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

Author
Keywords
Abstract
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 processes1, 2, 3, 4, arising from circulation and variations in temperature and/or salinity, and by static equilibrium processes5, arising from mass redistributions changing gravity and the Earth\textquoterights rotation and shape. These sea-level variations form unique spatial patterns, yet there are very few observations verifying predicted patterns or fingerprints6. 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\textendash1979 and 1980\textendash2009, SLR rate increases in this northeast hotspot were ~ 3\textendash4 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\textendash36 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.
Year of Publication
2012
Journal
Nature Climate Change
Date Published
06/2012
ISSN Number
1758-6798
DOI
10.1038/nclimate1597