Spatial variability of late Holocene and 20th century sea-level rise along the Atlantic coast of the United States
- 1 December 2009
- journal article
- research article
- Published by Geological Society of America in Geology
- Vol. 37 (12), 1115-1118
- https://doi.org/10.1130/g30360a.1
Abstract
Accurate estimates of global sea-level rise in the pre-satellite era provide a context for 21st century sea-level predictions, but the use of tide-gauge records is complicated by the contributions from changes in land level due to glacial isostatic adjustment (GIA). We have constructed a rigorous quality-controlled database of late Holocene sea-level indices from the U.S. Atlantic coast, exhibiting subsidence rates of −1 in Maine, increasing to rates of 1.7 mm a−1 in Delaware, and a return to rates −1 in the Carolinas. This pattern can be attributed to ongoing GIA due to the demise of the Laurentide Ice Sheet. Our data allow us to define the geometry of the associated collapsing proglacial forebulge with a level of resolution unmatched by any other currently available method. The corresponding rates of relative sea-level rise serve as background rates on which future sea-level rise must be superimposed. We further employ the geological data to remove the GIA component from tide-gauge records to estimate a mean 20th century sea-level rise rate for the U.S. Atlantic coast of 1.8 ± 0.2 mm a−1, similar to the global average. However, we find a distinct spatial trend in the rate of 20th century sea-level rise, increasing from Maine to South Carolina. This is the first evidence of this phenomenon from observational data alone. We suggest this may be related to the melting of the Greenland ice sheet and/or ocean steric effects.This publication has 39 references indexed in Scilit:
- Model projections of rapid sea-level rise on the northeast coast of the United StatesNature Geoscience, 2009
- Mass balance of the Greenland ice sheet from 1958 to 2007Geophysical Research Letters, 2008
- Forcing of coastal sea level rise patterns in the North Atlantic and the Mediterranean SeaGeophysical Research Letters, 2007
- Tectonic control of subsidence and southward displacement of southeast Louisiana with respect to stable North AmericaGeophysical Research Letters, 2006
- On the rate and causes of twentieth century sea-level risePhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2006
- Combined Carbon Isotope and C/N Ratios as Indicators of Source and Fate of Organic Matter in a Poorly Flushed, Tropical Estuary: Hunts Bay, Kingston Harbour, JamaicaEstuarine, Coastal and Shelf Science, 1998
- Spatial variations in the rate of sea level rise caused by the present‐day melting of glaciers and ice sheetsGeophysical Research Letters, 1997
- Global sea level rise and glacial isostatic adjustment: An analysis of data from the East Coast of North AmericaGeophysical Research Letters, 1996
- Global sea level change: Determination and interpretationReviews of Geophysics, 1995
- Relationships of salt-marsh plant distributions to tidal levels in Connecticut, USAEnvironmental Management, 1987