Erebus Ice Tongue

Erebus Ice Tongue. It is a distinctive glacier tongue projecting from the coast of Ross Island into McMurdo Sound. This floating extension of the Erebus Glacier is a prominent landmark in the Ross Sea region, known for its dramatic tabular form and persistent presence. Scientific study of this feature provides critical insights into glaciology, marine ecology, and the dynamics of the Antarctic cryosphere.

Geography and location

The ice tongue extends approximately 12 kilometers northward from the coastline of Ross Island into the frigid waters of McMurdo Sound. It is situated near several major Antarctic research stations, including McMurdo Station operated by the United States Antarctic Program and Scott Base managed by Antarctica New Zealand. The feature lies to the west of Mount Erebus, the southernmost active volcano on Earth, and is bordered by the Ross Ice Shelf to the south. Its position makes it a significant navigational feature for vessels, such as those operated by the United States Coast Guard, servicing the Antarctic Peninsula and surrounding areas.

Formation and characteristics

This structure forms as the terminal section of the Erebus Glacier, a valley glacier flowing from the slopes of Mount Erebus. As it reaches the Ross Sea, the ice continues to advance over the ocean, forming a floating, tabular ice tongue. The feature is characterized by its nearly vertical cliffs, which can rise up to 50 meters above the waterline, and a thickness ranging from 50 to 150 meters. Its stability is maintained by a balance between the ice flow from the grounded glacier and the calving of icebergs at its terminus, a process studied extensively by organizations like the British Antarctic Survey and the Alfred Wegener Institute.

Research and exploration

The ice tongue has been a site of scientific interest since the heroic age of Antarctic exploration, with early observations recorded during expeditions led by Robert Falcon Scott and Ernest Shackleton. Modern research involves monitoring its dynamics using satellite imagery from agencies like NASA and the European Space Agency. Field studies conducted from McMurdo Station and by teams from the Italian National Antarctic Research Programme have drilled ice cores to analyze climate history. Oceanographic research by vessels like the RVIB Nathaniel B. Palmer investigates the interaction between the ice and the underlying waters of the Southern Ocean.

Ecological significance

The submerged base of the ice tongue provides a critical habitat for a unique assemblage of Southern Ocean fauna. The ice acts as a substrate for communities of algae and invertebrates, which in turn support higher trophic levels. The area is an important foraging ground for species like the Weddell seal and Emperor penguin. Researchers from the Australian Antarctic Division and the National Institute of Water and Atmospheric Research have documented rich benthic ecosystems in its shadow, which are studied as analogs for potential life on icy worlds like Europa.

Threats and changes

Like many polar features, the ice tongue is subject to changes influenced by broader climatic patterns. While historically stable, it is vulnerable to shifts in Southern Annular Mode and warming linked to phenomena like the El Niño–Southern Oscillation. Increased calving events could be influenced by warmer ocean currents, such as those documented by the Integrated Ocean Drilling Program. Long-term monitoring by the Scientific Committee on Antarctic Research is essential to understand its resilience within the changing Antarctic Treaty System environment and its role in regional sea level rise contributions.

Category:Glaciers of Ross Island Category:McMurdo Sound