Aeolian particles in marine cores as a tool for quantitative high-resolution reconstruction of upwelling favorable winds along coastal Atacama Desert, Northern Chile

Flores‐Aqueveque, Valentina; Alfaro, Stéphane C.; Vargas, Gabriel; Rutllant, José A.; Caquineau, Sandrine

doi:10.1016/j.pocean.2015.02.003

Cited by 18 publications

(9 citation statements)

References 49 publications

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“…In the vicinity of desert areas, where wind-blown transport prevails, particles with grain size as high as ∼ 100 µm can accumulate in marine sediments (e.g., Flores-Aqueveque et al, 2015;Stuut et al, 2007) or even in lacustrine sediments (An et al, 2012). Indeed, Stuut et al (2007) reported the presence of distributions typical of wind-blown particles with ∼ 80 µm grain size (∼ 29 • S North Chile), which is consistent with our results.…”

Section: Basis For Interpretationsupporting

confidence: 91%

“…1b). Regional winds can also be affected at interannual timescales by El Niño-Southern Oscillation (ENSO) variability (i.e., enhanced or weakened during La Niña and El Niño events, respectively), as well as by the Pacific Decadal Oscillation (PDO) at decadal timescales (Flores-Aqueveque et al, 2015). These factors also affect the inputs of terrigenous material to the Peruvian continental shelf.…”

Section: Introductionmentioning

confidence: 99%

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Terrigeneous material supply to the Peruvian central continental shelf (Pisco 14° S) during the last 1100 yr: paleoclimatic implications

Zuluaga¹,

Sifeddine²,

Caquineau³

et al. 2015

Preprint

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Abstract. In the Eastern Pacific, lithogenic input to the ocean is a response of the atmospheric and ocean system variability and their teleconnections over different timescales. Atmospheric (e.g., wind fields, precipitation), hydrological (e.g., fresh water plumes) and oceanic (e.g., currents) conditions determine the transport mode and the amount of lithogenic material transported from the continent to the continental shelf. Here, we present the grain size distribution of a composite record of two laminated sediment cores retrieved in the Peruvian continental shelf, covering the last ~1100 yr at sub-decadal to centennial time-series resolution. We then discuss the paleo-environmental significance and the climatic mechanisms involved. Four grain size modes were identified. Two are linked to aeolian inputs (M3: 53.0 μm and M4: 90.8 μm on average), the third is interpreted as a marker of sediment discharge (M2: 9.4 μm on average), and the last is without an associated origin (M1: ~3 μm). The coarsest components (M3 and M4) dominated during the Medieval Climate Anomaly (MCA) and Current Warm Period (CWP) periods, suggesting that aeolian transport increased as consequence of wind stress intensification. In contrast, M2 displays an opposite behavior, exhibiting an increase in fluvial terrigenous input during the Little Ice Age (LIA), in response to more humid conditions. Comparison with other South American paleoclimate records indicates that the observed changes are driven by interactions between meridional displacement of the Intertropical convergence zone (ITCZ) and of the South Pacific Sub-tropical High (SPSH) at decadal and centennial time scales.

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Section: Basis For Interpretationsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Terrigeneous material supply to the Peruvian central continental shelf (Pisco 14° S) during the last 1100 yr: paleoclimatic implications

Zuluaga¹,

Sifeddine²,

Caquineau³

et al. 2015

Preprint

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“…Previous studies in South Eastern Pacific used the abundance and fluxes of coarse particles (~ 36-100 μm) in marine sediments as a proxy for wind intensity linked to the expansion/contraction of the SPSH (e.g., Flores-Aqueveque et al, 2015;Briceño-Zuluaga et al, 2016). Based on HYSPLIT (Hybrid Single-Particle Lagrangian Integrated Trajectory) simulations, Briceño-Zuluaga et al (2017) showed that coarse particles (50-90 μm) can directly reach the continental shelf in Pisco during Paracas storms (characterized by wind velocities surpassing 10-15 m/s).…”

Section: Assignment Of End-membersmentioning

confidence: 99%

Millennial variability of terrigenous transport to the central-southern Peruvian margin during the last deglaciation (18–13 kyr BP)

Yseki

Turcq

Caquineau

et al. 2022

Preprint

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Abstract. Reconstructing precipitation and wind from the geological record could help to understand the potential changes in precipitation and wind dynamics in response to climate change in Peru. The last deglaciation offers natural experimental conditions to test precipitation and wind dynamics response to high latitude forcing. While considerable research has been done to reconstruct precipitation variability during the last deglaciation in the Atlantic sector of South America, the Pacific sector of South America has received little attention. This work aims to fill this gap by reconstructing types of terrigenous transport to the central-southern Peruvian margin (12° S and 14º S) during the last deglaciation (18–13 kyr BP). For this purpose, we used grain-size distribution in sediments of marine core M77/2-005-3 (Callao, 12º S) and G14 (Pisco, 14º S). We analyzed end-members (EM) to identify grain-size components and reconstruct potential sources and transport processes of terrigenous material across time. We identified four end-members for both Callao and Pisco sediments. In Callao, we propose that changes in EM4 (101 μm) and EM2 (58 μm) contribution mainly reflect hydrodynamic energy and diffuse sources, respectively, while EM3 (77 um) and EM1 (11 μm) variations reflect changes in aeolian and fluvial inputs, respectively. In Pisco, changes in the contribution of EM1 (10 μm) reflect changes in river inputs while EM2 (52 μm), EM3 (75 μm) and EM4 (94 μm) reflect an aeolian origin linked to surface winds. At millennial-scale, our record shows an increase of the fluvial inputs during the last part of Heinrich Stadial 1 (~ 16–14.7 kyr BP) at both locations. This increase was linked to higher precipitation in Andes related to a reduction of the Atlantic Meridional Overturning Circulation and meltwater discharge in North Atlantic. In contrast, during Bølling-Allerød (~ 14.7–13 kyr BP), there was an aeolian input increase, associated with stronger winds and lower precipitation that indicate an expansion of the South Pacific Subtropical High. These conditions would correspond to a northern displacement of the Intertropical Convergence Zone-South Subtropical High system associated with a stronger Walker circulation. Our results suggest that variations in river discharge and changes in surface wind intensity in the western margin of South America during the last deglaciation were sensitive to Atlantic Meridional Overturning Circulation variations and Walker circulation on millennial timescales. In the context of global warming, large-scale precipitation and fluvial discharge increases in the Andes related to Atlantic Meridional Overturning Circulation decline and southward displacement of the Intertropical Convergence Zone should be considered.

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“…Different paleoclimate studies have linked changes of the ITCZ-SPSH system to variations in the SPSH (Sifeddine et al, 2008, Gutiérrez et al, 2009, Briceño-Zuluaga et al, 2016, Fleury et al, 2015, Flores-Aqueveque et al, 2015. To evaluate the role of the ITCZ on SPSH changes, we analyze the position of the ITCZ during the three considered periods.…”

Section: The Link Between the Itcz And Spsh Changesmentioning

confidence: 99%

South Pacific Subtropical High from the late Holocene to the end of the 21st century: insights from climate proxies and general circulation models

Flores‐Aqueveque¹,

Rojas²,

Aguirre³

et al. 2019

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Abstract. The South Pacific Subtropical High (SPSH) is a predominant feature of South American climate. The variability of this high-pressure center induces changes in the intensity of coastal alongshore winds and precipitation, among others, over southwestern South America. In recent decades, a strengthening and expansion of the SPSH have been observed and attributed to the current global warming. These changes have led an intensification of the southerly winds along the coast of northern to central Chile, and a decrease in precipitation from central to southern Chile. Motivated by improving our understanding about the regional impacts of climate change in this part of the Southern Hemisphere, we analyze SPSH changes during the two most extreme climate events of the last millennium: the Little Ice Age (LIA) and the Current Warm Period (CWP: 1970–2000), based on paleoclimate records and CMIP5/PMIP3 model simulations. In order to assess the level of agreement of general circulation models, we also compare them with ERA-Interim reanalysis data for the 1979–2009 period as a complementary analysis. Finally, with the aim of evaluating future SPSH behaviour, we include 21th century projections under a RCP8.5 scenario in our analyses. Our results indicate that during the relative warm (cold) period, the SPSH expands (contracts). Together with this change, alongshore winds intensify (weaken) south (north) of ~ 35º S; also, Southern Westerly Winds become stronger (weaker) and shift southward (northward). Model results generally underestimate reanalysis data. These changes are in good agreement with paleoclimate records, which suggest that these variations could be related to tropical climate dynamics but also to extratropical phenomena. However, although models adequately represent most of the South American climate changes, they fail in representing the Intertropical Convergence Zone - Hadley Cell system dynamics. Climate model projections indicate that changes recently observed will continue during next decades, highlighting the need to establish effective mitigation and adaptation strategies against their environmental and socio-economic impacts.

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Aeolian particles in marine cores as a tool for quantitative high-resolution reconstruction of upwelling favorable winds along coastal Atacama Desert, Northern Chile

Cited by 18 publications

References 49 publications

Terrigeneous material supply to the Peruvian central continental shelf (Pisco 14° S) during the last 1100 yr: paleoclimatic implications

Terrigeneous material supply to the Peruvian central continental shelf (Pisco 14° S) during the last 1100 yr: paleoclimatic implications

Millennial variability of terrigenous transport to the central-southern Peruvian margin during the last deglaciation (18–13 kyr BP)

South Pacific Subtropical High from the late Holocene to the end of the 21st century: insights from climate proxies and general circulation models

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