Response of a low elevation carbonate lake in the Yucatan Peninsula (Mexico) to climatic and human forcings
Response of a low elevation carbonate lake in the Yucatan Peninsula (Mexico) to climatic and human forcings
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DOI：
10.1016/j.quascirev.2022.107445
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发表时间：
2022-04
影响因子：
4
通讯作者：
S. Metcalfe;J. Holmes;Matthew D. Jones;R. Gonzalez;Nick Primmer;Haydar Martinez Dyrzo;S. Davies;M. Leng
中科院分区：
文献类型：
--
作者：
S. Metcalfe;J. Holmes;Matthew D. Jones;R. Gonzalez;Nick Primmer;Haydar Martinez Dyrzo;S. Davies;M. Leng
气候变化的重要性，特别是干旱，在整个玛雅地区的北方新热带地区，仍然是一个激烈的辩论话题。这种讨论的一部分取决于不同档案和代理人对气候变化的反应的一致性。在本文中，我们提出了一个6600年的古湖泊记录Yaal Chac，碳酸盐湖（当地称为cenote）在尤卡坦半岛的北方低地，< 2公里的位置，以前公布的阿瓜达X 'Caamal记录。Yaal Chac序列已被分析烧失量（LOI），稳定同位素（δ 18 O，δ 13 C）和元素分析使用μXRF，辅以一些矿物学，木炭和颜料数据。中全新世沉积物，早于人类影响的证据，是碳酸盐为主，层压良好。δ 18 O值为正值（>2‰），但与δ 13 C无协变关系。一个重大的转变发生在约。4360 cal yr BP，变化为一般更多的有机沉积物和所有代理的变异性增加。虽然在Yaal Chac流域的人类活动的直接证据是有限的，似乎是可行的，人类的影响正在影响系统。与来自北方玛雅低地和更广泛地区的其他记录相比，在全新世中期几乎没有一致性，当时Yaal Chac似乎相当稳定，但可能对气候季节性的增加做出反应，推动了季节性纹层的产生。在全新世晚期，当气候普遍更加多变时，Yaal Chac和其他区域记录之间有更多的一致性，包括所谓的泛加勒比干旱期（BP 3500-2500 cal yr）和前古典时期晚期（BP 1800-1600 cal yr）的干旱。Yaal Chac的记录显示，无论是在玛雅“中断”还是玛雅“崩溃”的终端经典时期，都没有干旱的证据，但确实记录了公元14世纪至19世纪的干旱，与其他代理和历史记录保持一致。Yaal Chac的这一新记录突出了对气候强迫的响应的空间变异性以及认识到单个系统敏感性的重要性。
The importance of climate change, specifically drought, across the Maya region in the northern Neotropics, remains a topic of lively debate. Part of this discussion hinges on the coherency of response to climatic variability across different archives and proxies. In this paper we present a 6600-year palaeolimnological record from Yaal Chac, a carbonate lake (known locally as a cenote) in the northern lowlands of the Yucatan Peninsula, < 2 km from the location of the previously published Aguada X'Caamal record. The Yaal Chac sequence has been analysed for loss-on-ignition (LOI), stable isotopes (δ18O, δ13C) and elemental analysis using μXRF, complemented by some mineralogical, charcoal and pigment data. Mid Holocene sediments, predating evidence of human impact, are carbonate dominated and finely laminated. δ18O values are positive (>2‰), but show no covariation with δ13C. A major transition occurs at ca. 4360 cal yr BP, with a change to generally more organic sediments and increased variability in all proxies. Although direct evidence for anthropogenic activity in the Yaal Chac catchment is limited, it seems feasible that human impact was affecting the system. Comparison with other records from the Northern Maya lowlands and the wider region shows little coherence in the mid Holocene, when Yaal Chac seems to have been quite stable, but possibly responsive to increased climatic seasonality, driving the production of seasonal laminae. In the late Holocene, when the climate was generally more variable, there is more coherence between Yaal Chac and other regional records, including the so called Pan Caribbean Dry Period (3500–2500 cal yr BP) and the droughts of the late Pre-Classic period (1800–1600 cal yr BP). The Yaal Chac record shows no evidence of drought at the time of either the Maya ‘hiatus’ or the Maya ‘collapse’ of the Terminal Classic, but does record drying from the 14th to 19th centuries CE, in keeping with other proxy and historical records. This new record from Yaal Chac highlights the spatial variability of responses to climate forcings and the importance of recognising individual system sensitivity.