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\begin{document}

\title{River effects on sea-level rise in the R\selectlanguage{ngerman}ío de la Plata during the past
century\selectlanguage{english}}



\author[1]{Christopher Piecuch}%
\affil[1]{Woods Hole Oceanographic Institution}%


\vspace{-1em}



  
  \date{May 27, 2024}


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\begin{abstract}
Identifying the causes for historical sea-level changes in coastal
tide-gauge records is important for constraining oceanographic,
geologic, and climatic processes. The R\selectlanguage{ngerman}ío de la Plata estuary in South
America features the longest tide-gauge records in the South Atlantic.
Despite the relevance of these data for large-scale circulation and
climate studies, the mechanisms underlying relative sea-level changes in
this region during the past century have not been firmly established. I
study annual data from tide gauges in the Río de la Plata and stream
gauges along the Río Paraná and Río Uruguay to establish relationships
between river streamflow and sea level over 1931-2014. Regression
analysis suggests that streamflow explains 59\%+/-17\% of the total
sea-level variance at Buenos Aires, Argentina, and 28\%+/-21\% at
Montevideo, Uruguay (95\% confidence intervals). A longterm streamflow
increase effected sea-level trends of 0.71+/-0.35 mm/yr at Buenos Aires
and 0.48+/-0.38 mm/yr at Montevideo. More generally, sea level at Buenos
Aires and Montevideo respectively rises by (7.3+/-1.8)x10\^{}-6 m and
(4.7+/-2.6)x10\^{}-6 m per 1 m\^{}3 s\^{}-1 streamflow increase. These
observational results are consistent with simple theories for the
coastal sea-level response to streamflow forcing, suggesting a causal
relationship between streamflow and sea level mediated by ocean
dynamics. Findings advance understanding of local, regional, and global
sea-level changes, clarify sea-level physics, inform future projections
of coastal sea level and the interpretation of satellite data and proxy
reconstructions, and highlight future research directions.%
\end{abstract}\selectlanguage{ngerman}%



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