Acoustic Detection of Oceanic Double-Diffusive Convection: A Feasibility Study

Ross, Tetjana; Lavery, Andone C.

doi:10.1175/2009jtecho696.1

Cited by 7 publications

(4 citation statements)

References 34 publications

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“…In addition, Ross and Lavery [2010] reported a dissipation rate of 10 -9 W kg -1 farther north on the Peninsula (between Renaud and Anvers Islands), which is a similar order of magnitude to our results.…”

Section: Time Series Of Inferred Diffusivity and Heat Fluxessupporting

confidence: 91%

Controls on turbulent mixing on the West Antarctic Peninsula shelf

Brearley

Meredith

Garabato

et al. 2017

Deep Sea Research Part II: Topical Studies in Oceanography

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The ocean-to-atmosphere heat budget of the West Antarctic Peninsula is controlled in part by the upward flux of heat from the warm Circumpolar Deep Water (CDW) layer that resides below ~200 m to the Antarctic Surface Water (AASW), a water mass which varies strongly on a seasonal basis. Upwelling and mixing of CDW influence the formation of sea ice in the region and affect biological productivity and functioning of the ecosystem through their delivery of nutrients. In this study, 2.5-year time series of both Acoustic Doppler Current Profiler (ADCP) and conductivitytemperature-depth (CTD) data are used to quantify both the diapycnal diffusivity κ and the vertical heat flux Q at the interface between CDW and AASW. Over the period of the study, a mean upward heat flux of ~1 W m-2 is estimated, with the largest heat fluxes occurring shortly after the loss of winter fast ice when the water column is first exposed to wind stress without being strongly stratified by salinity. Differences in mixing mechanisms between winter and summer seasons are investigated. Whilst tidally-driven mixing at the study site occurs year-round, but is likely to be relatively weak, a strong increase in counterclockwise-polarized near-inertial energy (and shear) is observed during the fast-ice-free season, suggesting that the direct impact of storms on the ocean surface is responsible for much of the observed mixing at the site. Given the rapid reduction in seaice duration in this region in the last 30 years, a shift towards an increasingly wind-dominated mixing regime may be taking place.

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Section: Time Series Of Inferred Diffusivity and Heat Fluxessupporting

confidence: 91%

Controls on turbulent mixing on the West Antarctic Peninsula shelf

Brearley

Meredith

Garabato

et al. 2017

Deep Sea Research Part II: Topical Studies in Oceanography

View full text Add to dashboard Cite

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“…This occurs principally where different water masses meet and interleave and thus mix. The results are roughly in agreement with Ross and Lavery (2010) who report an average of ε = 1 × 10 -9 Wkg -1 close to Anvers Island. la tasa de disipación; por encima de este límite, el ruido del instrumento prevalece sobre las mediciones.…”

Section: Mezclar Medidassupporting

confidence: 92%

Volume 50, Número Especial

2021

Bol. Investig. Mar. Costeras

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“…This occurs principally where different water masses meet and interleave and thus mix. The results are roughly in agreement with Ross and Lavery (2010) who report an average of ε = 1 × 10 -9 wkg -1 close to Anvers Island. la tasa de disipación; por encima de este límite, el ruido del instrumento prevalece sobre las mediciones.…”

Section: Mezclar Medidassupporting

confidence: 92%

Submeso-scale Mixing Features in the Gerlache Strait Bays (Antarctica)

Mojica

Holland

Monroy³

2021

Bol. Investig. Mar. Costeras

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Measurements of turbulence in the ocean are sparse, especially in environments such as Antarctica. Here we map the spatial distribution of diapycnal diffusivities and the water column characteristics across the three main bays in the Gerlache Strait on the western side of the Antarctic Peninsula. The measurements were recorded during the Fifth Colombian Antarctic Expedition, 2018-2019, using a Vertical Microstructure Profiler in free fall for the first 400 m depth, to record fluctuations of vertical shear at dissipation scales (10-3 – 103m). Diapycnal diffusivities are higher by 1-2 orders of magnitude in the Gerlache mainstream compared with the interior bays, with values from O (log10kρ = -3 m2 s -1) to O (log10kρ = -5 m2s -1) respectively over the upper 400 m. The highest mixing values were recorded in the southern section of Gerlache Strait (Flandes Bay) compared to the northern one (Charlotte Bay), indicating better wellmixed water in the south. Observed Hot Spots of higher turbulence levels may be associated with the interaction of the entrance of the Upper Circumpolar Depth Water, the Antarctic Surface Water, and the Weddell Sea Deep Waters with resident waters and topography.

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Acoustic Detection of Oceanic Double-Diffusive Convection: A Feasibility Study

Cited by 7 publications

References 34 publications

Controls on turbulent mixing on the West Antarctic Peninsula shelf

Controls on turbulent mixing on the West Antarctic Peninsula shelf

Volume 50, Número Especial

Submeso-scale Mixing Features in the Gerlache Strait Bays (Antarctica)

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