Climate did not drive Common Era Maldivian sea-level lowstands
Climate did not drive Common Era Maldivian sea-level lowstands
复制标题
气候并未导致公元元马尔代夫海平面低位
DOI：
10.1038/s41561-021-00731-2
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发表时间：
2021
影响因子：
18.3
通讯作者：
Meltzner, Aron J.
中科院分区：
文献类型：
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作者：
Piecuch, Christopher G.;Kemp, Andrew C.;Gebbie, Geoffrey;Meltzner, Aron J.
由肯奇等人2在马尔代夫根据珊瑚微环礁重建的自1807年以来海平面上升的平均速率比附近验潮仪测量的准百年速率要快。为了解决印度洋缺乏近似连续的共同时代海平面重建的问题，肯奇等人2利用珊瑚化石重建了马尔代夫过去两千年的海平面。我们认为，在马尔代夫的0.6-1.4米百年海平面的变化太大，导致热收缩和膨胀的海水与大规模的气候强迫单独。我们量化了马尔代夫附近异常的海洋变冷或变暖在更大的背景下会是什么样的，如果它们足以驱动百年海平面趋势，就像Kench等人确定的那样大。我们同意肯奇等人的观点。2，这些百年海平面变化也不太可能反映地表冰和水体的重新分布14，因为类似的同时代变化没有得到其他中期和远场共同时代海平面重建的支持3，4。我们假设用于重建海平面的珊瑚经历了侵蚀，这可能使它们成为有偏见的（低）海平面记录器（补充资料），影响明显的海平面低水位。肯奇等人2（参考文献2的补充图3）展示的马尔代夫珊瑚样本图像显示，表面平坦，没有同心生长环，这可能表明受到侵蚀。如果用于重建马尔代夫海平面的珊瑚受到侵蚀，那么海平面变化、辐射强迫和海洋物理学可能会得到调和，这表明Kench等人2的记录不应被解释为与气候有关的现代海平面上升率的共同时代先例。需要从马尔代夫和更广泛的热带印度洋进行更多的代用重建，以复制马尔代夫的海平面重建，并更全面地量化共同时代期间海平面的地方，区域和全球变化。在线内容任何方法，其他参考文献，Nature Research报告摘要，源数据，扩展数据，补充信息，致谢，同行评审信息;作者贡献和竞争利益的详细信息;以及数据和代码可用性的声明可在https：//doi上获得。org/10.1038/s41561-021-00731-2。
MATTERS ARISING NATURE GEOSCIENCE average rate of sea-level rise since 1807 ce reconstructed by Kench et al. 2 in the Maldives from coral microatolls is faster than the quasi-centennial rates measured by nearby tide gauges. To address a paucity of near-continuous Common Era sea-level reconstructions in the Indian Ocean, Kench et al. 2 reconstructed sea level in the Maldives over the past two millennia using fossil corals. We suggest that the 0.6–1.4-m centennial sea-level changes in the Maldives are too large to have resulted from the thermal contraction and expansion of seawater related to large-scale climate forcing alone. We quantify how exceptional ocean cooling or warming near the Maldives would have been in a larger context were they sufficient to drive centennial sea-level trends as large as those determined by Kench et al. 2. We agree with Kench et al. 2 that it is also unlikely that these centennial sea-level changes reflect surface ice and water mass redistribution 14, as similar coeval changes are not supported by other intermediate-and far-field Common Era sea-level reconstructions 3, 4. We hypothesize that the corals used to reconstruct sea level experienced erosion, which could render them biased (low) sea-level recorders (Supplementary Information), effecting apparent sea-level lowstands. Images of example corals from the Maldives shown by Kench et al. 2 (Supplementary Fig. 3 of ref. 2) feature planar surfaces without concentric growth rings, which may indicate erosion. If the corals used for reconstructing sea level in the Maldives were eroded, then sea-level variability, radiative forcing and ocean physics might be reconciled, suggesting that the records of Kench et al. 2 should not be interpreted as a Common Era precedent for modern rates of sea-level rise related to climate. More proxy reconstructions from the Maldives and the wider tropical Indian Ocean are necessary to replicate the Maldives sea-level reconstruction, and more comprehensively quantify local, regional and global changes in sea level during the Common Era. online contentAny methods, additional references, Nature Research reporting summaries, source data, extended data, supplementary information, acknowledgements, peer review information; details of author contributions and competing interests; and statements of data and code availability are available at https://doi. org/10.1038/s41561-021-00731-2.