Stephen Roberts
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stever60.bsky.social
Stephen Roberts
@stever60.bsky.social
780 followers 770 following 62 posts
⚒️ 🧪Earth scientist / geologist reconstructing past environmental change mainly from lake sediments from Antarctica, Arctic, S. America, Nepal, UK and other places
🏡Cambridge, UK
🏳️‍🌈 he/him
Instagram @antarctic_diary
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Reposted by Stephen Roberts
drmaex.bsky.social
Collab of @stever60.bsky.social @bas.ac.uk @uniheidelberg.bsky.social #geography
September 23, 2025 at 7:52 AM
stever60.bsky.social
This is Fan Lake on Annenkov Island nr South Georgia - sediments from the top of the lake record were analysed with sediments from >400 lakes around the world to construct a new global temperature calibration model which can be used to reconstruct past changes in temperature over thousands of years
September 19, 2025 at 10:57 AM
stever60.bsky.social
See this link for more details

www.sciencedirect.com/science/arti...
Development of new global lake brGDGT-temperature calibrations: advances, applications, challenges, and recommendations
Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are a group of temperature-sensitive membrane lipids found in bacteria that have been widely …
www.sciencedirect.com
September 19, 2025 at 9:57 AM
stever60.bsky.social
Surface sediments from 400 lakes were analysed for biomarker compounds called branched glycerol dialkyl glycerol tetraethers (brGDGTs), a group of temperature-sensitive bacteria membrane lipids used in past temperature reconstructions - we expand calibration datasets, and evaluate calibration models
Map showing the location of over 400 lake sediment samples used in this new study
September 19, 2025 at 9:54 AM
stever60.bsky.social
And a big thanks to our ‘special guest stars’ Tom Bradwell and Eileen Tisdall from University of Stirling and Nicola Dakin from @bgs.ac.uk for all their help
Tom Bradwell helping out on the boat Morning tea at SCENE with Colin Adams, Iain Geldard, Jodie Geldard, Eileen Tisdall, and Tom Bradwell sat around a table in the common area Colin Adams and Tom Bradwell inflating the raft on the beach at SCENE Ellen Tisdall carrying a core back to shore along the boat jetty at the end of days’ coring
June 28, 2025 at 10:00 AM
stever60.bsky.social
A huge thanks to everyone at @sceneuog.bsky.social for hosting us - in particular Prof. Colin Adams for his phenomenal support, & Iain Geldard - we couldn’t have done it without both of you! Jodie Geldard did an amazing job organising the whole trip as part of her @iapetusdtp.bsky.social PhD
SCENE University of Glasgow research centre where we were based - photo shows the road leading up to the wooden building through the forest Collection of sediment cores taken from Loch Lomond over the last 2 weeks strapped into the van for transport to BAS and Southampton for analysis as part of Jodie Geldard’s Iapetus DTP PhD with University of Stirling Final day lunch at the oldest pub in Scotland, the Clachan with Colin Adams, Iain Geldard, Tom Bradwell, and Jodie Geldard (not in photo) Selfie With Tom Bradwell outside the sign for the Clachan in Drymen, the oldest pub in Scotland (apparently)
June 28, 2025 at 9:50 AM
stever60.bsky.social
Not everyday was like this but we had a couple of flat calm hot and sunny days out on the lake with stunning views across to Ben Lomond and surrounding mountains … which was very nice @iapetusdtp.bsky.social @bas.ac.uk
June 28, 2025 at 9:33 AM
stever60.bsky.social
Some pictures from the last couple of weeks lake sediment coring on Loch Lomond with @iapetusdtp.bsky.social
Loch Lomond at sunset with coring rig moored in sheltered bay at SCENE university of Glasgow research centre Loch Lomond view from the southern basin across to Ben Lomond Collecting cores in the middle of Loch Lomond - 4 people capping a surface core retrieved for potential fish eDNA analysis Early morning calm on Loch Lomond
June 27, 2025 at 7:31 AM