Late quaternary sea bottom conditions in the southern Panama basin, Eastern Equatorial Pacific

Patarroyo, Germán D.; Martínez, José I.

doi:10.1016/j.jsames.2015.07.010

Cited by 9 publications

(5 citation statements)

References 79 publications

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“…Chilostomella oolina is a deep infaunal species typifying dysoxic conditions (Jorissen et al., 1998; McGann & Conrad, 2018) with high productivity (N. Wang et al., 2018). Fursenkoina rotundata is an infaunal, dysoxic, opportunist species (Das et al., 2017), present in areas where there is significant organic matter influx associated with high surface productivity leading to low‐oxygen conditions (Patarroyo & Martínez, 2015). Globobulimina pacifica is also a low oxygen tolerant taxon (Ballesteros‐Prada, 2019; Bernhard et al., 1997; McGann & Conrad, 2018).…”

Section: Resultsmentioning

confidence: 99%

Linkages Between East China Sea Deep‐Sea Oxygenation and Variability in the East Asian Summer Monsoon and Kuroshio Current Over the Last 400,000 years

Vats

Singh

Das

et al. 2021

Paleoceanog and Paleoclimatol

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The East China Sea (ECS) seasonally receives a high organic input due to the terrestrial organic matter influx, which is controlled by the East Asian Summer Monsoon (EASM), and the increased productivity driven by upwelling of the subsurface Kuroshio Current (KC). Changes in benthic foraminiferal assemblage composition in combination with paleoceanographic proxy data (CaCO3 (%), TOC (%), δ13Cpf, and δ18Obf) are used to reconstruct bottom water oxygenation and organic export flux variability over the last 400 kyr in the ECS. Multivariate analyses of benthic foraminiferal census data identified six biofacies characteristic of varying environmental conditions. These results suggest that enhanced EASM precipitation and KC upwelling directly influenced organic export flux and bottom water oxygen content in the ECS. The ECS bottom water was suboxic during Marine Isotope Stage (MIS) 11 to 8; suboxic to dysoxic between MIS 7 and 6, strongly dysoxic between mid‐MIS 5 and 4, and exhibited high variability between MIS 3 and 1. Spectral analysis of relative abundances of representative genera Quinqueloculina (oxic), Bulimina (suboxic), and Globobulimina (dysoxic) reveals a robust 23 kyr signal, which we attribute to precessionally‐paced changes in surface productivity and bottom water oxygenation related to KC variability over the past 400 kyr.

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Section: Resultsmentioning

confidence: 99%

Linkages Between East China Sea Deep‐Sea Oxygenation and Variability in the East Asian Summer Monsoon and Kuroshio Current Over the Last 400,000 years

Vats

Singh

Das

et al. 2021

Paleoceanog and Paleoclimatol

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“…It is thus possible that a drier Amazon would decrease moisture transport to our site. Alternatively, the El Niño‐like conditions prevailing in the tropical Pacific during the Greenlandian–Northgrippian could have caused the dry conditions recorded in Colombia during this period (Patarroyo and Martínez, 2015).…”

Section: Resultsmentioning

confidence: 99%

“…It is thus possible that a drier Amazon would decrease moisture transport to our site. Alternatively, the El Niño-like conditions prevailing in the tropical Pacific during the Greenlandian-Northgrippian could have caused the dry conditions recorded in Colombia during this period (Patarroyo and Martínez, 2015). A period of wetter climates identified between 8910 and 8210 cal a BP could correspond to the global 8.2 event (Mayewski et al, 2004) but since this event has been poorly reported in Colombia and thus comparisons are limited, we will not discuss it further.…”

Section: Greenlandian-northgrippianmentioning

confidence: 99%

Late Pleistocene–Holocene environmental and climatic history of a freshwater paramo ecosystem in the northern Andes

Patiño

Vélez

Weber

et al. 2020

J Quaternary Science

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This study presents the first multi-proxy palaeoenvironmental and palaeoclimatic history for northern South America based on the palaeolimnological reconstruction of a pond located in a dry paramo at 3570 masl. During the Last Glacial Maximum (LGM), the study area was under glacial conditions, then during global events Heinrich Stadial 1 (HS1), Bølling-Allerød (BA), and the Younger Dryas (YD), the pond expanded, accumulation rates and proxies for erosion reached the highest values, indicative of humid conditions, with maxima in humidity during the BA and YD. Dry conditions and pond desiccation occurred in the Greenlandian-Northgrippian and by 6010 cal a BP the area was transformed into the mire of today. Comparisons with records from other sites in South America indicate that changes in humidity are most likely controlled by the Intertropical Convergence Zone, mainly during the glacial and postglacial, and by changes in the Pacific Ocean, more pronounced after the YD.

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“…Chilostomella oolina is a deep infaunal species typifying dysoxic conditions (Jorissen et al, 1998;McGann & Conrad, 2018) with high productivity (N. Wang et al, 2018). Fursenkoina rotundata is an infaunal, dysoxic, opportunist species (Moumita Das et al, 2017), present in areas where there is significant organic matter influx associated with high surface productivity leading to low-oxygen conditions (Patarroyo & Martínez, 2015). Globobulimina pacifica is also a low oxygen tolerant taxon (Ballesteros-Prada, 2019; Bernhard et al, 1997;McGann & Conrad, 2018).…”

Section: Author Manuscriptmentioning

confidence: 99%

Linkages between East China Sea Deep-sea Oxygenation and the Variability of the East Asian Summer Monsoon and Kuroshio Current over last 400,000 years

Vats

Singh

Das

et al. 2021

Preprint

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The East China Sea (ECS) seasonally receives a high organic input due to the terrestrial organic matter influx, which is controlled by the East Asian Summer Monsoon (EASM), and the increased productivity driven by upwelling of the subsurface Kuroshio Current (KC). Changes in benthic foraminiferal assemblage composition in combination with paleoceanographic proxy data (CaCO3 (%), TOC (%), δ 13 Cpf, and δ 18 Obf) are used to reconstruct bottom water oxygenation and organic export flux variability over the last 400 kyr in the ECS. Multivariate analyses of benthic foraminiferal census data identified six biofacies characteristic of varying environmental conditions. These results suggest that enhanced EASM precipitation and KC upwelling directly influenced organic export flux and bottom water oxygen content in the ECS. The ECS bottom water was suboxic during Marine Isotope Stage (MIS) 11 to 8; suboxic to dysoxic between MIS 7 and 6, strongly dysoxic between mid-MIS 5 and 4, and exhibited high variability between MIS 3 and 1. Spectral analysis of relative abundances of representative genera Quinqueloculina (oxic), Bulimina (suboxic), and Globobulimina (dysoxic) reveals a robust 23 kyr signal, which we attribute to precessionally-paced changes in surface productivity and bottom water oxygenation related to KC variability over the past 400 kyr.

show abstract

Late quaternary sea bottom conditions in the southern Panama basin, Eastern Equatorial Pacific

Cited by 9 publications

References 79 publications

Linkages Between East China Sea Deep‐Sea Oxygenation and Variability in the East Asian Summer Monsoon and Kuroshio Current Over the Last 400,000 years

Linkages Between East China Sea Deep‐Sea Oxygenation and Variability in the East Asian Summer Monsoon and Kuroshio Current Over the Last 400,000 years

Late Pleistocene–Holocene environmental and climatic history of a freshwater paramo ecosystem in the northern Andes

Linkages between East China Sea Deep-sea Oxygenation and the Variability of the East Asian Summer Monsoon and Kuroshio Current over last 400,000 years

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