Holocene sea-level variability from Chesapeake Bay Tidal Marshes, USA
Holocene sea-level variability from Chesapeake Bay Tidal Marshes, USA
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DOI：
10.1177/0959683619862028
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发表时间：
2019-07
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通讯作者：
T. Cronin;Megan K Clevenger;N. Tibert;T. Prescott;M. Toomey;J. B. Hubeny;M. Abbott;Julia L. Seidenstein;Julia L. Seidenstein;Hannah Whitworth;S. Fisher;N. Wondolowski;A. Ruefer
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作者：
T. Cronin;Megan K Clevenger;N. Tibert;T. Prescott;M. Toomey;J. B. Hubeny;M. Abbott;Julia L. Seidenstein;Julia L. Seidenstein;Hannah Whitworth;S. Fisher;N. Wondolowski;A. Ruefer
我们重建了过去10,000年的全新世相对海平面上升（RSLR）从附近的沉积物岩芯记录切萨皮克湾，美国东部，包括新的沼泽记录从波托马克河和拉帕汉诺克河，弗吉尼亚州。结果表明，由于冰消期和冰川均衡调整（GIA沉降）的综合作用，从10到8千年（ka）的平均RSLR率为2.6毫米/年。从~6 ka到现在的平均RSLR率为1.4 mm yr-1，主要是由于GIA，与其他东海岸沼泽记录和地球物理模型一致。然而，在过去的1000年里，切萨皮克湾地区和其他东海岸沼泽地在“中世纪气候异常”（MCA）和“小冰期”（LIA）期间发生了长达多个世纪的潮汐沼泽发展，其平均速率逐渐变慢（<1.0 mm yr−1）。这种下降很可能是由于气候和冰川过程，并纠正GIA，代表了全球平均海平面（GMSL）的下降接近全新世末新冰期冷却。这些由史前气候和GIA驱动的切萨皮克湾海平面变化与基于切萨皮克湾验潮仪速率（3.1-4.5 mm yr−1）（追溯至1903年）的海平面变化形成鲜明对比。减去GIA沉降部分后，这些速率可以归因于海洋热膨胀加速（约1.0 mm yr−1）和高山冰川、格陵兰和南极冰盖质量损失（1.5-2.0 mm yr−1）的长期（千年）全球因素。
We reconstructed the last 10,000 years of Holocene relative sea-level rise (RSLR) from sediment core records near Chesapeake Bay, eastern United States, including new marsh records from the Potomac and Rappahannock Rivers, Virginia. Results show mean RSLR rates of 2.6 mm yr−1 from 10 to 8 kilo-annum (ka) due to combined final ice-sheet melting during deglaciation and glacio-isostatic adjustment (GIA subsidence). Mean RSLR rates from ~6 ka to present were 1.4 mm yr−1 due mainly to GIA, consistent with other East Coast marsh records and geophysical models. However, a progressively slower mean rate (<1.0 mm yr−1) characterized the last 1000 years when a multi-century-long period of tidal marsh development occurred during the ‘Medieval Climate Anomaly’ (MCA) and ‘Little Ice Age’ (LIA) in the Chesapeake Bay region and other East Coast marshes. This decrease was most likely due to climatic and glaciological processes and, correcting for GIA, represents a fall in global mean sea level (GMSL) near the end of Holocene Neoglacial cooling. These pre-historical climate- and GIA-driven Chesapeake Bay sea-level changes contrast sharply with those based on Chesapeake Bay tide-gauge rates (3.1–4.5 mm yr−1) (back to 1903). After subtracting the GIA subsidence component, these rates can be attributed to long-term (millennial) global factors of accelerated ocean thermal expansion (~1.0 mm yr−1) and mass loss from alpine glaciers and Greenland and Antarctic Ice Sheets (1.5–2.0 mm yr−1).