ENSO impacts on Atlantic watersheds of South America

Isla, Federico Ignacio; Toldo, Elírio E.

doi:10.5380/abequa.v4i1-2.33032

Cited by 13 publications

(9 citation statements)

References 33 publications

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“… Locations of tide gauges (green circles) and meteorological stations (blue squares) used here. We do not use the Buenos Aires record after 1981 owing to possible land motion related to compaction [ Isla and Toldo , ].…”

Section: Methodsmentioning

confidence: 99%

Air pressure effects on sea level changes during the twentieth century

2016

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Interpretation of tide gauge data in terms sea level (η) and ocean dynamics requires estimates of air pressure (pa) to determine the ocean's isostatic response—the inverted barometer effect ( ηib). Three gridded pa products (HadSLP2, NOAA‐20CRv2, and ERA‐20C) are used alongside meteorological station pa and tide gauge η records to evaluate the contribution of ηib to η changes over the twentieth century. Agreement between gridded products is better during more recent periods and over regions with good historical data coverage, whereas it is worse for earlier time periods or in ocean areas with poor observational data coverage. Comparison against station data reveals the presence of systematic errors in the gridded products, for example, such that uncertainties estimated through differencing the gridded products underestimate the true errors by roughly 40% on interannual and decadal time scales. Notwithstanding such correlated errors, gridded products are still useful for interpretation of tide gauge data. Removing gridded estimates of ηib from η records reduces spatial variance in centennial trends across tide gauges by 10–30%, formal errors in centennial trends from individual gauges by ∼5%, and the temporal variance in detrended records by 10–15% on average (depending on choice of gridded product). Results here advocate for making the ηib correction to tide gauge records in studies of ocean circulation and global η over long, multidecadal, and centennial time scales using an ensemble mean taken across several gridded ηib products.

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Section: Methodsmentioning

confidence: 99%

Air pressure effects on sea level changes during the twentieth century

2016

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“…In a context with no significant sea-level variations, the generation of MBEC 10 seems to have been controlled by the development of the Gualeguay River Delta (GD), which suggests a random increase in precipitation in the Gualeguay River drainage basin because of the exceptional ENSO activity akin to that of the Super ENSO (Whang & Ren, 2017). The correlation between the ENSO effects and the development of the main IRPE geoforms is therefore indirect (Camilloni & Barros, 2003;Mackey, 2007;Mauas et al, 2011;Tedeschi & Collins, 2016;Isla & Toldo, 2013). The ENSO variations (Andreoli & Kayano, 2005) exerted a strong influence on the weather that controlled the final configuration of the geoforms, which constitute the sedimentary infill of the IRPE.…”

Section: Discussionmentioning

confidence: 99%

Chronology of recent sedimentary infill of the Inner Río de la Plata Estuary, Argentina

et al. 2021

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The Inner Río de la Plata Estuary is a sedimentary depositional system that resulted from fluvial-deltaic activity. Gentle Pliocene–Pleistocene slopes make-up the northern side of the estuary whereas small cliffs of the same age constitute the southern side. A long coastal estuarine barrier developed at about 6000 years BP when the maximum flooding surface occurred. Attached to this barrier, and at a lower elevation, is a large strandplain (covering an area of about 2400 km2) which displays more than 220 beach ridges. In different areas, the dating indicates a periodicity of 13.4–13.7 years for the development of each beach ridge. These data are like the periodicity of the ENSO effects, which could be associated with the variability of Sunspots. These ridges were formed shortly after the maximum flooding surface, which was followed by a gradual fall in sea-level that contributed significantly to the Inner Río de la Plata Estuary sedimentary infill. In addition, ENSO activities were probably instrumental in the distribution of the main geoforms in the Inner Rio de la Plata Estuary. Small deltas, which were generated by other rivers and creeks such as the Nogoyá Arroyo and the Gualeguay River, developed coevally with the coastal estuarine barrier. The Ibicuy Delta grew in the middle of the inner Río de la Plata Estuary when the former Paraná River flowed northwards during the sea-level fall. The upper part of the delta front was reworked, giving rise to a large dunefield. Thereafter, a chenier plain developed along with tidal flats. The current Paraná Delta continues to prograde at a rate of about 56–64 m/year (m year−1). The sedimentary infill of the Inner Río de la Plata Estuary occurred along the Holocene.

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“…Esto se relaciona con la ocurrencia de eventos excepcionales de exceso hídrico que generan inundaciones en una región que se caracteriza por la escasez de lluvia. Este tipo de eventos afectan a poblaciones localizadas cerca de cuerpos de agua (ríos y lagos) y han sido descriptos en diversos trabajos realizados en la Patagonia Argentina (Serra, 2004;Isla et al, 2013) La estación C. Inf., ubicada en la cuenca inferior, presentó mayor cantidad e intensidad de meses secos y menor ocurrencia e intensidad de meses húmedos que la estación C. Sup.…”

Section: Discussionunclassified