The effect of long-term and decadal climate and hydrology variations on estuarine marsh dynamics: An identifying case study from the Río de la Plata

Schuerch, M., Scholten, Jan, Carretero, S., García-Rodríguez, F., Kumbier, K., Baechtiger, M. and Liebetrau, Volker (2016) The effect of long-term and decadal climate and hydrology variations on estuarine marsh dynamics: An identifying case study from the Río de la Plata Geomorphology, 269 . pp. 122-132. DOI 10.1016/j.geomorph.2016.06.029.

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Supplementary data:

Abstract

Highlights

• Vertical marsh growth in the RdlP is well above present and future SLR rates.
• Drivers for vertical marsh growth show high spatial variability within the estuary.
• Deposition rates on the RdlP marshes tend to be higher since the early 1970s.
• Extreme storm surges positively affect the growth of the outer RdlP marshes.
• Temporal variations in river discharge are more important for the inner RdlP marshes.

Abstract

The vertical growth of coastal wetlands is known to primarily be controlled by local tidal range and sediment availability as well as the occurrence of storm events. In estuaries, sediment availability additionally depends on riverine sediment input, the effect of which may be more pronounced in some parts of the estuary, thereby introducing a distinct spatial pattern that depends on the estuary's shape as well as the riverine sediment input and the hydro-meteorological regime. In the present study, we investigate how estuarine marshes along the whole Río de la Plata (RdlP) are affected by decadal and long-term variations in river discharge and storm activity. The El Niño Southern Oscillation (ENSO), in this context, appears to introduce a pronounced decadal variability on sediment loads brought into the RdlP. Based on 15 sediment cores, recovered along the RdlP and adjacent Atlantic coast, vertical marsh growth rates were studied using radionuclide dating (210Pb and 137Cs) and grain size distributions. By comparing these sedimentological records with historic river discharge and storm surge data, we spatially interpret the relative importance of temporal variations in river discharge and storm activity on estuarine marsh growth. By delivering the first estimates for vertical growth rates of the RdlP marshes, we conclude that with average vertical marsh growth rates between 0.4 and 2.6 cm year− 1, the RdlP marshes are highly resilient against drowning under present and future sea-level rise (SLR) conditions. Furthermore, our results confirm a large spatial variability of the drivers for vertical marsh growth; extreme storm surges appear to play a role in the development of the outer RdlP marshes whereas the temporal variations in river discharge seem to be hierarchically more important for the marshes in the inner estuary.

Document Type: Article
Additional Information: WOS:000381591500011
Keywords: Estuarine marshes; Río de la Plata; Sediment deposition; Decadal climate variability
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence > FO-R06
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
DOI etc.: 10.1016/j.geomorph.2016.06.029
ISSN: 0169-555X
Projects: Future Ocean
Date Deposited: 11 Jul 2016 07:54
Last Modified: 29 Mar 2018 10:58
URI: http://eprints.uni-kiel.de/id/eprint/33323

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