An analysis of gravity measurements on the Ross Ice Shelf, Antarctica

1992 ◽  
pp. 105-155 ◽  
Author(s):  
Lawrence L. Greischar ◽  
Charles R. Bentley ◽  
Larry R. Whiting
Keyword(s):  
Ice Shelf ◽  
Ross Ice Shelf ◽  
Gravity Measurements

The Contact of the Ross Ice Shelf with the Continental Ice Sheet, Antarctica

1961 ◽  
Vol 3 (29) ◽  
pp. 823-832
Author(s):  
Edward Thiel ◽  
Ned A. Ostenso
Keyword(s):  
Gravity Anomaly ◽  
Ice Sheet ◽  
Hydrostatic Equilibrium ◽  
Ice Thickness ◽  
Deep Borehole ◽  
Ice Shelf ◽  
Ross Ice Shelf ◽  
Seismic Sounding ◽  
Gravity Measurements ◽  
Depth Relationship

AbstractA profile of ice thickness along the 647 mile trail from Little America V to Byrd Station has been obtained from altimetric, seismic, and gravity measurements, and detailed studies made at the junction of the Ross Ice Shelf and the Marie Byrd Land plateau. The surface elevation profile clearly shows the depression characteristic of this contact. The thickness of the floating ice shelf has been determined from the elevations assuming hydrostatic equilibrium; for this purpose the accurately known density-depth relationship obtained from a deep borehole at Little America V was employed. The buried rock topography at the contact has been deduced from a seismic sounding and variations in the gravity anomaly. Movement studies over a 22 month period are presented, and the crevasse pattern of the contact is analyzed in terms of ice movement. Suggestions are given for traversing the region by vehicle.

Ross Ice Shelf Project, 1977–78

Polar Record ◽  
1979 ◽  
Vol 19 (121) ◽  
pp. 379-379
Author(s):  
John W. Clough
Keyword(s):  
Surface Strain ◽  
Mean Annual Temperature ◽  
Strain Rates ◽  
Ice Shelf ◽  
Complete Coverage ◽  
Ross Ice Shelf ◽  
Velocity Surface ◽  
Gravity Measurements ◽  
Field Season ◽  
Bottom Depth

The 1977–78 Ross Ice Shelf Project (RISP) field season was marked by two major achievements: completion of the Ross Ice Geophysical and Glaciological Survey (RIGGS) and successful penetration of the ice shelf at the RISP drill camp (82°22′S 168°38′N). The RIGGS programme visited nearly 200 sites over four field seasons, providing complete coverage of the shelf with measurements of ice thickness and velocity, surface strain rates, bottom depth, accumulation, and mean annual temperature. The survey work was conducted by Twin Otter aircraft operating from six temporary base camps. Tidal gravity measurements were made at these six camps and a few additional sites.

scholarly journals The Contact of the Ross Ice Shelf with the Continental Ice Sheet, Antarctica

1961 ◽  
Vol 3 (29) ◽  
pp. 823-832 ◽  
Author(s):  
Edward Thiel ◽  
Ned A. Ostenso
Keyword(s):  
Gravity Anomaly ◽  
Ice Sheet ◽  
Hydrostatic Equilibrium ◽  
Ice Thickness ◽  
Deep Borehole ◽  
Ice Shelf ◽  
Ross Ice Shelf ◽  
Seismic Sounding ◽  
Gravity Measurements ◽  
Depth Relationship

Abstract A profile of ice thickness along the 647 mile trail from Little America V to Byrd Station has been obtained from altimetric, seismic, and gravity measurements, and detailed studies made at the junction of the Ross Ice Shelf and the Marie Byrd Land plateau. The surface elevation profile clearly shows the depression characteristic of this contact. The thickness of the floating ice shelf has been determined from the elevations assuming hydrostatic equilibrium; for this purpose the accurately known density-depth relationship obtained from a deep borehole at Little America V was employed. The buried rock topography at the contact has been deduced from a seismic sounding and variations in the gravity anomaly. Movement studies over a 22 month period are presented, and the crevasse pattern of the contact is analyzed in terms of ice movement. Suggestions are given for traversing the region by vehicle.

scholarly journals Environmental and Oceanographic Conditions at the Continental Margin of the Central Basin, Northwestern Ross Sea (Antarctica) Since the Last Glacial Maximum

Geosciences ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 155
Author(s):  
Fiorenza Torricella ◽  
Romana Melis ◽  
Elisa Malinverno ◽  
Giorgio Fontolan ◽  
Mauro Bussi ◽  
...  
Keyword(s):  
Continental Margin ◽  
Ross Sea ◽  
Time Interval ◽  
Central Basin ◽  
Ice Shelf ◽  
Last Glacial ◽  
Ross Ice Shelf ◽  
Sedimentary Sequences ◽  
Ash Layer ◽  
The Last Glacial

The continental margin is a key area for studying the sedimentary processes related to the advance and retreat of the Ross Ice Shelf (Antarctica); nevertheless, much remains to be investigated. The aim of this study is to increase the knowledge of the last glacial/deglacial dynamics in the Central Basin slope–basin system using a multidisciplinary approach, including integrated sedimentological, micropaleontological and tephrochronological information. The analyses carried out on three box cores highlighted sedimentary sequences characterised by tree stratigraphic units. Collected sediments represent a time interval from 24 ka Before Present (BP) to the present time. Grain size clustering and data on the sortable silt component, together with diatom, silicoflagellate and foraminifera assemblages indicate the influence of the ice shelf calving zone (Unit 1, 24–17 ka BP), progressive receding due to Circumpolar Deep Water inflow (Unit 2, 17–10.2 ka BP) and (Unit 3, 10.2 ka BP–present) the establishment of seasonal sea ice with a strengthening of bottom currents. The dominant and persistent process is a sedimentation controlled by contour currents, which tend to modulate intensity in time and space. A primary volcanic ash layer dated back at around 22 ka BP is correlated with the explosive activity of Mount Rittmann.

New determinations of tides on the north-western Ross Ice Shelf

2020 ◽  
pp. 1-14
Author(s):  
Richard D. Ray ◽  
Kristine M. Larson ◽  
Bruce J. Haines
Keyword(s):  
Time Series ◽  
Tide Gauge ◽  
High Rate ◽  
Ice Shelf ◽  
Ross Ice Shelf ◽  
The North ◽  
Global Positioning ◽  
North Western

Abstract New determinations of ocean tides are extracted from high-rate Global Positioning System (GPS) solutions at nine stations sitting on the Ross Ice Shelf. Five are multi-year time series. Three older time series are only 2–3 weeks long. These are not ideal, but they are still useful because they provide the only in situ tide observations in that sector of the ice shelf. The long tide-gauge observations from Scott Base and Cape Roberts are also reanalysed. They allow determination of some previously neglected tidal phenomena in this region, such as third-degree tides, and they provide context for analysis of the shorter datasets. The semidiurnal tides are small at all sites, yet M2 undergoes a clear seasonal cycle, which was first noted by Sir George Darwin while studying measurements from the Discovery expedition. Darwin saw a much larger modulation than we observe, and we consider possible explanations - instrumental or climatic - for this difference.

scholarly journals Ross Ice Shelf airstream driven by polar vortex cyclone

Eos ◽  
2012 ◽  
Vol 93 (27) ◽  
pp. 256-256
Author(s):  
Colin Schultz
Keyword(s):  
Polar Vortex ◽  
Ice Shelf ◽  
Ross Ice Shelf

Ross Ice Shelf temperatures support a history of ice-shelf thickening

Nature ◽  
1979 ◽  
Vol 282 (5740) ◽  
pp. 703-705 ◽  
Author(s):  
Douglas R. MacAyeal ◽  
Robert H. Thomas
Keyword(s):  
Ice Shelf ◽  
Ross Ice Shelf ◽  
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