Publication Date:
2022-06-10
Description:
Patagonia Argentina is a key area for the study of sea level changes in the southern hemisphere, but the availability of
reliable sea level markers in this area is still problematic. In fact the storm deposits (beach ridge) commonly used here to reconstruct
past sea level oscillations introduce a wide error. Along the Puerto Deseado coast (Santa Cruz), morphometric analyses of 11 features
were carried out using traditional measurement tools and a digital software-based method (tested on one selected feature) with the
aim to investigate the possibility of their use as sea level markers. By undertaking accurate topographic profiles we identified the
relationship between notches and current sea level. In detail, we identified two clusters of notch retreat point elevations, with a very
low internal variability. The lower was located a little below the mean high tide level (mHT) and the upper located at least 0.5m
above the maximum high tide level (MHT). Field observations of tidal levels and the position of notches suggest that the lower
notches are active and the upper are inactive. This study on the abrasive notches attests their quality as sea level markers and opens
up the use of fossil abrasive notches as palaeo sea level markers because the error linked to these features is substantially smaller than that introduced by beach ridges commonly used in the study area
Description:
Published
Description:
1550 – 1558
Description:
4A. Clima e Oceani
Description:
JCR Journal
Description:
restricted
Keywords:
notch; rocky coast; sea level marker; Patagonia; Argentina
;
01. Atmosphere::01.01. Atmosphere::01.01.02. Climate
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
