Type

Journal Article

Authors

Orson van de Plassche
Troy Hill
Andrea Hawkes
Dan Charman
Benjamin Horton
Niamh Cahill
Robert Kopp
Matthew Brain
Robert Barnett
Robin Edwards
and 3 others

Subjects

Geology

Topics
20th century sea change benthic foraminifera sea level change relative sea level saltmarsh salt marsh non linear processes smart sustainable planet transfer functions atlantic ocean relative sea level change north atlantic

Relative sea-level change in Newfoundland, Canada during the past ~3000 years (2018)

Abstract Several processes contributing to coastal relative sea-level (RSL) change in the North Atlantic Ocean are observed and/or predicted to have distinctive spatial expressions that vary by latitude. To expand the latitudinal range of RSL records spanning the past ~3000 years and the likelihood of recognizing the characteristic fingerprints of these processes, we reconstructed RSL at two sites (Big River and Placentia) in Newfoundland from salt-marsh sediment. Bayesian transfer functions established the height of former sea level from preserved assemblages of foraminifera and testate amoebae. Age-depth models constrained by radiocarbon dates and chronohorizons estimated the timing of sediment deposition. During the past ~3000 years, RSL rose by ~3.0mat Big River and by ~1.5mat Placentia. A locally calibrated geotechnical model showed that post-depositional lowering through sediment compaction was minimal. To isolate and quantify contributions to RSL from global, regional linear, regional non-linear, and localscale processes, we decomposed the new reconstructions (and those in an expanded, global database) using a spatio-temporal statistical model. The global component confirms that 20th century sea-level rise occurred at the fastest, century-scale rate in over 3000 years (P > 0.999). Distinguishing the contributions from local and regional non-linear processes is made challenging by a sparse network of reconstructions. However, only a small contribution from local-scale processes is necessary to reconcile RSL reconstructions and modeled RSL trends. We identified three latitudinally-organized groups of sites that share coherent regional non-linear trends and indicate that dynamic redistribution of ocean mass by currents and/or winds was likely an important driver of sea-level change in the North Atlantic Ocean during the past ~3000 years.
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Full list of authors on original publication

Orson van de Plassche, Troy Hill, Andrea Hawkes, Dan Charman, Benjamin Horton, Niamh Cahill, Robert Kopp, Matthew Brain, Robert Barnett, Robin Edwards and 3 others

Experts in our system

1
Benjamin P. Horton
Maynooth University
Total Publications: 11
 
2
Niamh Cahill
Maynooth University
Total Publications: 16
 
3
Robin Edwards
Trinity College Dublin
Total Publications: 17