An extended late Holocene relative sea-level history for North Carolina, USA.

TitleAn extended late Holocene relative sea-level history for North Carolina, USA.
Publication TypeJournal Article
Year of Publication2017
AuthorsKemp AC, Kegel JJ, Culver SJ, Barber DC, Mallinson DJ, Leorri E, Bernhardt CE, Cahill N, Riggs SR, Woodson A L, Horton BP
JournalQuaternary Science Reviews
Volume160
Pagination13-30
Date Published03/2017
KeywordsForaminifera, Gulf Stream, Salt marsh, Tidal-range change
Abstract

We produced ∼3000-year long relative sea-level (RSL) histories for two sites in North Carolina (USA) using foraminifera preserved in new and existing cores of dated salt-marsh sediment. At Cedar Island, RSL rose by ∼2.4 m during the past ∼3000 years compared to ∼3.3 m at Roanoke Island. This spatial difference arises primarily from differential GIA that caused late Holocene RSL rise to be 0.1–0.2 mm/yr faster at Roanoke Island than at Cedar Island. However, a non-linear difference in RSL between the two study regions (particularly from ∼0 CE to ∼1250 CE) indicates that additional local- to regional-scale processes drove centennial-scale RSL change in North Carolina. Therefore, the Cedar Island and Roanoke Island records should be considered as independent of one another. Between-site differences on sub-millennial timescales cannot be adequately explained by non-stationary tides, sediment compaction, or local sediment dynamics. We propose that a period of accelerating RSL rise from ∼600 CE to 1100 CE that is present at Roanoke Island (and other sites north of Cape Hatteras at least as far as Connecticut), but absent at Cedar Island (and other sites south of Cape Hatteras at least as far as northeastern Florida) is a local-to regional-scale effect of dynamic ocean and/or atmospheric circulation.

URLhttp://www.sciencedirect.com/science/article/pii/S0277379116304759
DOI10.1016/j.quascirev.2017.01.012