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Dr Tommy Ryan-Keogh

@tjryankeogh

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

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16.11.2024
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Latest posts by Dr Tommy Ryan-Keogh @tjryankeogh

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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...

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 🌊

15.12.2025 11:11 πŸ‘ 7 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
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The 2025 GEOTRACES Summer School was a success! 🌊

A sincere thank-you to all organisers, lecturers & participants!

πŸ“… 17–21 Nov 2025 | πŸ“ Cape Town, SA
geotraces-2025.sciencesconf.org

Sponsors @cnrs.fr @scor-int.bsky.social
@campusfrance.bsky.social @FranceInSouthAfrica
#EarlyCareers
πŸ“½οΈ S. Fietz

27.11.2025 13:57 πŸ‘ 5 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
Careers | National Oceanography Centre

🌊 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...

24.11.2025 08:42 πŸ‘ 8 πŸ” 5 πŸ’¬ 0 πŸ“Œ 0
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🌊 The GEOTRACES Summer School has started!

πŸ“… 17–21 Nov 2025 - Cape Town, South Africa
πŸ”— 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

17.11.2025 10:51 πŸ‘ 5 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
Our Vision For The Next Decade
Our Vision For The Next Decade YouTube video by National Oceanography Centre

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 πŸŒͺ️ Hazards & Pollution 🌊 Sustainable Marine Economy 🧊 Arctic changes.

Watch through our eyes here: 🎬 youtu.be/v6MSq2Qi2Sk

04.11.2025 15:30 πŸ‘ 15 πŸ” 4 πŸ’¬ 1 πŸ“Œ 2
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🌊 Postdoc Opportunity: Ocean Biogeochemical Modelling

Alessandro Tagliabue at the University of Liverpool is hiring a 3-year Postdoctoral Research Associate @altagliabue.bsky.social

πŸ”—Details & apply www.jobs.ac.uk/job/DPG117/p...

#Postdoc #Oceanography #Biogeochemistry #AcademicJobs #ScienceJobs

03.11.2025 14:38 πŸ‘ 6 πŸ” 9 πŸ’¬ 1 πŸ“Œ 0
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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...

Western Indian subantarctic phytoplankton blooms fertilized by iron-enriched Agulhas water 🌊

rdcu.be/eMTV2?utm_ca...

02.11.2025 11:51 πŸ‘ 21 πŸ” 9 πŸ’¬ 0 πŸ“Œ 0
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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!

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...

29.10.2025 17:38 πŸ‘ 42 πŸ” 50 πŸ’¬ 0 πŸ“Œ 2
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🚨 Register now! Launch of GEOTRACES Intermediate Data Product 2025! 🌊

πŸŽ₯ Join our release webinars:
20 Nov 13:15 UTC | 25 Nov 05:00 UTC
πŸ“ Register: forms.gle/H4bMQ6PgjtQR...

Discover a rich collection of hydrographic and marine geochemical data!

@scor-int.bsky.social
@unoceandecade.bsky.social

21.10.2025 12:16 πŸ‘ 5 πŸ” 6 πŸ’¬ 0 πŸ“Œ 1

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 πŸ§ͺπŸŒŠβš’οΈ

23.09.2025 02:10 πŸ‘ 63 πŸ” 23 πŸ’¬ 0 πŸ“Œ 1
Bathymetric map of the Northern Gulf of Alaska Long Term Ecological Research (NGA LTER) site

Bathymetric map of the Northern Gulf of Alaska Long Term Ecological Research (NGA LTER) site

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/...

20.09.2025 06:31 πŸ‘ 10 πŸ” 3 πŸ’¬ 1 πŸ“Œ 0
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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...

🌊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

19.09.2025 20:48 πŸ‘ 5 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
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).

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).

🌊 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.

06.09.2025 23:40 πŸ‘ 27 πŸ” 4 πŸ’¬ 1 πŸ“Œ 0
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I also spotted this on my walk today, so if I ever get homesick for South Africa I can treat myself

01.09.2025 07:41 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Excited to start my new position at the @noc.ac.uk today. Feels like coming home to where my academic career began

01.09.2025 07:40 πŸ‘ 6 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0
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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. πŸ§ŠπŸ”πŸŒŠ

Read more here ➑️https://noc.ac.uk/news/noc-partners-augmentum-support-arctic-mission

27.08.2025 12:55 πŸ‘ 13 πŸ” 2 πŸ’¬ 1 πŸ“Œ 1

🌊 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...

27.08.2025 08:02 πŸ‘ 7 πŸ” 12 πŸ’¬ 0 πŸ“Œ 0
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.

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.

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. πŸ§ͺ🌊
Link: www.nature.com/articles/s41...

28.07.2025 07:08 πŸ‘ 26 πŸ” 12 πŸ’¬ 0 πŸ“Œ 1
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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.

23.07.2025 18:13 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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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...

The circumpolar Southern Ocean circulation seems to have tipped and is in transition to a new state. Not good. 🌊πŸ§ͺ

05.07.2025 06:25 πŸ‘ 24 πŸ” 11 πŸ’¬ 0 πŸ“Œ 0
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, ...

🌊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...

23.06.2025 14:57 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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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...

🌊 blogs.egu.eu/divisions/os...

10.06.2025 10:33 πŸ‘ 6 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

En route to the final SWINGS/GEOTRACES GS02 post cruise meeting. Prepared for a week of sharing ideas and drafting papers.

08.06.2025 14:34 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

En route to the final SWINGS/GEOTRACES GS02 post cruise meeting. Prepared for a week of sharing ideas and drafting papers.

08.06.2025 14:33 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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🌊 Registration now open for the GEOTRACES summer school.

πŸ“… 17-21 November | Cape Town

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

Applications close 30 June 2025

geotraces-2025.sciencesconf.org

27.05.2025 15:12 πŸ‘ 9 πŸ” 5 πŸ’¬ 0 πŸ“Œ 0
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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...

🌊 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/...

12.05.2025 10:36 πŸ‘ 7 πŸ” 2 πŸ’¬ 0 πŸ“Œ 1

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.

06.05.2025 05:36 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Marion Island β€˜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...

🌊 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...

17.04.2025 13:25 πŸ‘ 2 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
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

🌊 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.

14.04.2025 13:27 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

🌊

14.04.2025 13:08 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0