Keith Makinson

@keithmakinson.bsky.social

Polar Oceanographer and Subglacial Access Drilling Engineer at British Antarctic Survey @bas.ac.uk Ice Shelves | Ocean | Tides | Ice Streams | Subglacial Lakes | Hot Water Drilling | Ice Drilling | Running |

Here’s some fantastic thermal drone imagery of a thermal spring in East Greenland. Captured by Eva Nielsen earlier this month. The spring water is 53C, flowing down a rock wall behind the field team. Our HotBlink project is funded by the Independent Research Fund of Denmark.

That's a wrap on the 2025/26 Antarctic science season! Our teams worked on 50+ projects across five research stations, in the deep field, and at sea – from climate science to wildlife monitoring. Here's a look back at (some of) what we got up to... 🧵1/9

Bild

Thwaites Eastern Ice Shelf heading for collapse. Monthly average velocities Jan 2025 to Feb 2026 derived from EU Copernicus Programme Sentinel-1 SAR data. Grounding lines in black and yellow from NASA MEaSUREs

To go under Thwaites Glacier, the only way is through ⬇️ This intrepid UK-Korean science team are tunnelling 1000m through one of the world's most unstable ice shelves. They'll get daily data showing how warm ocean water is melting Thwaites from below - crucial for predicting sea level rise.

We've had a Very Important Ice delivery! These precious ancient ice core samples from Antarctica are expected to reveal a climate record stretching back more than 1.5 million years 🤯 That's further than we've ever looked back before. 🧵 1/4

Liz stands in a walk-in scientific freezer, wearing a warm jacket. She's holding a long ice sample - a narrow stick of ice about a metre long and only a few centimetres wide. It's from a box containing many ice cores. Photo credit: Jamie Oliver, BAS.

This is almost unbelievable. It's now May and there is still virtually no new sea ice forming in the Bellingshausen Sea (lower left region in image). Image showing sea ice concentration derived from AMSR satellite data is by Institute of Environmental Physics, University of Bremen, Germany.

Bild

Year-end scramble getting you down? ⏳ Applications for lots of our Antarctic #jobs are closing in the next week. They include vehicles manager at Halley, and Radio Operator and IT Engineer at Rothera Research Station. These are jobs unlike any other, in one of the most beautiful places on Earth ⬇️

Seriously remote work, in Antarctica. The photo is of Halley Research Station, stretching into the distance on a flat white polar landscape, with the label 'Today's Office'

Iceberg A23a pictured from the ISS. The space station is almost as far south as it can reach here (51.5° S, 49.0° W - altitude of 422km). Picture taken on 14 March, so the berg had been grounded at South Georgia for a fortnight by this time.

NASA/JSC/ISS

The world's largest iceberg, A23a, appears to have grounded close to South Georgia. We've been monitoring and mapping this berg for many years now and we're watching closely to see what it might do next! These maps show its route since 1986 and the latest position to the SW of South Georgia ❄️🐧 1/3

A map of the recent positions of iceberg A23a from 17th Jan - 3rd March 2025. Bathymetry is shown on the map, with shallow shelf areas indicating where the iceberg is stuck on the seafloor.A map showing the track of iceberg A23a from calving (breaking off) the Filchner Ice Shelf in 1986, to its most recent position SW of South Georgia. The track is shown with purple dots. Bathymetry is shown with a blue colour ramp.

A new iceberg, ~30x14 km in size, recently calved from the southern end of the George VI Ice Shelf. It's called A84 and is already making quite an impact, bumping into the Stange Ice Shelf over the weekend! These Copernicus Sentinel-1 images from Polar View show the new berg over the last few days.

Beautiful Sentinel-2 imagery of George VI Ice Shelf with lots of meltwater from yesterday. The patterns that this water produces is like artwork! Fossil Bluff is shown in the second image, and Hodgson Lake shown in the last - a former subglacial lake sealed under ice thick perennial ice ❄️

A satellite image showing lots of meltwater pool on an ice shelf in the centre, and rocky outcrops on the left (west) on Alexander Island, and Palmer Land on the right (east).Fossil Bluff region on Alexander IslandHodgson Lake, Citadel Bastion and Corner Cliffs on Alexander Island.
E

Important paper in Nature today about collapse of the West Antarctic Ice Sheet. There is a positive isotope anomaly at Skytrain Ice Rise during the last interglacial, consistent with what we found in our high-resolution water-isotope simulations when WAIS collapses. www.nature.com/articles/s41...

The Ronne Ice Shelf survived the last interglacial - Nature

Sea salt data from an ice core record show that Antarctica’s Ronne Ice Shelf survived the last interglacial, the last period of enhanced and sustained global warmth about 125,000 years ago.

nature.com