iiinova — where your digital self keeps evolving

Joseph Cresswell @joecresswell.bsky.social · 04/09/2026

- Records of organic based paleo productivity proxies (total organic carbon and total alkenones) show evidence of preservation bias under changing bottom water oxygen concentrations during the deglaciation.

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Joseph Cresswell @joecresswell.bsky.social · 04/09/2026

- Mechanisms controlling iron delivery in the Indian SAZ varied spatially with lateral advection of terrigenous material from the Kerguelen Plateau increasing iron delivery at downstream sites by ~8 times relative to sites dominated by background aeolian input.

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Joseph Cresswell @joecresswell.bsky.social · 04/09/2026

Key findings: - Iron fertilisation increased in the Indian SAZ during the last glacial maximum, likely stimulating enhanced carbon export via the biological pump.

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Joseph Cresswell @joecresswell.bsky.social · 04/09/2026

Delighted to share our new paper titled: Glacial-Interglacial Shifts in Export Productivity and Iron Flux in the Indian Sector of the Southern Ocean doi.org/10.1029/2025... #LGM #Paleoclimate #SouthernOcean #geochemistry #published

doi.org

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Joseph Cresswell @joecresswell.bsky.social · 12/02/2026

What made #CliC2026 particularly special were the perspectives of indigenous communities, their participation in scientific research and methods of storytelling. This reinforced the fact that science is only as good as its impact. Thankyou @clicwcrp.bsky.social

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Reposted by Joseph Cresswell

Prof Helen Bostock @oceanhelen.bsky.social · 12/02/2026

PhD opportunity for an Australian or New Zealand student (or someone currently studying in Australia) to study nano-microplastic contamination at University of Queensland with a wonderful colleague of mine Dr Elvis Okoffo. Also with Prof Kevin Thomas and Cassandra Rauert.

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Joseph Cresswell @joecresswell.bsky.social · 11/02/2026

Great to share part of my research at CLIC in Wellington. 📈 Indian SAZ Iron and productivity increase during periods of low atmospheric CO2 (MIS4, late MIS3 and LGM) 🌏 Spatially heterogenous mechanisms of iron input at inter-basin and regional scales (dust, localised lateral advection and IRD)

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Joseph Cresswell @joecresswell.bsky.social · 05/02/2026

While working remotely in New Zealand I have been fortunate to have explored the amazing range of geology here. From volcanos to glaciers and mountain huts to river caverns. I'm now looking forward to CLIC 2026 conference in Wellington!

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Reposted by Joseph Cresswell

Andrej Spiridonov @andrejpaleo.bsky.social · 06/01/2026

Interesting! "Fossils in storm beds plus paleoclimate modelling reveal a seasonal, nearshore setting like that of modern horseshoe crabs." www.sciencedirect.com/science/arti... 🧪 #Geology ⚒️ #Paleobio #EvoBio

Horseshoe crab body and trace fossils from AlUla, along with modern horseshoe crab traces.

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Reposted by Joseph Cresswell

Ed Hawkins @edhawkins.org · 06/01/2026

Published today: Importance of beginning industrial-era climate simulations in the eighteenth century Defining pre-industrial to be 1750, rather than 1850, produces different (simulated) historical climate changes after 1850. Pre-1850 volcanoes & land use matter. iopscience.iop.org/article/10.1...

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Joseph Cresswell @joecresswell.bsky.social · 05/12/2025

Hi! Thanks for the link. - I'm open to a broad range of paleoclimate topics, ideally utilising my existing geochemical skills plus new methodologies (perhaps more 'hard-rock' geology). - Location - short term Australia or NZ, from 2027 I am avaliable for more global opportunites.

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Joseph Cresswell @joecresswell.bsky.social · 02/12/2025

PhD highlights include: - Presenting a poster at ICP-15 in India - Participating in the 2025 CAPSTAN voyage aboard R.V Investigator - Attending the two-week 2023 ECORD paleoclimate summer school @marumunibremen.bsky.social - Remote laboratory work at University of Rhode Island for N15 analysis

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Joseph Cresswell @joecresswell.bsky.social · 02/12/2025

- Measured foraminifera bound nitrogen isotopes to assess the impact of iron fertilised productivity toward the efficiency of the biological pump and net carbon draw down - Utilised redox sensitive elements to record changes in past bottom water oxygenation

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Joseph Cresswell @joecresswell.bsky.social · 02/12/2025

- Reconstructed spatial variability of mechanisms of iron input in the SO during the last glaciation using 230Th normalised fluxes of iron and lithogenics - Reconstructed paleo-productivity trends through utilising organic and non-organic based productivity proxys to account for preservation bias

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Joseph Cresswell @joecresswell.bsky.social · 02/12/2025

Hi, I'm Joe a 4th year PhD student @utas.edu.au who is currently looking for a post-doc! My research has focused on reconstructing paleo-productivity and iron fertilisation in the Indian sector across the last 100 ka. Here’s what I've been up to across the last 4 years:

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Joseph Cresswell @joecresswell.bsky.social · 02/12/2025

PhD highlights include: - Presenting a poster at ICP-15 in India. - Participating in the 2025 CAPSTAN voyage aboard R.V Investigator. - Attending the two week 2023 ECORD paleoclimate summer school @marumunibremen.bsky.social. - Remote laboratory work at University of Rhode Island for N15 analysis.

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Joseph Cresswell @joecresswell.bsky.social · 02/12/2025

- Measured foraminifera bound nitrgoen isotopes to assess the impact of iron fertilised productivity toward the efficiency of the biological pump and net carbon draw down. - Utilised redox sensitive elements to record changes in past bottom water oxygenation.

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Joseph Cresswell @joecresswell.bsky.social · 02/12/2025

- Reconstructed spatial variability of mechanisms of iron input in the SO during the last glaciation using 230Th normalised fluxes of iron and lithogenics. - Reconstructed paleo-productivity trends through utilising organic and non-organic based productivity proxys to account for preservation bias.

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Reposted by Joseph Cresswell

Douwe van Hinsbergen @vanhinsbergen.bsky.social · 06/11/2025

Utrecht Paleogeography model in prep! We're integrating our detailed reconstructions of orogenic belts and lost subducted plates into one plate tectonic and paleogeography model. We'll launch the updated Paleolatitude.org soon, and more tools for geodynamic, paleoclimate, and paleobiology studies!

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Joseph Cresswell @joecresswell.bsky.social · 29/11/2025

This year I was privileged to have been awarded a postgraduate project grant from @anzic.bsky.social to support foraminifera-bound Nitrogen-15 analysis from Indian sector sediment cores at the University of Rhode Island (Robinson lab).

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Joseph Cresswell @joecresswell.bsky.social · 05/09/2025

I had a great time attending my first international conference at #ICP15 in Bengaluru. Lots of great people, presentations and food! I also had a chance to present my recent work on Indian sector productivity and iron fertilisation.

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