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Dr Tommy Ryan-Keogh

@tjryankeogh.bsky.social
408 followers 178 following 32 posts

Ocean biogeochemist based at the Southern Ocean Carbon-Climate Observatory, South Africa

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Reposted by Dr Tommy Ryan-Keogh
Southern Ocean Observing System (SOOS) @soosocean.bsky.social · 28/09/2026
🌊 State of the Southern Ocean in 2025 SandyThomalla and other SOOS members contributed to this year's @ametsoc State of the Climate: buff.ly/yp2oEDD 🌡️ Widespread warming 🔥 Record-high upper-ocean heat content 🌊 Enhanced ocean heat uptake 🌱 Elevated summer chlorophyll 🫧 Surface O2 anomalies
buff.ly
State of the Climate 2025: Antarctica and the Southern Ocean
Special Online Supplement to the Bulletin of the American Meteorological Society Vol. 107, No. 8, August, 2026
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Reposted by Dr Tommy Ryan-Keogh
GEOTRACES @geotraces.bsky.social · 11/09/2026
New job opportunity posted on the GEOTRACES site! 🌊 Post-Doctoral Research Fellow or Researcher, University of Plymouth, UK www.jobs.ac.uk/job/DSU877/p... #sciencejobs #Postdoc #geochemistry @scor-int.bsky.social
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 15/12/2025
The first paper for the IronMan project led by @altagliabue.bsky.social has been published in @globalchangebio.bsky.social onlinelibrary.wiley.com/doi/10.1111/... This January we set sail on the @bas.ac.uk research vessel the Sir David Attenborough to collect a whole suite of new observations 🌊
onlinelibrary.wiley.com
The Evolution of Southern Ocean Net Primary Production in a Changing Climate: Challenges and Opportunities
Net primary production in the Southern Ocean plays a critical role in governing ecosystem production, the biological carbon pump, and global biogeochemical cycles. Recent work has advanced our unders...
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Reposted by Dr Tommy Ryan-Keogh
GEOTRACES @geotraces.bsky.social · 27/11/2025
The 2025 GEOTRACES Summer School was a success! 🌊 A sincere thank-you to all organisers, lecturers & participants! 📅 17–21 Nov 2025 | 📍 Cape Town, SA geotraces-2025.sciencesconf.org Sponsors @cnrs.fr @scor-int.bsky.social @campusfrance.bsky.social @FranceInSouthAfrica #EarlyCareers 📽️ S. Fietz
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Reposted by Dr Tommy Ryan-Keogh
Steph Henson @stephhenson.bsky.social · 24/11/2025
🌊 We’re hiring! Permanent position for an assistant research scientist in marine autonomous systems at NOC Southampton. Do you enjoy developing python tools and data workflows? And have an interest in marine science? Apply before 10 December! careers.noc.ac.uk/vacancy/assi...
careers.noc.ac.uk
Careers | National Oceanography Centre
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Reposted by Dr Tommy Ryan-Keogh
GEOTRACES @geotraces.bsky.social · 17/11/2025
🌊 The GEOTRACES Summer School has started! 📅 17–21 Nov 2025 - Cape Town, South Africa 🔗 geotraces-2025.sciencesconf.org Training 36 students in marine biogeochemistry of trace elements & isotopes Thanks @cnrs.fr @scor-int.bsky.social #EarlyCareers #summerschool #marinescience #oceanscience
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Reposted by Dr Tommy Ryan-Keogh
National Oceanography Centre @noc.ac.uk · 04/11/2025
We’re proud to launch our new 10-year strategy: by deepening our knowledge of the ocean, we help every living thing on our planet flourish. Our focus: 🌎 Climate 🐟Biodiversity 🌪️ Hazards & Pollution 🌊 Sustainable Marine Economy 🧊 Arctic changes. Watch through our eyes here: 🎬 youtu.be/v6MSq2Qi2Sk
youtu.be
Our Vision For The Next Decade
YouTube video by National Oceanography Centre
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Reposted by Dr Tommy Ryan-Keogh
GEOTRACES @geotraces.bsky.social · 03/11/2025
🌊 Postdoc Opportunity: Ocean Biogeochemical Modelling Alessandro Tagliabue at the University of Liverpool is hiring a 3-year Postdoctoral Research Associate @altagliabue.bsky.social 🔗Details & apply www.jobs.ac.uk/job/DPG117/p... #Postdoc #Oceanography #Biogeochemistry #AcademicJobs #ScienceJobs
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Reposted by Dr Tommy Ryan-Keogh
Prof Alessandro Tagliabue @altagliabue.bsky.social · 02/11/2025
Western Indian subantarctic phytoplankton blooms fertilized by iron-enriched Agulhas water 🌊 rdcu.be/eMTV2?utm_ca...
rdcu.be
Western Indian subantarctic phytoplankton blooms fertilized by iron-enriched Agulhas water
Nature Geoscience - Recurrent phytoplankton blooms in the western Indian Subantarctic Zone are largely supported by iron-rich water transported into the region by the Agulhas Current, according to...
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Reposted by Dr Tommy Ryan-Keogh
Prof Alessandro Tagliabue @altagliabue.bsky.social · 29/10/2025
Seeking a three year postdoc in the field of ocean biogeochemistry and productivity using mechanistic models and synthesis of observations. Note the short fuse for applications. Please help distribute. All nationalities welcome to apply! 🌊 www.jobs.ac.uk/job/DPG117/p...
jobs.ac.uk
Postdoctoral Research Associate at University of Liverpool
Looking for a new job opportunity in academia? Check out this job opening for a Postdoctoral Research Associate on jobs.ac.uk!
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Reposted by Dr Tommy Ryan-Keogh
GEOTRACES @geotraces.bsky.social · 21/10/2025
🚨 Register now! Launch of GEOTRACES Intermediate Data Product 2025! 🌊 🎥 Join our release webinars: 20 Nov 13:15 UTC | 25 Nov 05:00 UTC 📝 Register: forms.gle/H4bMQ6PgjtQR... Discover a rich collection of hydrographic and marine geochemical data! @scor-int.bsky.social @unoceandecade.bsky.social
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Reposted by Dr Tommy Ryan-Keogh
Zack Labe @zacklabe.com · 23/09/2025
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 🧪🌊⚒️
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Reposted by Dr Tommy Ryan-Keogh
JGR: Oceans @jgroceans.bsky.social · 20/09/2025
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
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Reposted by Dr Tommy Ryan-Keogh
Cliff Buck @tracemetalclean.bsky.social · 19/09/2025
🌊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
rdcu.be
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...
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Reposted by Dr Tommy Ryan-Keogh
Hilde Oliver @hildeoliver.bsky.social · 07/09/2025
🌊 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).
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 01/09/2025
Excited to start my new position at the @noc.ac.uk today. Feels like coming home to where my academic career began
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Reposted by Dr Tommy Ryan-Keogh
National Oceanography Centre @noc.ac.uk · 27/08/2025
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
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Reposted by Dr Tommy Ryan-Keogh
Steph Henson @stephhenson.bsky.social · 27/08/2025
🌊 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
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Reposted by Dr Tommy Ryan-Keogh
Dr. Or M. Bialik |📚|🔬|🌊|⚒️ @obialik.bsky.social · 28/07/2025
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.
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 23/07/2025
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.
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Reposted by Dr Tommy Ryan-Keogh
Carlos Rocha 🇪🇺🇵🇹🇨🇮🇺🇦 @onebreathdoc.bsky.social · 05/07/2025
The circumpolar Southern Ocean circulation seems to have tipped and is in transition to a new state. Not good. 🌊🧪
pnas.org
Rising surface salinity and declining sea ice: A new Southern Ocean state revealed by satellites | PNAS
For decades, the surface of the polar Southern Ocean (south of 50°S) has been freshening—an expected response to a warming climate. This freshening...
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 23/06/2025
🌊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...
climate.sun.ac.za
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, ...
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 10/06/2025
🌊 blogs.egu.eu/divisions/os...
blogs.egu.eu
Monitoring the Ocean’s Green Pulse: A New Global Dataset for Phytoplankton Phenology
Phytoplankton are tiny, single-celled organisms mainly found in the ocean’s sunlit surface, where they grow through photosynthesis, forming the marine food web’s base and regulating Earth’s climate by...
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 08/06/2025
En route to the final SWINGS/GEOTRACES GS02 post cruise meeting. Prepared for a week of sharing ideas and drafting papers.
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 08/06/2025
En route to the final SWINGS/GEOTRACES GS02 post cruise meeting. Prepared for a week of sharing ideas and drafting papers.
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 27/05/2025
🌊 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
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 12/05/2025
🌊 New paper led by @sarahnicholson.bsky.social, myself and others. We generated a multi-year, multi-algorithm data product of global phytoplankton bloom phenology. The data is provided at 3 different spatial resolutions depending upon your study requirements. essd.copernicus.org/articles/17/...
essd.copernicus.org
Satellite-derived global-ocean phytoplankton phenology indices
Abstract. Phytoplankton bloom phenology is an important indicator for the monitoring and management of marine resources and the assessment of climate change impacts on ocean ecosystems. Despite its re...
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 06/05/2025
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.
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 17/04/2025
🌊 interesting article on the status of polar research in South Africa. Here’s hoping something will finally be done to fix the many issues. www.dailymaverick.co.za/article/2025...
dailymaverick.co.za
Marion Island ‘power crisis’: Generator clings to life as relief ship takes its time
Just one life-saving machine is still limping along at the isolated outpost. Back-up systems have thrown in the towel. As help from the South African mainland has been delayed again, all base staff ca...
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 14/04/2025
🌊 SOCCO’s brand new website is finally live. socco.org.za Check it out to find out more details about the team and the research projects we are involved in.
socco.org.za
SOCCO | Southern Ocean Carbon & Climate ObservatorySOCCO | Southern Ocean Carbon & Climate Observatory | SOCCO
SOCCO is a South African integrated science and innovation programme in support of the Department of Science and Innovation’s (DSI) Decadal and Strategic Plans
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 14/04/2025
🌊
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 03/04/2025
🌊 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.
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 31/03/2025
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.
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 24/03/2025
Spent the long weekend camping in the mountains and disconnecting from the world.
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 19/02/2025
🌊 mg.co.za/the-green-gu...
mg.co.za
Climate models underestimate global phytoplankton decline, study warns
A CSIR study analysing 26 years of satellite data reveals how ocean warming is significantly reducing ocean productivity
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 13/02/2025
My fan club watching me on the news last night as I spoke about my recent study in @commsearth.bsky.social 🌊
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Reposted by Dr Tommy Ryan-Keogh
Santiago Gassó @sangasso.bsky.social · 31/01/2025
🧪🌊 hey #biogeochemistry , #marinegeochemistry students and early careers out there, you may want to sign up in this list. www.geotraces.org/geotraces-ea... #ECR @tracemetalclean.bsky.social @altagliabue.bsky.social @usocb.bsky.social @soosocean.bsky.social
geotraces.org
GEOTRACES Early Career Scientist Committee – GEOTRACES
An International Study of the Marine Biogeochemical Cycles of Trace Elements and Isotopes - Trace Element data available including an on-line Atlas eGEOTRACES
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 01/02/2025
Global declines in ocean primary production underestimated by climate models communities.springernature.com/posts/global... 🌊
communities.springernature.com
Global declines in ocean primary production underestimated by climate models
The following study developed a model ranking system to reduce the uncertainties associated with future projections of ocean productivity. Declines are much more likely than presently predicted, but e...
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 01/02/2025
Very pleased that my latest paper with @altagliabue.bsky.social and Sandy Thomalla in @commsearth.bsky.social is published. You can check it out here: bit.ly/3EjYYvG
bit.ly
Global decline in net primary production underestimated by climate models - Communications Earth & Environment
Earth system models underestimate the decline in net primary productivity associated with ocean warming, meaning future net primary productivity decline is more likely than currently estimated, accord...
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 25/12/2024
First ever Christmas just me and my fiancé alone! And what a lovely Christmas it is turning out to be 🎄
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Reposted by Dr Tommy Ryan-Keogh
Nature Portfolio @natureportfolio.nature.com · 19/12/2024
A paper in Nature reports that recent record lows in Antarctic sea-ice extent have led to increases in the frequency of storms over the newly ice-free ocean. go.nature.com/41I6PwC 🧪
 
This is figure 5, which shows the frequency of storms within the Antarctic sea-ice region shows the increase in winter 2023 storminess relative to 1990–2015.
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 02/12/2024
An awesome day was had celebrating our end of year function at Silvermine dam. We had a very successful year at SOCCO, and now it’s time for a nice break.
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 21/11/2024
Today we are saying goodbye to Antoine Ringarde who has been visiting me from France for the past 2 months. A very productive visit where we got to properly interrogate trace metal cycling and phytoplankton quota data generated from the SWINGS cruise
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Dr Tommy Ryan-Keogh @tjryankeogh.bsky.social · 16/11/2024
It was time to migrate over from the bad place
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