Shaw, Timothy A. and Plater, Andrew J and Kirby, Jason R and Roy, Keven and Holgate, Simon and Tutman, Pero and Cahill, Niamh and Horton, Benjamin P.
(2018)
Tectonic influences on late Holocene relative sea levels from the
central-eastern Adriatic coast of Croatia.
Quaternary Science Reviews, 200.
pp. 262-275.
ISSN 0277-3791
Abstract
Differential tectonic activity is a key factor responsible for variable relative sea-level (RSL) changes during
the late Holocene in the Adriatic. Here, we compare reconstructions of RSL from the central-eastern
Adriatic coast of Croatia with ICE-7G_NA (VM7) glacial-isostatic model RSL predictions to assess underlying driving mechanisms of RSL change during the past ~ 2700 years. Local standardized published
sea-level index points (n ¼ 23) were combined with a new salt-marsh RSL reconstruction and tide-gauge
measurements. We enumerated fossil foraminifera from a short salt-marsh sediment core constrained
vertically by modern foraminiferal distributions, and temporally by radiometric analyses providing subcentury resolution within a Bayesian age-depth framework. We modelled changes in RSL using an ErrorsIn-Variables Integrated Gaussian Process (EIV-IGP) model with full consideration of the available uncertainty. Previously established index points show RSL rising from 1.48 m at 715 BCE to 1.05 m by 100
CE at 0.52 mm/yr (0.82-1.87 mm/yr). Between 500 and 1000 CE RSL was 0.7 m below present rising
to 0.25 m at 1700 CE. RSL rise decreased to a minimum rate of 0.13 mm/yr (0.37-0.64 mm/yr) at ~1450
CE. The salt-marsh reconstruction shows RSL rose ~0.28 m since the early 18th century at an average rate
of 0.95 mm/yr. Magnitudes and rates of RSL change during the twentieth century are concurrent with
long-term tide-gauge measurements, with a rise of ~1.1 mm/yr. Predictions of RSL from the ICE-7G_NA
(VM7) glacial-isostatic model (0.25 m at 715 BCE) are consistently higher than the reconstruction
(1.48 m at 715 BCE) during the Late Holocene suggesting a subsidence rate of 0.45 ± 0.6 mm/yr. The new
salt-marsh reconstruction and regional index points coupled with glacial-isostatic and statistical models
estimate the magnitude and rate of RSL change and subsidence caused by the Adriatic tectonic
framework.
| Item Type: |
Article
|
| Keywords: |
Relative sea level;
Adriatic;
Croatia;
Late Holocene;
Glacial isostatic adjustment;
Tectonic subsidence;
Salt marsh;
Foraminifera; |
| Academic Unit: |
Faculty of Science and Engineering > Mathematics and Statistics |
| Item ID: |
13159 |
| Identification Number: |
https://doi.org/10.1016/j.quascirev.2018.09.015 |
| Depositing User: |
Niamh Cahill
|
| Date Deposited: |
31 Jul 2020 16:38 |
| Journal or Publication Title: |
Quaternary Science Reviews |
| Publisher: |
Elsevier |
| Refereed: |
Yes |
| URI: |
|
| Use Licence: |
This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available
here |
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