Australian scientists aboard RSV Nuyina reported unusual elephant seal deaths on sub-Antarctic Heard Island, showing signs consistent with H5 avian influenza. If confirmed, it would be the first recorded H5 detection in an Australian sub-Antarctic territory.
Antarctic iceberg A23a, which calved from the Filchner-Ronne Ice Shelf in 1986, is rapidly breaking apart in the South Atlantic as of early September 2025, leaving fragments up to 400 km2 (154 mi2) adrift.
Antarctica has shown a rare shift in behavior, gaining ice mass between 2021 and 2023 after years of steady decline. Using satellite gravimetry, researchers tracked this anomaly and linked it to unusual precipitation rather than long-term change. The findings offer insight into the continent’s sensitivity but little certainty about what comes next.
A recent study analyzing data from 1980 to 2020 found that atmospheric rivers (ARs), though infrequent, have accounted for up to 70% of extreme snowfall events in East Antarctica since the 1980s, significantly impacting the continent’s ice sheet mass balance.
An international team exploring the seafloor after iceberg A-84 broke off the George VI Ice Shelf in January 2025 discovered a previously unseen ecosystem, raising questions about how life adapts to some of the harshest environments on the planet. Since the area became accessible, at least six new species have been identified in the region.
The world’s largest iceberg, A23a, ran aground near the sub-Antarctic island of South Georgia on March 1, 2025. The iceberg remains stationary approximately 90 km (56 miles) from land, raising concerns about its potential impact on marine ecosystems and navigation.
The world’s largest iceberg, A23a, is steadily approaching South Georgia, a British overseas territory. The iceberg is currently about 280 km (173 miles) from the island and could make contact within 2 to 4 weeks.
A recent study showed a significant decline in the navigability of the Northwest Passage, Arctic Archipelago due to obstructions caused by multilayer ice in the region.
Surface temperatures in parts of Antarctica have surged nearly 30 °C (54 °F) above normal recently, causing what scientists call an Antarctic “heatwave.” This temperature anomaly is described as “a near-record (or record) event for the region” by Edward Blanchard, an atmospheric scientist at the University of Washington.
The National Weather Service (NWS) office in Fairbanks issued multiple Severe Thunderstorm Warnings on June 27, 2024, as severe thunderstorms began to stretch over Northern Alaska and the Arctic Circle. These storms generated winds of up to 80 km/h (50 mph) and quarter-sized hail.
