2019
DOI: 10.1016/j.epsl.2018.10.004
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Beryllium isotope signatures of ice shelves and sub-ice shelf circulation

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Cited by 25 publications
(28 citation statements)
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“…In the model used in Laufkötter et al (2018), a different relationship could explain the differences in the C export. While low at the scale of the SO in our model, the fertilization effect of the AIS on primary productivity and C export can be regionally significant as estimated from data (Smith et al, 2007;Duprat et al, 2016;Herraiz-Borreguero et al, 2016;Wu and Hou, 2017). For instance, in the highly fertilized area of the Atlantic plume, northeast of the Antarctic Peninsula (36-56 • W, 58-63 • S), primary production and C export are increased by ∼ 30 % and ∼ 42 %, respectively, in the SOLUB10 experiment compared to the CTL experiment (Table 3), i.e., 5 to 6 times higher than at the scale of the whole SO.…”
Section: Referencesmentioning
confidence: 87%
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“…In the model used in Laufkötter et al (2018), a different relationship could explain the differences in the C export. While low at the scale of the SO in our model, the fertilization effect of the AIS on primary productivity and C export can be regionally significant as estimated from data (Smith et al, 2007;Duprat et al, 2016;Herraiz-Borreguero et al, 2016;Wu and Hou, 2017). For instance, in the highly fertilized area of the Atlantic plume, northeast of the Antarctic Peninsula (36-56 • W, 58-63 • S), primary production and C export are increased by ∼ 30 % and ∼ 42 %, respectively, in the SOLUB10 experiment compared to the CTL experiment (Table 3), i.e., 5 to 6 times higher than at the scale of the whole SO.…”
Section: Referencesmentioning
confidence: 87%
“…Nutrient limitation may occur locally along the Antarctic coast; however, high levels of primary productivity in spring and summer are observed in large regions such as in the numerous coastal polynyas present in the SO (Arrigo and van Dijken, 2003;Arrigo et al, 2015). This possible biased behavior of our model may result from missing, misrepresented processes or sources that may supply macronutrients in the mixed layer such as the oceanic circulation in ice shelf cavities (Jacobs et al, 2011;Herraiz-Borreguero et al, 2015;White et al, 2019) or the melting of ice shelf and ice sheet (Pritchard et al, 2012;Arrigo et al, 2015Arrigo et al, , 2017Hawkings et al, 2015;Wadham et al, 2016;St-Laurent et al, 2017). Another process that can be advocated is the entrainment of nutrient-rich waters by subglacial discharge plumes induced by basal melting of grounded glaciers, a physical mixing process observed in the western Antarctic Peninsula (Cape et al, 2019) and for Greenland glaciers (Meire et al, 2017;Hopwood et al, 2018;Kanna et al, 2018).…”
Section: Model Caveats and Uncertaintiesmentioning
confidence: 97%
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“…Cosmogenic 10 Be is produced at an essentially constant rate in the upper atmosphere by cosmic radiation, and is transferred to the surface ocean by precipitation, where it is quickly adsorbed to terrigenous clay and other particles, that rain out to the seafloor. One complicating factor is that radiogenic beryllium is adsorbed to diatom frustules 103 and so its signature in sub-ice-shelf sediment can also relate to lateral transport from areas of open water directly in front of an ice shelf 104 . More recent work 104 suggests that the HCl-extractable 10 Be/ 9 Be ratio might provide a more robust discrimination of sediment deposited in open marine and sub-ice shelf settings, as this can help distinguish between the various pathways of Be.…”
Section: Signature Of Ice Shelf Collapsementioning
confidence: 99%
“…Original methods based on Tessier et al 24 used a solution of hydroxylamine hydrochloride (NH 2 OH.HCl) in acetic acid (15 to 25%) with a range of concentrations (0.04 to 1 M) at room or high (80 to 95°C) temperature 2,11,25,26 on ~1 g of sample, but ranging from 0.1 to >2 g depending on availability. Alternatively, a solution of hydrogen peroxide (H 2 O 2 ) and/or 0.5 to 6 M hydrochloric acid (HCl) has been utilised 2,14,18,27 …”
Section: Introductionmentioning
confidence: 99%