当前位置:
X-MOL 学术
›
Quat. Sci. Rev.
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Holocene sea level reconstruction using lagoon specific local marine reservoir effect and geophysical modeling in Tongatapu, Kingdom of Tonga
Quaternary Science Reviews ( IF 4 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.quascirev.2020.106464 Naoto Fukuyo , Geoffrey Clark , Anthony Purcell , Phillip Parton , Yusuke Yokoyama
Quaternary Science Reviews ( IF 4 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.quascirev.2020.106464 Naoto Fukuyo , Geoffrey Clark , Anthony Purcell , Phillip Parton , Yusuke Yokoyama
Abstract Reconstructing the history of Holocene relative sea levels around Tonga provides essential constraints on the recent geological evolution of this region and paleoenvironmental context for archaeological studies. However, few sea level records are currently available in the region, and no quantitative paleoenvironmental studies using geochemical or geophysical methods have been reported. Here, we reconstruct the sea level history of Tongatapu Island using radiocarbon measurements and glacio-hydro-isostatic adjustment (GIA) modeling. Our analyses reconstructing the evolution of the lagoon suggest that the average size of Gafrarium tumidum decreased synchronously with corresponding changes in the paleoenvironment. These changes also correspond to the increasing trend of the lagoon specific local marine reservoir ages (ΔRlagoon) from 219 ± 78 to 368 ± 69 years between ∼2.6 and 0.4 ka. Sea surface salinity (SSS) decline within Fanga ’Uta lagoon was also synchronous with these changes caused by a gradual decrease in the exchange of water in and out of the lagoon. Estimated SSS from shell was somewhat higher ca. 2.6 cal kyr B.P. than the present, suggesting that the lagoon was relatively open to the ocean at that time. Our GIA modeling predicts mid-Holocene sea level highstand (HHS) was less than 1 m above the present sea level in Tongatapu, suggesting that previously reported observations of an HHS require additional contributions, perhaps from crustal uplift. Furthermore, recent GNSS observations of vertical uplift rates at Tongatapu are an order of magnitude higher than the long-term uplift rate obtained from Holocene sea level data.
中文翻译:
使用汤加王国汤加塔普泻湖特定局部海洋水库效应和地球物理模型重建全新世海平面
摘要 重建汤加周围全新世相对海平面的历史为该地区最近的地质演变和考古研究的古环境背景提供了必要的限制。然而,该地区目前可用的海平面记录很少,也没有使用地球化学或地球物理方法进行定量古环境研究的报道。在这里,我们使用放射性碳测量和冰川水等静压调整 (GIA) 模型重建汤加塔普岛的海平面历史。我们重建泻湖演化的分析表明,Gafrarium tumidum 的平均大小与古环境的相应变化同步减少。这些变化也对应于泻湖特定的局部海洋水库年龄(ΔRlagoon)从 219 ± 78 年到 368 ± 69 年在~2.6 和 0.4 ka 之间的增加趋势。Fanga'Uta 泻湖内的海面盐度 (SSS) 下降也与这些变化同步,这些变化是由进出泻湖的水交换逐渐减少引起的。来自 shell 的估计 SSS 稍高一些。比现在高 2.6 cal kyr BP,表明当时泻湖对海洋相对开放。我们的 GIA 模型预测全新世中期海平面高位 (HHS) 比汤加塔普目前的海平面高不到 1 m,这表明先前报告的 HHS 观测需要额外的贡献,可能来自地壳隆起。此外,
更新日期:2020-09-01
中文翻译:
使用汤加王国汤加塔普泻湖特定局部海洋水库效应和地球物理模型重建全新世海平面
摘要 重建汤加周围全新世相对海平面的历史为该地区最近的地质演变和考古研究的古环境背景提供了必要的限制。然而,该地区目前可用的海平面记录很少,也没有使用地球化学或地球物理方法进行定量古环境研究的报道。在这里,我们使用放射性碳测量和冰川水等静压调整 (GIA) 模型重建汤加塔普岛的海平面历史。我们重建泻湖演化的分析表明,Gafrarium tumidum 的平均大小与古环境的相应变化同步减少。这些变化也对应于泻湖特定的局部海洋水库年龄(ΔRlagoon)从 219 ± 78 年到 368 ± 69 年在~2.6 和 0.4 ka 之间的增加趋势。Fanga'Uta 泻湖内的海面盐度 (SSS) 下降也与这些变化同步,这些变化是由进出泻湖的水交换逐渐减少引起的。来自 shell 的估计 SSS 稍高一些。比现在高 2.6 cal kyr BP,表明当时泻湖对海洋相对开放。我们的 GIA 模型预测全新世中期海平面高位 (HHS) 比汤加塔普目前的海平面高不到 1 m,这表明先前报告的 HHS 观测需要额外的贡献,可能来自地壳隆起。此外,