rings from the equatorial Amazon

机译：RadioCarbon分析确认了赤道亚马逊的Cedrela Odorata树戒指的年度周期

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摘要

A Cedrela odorata tree ring width chronology spanning from 1786 to 2016 was developed in the quasi-equatorial eastern Amazon Basin. Annual calendar dates were assigned using dendrochronological techniques at the Federal University of Lavras, Brazil. Due to its strategic location at the edge of the Equator (approximately 0 degrees 57'S), an independent confirmation of the annual periodicity of this century-long chronology would be of great value, allowing its future use for climate reconstruction and for filling gaps in upcoming atmospheric radiocarbon (C-14) compilations. For reconstruction of atmospheric C-14, high reliability of the dendrochronological calendar dates is a requirement. Here, we used high-precision C-14 bomb pulse dating (BPD) of selected C. odorata tree rings as a robust independent method to validate the dendrochronological dates. Eight calendar years from across the preto post-bomb period were tested through C-14 analysis of a-cellulose extracts (19 targets in total were produced from those 8 calendar years). All dendrochronologically dated tree rings measured produced C-14 values in perfect alignment with the Southern Hemisphere C-14 bomb curve, further confirming the annual growth of this important record. Extraction of a-cellulose was attained by a recently implemented procedure at the LamontDoherty Earth Observatory (LDEO). The method was C-14 assessed by high-precision measurements at the Keck Carbon Cycle Accelerator Mass Spectrometer (KCCAMS) at the University of California, Irvine (UCI) by measuring reference materials and unknown samples. High reproducibility of reference materials (within uncertainties) showed that the novel 150-funnel system and protocol developed at LDEO is reliable and can potentially expedite cellulose extractions for C-14 analysis.
机译：跨越2016年至2016年的Cedrela Odorata树环宽度时间是在亚马逊东部亚马逊河亚亚亚亚亚亚亚山地盆地开发。每年日历日期使用巴西联邦拉夫拉斯大学的Dentrochronological技术分配。由于其在赤道边缘的战略位置（约0度57的），自主确认本世纪长的年代学年的周期性将具有很大的价值，允许其未来用于气候重建以及填补即将填补差距大气辐射碳（C-14）编译。为了重建大气C-14，树木日历日期的高可靠性是一个要求。在这里，我们使用了所选C. Odorata树环的高精度C-14轰炸脉冲约会（BPD）作为一种坚固的独立方法，以验证树木学历。通过C-14对粉末周期的八个日历年来通过C-14分析来测试 - 纤维素提取物（总共有19个历年由那些8个历年产生）。所有树枝状日期呈现的树环测量，在与南半球C-14炸弹曲线完美对齐中产生了C-14值，进一步确认了这一重要记录的年增长率。通过最近在层状地球天然观测所（LDeo）的过程中获得纤维素的提取。该方法是通过测量参考资料和未知样品在加利福尼亚大学的Keck碳循环加速器质谱仪（KCCAM）的高精度测量来评估C-14。参考资料的高再现性（在不确定因素内）表明，在LDeo开发的新型150漏斗系统和方案是可靠的，并且可以加速C-14分析的纤维素萃取。

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