The winter oceanography of McMurdo Sound, Antarctica

Lewis, E. L.; Perkin, R. G.

doi:10.1029/ar043p0145

Cited by 88 publications

(152 citation statements)

References 10 publications

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“…and Wadhams, 1989). In the austral winters of 1984, Barry (1988 and Crocker and Wadhams ( 1989) respectively reported that, prior to basal melting, the locations of the thickest platelet-ice accumulations corresponded to the areas of maximum surface supercooling reported by Lewis and Perkin (1985). The pattern of occurrence and quantity of platelet ice in our…”

Section: Upper Congelation Ice Layermentioning

confidence: 79%

“…Water depths vary from about 200 m on the western side of McMurdo Sound to 600 m on the eastern side in the vicinity of Cape Royds (Lewis and Perkin, 1985). Circulation in the upper 200 m of the water column is dominated by currents flowing northward into McMurdo Sound from below the McMurdo Ice Shelf, plus an anti-cyclonic eddy in the vicinity of Cape Royds (Heath, 1977;Lewis and Perkin, 1985). Paige (1966) characterized the climate of McMurdo Sound as one with frequent high winds, drifting snow, low temperatures and extreme temperature fluctuations.…”

Section: Field Settingmentioning

confidence: 99%

“…In McMurdo Sound it is believed that the platelets grow from adiabatically supercooled low-density water that flows northward into the Sound from below McMurdo Ice Shelf (Lewis and Perkin, 1985;Crocker <J Fig. 4 .…”

Section: Stratigraphy and Compositionmentioning

confidence: 99%

“…and solidification (Paige, 1966;Cow and others, 1982;Lewis and Perkin, 1985;Crocker and Wad hams, 1989) . Using the McMurdo Sound fast ice as an example, Crocker and Wadhams (1989) successfully applied a thermodynamic model to the sequence of Antarctic fastice development by congelation ice growth and plateletice solidification.…”

mentioning

confidence: 99%

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Structural characteristics of congelation and platelet ice and their role in the development of antarctic land-fast sea ice

et al. 1993

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ABSTRACT. Ice cores were obtained in January 1990 from the land-fast ice inMcMurdo Sound for a study of variations in texture, fabric, sub-structure, composition and development. Two primary ice types were observed, congelation and platelet, with a minor amount of frazil ice. Congelation ice growth precedes platelet-ice accretion. Congelation-ice fabrics show frequent moderate to strong alignments, a phenomenon believed to be due to water-current control of selective ice-crystal growth. Platelet ice originates at the base of the congelation ice, initially as a porous latticework of tabular ice crystals which subsequently consolidate by congelation of the interstitial water. Interstitial congelation-ice fabrics generally have little or no alignment, indicating the reduced effect of currents within the platelet latticework prior to solidification. Platelet-crystal textures range from small, wavyedged forms to large, blade-like forms . Platelet-crystal fabrics indicate that, in addition to being randomly oriented, the platelet latticeworks commonly include many crystals with their flat (0001) faces oriented both parallel and normal to the base of the overlying ice. Plate-width data suggest that the interstitial con gelation icegrowth rates remain similar to those of the overlying congelation ice. This effective increase in growth rates probably happens because the latticework of accumulating platelets ahead of the freezing interface ensures that the water within the platelet layer is at the freezing point and less heat has to be removed from platelet-rich water than from platelet-free water for a given thickness of congelation ice to grow. The negative oceanic heat flux associated with platelet-ice formation in McMurdo Sound explains why McMurdo Sound fast ice is thicker than Ross Sea pack ice, and also why it reaches a greater thickness than Arctic fast ice grown in a similar polar marine climate. Plate widths in the McMurdo Sound congelation ice suggest, however, that it grows no faster than Arctic conge1ation ice.

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Section: Upper Congelation Ice Layermentioning

confidence: 79%

Section: Field Settingmentioning

confidence: 99%

Section: Stratigraphy and Compositionmentioning

confidence: 99%

mentioning

confidence: 99%

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Structural characteristics of congelation and platelet ice and their role in the development of antarctic land-fast sea ice

et al. 1993

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“…For the smaller <65 m, there is a relatively consistent increase in ASTR with increasing , while for the larger ≥65 m, ASTR tends to be much more variable. It is worth mentioning that =65 m is exactly the value estimated by HU14 25 based on the measurements conducted by Lewis and Perkin (1985) and Jones and Hill (2001). For =78 m and greater, an inflexion point (stars in Fig.…”

Section: Dependence Of Sipl Thickening Rate On Isw Supercoolingmentioning

confidence: 54%

Response of sub-ice platelet layer thickening rate to variations in Ice Shelf Water supercooling in McMurdo Sound, Antarctica

Chen

Jenkins

Holland

et al. 2018

Preprint

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Intrusion of warm surface water beneath the McMurdo Ice Shelf, Antarctica

et al. 2013

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[1] A 6 month temperature record collected below McMurdo Ice Shelf in 2011-2012 shows the temporal and spatial structure of the summertime warm water signal that penetrates beneath the ice shelf. The strength and duration of the warm water intrusion suggest an annual melt rate at Windless Bight of 0.71 m/yr. A Ross Sea numerical model demonstrates a seasonal warm water pathway leading from the west side of the Ross Sea Polynya (RSP) toward McMurdo Sound. The warm water enters McMurdo Sound, subducts beneath the ice shelf and causes accelerated summer melting. Temperature data were recorded using Distributed Temperature Sensing fiber optics, which gives a vertical temperature profile at a 1 m vertical resolution. This study constitutes one of the first successful implementations of this technology in Polar Regions.

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The winter oceanography of McMurdo Sound, Antarctica

Cited by 88 publications

References 10 publications

Structural characteristics of congelation and platelet ice and their role in the development of antarctic land-fast sea ice

Structural characteristics of congelation and platelet ice and their role in the development of antarctic land-fast sea ice

Response of sub-ice platelet layer thickening rate to variations in Ice Shelf Water supercooling in McMurdo Sound, Antarctica

Intrusion of warm surface water beneath the McMurdo Ice Shelf, Antarctica

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