Antarctica – Page 3 – Desdemona Despair

Deep water underneath the Thwaites ice shelf front is lighter than water outside the ice shelf. (A) Map of trough T3 showing the AUV path color coded by latitude. Shaded region indicates the ice shelf front, and black contours are depth contours. (B) Conservative temperature θ (in degrees Celsius) versus absolute salinity SA (in grams per kilogram) for the AUV data points shown in (A), colors as in (A). Contours show potential density (9) relative to 900 m, and blue arrow indicates isopycnal mixing, i.e., water that has the same density but different temperatures and salinities. Green circles in (A) and (B) show the dense saline deep water found in trough T3 discussed in the main text. (C) Absolute salinity SA (in grams per kilogram) as a function of depth for the AUV data in trough T3 and the CTD data (colors indicate station as in Fig. 3). (D) Potential density (in kilograms per cubic meter) as a function of depth for the AUV data in trough T3 and the CTD data (colors indicate station as in Figs. 3 and 4). Red and blue arrows indicate the two deep water masses discussed in the main text from Pine Island Bay and Thwaites Trough. Dissolved oxygen versus θ and SA is shown in fig. S6. Graphic: Wåhlin, et al., 2021 / Science Advances

April 11, 2021

Exploration of ocean currents beneath the “Doomsday Glacier” by an autonomous underwater vehicle – Net melting of 75 cubic km of ice per year means “the glacier is not stable over time”

9 April 2021 (University of Gothenburg) – For the first time, researchers have been able to obtain data from underneath Thwaites Glacier, also known as the “Doomsday Glacier”. They find that the supply of warm water to the glacier is larger than previously thought, triggering concerns of faster melting and accelerating ice flow. With the […]

Observed sea-level rise in Rockport, Texas, 1969-2020 and projected to 2050. Rockport has the second-highest annual rise rate (7.1 mm/year in 2020), and the highest projected sea-level rise for 2050 at 0.82 meters (2.69 ft) above mean sea level in 1992. Graphic: VIMS

February 28, 2021

U.S. sea-level report cards: 2020 again trends toward acceleration – Water levels at 26 of 32 stations rose at higher rate than in 2019

By David Malmquist 24 January 2021 (VIMS) – Sea level “report cards” issued annually by researchers at William & Mary’s Virginia Institute of Marine Science add further evidence of an accelerating rate of sea-level rise during 2020 at nearly all tidal stations along the U.S. coastline. The team’s web-based report cards project sea level to […]

Surface air temperature anomaly for February 2020 relative to the average for the period 1981-2010. Data: ERA5. Graphic: Copernicus Climate Change Service / ECMWF

March 5, 2020

The boreal winter season 19/20 was by far the warmest winter season ever recorded in Europe – “Europe has been experiencing its mildest winter on record”

4 March 2020 (C3S) – With persistent mild weather over Europe, particularly in the north and east, the past winter was 3.4 °C warmer than the average winter for the period 1981-2010. The temperature was almost 1.4°C higher than that of the previous warmest winter, 2015/16. Back in November C3S seasonal predictions provided strong indications […]

Satellite images acquired by the Operational Land Imager (OLI) show melting on the ice cap of Eagle Island, Antarctica on 4 February 2020 and 13 February 2020. Photo: Joshua Stevens / NASA Earth Observatory

February 21, 2020

Image of the Day: Antarctica melts under its hottest days on record

By Kasha Patel 21 February 2020 (NASA) – On 6 February 2020, weather stations recorded the hottest temperature on record for Antarctica. Thermometers at the Esperanza Base on the northern tip of the Antarctic Peninsula reached 18.3°C (64.9°F)—around the same temperature as Los Angeles that day. The warm spell caused widespread melting on nearby glaciers. The warm […]

Global surface temperature anomalies, 1880-2019, compared with the 1880-1899 average. The year 2019 was the second warmest year on record, capping the warmest decade since measurements began. Data: Gavin Schmidt / NASA GISTEMP. Graphic: InsideClimate

January 7, 2020

2010-2019: Earth’s hottest decade on record marked by extreme storms, deadly wildfires – “The climate of the 20th Century is gone. We’re in a new neighborhood.”

By Bob Berwyn 19 December 2019 (InsideClimate News) – Deadly heat waves, wildfires and widespread flooding punctuated a decade of climate extremes that, by many scientific accounts, show global warming kicking into overdrive. As the year drew to a close, scientists were confidently saying 2019 was Earth’s second-warmest recorded year on record, capping the warmest […]

The pattern of normalized relative sea-level (RSL) from Glacial Isostatic Adjustement (GIA) simulations of a 20-m rise in eustatic sea level (ESL). Graphic: Grant, et al., 2019 / Nature

October 14, 2019

If warming exceeds 2°C, Antarctica’s melting ice sheets could raise seas 20 meters in coming centuries

By Georgia Rose Grant and Timothy Naish 2 October 2019 (The Conversation) – We know that our planet has experienced warmer periods in the past, during the Pliocene geological epoch around three million years ago. Our research, published today, shows that up to one third of Antarctica’s ice sheet melted during this period, causing sea levels to rise […]

Linkages between Amundsen Sea winds and global SST and SLP. Time series of zonal wind and zonal total stress over the PITT box, the SOI and the IPO. The legend shows the unit for each time series, and scaling for the axis values where appropriate. Graphic: Holland, et al., 2019 / Nature Geoscience

August 15, 2019

First evidence of human-caused climate change melting the West Antarctic Ice Sheet

12 August 2019 (British Antarctic Survey) – A new study published this week reveals the first evidence of a direct link between human-induced global warming and melting of the West Antarctic Ice Sheet. UK-US researchers say that curbing greenhouse gas emissions now could reduce the future sea-level contribution from this region. Ice loss in West […]

Stability diagram of the West Antarctic Ice Sheet (WAIS), rate R versus duration T of mass addition with unstable regime in red and stable regime in blue. Interpolation of the field is based on the conducted ensemble of stabilization experiments (gray circles). The critical threshold Rc (white curve) of stabilization is approximated by function given at the top right corner. White stars highlight simulations that share the same total amount of deposited mass (M = 8000 Gt), added at differing rate and duration, showing that the combination of both determines potential stabilization. Graphic: Feldmann, et al., 2019 / Science Advances

July 23, 2019

Adding 8 trillion tons of artificial snow to the West Antarctic Ice Sheet could stop it from collapsing – “The fundamental trade-off is whether we as humanity want to sacrifice Antarctica to save the currently inhabited coastal regions”

By Katherine J. Wu 17 July 2019 (PBS) – Gird your loins, humans: The time has come to turn part of the South Pole into our own giant snow globe. Or has it? In a study published today in the journal Science Advances, a team of German researchers suggests that dumping 8 trillion tons of artificial snow onto […]

Hurtigruten’s cruise ship MS Roald Amundsen is seen in the sea near Ulsteinvik, Norway, on 1 July 2019. The Roald Amundsen is the world’s first cruise ship propelled partially by battery power and is set to head out from northern Norway on its maiden voyage, cruise operator Hurtigruten said on Monday. The hybrid expedition cruise ship can take 500 passengers and is designed to sail in harsh climate waters. Named after the Norwegian explorer who navigated the Northwest Passage in 1903-1906 and was first to reach the South Pole in 1911, the ship heads for the Arctic from Tromsø this week and will sail the Northwest Passage to Alaska before heading south, reaching Antarctica in October 2019. Photo: Hurtigruten / Reuters

July 6, 2019

First hybrid electric cruise ship sails for the Arctic

By Victoria Klesty 1 July 2019 OSLO (Reuters) – The world’s first cruise ship propelled partially by battery power is set to head out from northern Norway on its maiden voyage, cruise operator Hurtigruten said on Monday. The hybrid expedition cruise ship, the Roald Amundsen, can take 500 passengers and is designed to sail in […]

Global sea level rise with the Thwaites Glacier and the ice of the West Antarctic Ice Sheet. Graphic: PRI

May 27, 2019

Scientists race against time to find out if Antarctica’s Thwaites Glacier is doomed – “This is where rapid change is really happening, and we’re actually standing and looking at the bit that’s rapidly changing”

By Carolyn Beeler 13 May 2019 (PRI) – Peter Sheehan, an oceanographer on the Nathaniel B. Palmer, was one of the first people on Earth to get this view of Thwaites Glacier — the part that juts out to sea. He’s pored over plenty of Google images of ice shelves, but there’s nothing like the […]