scholarly journals Landfast ice controls on turbulence in Antarctic coastal seas

2021 ◽  
Author(s):  
Mark E. Inall ◽  
J. Alexander Brearley ◽  
Sian F. Henley ◽  
Alexander D. Fraser ◽  
Sarah Reed
Keyword(s):  
Landfast Ice

Ice ridges in landfast ice of Shokal'skogo Strait

2019 ◽  
Vol 12 (3) ◽  
pp. 16-26
Author(s):  
Victor V. Kharitonov
Keyword(s):  
Penetration Rate ◽  
Hot Water ◽  
First Year ◽  
Height Ratio ◽  
Long Distance ◽  
Cross Sectional ◽  
Landfast Ice ◽  
Thermal Drilling ◽  
Severnaya Zemlya ◽  
Severnaya Zemlya Archipelago

Three first-year ice ridges have been examined with respect to geometry and morphology in landfast ice of Shokal'skogo Strait (Severnaya Zemlya Archipelago) in May 2018. Two of the studied ice ridges were located on the edge of the ridged field and were part of it, because their keels extended for a long distance deep into this field. Ice ridges characteristics are discussed in the paper. These studies were conducted using hot water thermal drilling with computer recording of the penetration rate. Boreholes were drilled along the cross-section of the ridge crest at 0.25 m intervals. Cross-sectional profiles of ice ridges are illustrated. The maximal sail height varied from 2.9 up to 3.2 m, the maximal keel depth varied from 8.5 up to 9.6 m. The average keel depth to sail height ratio varied from 2.8 to 3.3, and the thickness of the consolidated layer was 2.5-3.5 m. The porosity of the non-consolidated part of the keel was about 23-27%. The distributions of porosity versus depth for all ice ridges are presented.

Growth of landfast ice and its thermal interaction with bottom sediments in the Braganzav{\r a}gen Gulf (West Spitsbergen)

2020 ◽  
Vol 20 (6) ◽  
pp. 1-11
Author(s):  
P. V. Bogorodskiy ◽  
N. E. Demidov ◽  
K. V. Filchuk ◽  
A. V. Marchenko ◽  
E. G. Morozov ◽  
...  
Keyword(s):  
Bottom Sediments ◽  
Thermal Interaction ◽  
Landfast Ice ◽  
West Spitsbergen

scholarly journals Characteristics of Sea-ice thickness and Snow-depth distributions of the Summer landfast ice in Lützow-Holm Bay, East Antarctica

2006 ◽  
Vol 44 ◽  
pp. 281-287 ◽  
Author(s):  
Shotaro Uto ◽  
Haruhito Shimoda ◽  
Shuki Ushio
Keyword(s):  
Sea Ice ◽  
Interannual Variability ◽  
Snow Depth ◽  
East Antarctica ◽  
Ice Thickness ◽  
First Year ◽  
Total Thickness ◽  
Sea Ice Thickness ◽  
Landfast Ice ◽  
Northeasterly Wind

AbstractSea-ice observations have been conducted on board icebreaker shirase as a part of the Scientific programs of the Japanese Antarctic Research Expedition. We Summarize these to investigate Spatial and interannual variability of ice thickness and Snow depth of the Summer landfast ice in Lützow-Holm Bay, East Antarctica. Electromagnetic–inductive observations, which have been conducted Since 2000, provide total thickness distributions with high Spatial resolution. A clear discontinuity, which Separates thin first-year ice from thick multi-year ice, was observed in the total thickness distributions in two voyages. Comparison with Satellite images revealed that Such phenomena reflected the past breakup of the landfast ice. Within 20–30km from the Shore, total thickness as well as Snow depth decrease toward the Shore. This is due to the Snowdrift by the Strong northeasterly wind. Video observations of Sea-ice thickness and Snow depth were conducted on 11 voyages Since December 1987. Probability density functions derived from total thickness distributions in each year are categorized into three types: a thin-ice, thick-ice and intermediate type. Such interannual variability primarily depends on the extent and duration of the Successive break-up events.

Holocene sea-ice dynamics in Petermann Fjord 

2021 ◽  
Author(s):  
Henrieka Detlef ◽  
Brendan Reilly ◽  
Anne Jennings ◽  
Mads Mørk jensen ◽  
Matt O'Regan ◽  
...  
Keyword(s):  
Sea Ice ◽  
Carbon Isotopic Composition ◽  
Greenland Ice Sheet ◽  
Ekman Transport ◽  
Tight Coupling ◽  
Ice Dynamics ◽  
The Holocene ◽  
Nares Strait ◽  
Sea Ice Dynamics ◽  
Landfast Ice

<p>Today Nares Strait is covered by sea ice for 11 months per year. The seasonal sea-ice regime and formation of landfast ice depend on the development of ice arches. Historically a northern and southern ice arch have been observed in Robeson Channel and Smith Sound, respectively, with only the southern arch leading to a complete freeze up of the strait. In recent decades, the northern arch has become more prominent, indicating a regime shift in Nares Strait sea-ice dynamics with important consequences for the export of ice from the Lincoln Sea, the regional oceanography, and the ecosystem related to the annual opening of the North Water Polynya lee of the southern ice arch. Modelling studies suggest a link between mobile sea ice and enhanced Ekman transport of modified Atlantic Water to Greenland fjord systems bordering Nares Strait. Further, a reduction in the fjords’ fast ice season, in response to Nares Strait sea-ice dynamics, might decrease its buttressing effect on the marine-terminating outlet glaciers in northern Greenland. One such glacier is Petermann Glacier, draining 4% of the Greenland Ice Sheet and terminating in a 48 km long ice tongue in Petermann Fjord.</p><p>The Petermann 2015 Expedition to Petermann Fjord and adjacent Hall Basin recovered a transect of cores from Nares Strait to under the 48 km long ice tongue of Petermann glacier. First results suggest that no ice tongue existed in Petermann Fjord for large parts of the Holocene, raising the question of the role of the ocean and the marine cryosphere in the collapse and re-establishment of the ice tongue. We present a multi-proxy study (sea-ice related biomarkers, total organic carbon and its carbon isotopic composition, and benthic and planktonic foraminiferal abundances) exploring the Holocene sea-ice dynamics at site OD1507-03TC-41GC-03PC in outer Petermann Fjord. Our results are in line with a tight coupling of the marine and terrestrial cryosphere in this region and, in connection with other regional sea-ice reconstructions, give insights into the Holocene evolution of ice arches and associated landfast ice in Nares Strait.</p>

scholarly journals The Impact of Tides on Simulated Landfast Ice in a Pan‐Arctic Ice‐Ocean Model

2018 ◽  
Author(s):  
Jean‐François Lemieux ◽  
Ji Lei ◽  
Frédéric Dupont ◽  
François Roy ◽  
Martin Losch ◽  
...  
Keyword(s):  
Ocean Model ◽  
Landfast Ice ◽  
Arctic Ice ◽  
The Impact

scholarly journals Estimating Meltwater Drainage Onset Timing and Duration of Landfast Ice in the Canadian Arctic Archipelago Using AMSR-E Passive Microwave Data

2020 ◽  
Vol 12 (6) ◽  
pp. 1033
Author(s):  
Yasuhiro Tanaka
Keyword(s):  
Time Series ◽  
Large Scale ◽  
Polynomial Regression ◽  
The Arctic ◽  
Imaging Spectrometer ◽  
Earth Observing System ◽  
Medium Resolution ◽  
Onset Timing ◽  
Landfast Ice ◽  
Heat Budgets

Meltwater drainage onset (DO) timing and drainage duration (DD) related to snowmelt-water redistribution are both important for understanding not only the Arctic energy and heat budgets but also the salt/heat balance of the mixed layer in the ocean and sea-ice ecosystem. We present DO and DD as determined from the time series of Advanced Microwave Scanning Radiometer-Earth observing system (AMSR-E) melt pond fraction (MPF) estimates in an area with Canadian landfast ice. To address the lack of evaluation on a day-by-day basis for the AMSR-E MPF estimate, we first compared AMSR-E MPF with the daily Medium Resolution Imaging Spectrometer (MERIS) MPF. The AMSR-E MPF estimate correlates significantly with the MERIS MPF (r = 0.73–0.83). The estimate has a product quality similar to the MERIS MPF only when the albedo is around 0.5–0.7 and a positive bias of up to 10% in areas with an albedo of 0.7–0.9, including melting snow. The DO/DD estimates are determined by using a polynomial regression curve fitted on the time series of the AMSR-E MPF. The DOs/DDs from time series of the AMSR-E and MERIS MPFs are compared, revealing consistency in both DD and DO. The DO timing from 2006 to 2011 is correlated with melt onset timing. To the best of our knowledge, our study provides the first large-scale information on both DO timing and DD.

scholarly journals Measurements of light transfer through drift ice and landfast ice in the northern Baltic Sea

Oceanologia ◽  
2020 ◽  
Vol 62 (3) ◽  
pp. 347-363
Author(s):  
Elina Kari ◽  
Arttu Jutila ◽  
Anna Friedrichs ◽  
Matti Leppäranta ◽  
Susanne Kratzer
Keyword(s):  
Baltic Sea ◽  
Landfast Ice ◽  
Light Transfer

Measurements of Waves in Landfast Ice Using Inertial Motion Units

2016 ◽  
Vol 54 (11) ◽  
pp. 6399-6408 ◽  
Author(s):  
Jean Rabault ◽  
Graig Sutherland ◽  
Brian Ward ◽  
Kai H. Christensen ◽  
Trygve Halsne ◽  
...  
Keyword(s):  
Inertial Motion ◽  
Landfast Ice

OIL SPILL COUNTERMEASURES IN LANDFAST SEA ICE

1981 ◽  
Vol 1981 (1) ◽  
pp. 297-304 ◽  
Author(s):  
Alan A. Allen ◽  
William G. Nelson
Keyword(s):  
Sea Ice ◽  
Oil Spills ◽  
The United States ◽  
Diesel Oil ◽  
Natural Conditions ◽  
Ice Surface ◽  
Landfast Ice ◽  
Actual Field ◽  
Landfast Sea Ice ◽  
Physical And Chemical

ABSTRACT The behavior of crude oil and diesel oil in solid landfast sea ice has been examined under a variety of conditions by scientists in both the United States and the Canadian Arctic. Controlled oil releases under laboratory and actual field conditions have shown that oil spills in the landfast ice zone will tend to remain highly immobilized and achieve relatively thick concentrations. Such spills will encounter natural conditions that encourage accumulation of the oil at or near the ice surface, limit the areal extent of the oil, and help preserve certain physical and chemical characteristics that facilitate its control. A summary of these phenomena for oil in landfast sea ice reveals several important operational considerations for the development of specific Arctic countermeasure techniques. Such techniques for the containment and removal of oil in the landfast ice zone are presented, emphasizing the use of natural materials and conditions for their implementation.

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