iiinova — where your digital self keeps evolving

Additionally, we highlight the complexity and localised behaviour of recent and shorter timescale Southern Hemisphere Westerlies changes, with implications for future research.

011

Reposted by Stephen Roberts

Our results suggest stronger Southern Hemisphere Westerlies at Macquarie Island from ~2500–2300 cal yr. BP and after ~800 cal yr. BP, and relatively weaker Southern Hemisphere Westerlies between ~2300–800 cal yr. BP. Superimposed on this long-term trend are centennial-scale fluctuations.

Reposted by Stephen Roberts

Here we demonstrate a direct reconstruction method that provides a robust framework for reconstructing past wind variability, with the broader aim of improving our understanding of past Southern Hemisphere Westerlies behaviours.

Reposted by Stephen Roberts

As an important component of the Earth's system, changes in the Southern Hemisphere Westerlies profoundly impact climate and the ocean-cryosphere-atmosphere domains.

Reposted by Stephen Roberts

In this research, we used halophilic and halophobic diatoms to reconstruct the Southern Hemisphere variability on subantarctic Macquarie Island during the last 2500 years, by exploiting the wind-driven sea spray and lake conductivity relationship.

Stephen Roberts @stever60.bsky.social · 11/04/2026

Excellent new paper by @yqnatdeng.bsky.social in The Holocene this week using diatoms from a lake sediment core from Macquarie Island to reconstruct past changes in lake water conductivity and Southern Hemisphere Westerly winds … @bas.ac.uk @uclgeography.bsky.social @antarctic.bsky.social

A 3 part figure a) Map of the Southern Ocean showing the Southern Hemisphere Westerly winds encircled Antarctica b) a satellite picture of Macquarie Island c) a summary map of Lake Tiobunga

A plot of diatom species against time for the last 2500 years found in Lake Tiobunga sediments compared to the 1000-year reconstructed Southern Annular Mode (SAM) index

Stephen Roberts @stever60.bsky.social · 01/03/2026

Early view of our new high-resolution sub-Antarctic islands peat geochemistry calibration paper in press @Nature Scientific Reports … www.nature.com/articles/s41...

View of site HER42PB on the western cliff edge of Isla Hermite, near Cape Horn

A four part figure for Figure 1 from our new paper showing (a) the locations of the four islands we samples peat from in the Southern Ocean, (b) an example surface Core Image and downcore XRF core scanning Ti counts per second downcore from site HER42PB, (c-f) location maps showing sample site on Bird Island, Isla Hermite, Kerguelen Island, and Marion Island

Photo of some peat cores collected from a peat coring site on Crozet Island (credit FDV)

A complicated figure for Figure 4 from our new paper showing a several downcore proxy records from the sampling sites - illustrating the good downcore coherence between high resolution XRF core scan data and ICP-MS subsample data and the conversion of XRF core scan data into quantitative concentrations

110

Stephen Roberts @stever60.bsky.social · 01/11/2025

Spectacular ending to the annual Cambridge Bonfire Night fireworks display tonight …

Stephen Roberts @stever60.bsky.social · 01/11/2025

Short Article for the BAS IceSheet Newsletter Oct/Nov 2025 … Ancient tsunamis and storms in the Shetlands Islands See link for article: www.linkedin.com/posts/stephe...

Collage showing a map of the Shetland Islands in the top left, a map of Loch Flugarth and core sites and sampling locations top right, a sediment core from the centre of the loch bottom left, coring in a small boat on the loch middle bottom, and GPS surveying and measuring retaining sill altitudes bottom right

Stephen Roberts @stever60.bsky.social · 31/10/2025

British Antarctic Survey supervisors are involved in 20 Iapetus DTP PhD projects this year - 6 based at BAS, 14 at one of the Iapetus DTP univeristy partners. Full list and how to apply are in this link : www.linkedin.com/posts/stephe...

linkedin.com

Studentship Competition | Stephen Roberts

British Antarctic Survey supervisors are involved in 20 Iapetus DTP PhD projects this year - 6 based at BAS, 14 at one of the Iapetus DTP univeristy partners - see below for a full list and please for...

000

Stephen Roberts @stever60.bsky.social · 10/10/2025

Applications are now open for this years’ @iapetusdtp.bsky.social PhD projects … including this one investigating ice sheet and glacier history of the Sør Rondane Mountains in East Antarctica by developing in-situ 14C cosmogenic exposure dating methods - more here: iapetus.ac.uk/studentships...

Black and white landscape photo of the Sør Rondane mountains in East Antarctica

Black and white photo of three people on top of the Utsteinen Nunatak in the Sor Rondane mountains in East Antarctica - some of the samples in this project were taken from this massif and its surrounding moraine

A black and white landscape photo of the Utsteinen Nunatak in the Sør Rondane mountains in East Antarctica taken while collecting cosmogenic exposure dating samples from the Teltet Nunatak

Black and white photo of two people walking across blue ice of the East Antarctic ice sheet surrounding the Sor Rondane mountains

185

Reposted by Stephen Roberts

Keir Nichols @cosmokeir.bsky.social · 09/10/2025

Applications are now open for a Glasgow-based Iapetus DTP project centred on using in situ 14C to study glacier histories in East Antarctica! tinyurl.com/3ddvynn2 @stever60.bsky.social @uofglasgow.bsky.social @iapetusdtp.bsky.social @bas.ac.uk

A person standing on a moraine which is in front of a mountain. The mountain is in East Antarctica, with a small glacier between the mountain and moraine. The person is using a saw to collect a rock sample from the surface of a boulder on top of the moraine.

A photo taken from a mountain in East Antarctica, with moraines and blue ice in the foreground, and the vast East Antarctic Ice Sheet extending to the horizon. Some small mountains (nunataks) are poking out above the surface of the ice sheet at varying distances.

077

Stephen Roberts @stever60.bsky.social · 08/10/2025

Applications are now open for this years’ BAS Iapetus PhD projects … including one working on our Big Thaw project investigating extreme precipitation in Nepal from sediment core and climate data - more details in this link @iapetusdtp.bsky.social @bas.ac.uk iapetus.ac.uk/studentships...

Photo of Lake Tilicio in Nepal with an inset core showing our team collecting sediment cores from the lake

045

Reposted by Stephen Roberts

Max Engel @drmaex.bsky.social · 23/09/2025

After a solid week of lake coring and sampling for #storm and #tsunami deposits on the #Shetland Islands, we found this yet undocumented gem 💎 on northern Mainland - a distinct gravel layer inside the coastal dunes. Hoping for good OSL results 🤞🏽

193

Reposted by Stephen Roberts

Max Engel @drmaex.bsky.social · 17/09/2025

Indeed, Loch Flugarth #ShetlandIslands is a beauty on the inside AND the outside! @stever60.bsky.social @uniheidelberg.bsky.social

Sand Voe bay connected to Loch Flugarth on northern Mainland in the Shetland Islands; photograph with a rainbow

Russian chamber corer with laminated lake deposits from Loch Flugarth

071

Stephen Roberts @stever60.bsky.social · 20/09/2025

Lake coring in the Shetland Islands last week, looking for ancient tsunamis with @drmaex.bsky.social @uniheidelberg.bsky.social @bas.ac.uk

011

Stephen Roberts @stever60.bsky.social · 19/09/2025

New exciting new global lake sediment temperature calibration paper and dataset by @geochemem.bsky.social, including the first 5- and 6-methyl brGDGTs measured in lake sediments from Antarctica - eg Fan Lake. See link for details: doi.org/10.1016/j.qu... @bas.ac.uk @iapetusdtp.bsky.social

A map of the world showing the locations of over 400 lakes whose surface sediments were analysed for biomarker compounds called branched glycerol dialkyl glycerol tetraethers (brGDGTs) are a group of temperature-sensitive membrane lipids found in bacteria that have been widely used in palaeo-temperature reconstruction. The paper expands existing calibration datasets, and evaluates calibration models constructed using a range of statistical modelling approaches

A slide showing Fan Lake on Annenkov Island near South Georgia - sediments from the surface of a core taken from the bottom of the lake were analysed along with sediments from over 400 lakes around the world the construct a new global calibration model which can be used to reconstruct past changes in lake sediments over thousands of years

131

Stephen Roberts @stever60.bsky.social · 17/09/2025

Second Scottish lake coring adventure of the summer … this time up to the Shetland Islands looking for ancient storms and tsunamis in lake sediments with @drmaex.bsky.social

Coring on Loch Flugarth north mainland Shetland - photo taken by Susie who lives in the house on the far right of this view of the loch looking at hills in the distance with a white houses

3 people in a small red boat on Loch Flugarth

View of Loch Flugarth from a large boulder with a rope tied to it towards some hills in the distance

A picture of the farm cat who lives near to Loch Flugarth