Unnamed island off the Glenzer and Conger ice shelves in East Antarctica. November 15, 1989– January 9, 2022
An unnamed mound of white off East Antarctica appears to be an island.
The eastern coast of Antarctica has actually lost most of the Glenzer and Conger ice shelves. At the same time, it gained what is likely an island. The unnamed island would be one in a series of islands exposed in current years as portions of the drifting glacial ice hugging the continents coast have disintegrated if verified.
The candidate island is visible in the above triptych of images acquired by Landsat satellites in between 1989 and 2022 The images are a combination of shortwave infrared and noticeable light, and were adjusted for consistency in brightness and color. Notification how the island has actually preserved the same shape, even after shelf ice separated from it, and as sea ice around it waxed and waned. That round white mound has not budged, even after large icebergs most likely smashed into it following the rapid collapse of the Glenzer and Conger ice shelves previously this year.
The feature likewise appears taller than its environments. The elevation profile listed below shows that a minimum of part of the mass stands 30 to 35 meters (100 to 115 feet) above the surface of the sea. The data were obtained on December 22, 2021, with the Advanced Topographic Laser Altimeter System (ATLAS) on NASAs Ice, Cloud, and land Elevation Satellite 2 (ICESat-2).
If confirmed, the unnamed island would be one in a series of islands exposed in recent years as portions of the floating glacial ice hugging the continents coast have actually disintegrated.
Notification how the island has actually maintained the exact same shape, even after rack ice separated from it, and as sea ice around it subsided and waxed. Gibson called the ice island “self-perpetuating,” indicating that snow and ice collecting on the islands surface area balances out the amount of melting that happens underwater. Conventional or ice, the island is the newest in a bunch of similar features that are no longer embedded in Antarcticas floating glacial ice. And in 2020, researchers on a ship-based exploration discovered a little, rocky island capped with ice that might have been part of Pine Island Glaciers ice rack.
December 22, 2021– January 9, 2022.
Simply due to the fact that a feature acts like an island and looks like an island, does not indicate it is an island– at least not in the conventional sense. Scientists are still uncertain if there is any strong earth breaching the sea surface below all of the snow and ice.
John Gibson, a researcher with the Australian Antarctic Division, believes the function is likely an ice island: a big, heavy cap of ice sitting sturdily on an undersea peak. “It is certainly comparable to other ice islands, such as Bowman Island,” Gibson said.
Gibson called the ice island “self-perpetuating,” implying that snow and ice accumulating on the islands surface balances out the quantity of melting that takes place underwater. The ice island might thin and float away if that balance becomes interfered with by a decrease in snowfall. “The unnamed island is a more-or-less permanent function of the landscape,” Gibson stated, “but might someday remove from the underlying rock and become an iceberg.”
Without anybody having existed to observe the island, questions stay about its structure. “To be absolutely sure, you would require to put a ship next to it to inspect for a bedrock outcrop, and maybe a radar over it to evaluate the ice density,” said Christopher Shuman, a University of Maryland, Baltimore County, glaciologist based at NASAs Goddard Space Flight Center. “The ICESat-2 profile shows that the surface area is well above water level. That would be a whole lot of ice cream above the cone if there wasnt bedrock at or above water level.”
Standard or ice, the island is the most recent in a lot of comparable features that are no longer embedded in Antarcticas drifting glacial ice. In 2019, the U.S. Board on Geographic Names recognized Icebreaker Island, which in 1996 became separated from the Larsen B Ice Shelf along the Antarctic Peninsula. And in 2020, researchers on a ship-based expedition found a small, rocky island capped with ice that might have become part of Pine Island Glaciers ice rack.
” The discovery of more of them is likely to continue in the years ahead due to shrinking glacial and sea ice,” Shuman stated. “Obviously these are new to us features, but we also have more people and more tools to look at the margins of Antarctica now. A number of examples do not make a trend, but they do suggest that other once-hidden functions are likely to be discovered in the years to come.”
NASA Earth Observatory images by Joshua Stevens, utilizing Landsat information from the U.S. Geological Survey, and ICESat-2 data from the National Snow & & Ice Center. Story by Kathryn Hansen, with information from Christopher Shuman (NASA GSFC/UMBC JCET).
