气候变化领域集成服务门户(CCPortal): Saltmarsh sustainability throughout the Holocene in Boston Harbor: A new sea-level curve for the lower Gulf of Maine and implications of recent anthropogenic alteration

CCPortal

DOI	10.1016/j.quascirev.2020.106383
	Saltmarsh sustainability throughout the Holocene in Boston Harbor: A new sea-level curve for the lower Gulf of Maine and implications of recent anthropogenic alteration
	Wilson C.A.; Hughes Z.J.; FitzGerald D.M.; Kolker A.S.; Lynch J.C.; Rosen P.
发表日期	2020
ISSN	0277-3791
卷号	240
英文摘要	Saltmarsh evolution is closely linked to sea-level rise (SLR) and sediment supply. In a regime of accelerating SLR, saltmarsh survival depends on the ability of the marsh platform to grow vertically through organic and inorganic accumulation, and laterally via transgression over adjacent uplands. In formerly glaciated settings, the formation and maintenance of a saltmarsh are complicated by steep uplands, low sediment availability, isostatic rebound, changes to tidal amplitudes, and anthropogenic alteration. While much work has examined the development of large saltmarshes in New England since the mid-Holocene and Anthropocene, little is known about the smaller isolated saltmarshes that form in pockets along the glaciated coastline. We use radiocarbon dates from newly uncovered index points (basal peat) within Boston Harbor to date one of the oldest saltmarshes in the region (∼4.2 ka), and calculate the polynomial relative sea-level curve (RSLR) for the lower Gulf of Maine taking into account tidal amplification throughout the Holocene. This study informs the historical persistence of isolated saltmarshes under varying rates of sea-level rise (magnitude as much as 2 mm yr−1). Additionally, we refine the timing and rates of the mid-Holocene sea-level deceleration in this region: between 2.8 and 3.3 ka, slowing from 2.1 mm yr−1 to 0.5 mm yr−1. RSLR determined from the past century of tide gauge data is 2.86 mm yr−1, five times greater than historic rates over the past 2000 years. Recent vertical accretion rates (determined from marker horizons and 210Pb data) indicate that portions of Boston Harbor's saltmarshes are able to keep pace with current RSLR. However, historical diking and ditching practices appear to have resulted in elevation loss and conversion from high saltmarsh platforms to low saltmarsh platforms, largely influencing the amount of inorganic sediment needed to help maintain marsh surfaces. These results highlight that knowledge of historical anthropogenic modifications and changes in hydroperiod are critical when interpreting vertical accretion results. More importantly, anthropogenic modification within sediment starved saltmarshes may be the cause for cannibalization of marsh shorelines, whereby inorganic sediment eroded from marsh edges is recycled and delivered to the surface, facilitating vertical accretion that offsets RSLR. Under modern accelerated sea-level rise and decreased sediment supply, this cannibalization process may now be the only pathway for saltmarsh survival. © 2020 Elsevier Ltd
英文关键词	Holocene; Saltmarshes; Sea-level rise; Sedimentology; Vegetation dynamics
语种	英语
scopus关键词	Sediments; Tide gages; Wetlands; Accelerated sea-level rise; Anthropogenic modification; Holocene sea level; Inorganic sediments; Radiocarbon dates; Relative sea level; Sediment availability; Vertical accretion; Sea level; accretion; Anthropocene; cannibalism; Holocene; hydroperiod; marsh; radiocarbon dating; saltmarsh; sea level change; survival; sustainability; tide gauge; Atlantic Ocean; Boston Harbor; Gulf of Maine; Massachusetts; New England; United States
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151424
作者单位	Dept of Geology and Geophysics, Louisiana State University, Baton Rouge, LA, United States; Coastal Studies Institute, Louisiana State University, Baton Rouge, LA, United States; Dept of Earth and the Environment, Boston University, Boston, MA, United States; Louisiana Universities Marine Consortium, Chauvin, LA, United States; National Park Service, Northeast Coastal & Barrier Network, Washington, United States; Department of Marine and Environmental Sciences, Northeastern University, Boston, MA, United States
推荐引用方式 GB/T 7714	Wilson C.A.,Hughes Z.J.,FitzGerald D.M.,et al. Saltmarsh sustainability throughout the Holocene in Boston Harbor: A new sea-level curve for the lower Gulf of Maine and implications of recent anthropogenic alteration[J],2020,240.
APA	Wilson C.A.,Hughes Z.J.,FitzGerald D.M.,Kolker A.S.,Lynch J.C.,&Rosen P..(2020).Saltmarsh sustainability throughout the Holocene in Boston Harbor: A new sea-level curve for the lower Gulf of Maine and implications of recent anthropogenic alteration.Quaternary Science Reviews,240.
MLA	Wilson C.A.,et al."Saltmarsh sustainability throughout the Holocene in Boston Harbor: A new sea-level curve for the lower Gulf of Maine and implications of recent anthropogenic alteration".Quaternary Science Reviews 240(2020).