CO2 jets formed by sublimation beneath translucent slab ice in Mars' seasonal south polar ice cap

Nature ◽  
2006 ◽  
Vol 442 (7104) ◽  
pp. 793-796 ◽  
Author(s):  
Hugh H. Kieffer ◽  
Philip R. Christensen ◽  
Timothy N. Titus
Keyword(s):  
Polar Ice ◽  
Ice Cap ◽  
South Polar

scholarly journals Timescales of the Climate Record in the South Polar Ice Cap of Mars

2019 ◽  
Vol 46 (13) ◽  
pp. 7268-7277 ◽  
Author(s):  
Patricio Becerra ◽  
Michael M. Sori ◽  
Nicolas Thomas ◽  
Antoine Pommerol ◽  
Emanuele Simioni ◽  
...  
Keyword(s):  
Polar Ice ◽  
The South ◽  
Climate Record ◽  
Ice Cap ◽  
South Polar

Bellingshausen’s “Mountains”: The 1820 Russian sighting of Antarctica and Bellingshausen’s theory of the South Polar ice cap

Polar Record ◽  
2019 ◽  
Vol 55 (6) ◽  
pp. 392-401
Author(s):  
Rip Bulkeley
Keyword(s):  
English Translation ◽  
Polar Ice ◽  
The South ◽  
Ice Cap ◽  
Dronning Maud Land ◽  
South Polar

AbstractThere has been some uncertainty as to which of the two southerly probes, during which Bellingshausen passed latitude 69°S in early 1820, achieved the first sighting of an ice coast of Dronning Maud Land in Eastern Antarctica. The author criticizes Frank Debenham’s English translation of Bellingshausen’s narrative before presenting and discussing new translations of Bellingshausen’s descriptions of those events, with relevant sections of his track chart, plus a third passage from the book which interpreted what was seen. He concludes that the Russians first sighted an ice coast in mid-February, rather than late January as has been widely claimed.

Mapping the topography beneath the southern Martian polar cap using MARSIS high-resolution data

2021 ◽  
Author(s):  
Giacomo Di Silvestro ◽  
Roberto Orosei ◽  
Luca Guallini ◽  
Andrea Morelli
Keyword(s):  
Electromagnetic Waves ◽  
Learning Algorithm ◽  
Polar Ice ◽  
The South ◽  
High Resolution Data ◽  
Ice Cap ◽  
Italian American ◽  
Radar Echo ◽  
Internal Properties ◽  
South Polar

<p>The ESA Mars Express mission was launched in June 2003 and reached Martian orbit in December of the same year. Among the instruments onboard, the Italian-American radar MARSIS has retrieved valuable data, therefore contributing many discoveries related to the Red Planet, such as the evidence of sub-glacial water lakes beneath the South Pole of Mars. The technique used by this antenna is the radar echo sounding which, thanks to the electromagnetic waves emitted at frequencies in the HF range – in four separate bands centered at 1.8, 3, 4, and 5 MHz - has the ability to penetrate the ice masses, allowing the study of the internal properties and structures of glaciers and the regolith underneath.<br>Based on selected MARSIS radargrams, the main purpose of our analysis is to define the topography and main morphologies of the bedrock beneath Ultimi Lobe, part of the South Polar Ice Cap. Geologically speaking, this region is characterized by the South Polar Layered Deposits unit, widely showing complex layering and locally broad deformational structures (i.e., faults and folds). In particular, through the use of a georeferenced model of the bedrock surface, we focused on the search for low-topographies possibly consistent with basins able to contain the subglacial water reservoirs inferred by Orosei et al. (2018) and Lauro et al. (2020). Furthermore, we are implementing an algorithm focused on semi-automatic surface delineation using radar echo observations. Through the implementation of this script and retrieved data/images, we suggest that the machine-learning algorithm could be trained for further analysis.</p>

scholarly journals SPATS - A SOUTH POLE ACOUSTIC TEST SETUP

2006 ◽  
Vol 21 (supp01) ◽  
pp. 221-226 ◽  
Author(s):  
◽  
SEBASTIAN BÖSER ◽  
S. BÖSER ◽  
C. BOHM ◽  
S. HUNDERTMARK ◽  
...  
Keyword(s):  
Theoretical Calculations ◽  
Experimental Setup ◽  
Acoustic Detection ◽  
Frequency Range ◽  
Polar Ice ◽  
Glacial Ice ◽  
Test Setup ◽  
Ice Cap ◽  
The Antarctic ◽  
South Polar

Due to its large Greeneisen coefficient ice is of special interest for the acoustic detection of ultra-high energetic neutrino-induced cascades. The abundant homogeneous volume and an existing neutrino observatory make the south polar ice cap a favourable location for this purpose. Theoretical calculations yield absorption lengths of ~ 10 km, but no measurements at all are available in the frequency range of interest. We present an experimental setup to measure the key parameters of the antarctic glacial ice.

scholarly journals Ice-Breaking Fleets of the United States and Canada: Assessing the Current State of Affairs and Future Plans

2021 ◽  
Vol 13 (2) ◽  
pp. 703
Author(s):  
Megan Drewniak ◽  
Dimitrios Dalaklis ◽  
Anastasia Christodoulou ◽  
Rebecca Sheehan
Keyword(s):  
United States ◽  
The United States ◽  
Maritime Transportation ◽  
The Arctic ◽  
Polar Ice ◽  
Northwest Passage ◽  
Ice Cap ◽  
Ice Coverage ◽  
Current State ◽  
State Of Affairs

In recent years, a continuous decline of ice-coverage in the Arctic has been recorded, but these high latitudes are still dominated by earth’s polar ice cap. Therefore, safe and sustainable shipping operations in this still frozen region have as a precondition the availability of ice-breaking support. The analysis in hand provides an assessment of the United States’ and Canada’s polar ice-breaking program with the purpose of examining to what extent these countries’ relevant resources are able to meet the facilitated growth of industrial interests in the High North. This assessment will specifically focus on the maritime transportation sector along the Northwest Passage and consists of four main sections. The first provides a very brief description of the main Arctic passages. The second section specifically explores the current situation of the Northwest Passage, including the relevant navigational challenges, lack of infrastructure, available routes that may be used for transit, potential choke points, and current state of vessel activity along these routes. The third one examines the economic viability of the Northwest Passage compared to that of the Panama Canal; the fourth and final section is investigating the current and future capabilities of the United States’ and Canada’s ice-breaking fleet. Unfortunately, both countries were found to be lacking the necessary assets with ice-breaking capabilities and will need to accelerate their efforts in order to effectively respond to the growing needs of the Arctic. The total number of available ice-breaking assets is impacting negatively the level of support by the marine transportation system of both the United States and Canada; these two countries are facing the possibility to be unable to effectively meet the expected future needs because of the lengthy acquisition and production process required for new ice-breaking fleets.

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