Hotspot of accelerated sea-level rise on the Atlantic coast of North America

Nature Climate Change
By: , and 



Climate warming does not force sea-level rise (SLR) at the same rate everywhere. Rather, there are spatial variations of SLR superimposed on a global average rise. These variations are forced by dynamic processes, arising from circulation and variations in temperature and/or salinity, and by static equilibrium processes, arising from mass redistributions changing gravity and the Earth's rotation and shape. These sea-level variations form unique spatial patterns, yet there are very few observations verifying predicted patterns or fingerprints. Here, we present evidence of recently accelerated SLR in a unique 1,000-km-long hotspot on the highly populated North American Atlantic coast north of Cape Hatteras and show that it is consistent with a modelled fingerprint of dynamic SLR. Between 1950–1979 and 1980–2009, SLR rate increases in this northeast hotspot were ~ 3–4 times higher than the global average. Modelled dynamic plus steric SLR by 2100 at New York City ranges with Intergovernmental Panel on Climate Change scenario from 36 to 51 cm (ref. 3); lower emission scenarios project 24–36 cm (ref. 7). Extrapolations from data herein range from 20 to 29 cm. SLR superimposed on storm surge, wave run-up and set-up will increase the vulnerability of coastal cities to flooding, and beaches and wetlands to deterioration.
Publication type Article
Publication Subtype Journal Article
Title Hotspot of accelerated sea-level rise on the Atlantic coast of North America
Series title Nature Climate Change
DOI 10.1038/nclimate1597
Volume 2
Issue 12
Year Published 2012
Language English
Publisher Nature Publishing Group
Publisher location London, U.K.
Contributing office(s) St. Petersburg Coastal and Marine Science Center
Description 5 p.
First page 884
Last page 888
Country Canada, United States
Other Geospatial Atlantic Coast, Cape Cod, Cape Hatteras, North America
Additional Online Files (Y/N) N
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