We are launching a new GEOTRACES Online Seminar Series next week—please join us!

🌊 GEOTRACES is launching an Online Seminar Series!

📅 Last Tuesday each month
🎤 Senior + #earlycareer talks
🖥️ Zoom

First seminars:
• Apr 28 – Data synthesis, modelling & integration
• May 26 – Trace metals in polar regions
• Jun 30 – Atmospheric aerosol deposition

@scor-int.bsky.social

📢 SAVE the date! 🌊
April 28, 2026 | 15:00 CET
GEOTRACES Online Seminar Series — Launch Seminar
www.geotraces.org/online-semin...

Join us and spread the word!

#GEOTRACES #OceanScience #EarlyCareer
@scor-int.bsky.social

Haarlem, NL.

When they built an underground bike parking garage by the station they turned the old bike parking into a new public square. Then they removed motor traffic from the main road & made it a cycleway, with a bus-only road alongside.

Cities get nicer when you design for people, not cars.

US Congress set to reject Trump’s sweeping science budget cuts Lawmakers announce legislation that would actually increase funding for basic research by more than 2%.

US Congress set to reject Trump’s sweeping science budget cuts www.nature.com/articles/d41...

Very cool postdoc fellowship opportunities at UPenn. The deadline is fast approaching though.
viest.upenn.edu/sustainabili...

🌊 an opportunity to suggest endangered data, I would think

Depth (0 to 300 m) by time (2022 to 2026) plots of temperature, salinity, particulate organic carbon (POC), chlorophyll (CHL_A), oxygen, nitrate, pH at in situ temp/pressure, and computed dissolved inorganic carbon (DIC) for float 5906497 (adopted name Hedy Lamarr).

🌊BGC-Argo float of the month is 5906497 with 4 years under Antarctic sea ice, just popped out. It was adopted by the American School in Jeddah, Saudi Arabia and named “Hedy Lamarr” – the actress who co-invented and patented frequency hopping communications.  Named for her science contribution. 1/2

Elucidating the Role of Marine Benthic Carbon in a Changing World New observations should prioritize easier-to-collect variables to rapidly increase temporal and spatial coverage of benthic data Multi-variable data sets need to be harmonized to provide comprehe...

New commentary on marine benthic carbon modeling and data synthesis 🌊 @usocb.bsky.social
agupubs.onlinelibrary.wiley.com/doi/10.1029/...

(a) Annual Southern Ocean NPP (Pg C) time series for six remote sensing algorithms: Eppley-VGPM, Behrenfeld-VGPM, Behrenfeld-CbPM, Westberry-CbPM, Lee-AbPM, and Silsbe-CAFE. (b) Long-term NPP trends (Gg C year−1) averaged across the Southern Ocean for the full time series (darker shade) and a jackknife resampling of the full time series (1998–2024) as a moving 20-year record with the mean trends ± the standard deviation reported (lighter shade).

If you’re interested in the productivity of the southern ocean using remote sensing, floats and models - both now and in the future then this is the paper for you! We’re gearing up for an associated field campaign in January!! 🌊

doi.org/10.1111/gcb....

This figure illustrates the conceptual framework of spatiotemporal dynamics in marine ecological stoichiometry for C, N and P, highlighting how their ratios and distributions vary across spatial scales and over time.

#WeekendReading: Liu et al. on how the ratio between carbon, nitrogen, and phosphorus in the oceans has changed over the last fifty years. Redfield seems (as it has been for a while now) an assumption that has to be verified for each case study. 🧪🌊

Link: www.nature.com/articles/s41...

Localized nutrient colimitation of phytoplankton growth rates across the subtropical South Pacific Ocean | PNAS The simultaneous depletion of multiple nutrients in seawater potentially leads to colimitation of phytoplankton growth across large oceanic extents...

Localized nutrient colimitation of phytoplankton growth rates across the subtropical South Pacific Ocean www.pnas.org/doi/abs/10.1... #jcampubs 🌊

Before / After the school street Rue du Capitaine Lagache in the 17th arrondissement of Paris. In video with sound this time ;) For the anecdote, this video was not done with a before / after effect in mind, but by luck it turns out there was a Street view photo that could work with it !

Southern Ocean net primary production influenced by seismically modulated hydrothermal iron - Nature Geoscience Earthquakes influence the amount of hydrothermal iron entering the ocean over the Australian Antarctic Ridge, which can support phytoplankton blooms by relieving surface iron limitation, according to ...

⚒️ Article: Earthquakes influence the amount of hydrothermal iron entering the ocean over the Australian Antarctic Ridge, which can support phytoplankton blooms by relieving surface iron limitation

www.nature.com/articles/s41...

About to speak on a panel about careers in STEM at Princeton

Delighted that one of my Antarctic winter photos has won the 2025 Royal Society Photography Competition, Earth Science & Climatology category.

Captured during polar-night surveys of ocean conditions near Antarctic Peninsula glaciers.

royalsociety.org/journals/pub...

Accuracy of the Lotka-Volterra model fails in strongly coupled microbial consumer-resource systems Author summary Microbial communities interact by competing for shared nutrients and by cross-feeding on each other’s metabolic byproducts. A widely used approach to model these dynamics is the general...

Accuracy of the Lotka-Volterra model fails in strongly coupled microbial consumer-resource systems journals.plos.org/ploscompbiol... #jcampubs

The Legal Attack on Superblock Barcelona - City Lab Barcelona In this blog post, I attempt to unpack what this court ruling is about, the legal arguments, and who is behind it. Did the city really do something wrong?  What will happen to the Consell de Cent proj...

Heard this one? The City of Barcelona traded 3 lanes of vehicle traffic for an exceptional 4.7km green pedestrian corridor in the heart of the Eixample grid. Businesses sued, & eventually won in court. Then they admitted that they actually like the change.

Streets for people are good for business.

Exciting SWBio PhD opportunity to study cell signalling in marine diatoms during heat stress. Deadline 3rd December 2025 @swbiodtp.bsky.social @kehelliwell.bsky.social @thembauk.bsky.social @exetermarine.bsky.social

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

UCLA Professor Daniele Bianchi welcoming us to the 2025 So Al BOOM. Slide in the background shows the original “BOOMers”

Today is the fifth annual SoCal BOOM (biogeochemical ocean obs & models)—this time @ UCLA!

Here Daniele Bianchi opens the event with the standard greeting “Hello BOOMers!”

Assistant Professor in Paleoceanography - Marine Geosciences in Miami, Florida, United States of America | Faculty & Physicians at University of Miami Apply for Assistant Professor in Paleoceanography - Marine Geosciences job with University of Miami in Miami, Florida, United States of America. Faculty & Physicians at University of Miami

I hear that University of Miami is looking for a paleoceanography / paleoclimate scientist:

careers.miami.edu/us/en/job/R1...

Closing Central Madrid To Cars Resulted In 9.5% Boost To Retail Spending, Finds Bank Analysis City of Madrid significantly boosted the takings of its shops and restaurants last Christmas by banning cars from the CBD, finds an analysis by Spain's second largest bank.

Keep this in mind when people claim cars mean business — closing Central #Madrid to cars over holidays resulted in a 9.5% boost in retail spending on its main shopping street: STUDY.

There was also a 71% drop in air pollution.

Via @carltonreid.com in @forbes.com. #citymakingmath #citiesforpeople

Deep-sea viral diversity and their role in host metabolism of complex organic matter - Nature Communications Roles of viruses in deep-sea ecosystems are poorly understood. Here, the authors use metagenomics and metatranscriptomics to profile DNA and RNA viruses in deep-sea sediments showing that these viruse...

Deep-sea viral diversity and their role in host metabolism of complex organic matter www.nature.com/articles/s41... #jcampubs 🌊

New! GEOTRACES Data Product 2025-Now available! 🌊

Hydrographic and marine biogeochemical data from 123 cruises covering the global ocean

*Bulk download
bodc.ac.uk/geotraces/data/dp/
*Data subsetting
geotraces.webodv.awi.de
*Data analysis, visualisation
explore.webodv.awi.de
*Atlas
egeotraces.org

Conserved genetic markers reveal widespread diatom sexual reproduction in the global ocean - Nature Communications Diatoms dominate the oceans, yet sexual reproduction - key to bloom dynamics and species evolvability - is rarely observed. Using a lab-to-field approach, this study presents conserved markers applica...

Conserved genetic markers reveal widespread diatom sexual reproduction in the global ocean www.nature.com/articles/s41... #jcampubs 🌊

First page of Opinion piece: "Conceptual and methodological flaws undermine claims of a link between the gut microbiome and autism"

The link between the gut #microbiome and autism is not backed by science, researchers say.

Read the full opinion piece in @cp-neuron.bsky.social: spkl.io/63322AbxpA

@wiringthebrain.bsky.social, @statsepi.bsky.social, & @deevybee.bsky.social

Current Vacancies

I am hiring 4 postdoctoral researchers for up to 4 years each. Topics include ice sheet reconstruction, GIA, spatial stats, and satellite geodesy. Based in Tasmania.

All details are here: careers.utas.edu.au/en/listing/ with titles below

I am also recruiting multiple PhD students (see below)

1/n

Aerial view of Cocos Island, a small atoll surrounded by a vibrant turquoise lagoon and coral reef. The lush green island is encircled by the reef.

Our Earth scientists have discovered how continents are slowly peeled from beneath, fuelling volcanic activity in an unexpected place - the oceans 🌊

Discover more 👉 southampton.pulse.ly/xfz0mvyw2c

@sotonoceanearth.bsky.social

You’ve probably heard this claim: Climate’s always changing!

It's true, Earth’s climate has changed before. But not this fast, and not for this reason.

Introducing Cold Facts, Hot Takes: my new series of evidence-based replies to common troll takes 🔥

Want the whole episode? Links below ⬇️