Annual cycle of landfast sea ice in Prydz Bay, east Antarctica

The observed snow depth and ice thickness on landfast sea ice in Prydz Bay, East Antarctica, were used to determine the role of snow in (a) the annual cycle of sea ice thickness at a fixed location (SIP) where snow usually blows away after snowfall and (b) early summer sea ice thickness within the transportation route surveys (TRS) domain farther from coast, where annual snow accumulation is substantial. The annual mean snow depth and maximum ice thickness had a negative relationship (r = &#8722;0.58, p < 0.05) at SIP, indicating a primary insulation effect of snow on ice thickness. However, in the TRS domain, this effect was negligible because snow contributes to ice thickness. A one-dimensional thermodynamic sea ice model, forced by local weather observations, reproduced the annual cycle of ice thickness at SIP well. During the freeze season, the modeled maximum difference of ice thickness using different snowfall scenarios ranged from 0.53&#8211;0.61 m. Snow cover delayed ice surface and ice bottom melting by 45 and 24 days, respectively. The modeled snow ice and superimposed ice accounted for 4&#8211;23% and 5&#8211;8% of the total maximum ice thickness on an annual basis in the case of initial ice thickness ranging from 0.05&#8211;2 m, respectively.

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Observation and thermodynamic modeling of the influence of snow cover on landfast sea ice thickness in Prydz Bay, East Antarctica

Cold Regions Science and Technology ◽

10.1016/j.coldregions.2019.102869 ◽

2019 ◽

Vol 168 ◽

pp. 102869 ◽

Cited By ~ 1

Author(s):

Jiechen Zhao ◽

Bin Cheng ◽

Timo Vihma ◽

Qinghua Yang ◽

Fengming Hui ◽

...

Keyword(s):

Sea Ice ◽

Snow Cover ◽

Thermodynamic Modeling ◽

East Antarctica ◽

Prydz Bay ◽

Ice Thickness ◽

Sea Ice Thickness ◽

Landfast Sea Ice

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Annual cycle of fCO2 under sea-ice and in open water in Prydz Bay, East Antarctica

Marine Chemistry ◽

10.1016/s0304-4203(99)00040-7 ◽

1999 ◽

Vol 66 (3-4) ◽

pp. 187-200 ◽

Cited By ~ 85

Author(s):

John A.E Gibson ◽

Tom W Trull

Keyword(s):

Sea Ice ◽

Annual Cycle ◽

Open Water ◽

East Antarctica ◽

Prydz Bay

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Spectral albedo of coastal landfast sea ice in Prydz Bay, Antarctica

Journal of Glaciology ◽

10.1017/jog.2020.90 ◽

2020 ◽

pp. 1-11

Author(s):

Guanghua Hao ◽

Roberta Pirazzini ◽

Qinghua Yang ◽

Zhongxiang Tian ◽

Changwei Liu

Keyword(s):

Sea Ice ◽

Near Infrared ◽

Elevation Angle ◽

Early Summer ◽

Prydz Bay ◽

Katabatic Wind ◽

Surface Conditions ◽

Zhongshan Station ◽

Landfast Sea Ice ◽

Two Phases

Abstract The surface spectral albedo was measured over coastal landfast sea ice in Prydz Bay (off Zhongshan Station), East Antarctica from 5 October to 26 November of 2016. The mean albedo decreased from late-spring to early-summer, mainly responding to the change in surface conditions from dry (phase I) to wet (phase II). The evolution of the albedo was strongly influenced by the surface conditions, with alternation of frequent snowfall events and katabatic wind that induce snow blowing at the surface. The two phases and day-to-day albedo variability were more pronounced in the near-infrared albedo wavelengths than in the visible ones, as the near-infrared photons are more sensitive to snow metamorphism, and to changes in the uppermost millimeters and water content of the surface. The albedo diurnal cycle during clear sky conditions was asymmetric with respect to noon, decreasing from morning to evening over full and patchy snow cover, and decreasing more rapidly in the morning over bare ice. We conclude that snow and ice metamorphism and surface melting dominated over the solar elevation angle dependency in shaping the albedo evolution. However, we realize that more detailed surface observations are needed to clarify and quantify the role of the various surface processes.

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Annual cycle of carbonate chemistry and decadal change in coastal Prydz Bay, East Antarctica

Marine Chemistry ◽

10.1016/j.marchem.2013.06.006 ◽

2013 ◽

Vol 155 ◽

pp. 135-147 ◽

Cited By ~ 49

Author(s):

Nicholas P. Roden ◽

Elizabeth H. Shadwick ◽

Bronte Tilbrook ◽

Thomas W. Trull

Keyword(s):

Annual Cycle ◽

East Antarctica ◽

Prydz Bay ◽

Decadal Change ◽

Carbonate Chemistry

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The variability of surface radiation fluxes over landfast sea ice near Zhongshan station, east Antarctica during austral spring

International Journal of Digital Earth ◽

10.1080/17538947.2017.1304458 ◽

2017 ◽

Vol 12 (8) ◽

pp. 860-877 ◽

Cited By ~ 7

Author(s):

Lejiang Yu ◽

Qinghua Yang ◽

Mingyu Zhou ◽

Donald H. Lenschow ◽

Xianqiao Wang ◽

...

Keyword(s):

Sea Ice ◽

East Antarctica ◽

Surface Radiation ◽

Austral Spring ◽

Zhongshan Station ◽

Radiation Fluxes ◽

Landfast Sea Ice

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Albedo of coastal landfast sea ice in Prydz Bay, Antarctica: Observations and parameterization

Advances in Atmospheric Sciences ◽

10.1007/s00376-015-5114-7 ◽

2016 ◽

Vol 33 (5) ◽

pp. 535-543 ◽

Cited By ~ 10

Author(s):

Qinghua Yang ◽

Jiping Liu ◽

Matti Leppäranta ◽

Qizhen Sun ◽

Rongbin Li ◽

...

Keyword(s):

Sea Ice ◽

Prydz Bay ◽

Landfast Sea Ice

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Modelling landfast sea ice and its influence on ocean-ice interactions in the area of the Totten Glacier, East Antarctica

10.5194/egusphere-egu21-8846 ◽

2021 ◽

Author(s):

Guillian Van Achter ◽

Thierry Fichefet ◽

Hugues Goosse ◽

Charles Pelletier ◽

Jean Sterlin ◽

...

Keyword(s):

Sea Ice ◽

Climate Models ◽

Mixed Layer Depth ◽

Global Climate Models ◽

East Antarctica ◽

Ice Shelf ◽

Sea Ice Extent ◽

Coastal Polynya ◽

Landfast Sea Ice ◽

The Impact

The Totten Glacier in East Antarctica is of major climate interest because of the large fluctuation of its grounding line and of its potential vulnerability to climate change. The ocean above the continental shelf in front of the Totten ice shelf exhibits large extents of landfast sea ice with low interannual variability. Landfast sea ice is mostly not or sole crudely represented in current climate models. These models are potentially omitting or misrepresenting important effects related to this type of sea ice, such as its influence on coastal polynya locations. Yet, the impact of the landfast sea ice on the ocean &#8211; ice shelf interactions is poorly understood. Using a series of high-resolution, regional NEMO-LIM-based experiments including an explicit treatment of ocean &#8211; ice shelf interactions over the years 2001-2010, we simulate a realistic landfast sea ice extent in the area of Totten Glacier through a combination of a sea ice tensile strength parameterisation and a grounded iceberg representation. We show that the presence of landfast sea ice impacts seriously both the location of coastal polynyas and the ocean mixed layer depth along the coast, in addition to favouring the intrusion of mixed Circumpolar Deep Water into the ice shelf cavities. Depending on the local bathymetry and the landfast sea ice distribution, landfast sea ice affects ice shelf cavities in different ways, either by increasing the ice melt (+28% for the Moscow University ice shelf) or by reducing its seasonal cycle (+10% in March-May for the Totten ice shelf). This highlights the importance of including an accurate landfast sea ice representation in regional and eventually global climate models

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