Turbulent heat transfer as a control of platelet ice growth in supercool under-ice ocean boundary-layers

McPhee, Miles G.; Stevens, Craig L.; Smith, Inga J.; Robinson, Natalie

doi:10.5194/osd-12-2807-2015

Cited by 2 publications

(1 citation statement)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Correspondingly, Thompson et al [2004] measured C d in the range 0.003-0.01 for flow >0.1 m s À1 over a homogenous gravel bed. These estimates are similar to those for the thin and transient platelets observed by McPhee et al [2016].…”

Section: Friedrichs and Wrightsupporting

confidence: 86%

Observations of amplified roughness from crystal accretion in the sub‐ice ocean boundary layer

Robinson

Stevens

McPhee

2017

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

Ice crystal accretion on the underside of sea ice and ice shelves, a signature of pressure‐induced supercooling, has the potential to alter the energy balance in the ocean boundary layer through enhanced hydrodynamic roughness. Here we present estimates of crystal‐driven ocean boundary layer roughness in supercooled water beneath sea ice adjacent to the McMurdo/Ross Ice Shelf. Data were collected from four sites in McMurdo Sound, Antarctica, between 2007 and 2015, and represent a range of ice shelf‐affected conditions. The results show that drag of the rough ice underside in the presence of platelets is 6–30 times larger than typical levels homogeneously applied in ice‐ocean interaction models. The crystal‐enhanced drag promotes increased entrainment into the boundary layer from the upper ocean, which has the potential to affect ice shelf evolution and sea ice growth through enhanced turbulent exchange of heat and momentum.

show abstract

Section: Friedrichs and Wrightsupporting

confidence: 86%

Observations of amplified roughness from crystal accretion in the sub‐ice ocean boundary layer

Robinson

Stevens

McPhee

2017

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

show abstract

Ocean turbulent boundary-layer influence on ice crystal behaviour beneath fast ice in an Antarctic ice shelf water plume: The “dirty ice”

Stevens

Robinson²,

O'Connor³

et al. 2023

Front. Mar. Sci.

View full text Add to dashboard Cite

The oceanic connection between ice shelf cavities and sea ice influences sea ice development and persistence. One unique feature in regions near ice shelves is the potential for sea ice growth due to crystal accretion on its underside. Here we present observations of ocean boundary-layer processes and ice crystal behaviour in an Ice Shelf Water outflow region from the Ross/McMurdo Ice Shelves. From a fast ice field camp during the Spring of 2015, we captured the kinematics of free-floating relatively large (in some cases 10s of mm in scale) ice crystals that were advecting and then settling upwards in a depositional layer on the sea ice underside (SIPL, sub-ice platelet layer). Simultaneously, we measured the background oceanic temperature, salinity, currents and turbulence structure. At the camp location the total water depth was 536 m, with the uppermost 50 m of the water column being in-situ super-cooled. Tidal flow speeds had an amplitude of around 0.1 m s-1 with dissipation rates in the under-ice boundary layer measured to be up to ε=10-6 W kg-1. Acoustic sampling (200 kHz) identified backscatter from large, individually identifiable suspended crystals associated with crystal sizes larger than normally described as frazil. Measurement of crystals in the SIPL found dimensions of the range 5-200 mm with an average of 93-101 mm depending on the year. The existence and settlement of crystals has implications for understanding SIPL evolution, the structure of sea ice, as well as the fate of Ice Shelf Water.

show abstract

Turbulent heat transfer as a control of platelet ice growth in supercool under-ice ocean boundary-layers

Cited by 2 publications

References 46 publications

Observations of amplified roughness from crystal accretion in the sub‐ice ocean boundary layer

Observations of amplified roughness from crystal accretion in the sub‐ice ocean boundary layer

Ocean turbulent boundary-layer influence on ice crystal behaviour beneath fast ice in an Antarctic ice shelf water plume: The “dirty ice”

Contact Info

Product

Resources

About