Nicholson, Sarah-AnneLévy, MLlort, JSwart, SMonteiro, Pedro MS2018-02-262018-02-262016-09Nicholson, S-A. et al. 2016. Investigation into the impact of storms on sustaining summer primary productivity in the Sub-Antarctic Ocean. Geophysical Research Letters, vol. 43(17): 9192-91990094-8276DOI: 10.1002/2016GL069973http://onlinelibrary.wiley.com/doi/10.1002/2016GL069973/fullhttp://hdl.handle.net/10204/10065Article published in Geophysical Research Letters, vol. 43(17): 9192-9199In the Sub-Antarctic Ocean elevated phytoplankton biomass persists through summer at a time when productivity is expected to be low due to iron limitation. Biological iron recycling has been shown to support summer biomass. In addition, we investigate an iron supply mechanism previously unaccounted for in iron budget studies. Using a 1-D biogeochemical model, we show how storm-driven mixing provides relief from phytoplankton iron limitation through the entrainment of iron beneath the productive layer. This effect is significant when a mixing transition layer of strong diffusivities (kz > 10−4 m2 s−1) is present beneath the surface-mixing layer. Such subsurface mixing has been shown to arise from interactions between turbulent ocean dynamics and storm-driven inertial motions. The addition of intraseasonal mixing yielded increases of up to 60% in summer primary production. These results stress the need to acquire observations of subsurface mixing and to develop the appropriate parameterizations of such phenomena for ocean-biogeochemical models.enControl runsSXLD Deepening RunsSub-Antarctic OceanSurface-mixing layerSubsurface Mixing RunsArticleNicholson, S., Lévy, M., Llort, J., Swart, S., & Monteiro, P. M. (2016). Investigation into the impact of storms on sustaining summer primary productivity in the Sub-Antarctic Ocean. http://hdl.handle.net/10204/10065Nicholson, Sarah-Anne, M Lévy, J Llort, S Swart, and Pedro MS Monteiro "Investigation into the impact of storms on sustaining summer primary productivity in the Sub-Antarctic Ocean." (2016) http://hdl.handle.net/10204/10065Nicholson S, Lévy M, Llort J, Swart S, Monteiro PM. Investigation into the impact of storms on sustaining summer primary productivity in the Sub-Antarctic Ocean. 2016; http://hdl.handle.net/10204/10065.TY - Article AU - Nicholson, Sarah-Anne AU - Lévy, M AU - Llort, J AU - Swart, S AU - Monteiro, Pedro MS AB - In the Sub-Antarctic Ocean elevated phytoplankton biomass persists through summer at a time when productivity is expected to be low due to iron limitation. Biological iron recycling has been shown to support summer biomass. In addition, we investigate an iron supply mechanism previously unaccounted for in iron budget studies. Using a 1-D biogeochemical model, we show how storm-driven mixing provides relief from phytoplankton iron limitation through the entrainment of iron beneath the productive layer. This effect is significant when a mixing transition layer of strong diffusivities (kz > 10−4 m2 s−1) is present beneath the surface-mixing layer. Such subsurface mixing has been shown to arise from interactions between turbulent ocean dynamics and storm-driven inertial motions. The addition of intraseasonal mixing yielded increases of up to 60% in summer primary production. These results stress the need to acquire observations of subsurface mixing and to develop the appropriate parameterizations of such phenomena for ocean-biogeochemical models. DA - 2016-09 DB - ResearchSpace DP - CSIR KW - Control runs KW - SXLD Deepening Runs KW - Sub-Antarctic Ocean KW - Surface-mixing layer KW - Subsurface Mixing Runs LK - https://researchspace.csir.co.za PY - 2016 SM - 0094-8276 T1 - Investigation into the impact of storms on sustaining summer primary productivity in the Sub-Antarctic Ocean TI - Investigation into the impact of storms on sustaining summer primary productivity in the Sub-Antarctic Ocean UR - http://hdl.handle.net/10204/10065 ER -