The biogeochemical impact of glacial meltwater from Southwest Greenland

Hendry, KR, Huvenne, VAI, Robinson, LF, Annett, A, Badger, M, Jacobel, AW, Ng, HC, Opher, J, Pickering, RA, Taylor, ML, Bates, SL, Cooper, A, Cushman, GG, Goodwin, C, Hoy, S, Rowland, G, Samperiz, A, Williams, JA, Achterberg, EP, Arrowsmith, C, Alexander Brearley, J, Henley, SF, Krause, JW, Leng, MJ, Li, T, McManus, JF, Meredith, MP, Perkins, R and Woodward, EMS 2019 The biogeochemical impact of glacial meltwater from Southwest Greenland. Progress in Oceanography, 176. 102126. https://doi.org/10.1016/j.pocean.2019.102126

Text Hendry et al_Published paper 2019.pdf - Published Version Restricted to Registered users only Available under License All Rights Reserved. Download (13MB)

Abstract/Summary

Biogeochemical cycling in high-latitude regions has a disproportionate impact on global nutrient budgets. Here, we introduce a holistic, multi-disciplinary framework for elucidating the influence of glacial meltwaters, shelf currents, and biological production on biogeochemical cycling in high-latitude continental margins, with a focus on the silica cycle. Our findings highlight the impact of significant glacial discharge on nutrient supply to shelf and slope waters, as well as surface and benthic production in these regions, over a range of timescales from days to thousands of years. Whilst biological uptake in fjords and strong diatom activity in coastal waters maintains low dissolved silicon concentrations in surface waters, we find important but spatially heterogeneous additions of particulates into the system, which are transported rapidly away from the shore. We expect the glacially-derived particles – together with biogenic silica tests – to be cycled rapidly through shallow sediments, resulting in a strong benthic flux of dissolved silicon. Entrainment of this benthic silicon into boundary currents may supply an important source of this key nutrient into the Labrador Sea, and is also likely to recirculate back into the deep fjords inshore. This study illustrates how geochemical and oceanographic analyses can be used together to probe further into modern nutrient cycling in this region, as well as the palaeoclimatological approaches to investigating changes in glacial meltwater discharge through time, especially during periods of rapid climatic change in the Late Quaternary.

Item Type:	Publication - Article
Additional Keywords:	Biogeochemistry Nutrients Glaciers Primary production Silica cycling
Divisions:	Plymouth Marine Laboratory > Science Areas > Marine Biochemistry and Observations
Depositing User:	S Hawkins
Date made live:	24 Mar 2020 10:37
Last Modified:	25 Apr 2020 10:02
URI:	https://plymsea.ac.uk/id/eprint/8902

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