Abrupt variations in South American monsoon rainfall during the Holocene based on a speleothem record from central-eastern Brazil

Stríkis, Nicolás Misailidis; Cruz, F. W.; Cheng, Hai; Karmann, Ivo; Edwards, R. Lawrence; Vuille, Mathias; Wang, Xiangfeng; Paula, Marcos Saito de; Novello, Valdir F.; Auler, Augusto S.

doi:10.1130/g32098.1

Cited by 146 publications

(146 citation statements)

References 24 publications

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“…Many other events, such as for example the Bond events, are likely to have had spatial extents larger than previously believed in the monsoon regions (e.g., Gupta et al, 2003;Y. Wang et al, 2005;Stríkis et al, 2011, Cheng et al, 2012a. However, the amplitudes of the events are most likely smaller than the 8.2 ka event and, thus, potential noise associated with climatic proxies may be relatively high in comparison with the climate signals from the events themself.…”

Section: Centennial-scale Variations During the Holocenementioning

confidence: 87%

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The global monsoon across timescales: coherent variability of regional monsoons

et al. 2014

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Abstract. Monsoon has earned increasing attention from the climate community since the last century, yet only recently have regional monsoons been recognized as a global system. It remains a debated issue, however, as to what extent and at which timescales the global monsoon can be viewed as a major mode of climate variability. For this purpose, a PAGES (Past Global Changes) working group (WG) was set up to investigate the concept of the global monsoon and its future research directions. The WG's synthesis is presented here. On the basis of observation and proxy data, the WG found that the regional monsoons can vary coherently, although not perfectly, at various timescales, varying between interannual, interdecadal, centennial, millennial, orbital and tectonic timescales, conforming to the global monsoon concept across timescales. Within the global monsoon system, each subsystem has its own features, depending on its geographic and topographic conditions. Discrimination between global and regional components in the monsoon system is a key to revealing the driving factors in monsoon variations; hence, the global monsoon concept helps to enhance our understanding and to improve future projections of the regional monsoons. This paper starts with a historical review of the global monsoon concept in both modern and paleoclimatology, and an assessment of monsoon proxies used in regional and global scales. The main body of the paper is devoted to a summary of observation data at various timescales, providing evidence of the coherent global monsoon system. The paper concludes with a projection of future monsoon shifts in a warming world. The synthesis will be followed by a companion paper addressing driving mechanisms and outstanding issues in global monsoon studies.

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Section: Centennial-scale Variations During the Holocenementioning

confidence: 87%

“…The timing and structure of the event has been well documented in Asian (i.e., Hoti and Qunf records, Oman and Heshang-Dongge records, China) and South American monsoon records (i.e., Paixão, Padre Lapa Grande records) (X. Cheng et al, 2009b;Stríkis et al, 2011) (Fig. 11).…”

Section: Centennial-scale Variations During the Holocenementioning

confidence: 99%

The global monsoon across timescales: coherent variability of regional monsoons

et al. 2014

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“…Again, this temporal mismatch between peak fire activity and precipitation-driven compositional changes confirms our partitioning analysis, which indicates fire is important, but not the key driver of SDTF community turnover (figure 2). [32,33]. Modern precipitation-hydrological studies have demonstrated a strong link between annual rainfall over the Pantanal and the extent and length of flooding over the last century [12].…”

Section: Results and Interpretationmentioning

confidence: 99%

“…These include Lake Titicaca, which progressively decreased in lake level beginning approximately 7500 cal yr BP [46], and the Lapa Grande Cave record [33], which reports several large-amplitude dry-climate anomalies, persisting for several centuries, centred at 7800 and 7400 cal yr BP (figure 5a). Similar century-long droughts occur at Botuvera Cave, located at 278S, near the exit of the SALLJ, demonstrating the regional impact of drought conditions during the Early Holocene (figure 5b).…”

Section: Discussionmentioning

confidence: 99%

Fire, climate and vegetation linkages in the Bolivian Chiquitano seasonally dry tropical forest

Power

Whitney

Mayle

et al. 2016

Phil. Trans. R. Soc. B

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One contribution of 24 to a discussion meeting issue 'The interaction of fire and mankind'. South American seasonally dry tropical forests (SDTFs) are critically endangered, with only a small proportion of their original distribution remaining. This paper presents a 12 000 year reconstruction of climate change, fire and vegetation dynamics in the Bolivian Chiquitano SDTF, based upon pollen and charcoal analysis, to examine the resilience of this ecosystem to drought and fire. Our analysis demonstrates a complex relationship between climate, fire and floristic composition over multi-millennial time scales, and reveals that moisture variability is the dominant control upon community turnover in this ecosystem. Maximum drought during the Early Holocene, consistent with regional drought reconstructions, correlates with a period of significant fire activity between 8000 and 7000 cal yr BP which resulted in a decrease in SDTF diversity. As fire activity declined but severe regional droughts persisted through the Middle Holocene, SDTFs, including Anadenanthera and Astronium, became firmly established in the Bolivian lowlands. The trend of decreasing fire activity during the last two millennia promotes the idea among forest ecologists that SDTFs are threatened by fire. Our analysis shows that the Chiquitano seasonally dry biome has been more resilient to Holocene changes in climate and fire regime than previously assumed, but raises questions over whether this resilience will continue in the future under increased temperatures and drought coupled with a higher frequency anthropogenic fire regime.This article is part of the themed issue 'The interaction of fire and mankind'.

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“…This climatic context persisted throughout the Holocene, with an incidence of more frequent and more abrupt events, such as BOND Events in the North Atlantic and solar forcing, which have been recorded in central Brazil deposits (Bertaux et al 2002, Strikis et al 2011, Vuille et al 2012, Novello et al 2016.…”

Section: Regional Settingmentioning

confidence: 99%

Paleoenvironmental Evolution of Continental Carbonates in West-Central Brazil

Oliveira

Rossetti

Utida

2017

An. Acad. Bras. Ciênc.

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This paper presents a sedimentological and stratigraphical study of Quaternary (Middle to Late Pleistocene/ Holocene) continental carbonates outcrops inside Pantanal Basin and its surroundings, especially in Serra da Bodoquena, Pantanal do Miranda and Corumbá/Ladário plateau, in the state of Mato Grosso do Sul, as well as in Serra das Araras, in the state of Mato Grosso. The aim is to understand the depositional paleoenvironments and analyse climate and tectonic influences in their genesis and evolution. The results show that the deposition of these continental carbonates started in the Middle to Late Pleistocene and have continued, with some interruptions, until the present days. Sedimentary successions were identified in the different areas, without complete correlation. Two sedimentary successions separated by an erosional surface were described in Serra da Bodoquena and Serra das Araras. In Corumbá and Pantanal do Miranda, only one succession was described. These successions were deposited in elongated lakes parallel to fault planes; small lakes, related plains and plateaus; springs related to cliffs produced by faulting; rivers conditioned by topographic variation. The climatic interpretation, without proper temporal resolution, obtained by the stable-isotope composition and stratigraphic interpretation, indicates alternation of dry and wet periods. The Neoproterozoic faults with their neotectonics and the subsidence of the Pantanal Basin, are the major control for carbonated water flow and development of depositional areas, gradually turning plateaus into slight tilted areas, allowing the evolution of depositional systems from lakes to rivers.

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Abrupt variations in South American monsoon rainfall during the Holocene based on a speleothem record from central-eastern Brazil

Cited by 146 publications

References 24 publications

The global monsoon across timescales: coherent variability of regional monsoons

The global monsoon across timescales: coherent variability of regional monsoons

Fire, climate and vegetation linkages in the Bolivian Chiquitano seasonally dry tropical forest

Paleoenvironmental Evolution of Continental Carbonates in West-Central Brazil

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