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6 results for “Antarctic Circumpolar Current”
Future decline of Antarctic Circumpolar Current model data and figures
<p>This upload contains all the post-processed files and code necessary to recreate the figures in the manuscript entitled "<em>Future decline of Antarctic Circumpolar Current due to polar ocean freshening</em>" by Sohail, Gayen and Klocker. </p>
Data from: Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean Meridional Overturning Circulation
The meridional overturning circulation (MOC) in the Southern Ocean is investigated using hydrographic observations combined with satellite measurements of sea surface height. A three-dimensional (spatial and vertical) estimate of the isopycnal eddy diffusivity in the Southern Ocean is obtained using the theory of Ferrari and Nikurashin that includes the influence of suppression of the diffusivity by the strong, time-mean flows. It is found that the eddy diffusivity is enhanced at depth, reaching a maximum at the critical layer near 1000 m. The estimate of diffusivity is used with a simple diffusive parameterization to estimate the meridional eddy volume flux. This estimate of eddy volume flux is combined with an estimate of the Ekman transport to reconstruct the time-mean overturning circulation. By comparing the reconstruction with, and without, suppression of the eddy diffusivity by the mean flow, the influence of the suppression on the overturning is illuminated. It is shown that the suppression of the eddy diffusivity results in a large reduction of interior eddy transports and a more realistic eddy-induced overturning circulation. Finally, a simple conceptual model is used to show that the MOC is influenced not only by the existence of enhanced diffusivity at depth but also by the details of the vertical structure of the eddy diffusivity, such as the depth of the critical layer.
Data from: Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean Meridional Overturning Circulation
Open the record for dataset details and reuse information.
Deep convection induce strong proto-Antarctic Circumpolar Current
<p>This dataset includes model outputs of a high-resolution model with realistic late Eocene topography, which is applied to test the sensitivity of the proto-ACC to late Eocene and modern surface buoyancy forcing. The included data can be used to analyse temperature, salinity, zonal velocity distribution, eddy kinetic energy, and mixed layer depth in late Eocene Southern Ocean.</p>
Data for the figures of Sasaki et al. entitled "Turbulence across the Antarctic Circumpolar Current in the Indian Southern Ocean: Micro-Temperature Measurements and Finescale Parameterizations"
<p>1) Microstructure.nc includes profiles of epsilon and diapycnal diffusivity obtained from FP07 measurements.</p> <p>2) Fine_parameters.nc includes profiles of buoyancy frequency (N), shear-strain ratio, normalized internal wave energy, and polarization ratio of the counterclockwise (CCW) versus the clockwise (CW) component of the shear.</p> <p>3) epsilon_FineParam.nc includes profiles of epsilon calculated by finescale parameterizations. The subscript of each variable (eps_Fine_X) in this file corresponds to the row letter (a-l) of Table. 1.</p> <p>4) Fine_spectral_shape.nc includes profiles of Hstrain and spectral slope (s). </p>
Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations?
<p>Datasets for the Journal of Geophysical Research: Oceans publication: "Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations?"</p> <p>[Abstract] Uncertainty exists in the time-mean total transport of the Antarctic Circumpolar Current (ACC), the world’s strongest ocean current. The two most recent observational programs in Drake Passage, DRAKE and cDrake, yielded transports of 141 and 173.3 Sv, respectively. In this paper, we use a realistic 1/12° global ocean simulation to interpret these observational estimates and reconcile their differences. We first show that the modeled ACC transport in the upper 1000 m is in excellent agreement with repeat shipboard acoustic Doppler current profiler (SADCP) transects and that the exponentially decaying transport profile in the model is consistent with the profile derived from repeat hydrographic data. By further comparing the model results to the cDrake and DRAKE observations, we argue that the modeled 157.3 Sv transport, i.e. approximately the average of the cDrake and DRAKE estimates, is actually representative of the time-mean ACC transport through the Drake Passage. The cDrake experiment overestimates the barotropic contribution in part because the array undersampled the deep recirculation southwest of the Shackleton Fracture Zone, whereas the surface geostrophic currents used in the DRAKE estimate yielded a weaker near-surface transport than implied by the SADCP data. We also find that the modeled baroclinic and barotropic transports are not correlated, thus monitoring either baroclinic or barotropic transport alone may be insufficient to assess the temporal variability of the total ACC transport.</p>
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