Dr Tommy Ryan-Keogh
@tjryankeogh.bsky.social
400 followers 180 following 31 posts
Ocean biogeochemist based at the Southern Ocean Carbon-Climate Observatory, South Africa
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Reposted by Dr Tommy Ryan-Keogh
zacklabe.com
August 2025 data is now available for both Antarctic sea-ice thickness/volume (zacklabe.com/antarctic-se...) and global sea-ice volume (zacklabe.com/global-sea-i...) from GIOMAS. Another monthly record low (globally)!

#DataViz #SciComm #OpenScience #OpenData 🧪🌊⚒️
Reposted by Dr Tommy Ryan-Keogh
jgroceans.bsky.social
Whilst trace metals influence ocean productivity, there are a paucity of regions where their spatial and temporal variability are well explored. Ortega et al., investigate the drivers of trace metal dynamics in the productive Northern Gulf of Alaska 🌊
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
Bathymetric map of the Northern Gulf of Alaska Long Term Ecological Research (NGA LTER) site
Reposted by Dr Tommy Ryan-Keogh
tracemetalclean.bsky.social
🌊New paper out using 7Be to constrain global atmospheric deposition.

"aerosol processes are more dynamic than previously estimated, with important implications for...aerosol-driven climate effects and marine biogeochemical processes globally."

In memory of David Kadko.

rdcu.be/eHihM
Constraining aerosol deposition over the global ocean
Nature Geoscience - Aerosol deposition onto the surface of the ocean has been underestimated, suggesting that aerosol lifetimes over the ocean are longer than previously appreciated, according to a...
rdcu.be
Reposted by Dr Tommy Ryan-Keogh
hildeoliver.bsky.social
🌊 I have a new paper out in L&O Letters! We show that ocean color-based estimates of chlorophyll concentrations within 100 km of the Antarctic coastline are severely underestimated when applying the standard NASA L2gen atmospheric processing. This is caused by adjacency effects from ice and snow.
Figure 1 from the paper, showing four subplots of maps of the west Antarctic shelf extending from the West Antarctic Peninsula to the Ross Sea. Figure caption: January 10-yr (2010–2019) mean (a) OBPG/L2gen Chl a (which shows low Chl near the coastline), (b) OBPG nFLH (which shows elevated nFLH near the coastline), (c) OC-CCI Chl a (which also shows high Chl near the coast, agreeing with the pattern in the nFLH), and (d) difference in Chl a products OC-CCI Chl a minus OBPG/L2gen Chl a, over the west Antarctic shelf (which shows a band of much higher Chl, ~5-10 ug/L, extending along the entire west Antarctic coastline).
tjryankeogh.bsky.social
I also spotted this on my walk today, so if I ever get homesick for South Africa I can treat myself
tjryankeogh.bsky.social
Excited to start my new position at the @noc.ac.uk today. Feels like coming home to where my academic career began
Reposted by Dr Tommy Ryan-Keogh
noc.ac.uk
Researchers from the NOC have begun ground-breaking Arctic fieldwork in the fjords around Greenland to understand glacial meltwater’s impact on the carbon cycle, supported by Augmentum. 🧊🔁🌊

Read more here ➡️https://noc.ac.uk/news/noc-partners-augmentum-support-arctic-mission
Reposted by Dr Tommy Ryan-Keogh
stephhenson.bsky.social
🌊 I’m hiring! Last few days to apply!! Research Scientist in Marine Ecology & Machine Learning at the National Oceanography Centre, Southampton (UK). Got experience with machine learning techniques applied to marine ecology, biogeochemistry or climate change? careers.noc.ac.uk/vacancy/rese...
careers.noc.ac.uk
Reposted by Dr Tommy Ryan-Keogh
obialik.bsky.social
Phytoplankton are microscopic plants living in the water column. They flourish around Antarctica, where they both remove carbon from the atmosphere and are the base of the food web. Over the last 25 years, they have changed, and it's related to ice lose. 🧪🌊
Link: www.nature.com/articles/s41...
Chlorophyll data are from the European Space Agency ocean-colour climate change initiative project (OC-CCI) product. a, Map showing decadal chl-a trends (Sen slope; Methods) during summer. b, Monthly-mean chl-a anomalies during summer. c, Annual-mean chl-a anomalies. The red lines in b and c represent the trends calculated using the locally estimated scatterplot smoothing (LOESS) approach.
tjryankeogh.bsky.social
Today I had my farewell drinks at SOCCO. My 2 year postdoc position that turned into a beautiful 10 year adventure.
From September I will be starting my new position @noc.ac.uk as a Senior Researcher in the Ocean BioGeoSciences group.
tjryankeogh.bsky.social
🌊PhD Positions Available🌊

If you are interested in studying marine CDR check out the link below. There are 3 positions available at Stellenbosch University in the School of Climate Science. The applications will remain open until all positions are filled.

climate.sun.ac.za/blog/three-p...
Three PhD bursaries in marine Carbon Dioxide Removal (mCDR) - School for Climate Studies
The School for Climate Studies at Stellenbosch University (www.climate.sun.ac.za ) in collaboration with the Southern Ocean Carbon Climate Observatory (SOCCO) at CSIR, DFFE: Oceans and Coasts Branch, ...
climate.sun.ac.za
tjryankeogh.bsky.social
En route to the final SWINGS/GEOTRACES GS02 post cruise meeting. Prepared for a week of sharing ideas and drafting papers.
tjryankeogh.bsky.social
En route to the final SWINGS/GEOTRACES GS02 post cruise meeting. Prepared for a week of sharing ideas and drafting papers.
tjryankeogh.bsky.social
🌊 Registration now open for the GEOTRACES summer school.

📅 17-21 November | Cape Town

🎓Training in marine biogeochemistry of trace elements and isotopes for 36 students

Applications close 30 June 2025

geotraces-2025.sciencesconf.org
tjryankeogh.bsky.social
10 years ago today I landed in Cape Town for a 2 year postdoc position. Countless memories, 3 job promotions and 1 husband later I would say accepting this position was one of the best decisions I’ve ever made.
tjryankeogh.bsky.social
🌊
westafricanmargin.bsky.social
📣 Project Launch: Oxygen and biogeochemical dynamics along the west African margin (WAM): Processes and consequences 🌍

An interdisciplinary research project on ocean deoxygenation, funded by @schmidtsciences.bsky.social within the Ocean Biogeochemistry Virtual Institute (OBVI).
tjryankeogh.bsky.social
🌊
Today I presented at #icshmo2025 on some recent work I have been doing with @altagliabue.bsky.social and others. Where we performed a systematic assessment of NPP trends in models and observations, whilst also highlighting critical knowledge gaps that represent future research priorities.
tjryankeogh.bsky.social
As autumn creeps in another chilli harvest has come to an end. Proud of my green thumb this year in getting ghost chillies to grow.
tjryankeogh.bsky.social
Spent the long weekend camping in the mountains and disconnecting from the world.