Mediterranean outflow strengthening during northern hemisphere coolings: A salt source for the glacial Atlantic?

Voelker, Antje H L; Lebreiro, Susana Martin; Schönfeld, Joachim; Cacho, Isabel; Erlenkeuser, Helmut; Abrantes, Fatima F

doi:10.1016/j.epsl.2006.03.014

Cited by 261 publications

(349 citation statements)

References 74 publications

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“…The development and evolution of this part of the Gulf of Cadiz margin has been controlled since the Late Messinian by the exchange of water masses through the Strait of Gibraltar, also affected by c1imatic cycles and tectonic events (e.g. Kenyon and Belderson, 1973;Llave et al, 2006;Voelker et al, 2006;Medialdea et al, 2009;León et al, 2010). We present a complete characterisation of these deposits based on a broad dataset that has led us to propose a genetic and evolutionary model Iinked to the mud volcanism-diapirism and palaeoceanographic evolution of the CCC, thus increasing knowledge about the interpretation of environmental changes.…”

Section: Abstraetmentioning

confidence: 99%

Ferromanganese nodules and micro-hardgrounds associated with the Cadiz Contourite Channel (NE Atlantic): Palaeoenvironmental records of fluid venting and bottom currents

et al. 2012

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Section: Abstraetmentioning

confidence: 99%

Ferromanganese nodules and micro-hardgrounds associated with the Cadiz Contourite Channel (NE Atlantic): Palaeoenvironmental records of fluid venting and bottom currents

et al. 2012

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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%

“…This exchange plays an important role for regional and global climate in two respects. First, the injection of warm and salty MOW into the North Atlantic contributes to deep-water formation at high latitudes and thus to the dynamics of the ocean-climate system (Bryden and Kinder, 1991;Ivanovic et al, 2014;Reid, 1979;Rogerson et al, 2012;Voelker et al, 2006). Second, the eastward Atlantic inflow has been considered a freshwater sink for the North Atlantic since less saline North Atlantic Central Water is replaced with saltier MOW (Rogerson et al, 2010).…”

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%

“…Mediterranean-Atlantic exchange plays an important role for regional and global climate in two respects. First, the injection of warm and salty MOW into the North Atlantic contributes to deep water formation at high latitudes, and thus to the dynamics of the ocean-climate system (Bryden and Kinder, 1991;Ivanovic et al, 2014;Reid, 1979;40 Rogerson et al, 2012;Voelker et al, 2006). Second, the eastward Atlantic inflow has been considered a freshwater sink for the North Atlantic since less saline North Atlantic Central Water is replaced with saltier MOW (Rogerson et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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

García-Gallardo¹,

Grunert²,

Piller³

2017

Preprint

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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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Mediterranean outflow strengthening during northern hemisphere coolings: A salt source for the glacial Atlantic?

Cited by 261 publications

References 74 publications

Ferromanganese nodules and micro-hardgrounds associated with the Cadiz Contourite Channel (NE Atlantic): Palaeoenvironmental records of fluid venting and bottom currents

Ferromanganese nodules and micro-hardgrounds associated with the Cadiz Contourite Channel (NE Atlantic): Palaeoenvironmental records of fluid venting and bottom currents

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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