Water mass circulation and weathering inputs in the Labrador Sea based on coupled Hf–Nd isotope compositions and rare earth element distributions

Filippova, A. S.; Kienast, Markus; Rickli, Jörg; Hathorne, Ed C; Yashayaev, Igor; Pahnke, Katharina

doi:10.1016/j.gca.2016.11.024

Cited by 29 publications

(28 citation statements)

References 101 publications

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“…The Labrador section was chosen according to the OSNAP (Overturning in the Subpolar North Atlantic Programme) recommendations because it transects the export route of the Labrador Sea Water downstream of its formation site. Therefore, the properties of the North Atlantic Deep Water (NADW) at 53 • N are likely to be representative of NADW further south and a 15-year time series of currents and hydrographic properties is available in the western boundary current at this latitude (Fischer et al, 2010). The GEOVIDE cruise took place from 15 May to 30 June 2014, during the same season as the previous OVIDE cruises (2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012).…”

Section: Strategymentioning

confidence: 99%

Introduction to the French GEOTRACES North Atlantic Transect (GA01): GEOVIDE cruise

Sarthou¹,

Lherminier²,

Achterberg³

et al. 2018

Biogeosciences

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Abstract. The GEOVIDE cruise, a collaborative project within the framework of the international GEOTRACES programme, was conducted along the French-led section in the North Atlantic Ocean (Section GA01), between 15 May and 30 June 2014. In this special issue (https://www.biogeosciences.net/special_issue900.html), results from GEOVIDE, including physical oceanography and trace element and isotope cyclings, are presented among 18 articles. Here, the scientific context, project objectives, and scientific strategy of GEOVIDE are provided, along with an overview of the main results from the articles published in the special issue.

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Section: Strategymentioning

confidence: 99%

Introduction to the French GEOTRACES North Atlantic Transect (GA01): GEOVIDE cruise

Sarthou¹,

Lherminier²,

Achterberg³

et al. 2018

Biogeosciences

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“…A longer residence time of Hf compared to Nd has been proposed based on relatively homogenous Hf isotope ratios across different ocean basins and its speciation in seawater [e.g., White et al, 1986;Godfrey et al, 2008]. However, more recently evidence emerged that Hafnium is more efficiently adsorbed to particles [Stichel et al, 2012a] and that its residence time in seawater is likely shorter than that of Nd [Rickli et al, 2009;Firdaus et al, 2011;Stichel et al, 2012a;Chen et al, 2013b;Filippova et al, 2017].…”

Section: Introductionmentioning

confidence: 99%

Glacial reduction of AMOC strength and long-term transition in weathering inputs into the Southern Ocean since the mid-Miocene: Evidence from radiogenic Nd and Hf isotopes

2017

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Combined seawater radiogenic hafnium (Hf) and neodymium (Nd) isotope compositions were extracted from bulk sediment leachates and foraminifera of Site 1088, Ocean Drilling Program Leg 177, 2082 m water depth on the Agulhas Ridge. The new data provide a continuous reconstruction of long‐ and short‐term changes in ocean circulation and continental weathering inputs since the mid‐Miocene. Due to its intermediate water depth, the sediments of this core sensitively recorded changes in admixture of North Atlantic Deep Water to the Antarctic Circumpolar Current as a function of the strength of the Atlantic Meridional Overturning Circulation (AMOC). Nd isotope compositions (εNd) range from −7 to −11 with glacial values generally 1 to 3 units more radiogenic than during the interglacials of the Quaternary. The data reveal episodes of significantly increased AMOC strength during late Miocene and Pliocene warm periods, whereas peak radiogenic εNd values mark a strongly diminished AMOC during the major intensification of Northern Hemisphere Glaciation near 2.8 Ma and in the Pleistocene after 1.5 Ma. In contrast, the Hf isotope compositions (εHf) show an essentially continuous evolution from highly radiogenic values of up to +11 during the Miocene to less radiogenic present‐day values (+2 to +4) during the late Quaternary. The data document a long‐term transition in dominant weathering inputs, where inputs from South America are replaced by those from Southern Africa. Moreover, radiogenic peaks provide evidence for the supply of radiogenic Hf originating from Patagonian rocks to the Atlantic sector of the Southern Ocean via dust inputs.

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“…Only one single 231 Pa profile in the Subpolar North Atlantic has been published before GEOVIDE (Moran et al, 2002). Regarding Nd isotopes, although several profiles of dissolved (and total) Nd isotopes are available in the boundary currents of Greenland and the Labrador Sea, there are very few profiles for the ocean interior of the GEOVIDE region (Copard et al, 2011;Filippova et al, 2017;Lacan and Jeandel, 2004;Lambelet et al, 2016). In addition, the importance of dissolved/particle interactions in the control of the isotopic composition of Nd is becoming increasingly apparent.…”

Section: /24mentioning

confidence: 99%

Introduction to the French GEOTRACES North Atlantic Transect (GA01): GEOVIDE cruise

Sarthou¹,

Lherminier²,

Achterberg³

et al. 2018

Preprint

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<p><strong>Abstract.</strong> The GEOVIDE cruise, a collaborative project within the framework of the international GEOTRACES programme, was conducted along the French-led section in the North Atlantic Ocean (Section GA01), between 15 May and 30 June 2014. In this Special Issue, results from GEOVIDE, including physical oceanography and trace element and isotope cyclings, are presented among seventeen articles. Here, the scientific context, project objectives and scientific strategy of GEOVIDE are provided, along with an overview of the main results from the articles published in the special issue.</p>

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Water mass circulation and weathering inputs in the Labrador Sea based on coupled Hf–Nd isotope compositions and rare earth element distributions

Cited by 29 publications

References 101 publications

Introduction to the French GEOTRACES North Atlantic Transect (GA01): GEOVIDE cruise

Introduction to the French GEOTRACES North Atlantic Transect (GA01): GEOVIDE cruise

Glacial reduction of AMOC strength and long-term transition in weathering inputs into the Southern Ocean since the mid-Miocene: Evidence from radiogenic Nd and Hf isotopes

Introduction to the French GEOTRACES North Atlantic Transect (GA01): GEOVIDE cruise

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