Benthic foraminifera-based reconstruction of the first Mediterranean-Atlantic exchange in the early Pliocene Gulf of Cadiz

García-Gallardo, Ángela; Grunert, Patrick; Schee, Marlies van der; Sierro, Francisco J.; Jiménez-Espejo, Francisco Jose; Zarikian, C.A. Alvarez; Piller, Werner E.

doi:10.1016/j.palaeo.2017.02.009

Cited by 21 publications

(12 citation statements)

References 79 publications

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“…3 – 5 ) and the converted DO values (Eq. 6 ) on a Pliocene dataset (50 samples) of Garcia-Gallardo 81 , a Miocene dataset (310 samples) derived of 52 wells of the Austrian Vienna Basin of Kranner 71 and an Oligocene dataset (33 samples) of Rupp and Ćorić 82 , all results are given in the Supplementary Table S2 . These datasets were chosen to show the potential of our new formulas for fossil datasets, which fit well with the detailed reconstructions of paleoecological conditions by the authors.…”

Section: Resultsmentioning

confidence: 99%

“…These datasets were chosen to show the potential of our new formulas for fossil datasets, which fit well with the detailed reconstructions of paleoecological conditions by the authors. Garcia-Gallardo 81 describes the Pliocene sediments they investigated as generally low oxic. Rupp and Ćorić 82 also describe generally low oxic conditions with reoccurring extreme oxygen crises and Kranner 71 provides a dataset with variable oxygenation, from high oxic to suboxic.…”

Section: Resultsmentioning

confidence: 99%

“…To achieve this, comprehensive revision of the formula was necessary and calibrations were conducted on the original dataset of Kaiho 29 and seven recent datasets of Piller and Haunold 76 , Schuhmacher 30 , Kaminski 33 , Ama 77 , Charrieu 78 , 79 , Groenevelt 80 . Furthermore, we combined these modern datasets with additional fossil datasets of the Paleocene 81 , the Oligocene 82 and the Miocene 71 in order to create an enhanced BFOI (EBFOI) calculation and to provide a transfer function to convert EBFOI values to DO values [ml/l] directly.…”

Section: Introductionmentioning

confidence: 99%

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Calculating dissolved marine oxygen values based on an enhanced Benthic Foraminifera Oxygen Index

Kranner

Harzhauser

Beer³

et al. 2022

Sci Rep

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Marine oxygen minimum zones (OMZs) trap greenhouse gases, reduce livable habitats, a critical factor for these changes is the amount of dissolved oxygen (DO). The frequently used tool to reconstruct DO values, the Benthic Foraminifera Oxygen Index (BFOI), showed major shortcomings and lacks effectiveness. Therefore, we enhanced the BFOI and introduce enhanced BFOI (EBFOI) formulas by using all available data benthic foraminifers provide, calculating the whole livable habitat of benthic foraminifers, including bottom water oxygenation (BWO) and pore water oxygenation (PWO). Further, we introduce for the first time a transfer function to convert EBFOI vales directly into DO values, increasing efficiency by up to 38%. All formulas are calibrated on modern samples and applied to fossil datasets. Our new approach provides a major improvement in defining and reconstructing marine oxygen levels and eutrophication, by, providing a new toolset for understanding past changes and tracking actual and predicted future expanding OMZs.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Calculating dissolved marine oxygen values based on an enhanced Benthic Foraminifera Oxygen Index

Kranner

Harzhauser

Beer³

et al. 2022

Sci Rep

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“…García-Gallardo et al: Mediterranean-Atlantic exchange across the late Pliocene climate transition Kaboth et al, 2016;Voelker et al, 2006) but has neglected the Atlantic surface water component (Rogerson et al, 2010). Furthermore, there are a number of studies on Mediterranean-Atlantic exchange during the earlymid Pliocene and early Pleistocene (e.g., Bahr et al, 2015;García-Gallardo et al, 2017;Grunert et al, 2017;Kaboth et al, 2017;Khélifi et al, 2009Khélifi et al, , 2014Van der Schee et al, 2016;Voelker et al, 2015), leaving a gap in our knowledge about the late Pliocene climate transition comprising the mid-Pliocene warm period (MPWP) and the initiation of the Northern Hemisphere glaciation (NHG).…”

Section: Introductionmentioning

confidence: 99%

Variations in Mediterranean–Atlantic exchange across the late Pliocene climate transition

2018

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Abstract. Mediterranean-Atlantic exchange through the Strait of Gibraltar plays a significant role in the global oceanclimate dynamics in two ways. On one side, the injection of the saline and warm Mediterranean Outflow Water (MOW) contributes to North Atlantic deep-water formation. In return, the Atlantic inflow is considered a sink of less saline water for the North Atlantic Ocean. However, while the history of MOW is the focus of numerous studies, the Pliocene Atlantic inflow has received little attention so far. The present study provides an assessment of the Mediterranean-Atlantic exchange with a focus on the Atlantic inflow strength and its response to regional and global climate from 3.33 to 2.60 Ma. This time interval comprises the mid-Pliocene warm period (MPWP; 3.29-2.97 Ma) and the onset of the Northern Hemisphere glaciation (NHG). For this purpose, gradients in surface δ 18 O records of the planktonic foraminifer Globigerinoides ruber between the Integrated Ocean Drilling Program (IODP) Hole U1389E (Gulf of Cádiz) and Ocean Drilling Program (ODP) Hole 978A (Alboran Sea) have been evaluated. Interglacial stages and warm glacials of the MPWP revealed steep and reversed (relative to the present) W-E δ 18 O gradients suggesting a weakening of MediterraneanAtlantic exchange likely caused by high levels of relative humidity in the Mediterranean region. In contrast, periods of stronger inflow are indicated by flat δ 18 O gradients due to more intense arid conditions during the severe glacial Marine Isotope Stage (MIS) M2 and the initiation of NHG (MIS G22, G14, G6-104). Intensified Mediterranean-Atlantic exchange in cold periods is linked to the occurrence of icerafted debris (IRD) at low latitudes and a weakening of the Atlantic Meridional Overturning Circulation (AMOC). Our results thus suggest the development of a negative feedback between AMOC and exchange rates at the Strait of Gibraltar in the latest Pliocene as it has been proposed for the late Quaternary.

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“…Bryden and Stommel, 1982;Hernández-Molina et al, 2014;Iorga and Lozier, 1999;Kaboth et al, 2016;Voelker et al, 2006) but has neglected the Atlantic surface water component (Rogerson et al, 2010). Furthermore, there are a number of studies on Mediterranean-Atlantic exchange during the early-mid Pliocene and early Pleistocene (e.g., Bahr et al, 2015;García-Gallardo et al, 2017;Grunert et al, 2017;Hernández-Molina 50 et al, 2014;Kaboth et al, 2017;Khélifi et al 2009Khélifi et al , 2014Van der Schee et al, 2016;Voelker et al, 2015) leaving a gap in our knowledge about the late Pliocene climate transition comprising the mid-Pliocene warm period (MPWP) and the initiation of the Northern Hemisphere Glaciation (NHG).…”

Section: Introductionmentioning

confidence: 99%

Variations of Mediterranean–Atlantic exchange across the late Pliocene climate transition

García-Gallardo¹,

Grunert²,

Piller³

2017

Preprint

Self Cite

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Abstract. Mediterranean-Atlantic exchange through the Strait of Gibraltar plays a significant role in the global ocean-climate dynamics in two ways. On one side, the injection of the saline and warm 10 Mediterranean Outflow Water (MOW) contributes to North Atlantic deep-water formation. In return, the Atlantic inflow is considered a sink of less saline water for the North Atlantic Ocean. However, while the history of MOW is the focus of numerous studies, the latter has received little attention so far. The present study provides an assessment of the Mediterranean-Atlantic exchange with focus on the

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Benthic foraminifera-based reconstruction of the first Mediterranean-Atlantic exchange in the early Pliocene Gulf of Cadiz

Cited by 21 publications

References 79 publications

Calculating dissolved marine oxygen values based on an enhanced Benthic Foraminifera Oxygen Index

Calculating dissolved marine oxygen values based on an enhanced Benthic Foraminifera Oxygen Index

Variations in Mediterranean–Atlantic exchange across the late Pliocene climate transition

Variations of Mediterranean–Atlantic exchange across the late Pliocene climate transition

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