Forcing of western tropical South Atlantic sea surface temperature across three glacial-interglacial cycles

Hou, Alicia Meng Xiao; Bahr, André; Schmidt, Stefan; Strebl, Cornelia; Albuquerque, Ana Luíza Spadano; Chiessi, Cristiano Mazur; Friedrich, Oliver

doi:10.1016/j.gloplacha.2020.103150

Cited by 20 publications

(47 citation statements)

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“…(a) Atmospheric p CO 2 (red line) (EPICA Dome C, Monnin et al, 2001; Vostok, Petit et al, 1999) (note reversed scale). (b) Interhemispheric Atlantic sea surface temperature (SST) gradient between Sites M125‐55‐7 (western tropical South Atlantic; Hou et al, 2020) and U1313 (midlatitude North Atlantic; Naafs et al, 2012) (green line). (c) South Atlantic intrahemispheric SST gradient between Sites M125‐55‐7 and PS2489‐2 (subantarctic zone; Becquey & Gersonde, 2003) (blue line).…”

Section: Resultsmentioning

confidence: 99%

“…(a) Site M125‐55‐7 ice‐volume‐free seawater oxygen isotopic composition ( δ 18 O IVF‐SW ; black line) based on Globigerinoides ruber (pink) δ 18 O and Mg/Ca (Hou et al, 2020) and (b) ln (Ti/Ca) ratios from X‐ray fluorescence scanning (blue line). Green bars and numbers at the top denote Marine Isotope Stages (MIS).…”

Section: Resultsmentioning

confidence: 99%

“…Seawater δ 18 O composition ( δ 18 O SW ) was estimated with the temperature‐ δ 18 O relationship of Mulitza et al (2003) [SST = 14.2 − 4.44 ( δ 18 O C − δ 18 O SW )], using G. ruber (pink) SST Mg/Ca (Hou et al, 2020) and δ 18 O G. ruber . δ 18 O IVF‐SW , a proxy for sea surface salinity, was computed by removing the effect of global ice volume on δ 18 O SW using the ice volume reconstruction of de Boer et al (2014).…”

Section: Methodsmentioning

confidence: 99%

“…An in-house carbonate standard (Solnhofen limestone) calibrated against the reference material IAEA-603 (calcite; δ 18 O VPDB = −2.37 ± 0.04‰) was used to normalize measured raw δ 18 O values to the VPDB isotope reference scale. The analytical precision for δ 18 O is better than 0.054‰ (1σ) based on replicate measurements (n = 23) of the in-house standard Hou et al, 2020). and δ 18 O G. ruber .…”

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confidence: 87%

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Insolation and Greenhouse Gas Forcing of the South American Monsoon System Across Three Glacial‐Interglacial Cycles

Hou

Bahr

Raddatz

et al. 2020

Geophysical Research Letters

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Precipitation extremes with devastating socioeconomic consequences within the South American Monsoon System (SAMS) are expected to become more frequent in the near future. The complexity in SAMS behavior, however, poses severe challenges for reliable future projections. Thus, robust paleomonsoon records are needed to constrain the high spatiotemporal variability in the response of SAMS rainfall to different climatic drivers. This study uses Ti/Ca ratios from X‐ray fluorescence scanning of a sediment core retrieved off eastern Brazilian to trace precipitation changes over the past 322 Kyr. The results indicate that despite the spatiotemporal complexity of the SAMS, insolation forcing is the primary pacemaker of variations in the monsoonal system. Additional modulation by atmospheric pCO2 suggests that SAMS intensity over eastern Brazil will be suppressed by rising CO2 emissions in the future. Lastly, our record reveals an unprecedented strong and persistent wet period during Marine Isotope Stage 6 driven by anomalously strong trade winds.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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confidence: 87%

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Insolation and Greenhouse Gas Forcing of the South American Monsoon System Across Three Glacial‐Interglacial Cycles

Hou

Bahr

Raddatz

et al. 2020

Geophysical Research Letters

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“…The data were retrieved from the KNMI Climate Explorer (http://climexp.knmi.nl). Chang et al, 1997;Hou, Bahr, Schmidt, et al, 2020;Seidov & Maslin, 2001). Such changes influence the large-scale atmospheric circulation across the South Atlantic Ocean and South America, which is, for example, documented by a southward shift and/or expansion of the Hadley Cell during high-northern-latitude cold phases (Asmerom et al, 2020;Vuille et al, 2012).…”

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confidence: 99%

Late Holocene Precipitation Fluctuations in South America Triggered by Variability of the North Atlantic Overturning Circulation

Bahr

Kaboth‐Bahr

Jaeschke

et al. 2021

Paleoceanog and Paleoclimatol

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 Marine record documents decadal-to millennial-scale fluctuations of monsoonal rainfall in eastern South America during the past 5000 years  Precipitation variability was caused by antiphased shifts of the South Atlantic Convergence Zone and South American Low-Level Jet  Changes in oceanic overturning strength mediate transfer of high-northern-latitude climate disturbances into Southern Hemisphere tropics Accepted ArticleThis article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

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The southern Brazilian tropical forest during the penultimate Pleistocene glaciation and its termination

Aviles,

Ledru,

Ricardi‐Branco

et al. 2024

J Quaternary Science

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To describe the composition of the penultimate glacial Brazilian Atlantic forest, we analyzed pollen, charcoal and diatoms deposited in the section from 871 to 1400 cm of core CO14 drilled in the Colônia basin in southeastern Brazil. The landscape was characterized by a cool grassland with three conifer genera: Araucaria, Podocarpus and Ephedra. Total arboreal pollen frequency did not change during the transition from glacial to interglacial conditions. Changes in Podocarpus frequency and concentration showed out‐of‐phase responses with austral summer insolation at an orbital scale while, at a millennial scale, both northern and southern hemisphere ice volume controlled the interplay between positions of the Inter‐Tropical Convergence Zone and South Tropical Front (STF), which in turn defined the latitudinal distribution of rainfall. The disappearance of Podocarpus and the decrease of Araucaria observed between ~167 and 160 ka were related to a dry interval which was not observed elsewhere. During Termination II a progressive decrease in conifer pollen taxa was in phase with a southward shift in the STF and increase in Atlantic sea surface temperatures. Our results show that southern hemisphere conifer distribution is strongly linked to austral summer insolation and winter precipitation and will be threatened by the southward expansion of the summer rainfall boundary.

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Forcing of western tropical South Atlantic sea surface temperature across three glacial-interglacial cycles

Cited by 20 publications

References 68 publications

Insolation and Greenhouse Gas Forcing of the South American Monsoon System Across Three Glacial‐Interglacial Cycles

Insolation and Greenhouse Gas Forcing of the South American Monsoon System Across Three Glacial‐Interglacial Cycles

Late Holocene Precipitation Fluctuations in South America Triggered by Variability of the North Atlantic Overturning Circulation

The southern Brazilian tropical forest during the penultimate Pleistocene glaciation and its termination

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