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Articles by Ilker Fer
A quantitative comparison of the physical supply and biological uptake of new nitrogen in the Arctic Ocean
Abstract Nitrogen constrains biomass across the Arctic Ocean, with nitrate (NO3) supply to the surface waters fuelling new primary production and net carbon drawdown. In this Review, we explore the physical mechanisms driving NO3 fluxes to the euphotic zone across the Arctic Ocean and how biological processes respond. The volume and inflow depth of Atlantic and Pacific Ocean waters, together with sea ice and halocline dynamics, govern internal physical mixing of NO3.
Warm rings in mesoscale eddies in a cold straining ocean - Nature Communications
Turbulence Observations below Drifting Sea Ice: TKE Production and Dissipation in the Meltwater-Influenced Boundary Layer
Keywords: Arctic; Sea ice; Turbulence; Boundary layer; Mixing; Summer/warm season 1. Introduction The main pathway of heat and momentum transfer between ice and ocean is through the turbulent ice–ocean boundary layer (IOBL). During summer, turbulence is driven by the ice–ocean boundary stress, τio, due to the differential motion of sea ice and the underlying ocean.
Turbulence Observations Below Drifting Sea Ice: TKE Production and Dissipation in the Meltwater-Influenced Boundary Layer
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ATOMIX benchmark datasets for dissipation rate measurements using shear probes - Scientific Data
Abstract Turbulent mixing in the ocean, lakes and reservoirs facilitates the transport of momentum, heat, nutrients, and other passive tracers. Turbulent fluxes are proportional to the rate of turbulent kinetic energy dissipation per unit mass, ε. A common method for ε measurements is using microstructure profilers with shear probes. Such measurements are now widespread, and a non-expert practitioner will benefit from best practice guidelines and benchmark datasets.
Validating Finescale Parameterizations for the Eastern Arctic Ocean Internal Wave Field
1 Introduction Mixing processes play a central role in shaping the Arctic Ocean's water masses and circulation (e.g., Holloway & Proshutinsky, 2007; Lenn et al., 2022; Timmermans & Marshall, 2020). The warm subsurface waters originating from the Atlantic and Pacific Oceans form a considerable heat reservoir in the Arctic Ocean, sufficient to melt all Arctic sea ice several times over (e.g., Turner, 2010).
Observational evidence for on-shelf heat transport driven by dense water export in the Weddell Sea - Nature Communications
Conductivity-Temperature-Depth (CTD) profiles Historical CTD-profiles from the slope region north of the Filchner Trough (roughly 72–74°S, 25–45°W) were obtained from Pangaea, BODC, Coriolis, Seanoe, World Ocean Database, and WOCE; see list below for references to the data sets included. CTD profiles collected by instrumented Weddell seals during 201121 over the continental shelf east and west of FT were downloaded from www.meop.net.
Intensification of Near‐Surface Currents and Shear in the Eastern Arctic Ocean
Abstract A 15‐year (2004–2018) record of mooring observations from the upper 50 m of the ocean in the eastern Eurasian Basin reveals increased current speeds and vertical shear, associated with an increasing coupling between wind, ice, and the upper ocean over 2004–2018, particularly in summer.
Atmosphere-Ice-Ocean-Ecosystem Processes in A Thinner Arctic Sea Ice Regime: the Norwegian Young Sea ICE (N-ICE2015) Expedition
Arctic sea ice has been in rapid decline the last decade and the Norwegian young sea ICE (N-ICE2015) expedition sought to investigate key processes in a thin Arctic sea ice regime, with emphasis on atmosphere-snow-ice-ocean dynamics and sea ice associated ecosystem.
Thermohaline staircases in the Amundsen Basin: Possible disruption by shear and mixing
As part of the 2013 and 2014 North Pole Environmental Observatories (NPEO) in the Amundsen Basin of the Arctic Ocean, two similar temperature microstructure experiments were performed with different results. In 2013, vertical fluxes were through a thermohaline staircase, and in 2014 the thermohaline staircase was largely absent. Here we investigate the reasons for this difference.
Mixing rates and vertical heat fluxes north of Svalbard from Arctic winter to spring
Mixing and heat flux rates collected in the Eurasian Basin north of Svalbard during the N-ICE2015 drift expedition are presented. The observations cover the deep Nansen Basin, the Svalbard continental slope and the shallow Yermak Plateau from winter to summer. Mean quiescent winter heat flux values in the Nansen Basin are 2Wm?2 at the ice-ocean interface, 3Wm?2in the pycnocline and 1Wm?2 below the pycnocline.
One-dimensional evolution of the upper water column in the Atlantic sector of the Arctic Ocean in winter
A one-dimensional model is employed to reproduce the observed time evolution of hydrographic properties in the upper water column during winter, between 26 January and 11 March 2015, in a region north of Svalbard in the Nansen Basin of the Arctic Ocean. From an observed initial state, vertical diffusion equations for temperature and salinity give the hydrographic conditions at a later stage.
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