Holocene coastal vegetation changes at the mouth of the Amazon River

Smith, Clarisse Beltrão; Cohen, Marcelo Cancela Lisboa; Pessenda, Luiz Carlos Ruiz; França, Marlon Carlos; Guimarães, José Tasso Felix; Rossetti, Dilce de Fátima; Lara, Rubén

doi:10.1016/j.revpalbo.2011.09.008

Cited by 23 publications

(16 citation statements)

References 64 publications

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“…Saltier waters near the coast are generally related to enhanced evaporation and/or reduced river discharge. These features are also related to a drier climate, corroborating the precipitation/moisture, lake levels, and air temperature palaeodata, as well as previous studies (Valdes, 2000;Cruz et al, 2009;Silva Dias et al, 2009). The BC transports warm waters southward, while the MC transports cold waters northward, and both are located off eastern South America (e.g.…”

Section: Temperaturesupporting

confidence: 90%

“…The general MH scenario corresponds to a drier eastern South America than during the LH, except for northeastern Brazil, which exhibits an unclear climate signal during the MH. A similar climatic scenario has already been discussed (Valdes, 2000;Cruz et al, 2009;Silva Dias et al, 2009). Valdes (2000) described drier conditions in South America (except for northeastern Brazil) during the MH austral summer (from December to February), derived from the first phase of PMIP data models.…”

Section: Precipitationmentioning

confidence: 61%

“…Cruz Jr. et al, 2005). Silva Dias et al (2009) have examined two MH numerical runs: the first one only considered variations in the orbital parameters, and the second one included changes in vegetation. The former run presented results very similar to Valdes (2000) and Cruz et al (2009), characterised by a drier-than-modern MH climate in South America during the wet season (December to February), except for northeastern Brazil.…”

Section: Precipitationmentioning

confidence: 99%

“…Recently, the Last Glacial Maximum (LGM) and the midHolocene (MH) have been the foci of numerous studies using data-model approaches (Pinot et al, 1999;Wainer et al, 2005;Kageyama et al, 2006;Braconnot et al, 2007a, b;Melo and Marengo, 2008;Silva Dias et al, 2009;Carré et al, 2012;and others). The LGM and the MH, corresponding to 21 000 calibrated years before present (cal yr BP) and 6000 cal yr BP, respectively (Braconnot et al, 2007a), are usually chosen because of their different boundary conditions, if compared to the late Holocene (LH), that can be used to test the response of climatic models (Joussaume and Braconnot, 1997).…”

Section: Introductionmentioning

confidence: 99%

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A mid-Holocene climate reconstruction for eastern South America

Prado¹,

Wainer²,

Chiessi³

et al. 2013

Clim. Past

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The mid-Holocene (6000 calibrated years before present) is a key period in palaeoclimatology because incoming summer insolation was lower than during the late Holocene in the Southern Hemisphere, whereas the opposite happened in the Northern Hemisphere. However, the effects of the decreased austral summer insolation over South American climate have been poorly discussed by palaeodata syntheses. In addition, only a few of the regional studies have characterised the mid-Holocene climate in South America through a multiproxy approach. Here, we present a multiproxy compilation of mid-Holocene palaeoclimate data for eastern South America. We compiled 120 palaeoclimatological datasets, which were published in 84 different papers. The palaeodata analysed here suggest a water deficit scenario in the majority of eastern South America during the mid-Holocene if compared to the late Holocene, with the exception of northeastern Brazil. Low mid-Holocene austral summer insolation caused a reduced land–sea temperature contrast and hence a weakened South American monsoon system circulation. This scenario is represented by a decrease in precipitation over the South Atlantic Convergence Zone area, saltier conditions along the South American continental margin, and lower lake levels

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Section: Temperaturesupporting

confidence: 90%

Section: Precipitationmentioning

confidence: 61%

Section: Precipitationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A mid-Holocene climate reconstruction for eastern South America

Prado¹,

Wainer²,

Chiessi³

et al. 2013

Clim. Past

View full text Add to dashboard Cite

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“…This shift is attributed to climate, river discharge and RSL changes (Behling et al, 2004;Cohen et al, 2005aCohen et al, , 2008Cohen et al, , 2009França et al, 2012;Lara and Cohen, 2009;Smith et al, 2011Smith et al, , 2012. However, in southeastern Brazil, the mangrove dynamics are mainly related to RSL changes (Buso Junior, 2010;Buso Junior et al, in press) and sediment transport (Amaral et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Mangrove vegetation changes on Holocene terraces of the Doce River, southeastern Brazil

França

Cohen

Pessenda³

et al. 2013

CATENA

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Late Holocene mangrove dynamics dominated by autogenic processes

Moraes

Fontes

Cohen

et al. 2017

Earth Surf Processes Landf

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Generally, palaeoenvironmental interpretations consider only allogenic processes, when autogenic factors may have a strong influence on proxies of stratigraphic sequences. For instance, the Holocene history of the vegetation along the southern littoral of the State of Bahia in north-eastern Brazil is characterized by mangrove dynamics controlled by allogenic processes. However, over smaller timescales (~700 years), autogenic processes may have controlled vegetation dynamics and hence observed pollen distribution. This work proposes tidal channel dynamics as one of the main cause for changes in pollen assemblage along the studied stratigraphic profiles during the last centuries, based on sedimentology, pollen and elemental analysis (δ 13 C, δ 15 N and C/N) and radiocarbon dating of sedimentary organic matter from two cores sampled from an abandoned meander and a tidal flat at the mouth of the Jucuruçu River. One core was sampled from a mangrove formed during the past~550 cal yr BP. Another core recorded sediments in a várzea forest (swamp seasonally and permanently inundated by freshwater) located~2.7 km from the current shoreline, which displayed a maximum age of~680 cal yr BP. Two facies associations were identified: tidal channel (A) and tidal flat/oxbow lake (B). This work proposes allogenic processes as the main driving forces controlling the wetlands dynamics at the studied site during the Holocene. However, our data also reveal that part of the changes in vegetation over the last~700 years reflect tidal channels and tidal flats development, which represent autogenic processes. The change in timescale analysis from the Holocene to recent centuries may have weakened the influence of allogenic factors. However, this needs interpretation with reference to the spatial scale of the depositional environment as the larger the depositional system analyzed, the stronger the influence of autogenic processes on stratigraphic sequences over longer timescales.

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Holocene coastal vegetation changes at the mouth of the Amazon River

Cited by 23 publications

References 64 publications

A mid-Holocene climate reconstruction for eastern South America

A mid-Holocene climate reconstruction for eastern South America

Mangrove vegetation changes on Holocene terraces of the Doce River, southeastern Brazil

Late Holocene mangrove dynamics dominated by autogenic processes

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