Synchronous and proportional deglacial changes in Atlantic meridional overturning and northeast Brazilian precipitation

Mulitza, Stefan; Chiessi, Cristiano Mazur; Schefuß, Enno; Lippold, Jörg; Wichmann, David; Antz, Benny; Mackensen, Andreas; Paul, André; Prange, Matthias; Rehfeld, Kira; Werner, Martin; Bickert, Torsten; Frank, Norbert; Kuhnert, Henning; Lynch‐Stieglitz, Jean; Portilho-Ramos, Rodrigo Costa; Sawakuchi, André Oliveira; Schulz, Michael; Schwenk, Tilmann; Tiedemann, Ralf; Vahlenkamp, Maximilian; Zhang, Y

doi:10.1002/2017pa003084

Cited by 122 publications

(139 citation statements)

References 75 publications

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“…The large lead of Pa/Th with respect to ln(Ti/Ca) is indeed clearly visible for the YD and all Heinrich stadials, except HS1 (Fig.2). The apparent synchronicity of the Pa/Th and ln(Ti/Ca) signals at the onset of HS1 in 10 core MD09-3257, as also recently observed in another core of the northern Brazilian margin (Mulitza et al, 2017), suggests that the sequence of events was different than at the beginning of the other Heinrich stadials. Also of note are the anomalously high sedimentary Pa/Th values at the onset of HS1, which are likely related to extremely high terrigenous particle fluxes (Fig.…”

Section: Lead Of Pa/th With Respect To Ln(ti/ca)supporting

confidence: 66%

Relative timing of precipitation and ocean circulation changes in the western equatorial Atlantic over the last 45 ky

Waelbroeck¹,

Pichat²,

Lougheed³

et al. 2018

Preprint

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Abstract. Thanks to its optimal location on the North Brazilian margin, core MD09-3257 records both ocean circulation and 15 atmospheric changes. The latter occur locally in the form of increased rainfall on the adjacent continent during the cold intervals recorded in Greenland ice and northern North Atlantic sediment cores (i.e. Greenland stadials). These rainfall Clim. Past Discuss., https://doi

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Section: Lead Of Pa/th With Respect To Ln(ti/ca)supporting

confidence: 66%

Relative timing of precipitation and ocean circulation changes in the western equatorial Atlantic over the last 45 ky

Waelbroeck¹,

Pichat²,

Lougheed³

et al. 2018

Preprint

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“…Core GeoB16202‐2 reaches 23.9 ka (± 0.6) close to its base at 7.63‐m core depth (Mulitza et al, ). For core GL‐1248, radiocarbon dating suggest an age of about 44.0 ± 0.7 ka at 6.30‐m core depth, and the bottom age is 128.7 ka at 16.66‐m core depth (Figure ).…”

Section: Methodsmentioning

confidence: 99%

Millennial‐ to Orbital‐Scale Responses of Western Equatorial Atlantic Thermocline Depth to Changes in the Trade Wind System Since the Last Interglacial

Venancio

Mulitza

Govin

et al. 2018

Paleoceanog and Paleoclimatol

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Surface ocean circulation in the western equatorial Atlantic is mainly wind driven and plays a major role for the transport of warm waters to the North Atlantic. Past changes in the strength and direction of the trade winds are well documented, but the response of the western equatorial Atlantic circulation and water column structure to these changes is unclear. Here we used the difference between the stable isotopic oxygen composition of two species of planktonic foraminifera (Globigerinoides ruber white and Neogloboquadrina dutertrei) from two sediment cores collected off northeastern Brazil to investigate millennial‐ and orbital‐scale changes in upper ocean stratification since the Last Interglacial. Our records indicate enhanced upper ocean stratification during several Heinrich stadials, partly due to a shoaling of the thermocline, which was linked to a decrease in the strength of southeast trades winds. In addition, we show that a decrease in wind zonality induced by increases in Northern Hemisphere low‐latitude summer insolation causes a shoaling of the thermocline in the western equatorial Atlantic. These ocean‐atmosphere changes contributed to a reduction in the cross‐equatorial transport of warm waters, particularly during Heinrich stadials and Marine Isotope Stage 4.

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“…Digital elevation model (ETOPO1; Amante & Eakins, ) of northeastern South America and the adjacent Atlantic. The map shows the Parnaíba River drainage basin (white lines); the location of marine sediment cores GeoB3104‐1 (Arz et al, ), GeoB16206‐1 (Zhang et al, ; this study), and GeoB16202‐2 (Mulitza et al, ; white circles); the area for simulated precipitation from the transient model run TraCE‐21ka (Liu et al, ; black dashed rectangle); and the location of the continental samples (black rectangles: I—Porcos Lake; II and III—medium and low Parnaíba River, respectively).…”

Section: Introductionmentioning

confidence: 87%

“…The Parnaíba River catchment is one of the major drainage basins in northeastern Brazil, covering three different climatic classes according to a review of Köppen's classification (Figure ; Alvares et al, ): Bsh, semiarid; As, tropical with dry summer; and Aw, tropical with dry winter. Precipitation over northeastern South America is highly influenced by the meridional shifts of the Intertropical Convergence Zone (ITCZ) both on seasonal (Marengo & Bernasconi, ) and millennial timescales (Mulitza et al, ). Peak annual precipitation occurs during March/April when the ITCZ reaches its southernmost seasonal position (Hastenrath, ).…”

Section: Regional Settingmentioning

confidence: 99%

“…It was recently shown that TraCE‐21ka could accurately reproduce changes in precipitation over northeastern Brazil during the last deglaciation (Bouimetarhan et al, ; Mulitza et al, ). Thus, despite its limitations (Liu et al, ), we compare our new TL and OSL luminescence proxies as well as the previously available records for the same core ((ln (Fe/Ca); Zhang et al, ) and for a neighboring core ( n ‐alkane δD; Mulitza et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Thermoluminescence and Optically Stimulated Luminescence Measured in Marine Sediments Indicate Precipitation Changes Over Northeastern Brazil

Mendes

Sawakuchi

Chiessi

et al. 2019

Paleoceanog and Paleoclimatol

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Marine sediment cores offer a great number of proxies for reconstructions of past environmental conditions, such as ocean temperature, salinity, primary productivity, stratification of the upper water column, and continental precipitation. Up to date, continental precipitation archived in marine sediment cores is reconstructed based mainly on the hydrogen isotopic composition of plant‐wax compounds (i.e., n‐alkane δD) or on the ratio between terrigenous and marine sediments expressed as elemental ratios (e.g., ln (Fe/Ca)). Although these proxies provide reliable precipitation reconstructions, there are some inherent limitations, as plant‐wax δD application depends on the availability of n‐alkanes in marine sediments and elemental ratios can be influenced by other factors like the relative sea‐level, primary productivity, and postdepositional processes. Here we introduce new precipitation proxies based on optically stimulated luminescence and thermoluminescence signals of quartz and feldspar. The rationale is that when precipitation changes over the catchment through time, different sediment sources regarding weathering intensity and parent rock types are drained, supplying sediments with varying signals of luminescence to the ocean. We compared our new proxy records with records of well‐established proxies, for the same (ln (Fe/Ca)) and neighboring (n‐alkane δD) marine sediment cores. The comparison among all proxies as well as with a state‐of‐art transient climate model run (TraCE‐21ka) demonstrates that the new proxies accurately constrain precipitation changes over northeastern Brazil for the last 30,000 years. The main advantage of these new proxies relies on their fast response to precipitation changes over the continent. Furthermore, they are straightforward to measure and not expensive.

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Synchronous and proportional deglacial changes in Atlantic meridional overturning and northeast Brazilian precipitation

Cited by 122 publications

References 75 publications

Relative timing of precipitation and ocean circulation changes in the western equatorial Atlantic over the last 45 ky

Relative timing of precipitation and ocean circulation changes in the western equatorial Atlantic over the last 45 ky

Millennial‐ to Orbital‐Scale Responses of Western Equatorial Atlantic Thermocline Depth to Changes in the Trade Wind System Since the Last Interglacial

Thermoluminescence and Optically Stimulated Luminescence Measured in Marine Sediments Indicate Precipitation Changes Over Northeastern Brazil

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