Earth Observatory of Singapore, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
Asian School of the Environment, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
Nat Commun. 2017 Feb 10;8:14387. doi: 10.1038/ncomms14387.
Sea-level rise is a global problem, yet to forecast future changes, we must understand how and why relative sea level (RSL) varied in the past, on local to global scales. In East and Southeast Asia, details of Holocene RSL are poorly understood. Here we present two independent high-resolution RSL proxy records from Belitung Island on the Sunda Shelf. These records capture spatial variations in glacial isostatic adjustment and paleotidal range, yet both reveal a RSL history between 6850 and 6500 cal years BP that includes two 0.6 m fluctuations, with rates of RSL change reaching 13±4 mm per year (2σ). Observations along the south coast of China, although of a lower resolution, reveal fluctuations similar in amplitude and timing to those on the Sunda Shelf. The consistency of the Southeast Asian records, from sites 2,600 km apart, suggests that the records reflect regional changes in RSL that are unprecedented in modern times.
海平面上升是一个全球性问题，但要预测未来的变化，我们必须了解过去在局部到全球范围内相对海平面（RSL）是如何以及为何变化的。在东亚和东南亚，全新世 RSL 的细节还不太清楚。在这里，我们从巽他陆架上的勿里洞岛（Belitung Island）提供了两个独立的高分辨率 RSL 代理记录。这些记录捕捉到了冰川均衡调整和古潮幅的空间变化，但都揭示了 6850 到 6500 年前的 RSL 历史，其中包括两个 0.6 米的波动，RSL 变化率达到 13±4 毫米/年（2σ）。尽管分辨率较低，但沿中国南海岸的观测结果显示出与巽他陆架相似的幅度和时间的波动。来自相距 2600 公里的两个地点的东南亚记录的一致性表明，这些记录反映了现代以前从未有过的 RSL 的区域变化。
