Variability in terrigenous sediment supply offshore of the Río de la Plata  (Uruguay) recording the continental climatic history over the past 1200 years

Pérez, Laura; García-Rodríguez, Felipe; Hanebuth, Till J J

doi:10.5194/cp-12-623-2016

Cited by 50 publications

(34 citation statements)

References 64 publications

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“…The comparison with a precipitation reconstruction for the La Plata Basin from GeoB13813-4 (Perez et al, 2016;Figure 3c) shows the same excursion toward wet anomalies (higher freshwater diatom percentage) during the LIA period as seen in the first PC δ 18 O , indicative of a stronger monsoon. The La Plata drainage basin is a region that can receive high precipitation amounts during both strong and weak monsoon regimes.…”

Section: Geophysical Research Lettersmentioning

confidence: 60%

Coherent South American Monsoon Variability During the Last Millennium Revealed Through High‐Resolution Proxy Records

Campos

Cruz

Ambrizzi

et al. 2019

Geophysical Research Letters

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The number of paleoprecipitation records from the South American Monsoon domain that cover the last millennium has increased substantially in past years. However, hitherto most studies focused only on regional aspects, thereby neglecting the role of large‐scale monsoon variability and the mechanisms that link proxy locations in space and time. Here we decompose the South American Monsoon into its main modes of variability by applying a Monte Carlo principal component analysis to a compilation of 11 well‐dated summer paleoprecipitation records from tropical South America. The first mode represents changes in precipitation over the core monsoon domain, while the second mode is characterized by high loadings along the fringes of the South American Monsoon over Southeastern South America and the northern monsoon limit. Composite analysis reveals an enhanced monsoon with a wider, rather than a southward displaced, South Atlantic Convergence Zone during the early Little Ice Age, in contrast to previous interpretations.

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Section: Geophysical Research Lettersmentioning

confidence: 60%

Coherent South American Monsoon Variability During the Last Millennium Revealed Through High‐Resolution Proxy Records

Campos

Cruz

Ambrizzi

et al. 2019

Geophysical Research Letters

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“…Smith et al, 1979;Thomson et al, 2004;Hodell et al, 2008). High Fe/K ratios and low Ca/Fe on the other hand have been related to colder periods (Kuijpers et al, 2003;Perez et al, 2016). The increased Ca/Sr ratio above 7.6 m depth could therefore indicate a stronger meltwater flux, carrying ice-rafted debris into the channel, while the changes in Fe/K and Ca/Fe ratios at 7.1 to 7.3 m are also interpreted to indicate a switch from cold conditions (Unit 4) to warmer conditions (Unit 2/3).…”

Section: Climate Change Is a Likely Control On Creating Failure-pronementioning

confidence: 99%

A multi-disciplinary investigation of the AFEN Slide: the relationship between contourites and submarine landslides

Gatter

Clare

Hunt

et al. 2020

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The manuscript will undergo copyediting, typesetting and correction before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the book series pertain. Although reasonable efforts have been made to obtain all necessary permissions from third parties to include their copyrighted content within this article, their full citation and copyright line may not be present in this Accepted Manuscript version. Before using any content from this article, please refer to the Version of Record once published for full citation and copyright details, as permissions may be required.

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“…The chronology of core GeoB13813-4 is based on six radiocarbon dates, determined on bivalve shell samples that were distributed evenly over the core and preserved in life position (Table 1) (Perez et al, 2016).…”

Section: Stratigraphy and Chronologymentioning

confidence: 99%

“…Palaeoceanographic records derived from marine sediment cores taken at a mud belt, located on the inner shelf of the southwestern Atlantic Ocean, provide an exceptional sedimentary record to reconstruct climatic and environmental changes during the Late Holocene (Anderson, 2007;Lantzsch et al, 2014;Perez et al, 2016). In particular, pollen analyses significantly contribute to the knowledge of past vegetational and climatic changes over the South American continent because they capture the variability derived from an interaction between a large river system (discharge as a result of precipitation) and an oceanic frontal zone on the continental shelf (location as a result of the regional wind regime; Mourelle et al, 2015a;Gu et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Sediment core GeoB13813-4 was taken from such sediments, containing a 10-m long record that encompasses the past millennium (Lantzsch et al, 2014) and therefore yields a high-resolution archive for a detailed and continuous paleoecologically reconstruction. In this sense, Perez et al (2016Perez et al ( , 2017Perez et al ( , 2018 studied the diatom flora, conventional geochemical (C, N, and their isotopes), XRF element ratios (Ca, Ti, Al, Fe, and K) and biogenic silica (BSi) on core GeoB13813-4 to decipher the history of terrigenous sediment input from the RdlP system. In this study, we analyze the palynological content with in the same core in order to (1) determine how palynological assemblages changed in relation to the continental sediment supply, (2) evaluate the paleobotanical potential of this succession with regard to the different types of vegetation that proliferate in southeastern South America, and (3) integrate our results into a multi-proxy approach by comparing pollen to other paleoceanographic and paleolimnological records from the southeastern South America for the last 1000 cal yr BP in order to strengthen and update knowledge on climatic, environmental and oceanographic changes.…”

Section: Introductionmentioning

confidence: 99%

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Climatic, Environmental and Oceanographic Changes Over the Past Millennium, Reconstructed From a Palynological Record of the Inner Uruguayan Continental Shelf / Mudanças Climáticas, Ambientais E Oceanográficas Do Último Milénio, Reconstruídas a Partir De Um Registro Palinónico Da Plataforma Continental Interna Uruguaia

Mourelle¹,

Pérez²,

Hanebuth

et al. 2018

J. Sed. Env.

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In order to strengthen and update knowledge on climatic, environmental and oceanographic changes on the inner Uruguayan continental shelf, we studied pollen, dinocyst and other non-pollen palynomorph assemblages on the sediment core GeoB13813-4. This core was taken from the mud depocenter and its remarkable high sedimentation rate for the last ca. 1000 yr cal BP reflects the high terrigenous supply from the Rio de la Plata (RdlP). Most pollen and spores are originated from the RdlP grasslands, the vegetation that covers the lower reaches of the La Plata Drainage Basin (LPDB). They mainly represent the regionally dominant grasslands, but also the riparian forests, Butia yatay palm populations, and the herbaceous-bushy marshes around the mouth of the estuary. Pollen from salt marshes, Atlantic rainforest, and Araucaria forests located in southern Brazil reached the study site, probably transported by coastal ocean currents, whereas pollen from Andean regions would represent a long-distance transport by wind. Changes in both proportion and concentration of freshwater and marine palynomorphs indicate variability in freshwater input to the inner Uruguayan shelf. From ca. 1000 to 230 yr cal BP, significant marine influence of Subtropical Shelf Waters (STSW) was inferred, which was diluted by the freshwater supply from the Uruguayan mainland. This time interval was interrupted between ca. 690 to 575 yr cal BP by an increased freshwater contribution to the study area under the influence of Subantarctic Shelf Waters (SASW). From ca. 230 to 25 yr cal BP, a strong influence of RdlP waters was detected, only followed by another phase of dominant STSW during the past century. Such changes were related to regional climatic variability, i.e., Medieval Climate Anomaly, Little Ice Age and Current Warm Period. After ca. 1960 AD, the anthropogenic impact within the LPDB was clearly evidenced both by eutrophication and the first occurrence of Pinus pollen.ResumoA fim de melhorar e atualizar o conhecimento sobre mudanças climáticas, ambientais e oceanográficas na Plataforma Continental Uruguaia, foi estudado o pólen, os dinocistos e outras associações de palinomorfos não polínicos no testemunho de sedimentos GeoB13813-4. Este testemunho foi recolhido no depósito lodoso e a sua taxa de sedimentação durante os últimos ≈1000 anos antes do presente (BP; before present) reflete o elevado contributo terrígeno do Río de la Plata (RdlP) á área de estudo. Os resultados obtidos revelam que a maioria dos pólenes e esporos é originária das pastagens e da vegetação que cobre o curso inferior da Bacia de Drenagem do Río de la Plata (LPDB). Representam principalmente as pastagens, as quais são regionalmente dominantes, mas também matas ciliares, populações da palmeira Butia yatay e sapais herbáceos ao redor da foz do estuário. Pólen de sapais, Mata Atlântica e florestas de Araucária localizadas no sul do Brasil chegaram ao local de estudo, provavelmente transportados por correntes oceânicas costeiras. O pólen das regiões andinas poderá representar um transporte de longa distância pelo vento. Mudanças na proporção e concentração de palinomorfos de água doce e marinhos indicam variabilidade na entrada de água doce na plataforma continental interna uruguaia. Entre ≈1000-230 anos BP, os dados indicam a ocorrência de uma significativa influência marinha das Águas Subtropicais da Plataforma (STSW), misturadas com água doce do continente uruguaio. Este intervalo foi marcado, entre ≈690-575 anos BP, com uma maior contribuição de água doce para a área de estudo sob a influência de Águas Subantárticas (SASW). Entre ≈230-25 anos BP, foi detectada uma forte influência das águas do RdlP. Esta fase foi seguida, durante o século passado, por outra em que as STSW foram dominantes. Tais mudanças poderão ter sido causadas pela variabilidade climática regional, ou seja, Anomalia Climática Medieval, Pequena Idade do Gelo e Período Quente Atual. Desde ≈1960, o impacto antropogênico no LPDB está claramente evidenciado tanto pela eutrofização quanto pela primeira ocorrência de pólen de Pinus.

show abstract

Variability in terrigenous sediment supply offshore of the Río de la Plata (Uruguay) recording the continental climatic history over the past 1200 years

Cited by 50 publications

References 64 publications

Coherent South American Monsoon Variability During the Last Millennium Revealed Through High‐Resolution Proxy Records

Coherent South American Monsoon Variability During the Last Millennium Revealed Through High‐Resolution Proxy Records

A multi-disciplinary investigation of the AFEN Slide: the relationship between contourites and submarine landslides

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