Asynchrony in key Holocene chronologies: Evidence from Irish bog pines
Asynchrony in key Holocene chronologies: Evidence from Irish bog pines
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DOI：
10.1130/g36914.1
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发表时间：
2015-09
期刊：
影响因子：
5.8
通讯作者：
Max Torbenson;G. Plunkett;David Brown;J. Pilcher;H. Leuschner
中科院分区：
文献类型：
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作者：
Max Torbenson;G. Plunkett;David Brown;J. Pilcher;H. Leuschner
2005年格陵兰冰芯年表（GICC 05）和放射性碳校准曲线（IntCal）是最近10 k.y古气候和古环境研究中最重要的时间尺度。由于不同的，往往是不够的日期分辨率，机会来测试这两个有影响力的年表的同步性是罕见的。在这里，我们提出的证据，一个阶段的主要松树招聘爱尔兰沼泽在CA。8160年B.P.从三个网站的亚化石树木的Dendrochronous约会揭示了同步性在整个研究区域的发芽，区域强迫的指示。泥炭地上的松树的并发殖民地解释干燥的表面条件，并提供了第一个实质性的代理数据，在支持一个显着的水文气候变化伴随着8.2万年的气候变冷事件在爱尔兰北部。松树建立的日期与事件的GICC 05年龄范围不重叠，并且响应之间可能的滞后不太可能解释全部差异。鉴于最近的研究强调了GICC05和IntCal日期可能存在的偏移，爱尔兰松记录支持冰芯日期在研究期间过早的概念。如果所建议的时间差异是时间误差的人为产物，则可能影响对先前替代比较和比对的解释。
The Greenland Ice Core Chronology 2005 (GICC05) and the radiocarbon calibration curve (IntCal) are the foremost time scales used in paleoclimatic and paleoenvironmental studies of the most recent 10 k.y. Due to varying and often insufficient dating resolution, opportunities to test the synchrony of these two influential chronologies are rare. Here we present evidence for a phase of major pine recruitment on Irish bogs at ca. 8160 yr B.P. Dendrochronological dating of subfossil trees from three sites reveals synchronicity in germination across the study area, indicative of a regional forcing. The concurrent colonization of pine on peatland is interpreted in terms of drier surface conditions and provides the first substantive proxy data in support of a significant hydroclimatic change in the north of Ireland accompanying the 8.2 ka climate cooling event. The date of pine establishment does not overlap with the GICC05 age range for the event, and possible lags between responses are unlikely to explain the full difference. In light of recent studies highlighting a possible offset in GICC05 and IntCal dates, the Irish pine record supports the notion of ice core dates being too early during the period of study. If the suggested discrepancy in timing is an artifact of chronological error, it is likely to have affected interpretations of previous proxy comparisons and alignments.