Alex Cabral

Earth’s silicate weathering continuum - Nature Geoscience Chemical weathering of silicate rocks occurs along a continuum from terrestrial to marine environments.

Earth’s silicate weathering continuum www.nature.com/articles/s41... #jcampubs 🌊

Upcoming workshop (September) - Marine Benthic Calcifiers and Their Contribution to the Oceanic Carbon Cycle
Stay tuned — full program & registration coming early September!
maf-world.eu/events/save-...

Assistant Professor (Tenure Track) of Soil Chemistry

🇨🇭The #ETH in #Zürich is looking for an Assistant Professor in #Soil (Bio-/Geo-) Chemistry!

Deadline to apply is September 30th!

Please Share!

#AcademicSky #Biochemistry #biogeochemistry #soilscience

ethz.ch/en/the-eth-z...

Radium isotopes quantify vertical mixing and reveal large benthic silicate fluxes in anoxic deep waters Benthic fluxes are important sources of nutrients and dissolved carbon to the water column. Yet, most approaches for quantifying benthic fluxes are labor intensive and cover relatively small areas of...

Pleased to share our new publication in @aslo.org L&O!

We used #radium-224 to quantify vertical mixing and benthic silicate fluxes across the #Baltic Sea.

Read more here (fully open access): doi.org/10.1002/lno....

With (and others):
@barefootlab.bsky.social @biogeoste.bsky.social

Schematic illustration of the spatiotemporal variations of marine ecological stoichiometries of C, N and P

⚒️ Article: The proportion of carbon, nitrogen, and phosphorus in the ocean now substantially differs from the Redfield ratio, likely reflecting a reduction in phosphorus limitation

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

We are hiring!
The School of Natural Sciences in Trinity College Dublin is seeking to appoint a tenure-track Assistant Professor in Environmental Science.
Apply here: my.corehr.com/pls/trrecrui..., and under 'Department', scroll to The School of Natural Sciences. Deadline: August 15th.

🚨 PhD in marine biogeochemistry at ICBM (@icbm-uol.bsky.social) and MARUM (@marumunibremen.bsky.social) 🌊

Study DOM–metal interactions, and go on research cruises!
Project: www.marum.de/en/The-Ocean...
Apply: www.uni-bremen.de/universitaet...
#phd #DOM #deepsea

PhD scholarship available in modelling water quality NbS measures. info here earthandplanetary.wordpress.com/2025/06/19/p...

🚨 Happy to have contributed to the report:
" The State of the World's Salt marshes"
www.wwf.org.uk/our-reports/...

👉 Salt marshes have been lost to a crazy extend and this continue (0.28% per year).

👉~ 2 millions hectares could be restored

Wrapping up your PhD? I’m planning to hire a postdoc in the next few months (start date flexible). Will start formally advertising soon, but you heard it here first!! Possible research topics include - critical zone hydrology, agricultural water quality, SW-GW interactions. Reach out if interested!

🌊 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

Land Meets Sea: Towards the Development and Application of an Indicator to Assess Subsurface Nutrient Export Risk from Disconnected Coastal Catchments to the Sea - Estuaries and Coasts The land along the coast is often hydrologically disconnected from the prevailing river systems. Water flow and nutrient transport from these disconnected coastal subcatchments follow diffusive pathwa...

Delighted to share our paper on developing a catchment-level indicator for subsurface nutrient export risk. It focuses on how nutrients from areas not well connected via surface waters (eg, rivers) can reach the sea through subsurface pathways, framed in the context of the #BalticSea

New paper! led by Josh Dean “Old carbon routed from land to the atmosphere by global river systems”
doi.org/10.1038/s415...

#radiocarbon in #rivers reveals the age of CO2 they release to the atmosphere.

An active leak of old carbon from land.
🧪⚒️
@joshfdean.bsky.social @oxuniearthsci.bsky.social

No advert out yet, but I will recruiting a 2yr postdoc, start date autumn 2025, at @livunigeog.bsky.social soon. Lowland and upland peatlands, GHGs, DOM and water chemistry. Plenty of fieldwork. Feel free to drop me a DM or email if you might be interested, and please spread the word.

Environmental Gradients, Not Geographic Boundaries, Structure Meiofaunal Communities in Siberian Seas This study uses sediment eDNA metabarcoding to assess the diversity and distribution of meiofauna in Siberian seas, marking the first application of this technique in the region. Our results reveal t....

Paper out! 📣📣

Environmental Gradients, Not Geographic Boundaries, Structure Meiofaunal Communities in Siberian Seas 🌊🪱🪱

#Arctic #Biogeochemistry #Meiofauna #Sediment

📰 Full text: onlinelibrary.wiley.com/doi/10.1002/...

🤝@naturvetenskap.bsky.social @balticseacentre.bsky.social and others...

One week to get your applications in for our Blue Carbon Canada positions! Come join a collegial productive team with @taragmartin.bsky.social Sara Knox, Mary O’Connor, Graham Clark, me and our stellar set of PDFs and grad students! 🇨🇦 🌊 #dreamteam

🌊 Do you work with fjord sediments?

Then join us at #22ISC for the session: “Fjord sediments: Archives of climate and tectonics through time”

📍 Wellington, Aotearoa New Zealand
📅 25–30 January 2026
🌐 Session: tinyurl.com/fjordISC2026

@coastalcarbon.bsky.social @sedimentology.bsky.social

Oceans as climate change allies Can climate catastrophe be stymied by tweaking seawater chemistry?

Adding alkalinity to the ocean might enable it to take up more atmospheric CO₂, but much more research in laboratories, mesocosms, and field studies is needed before considering full-scale deployment. I have some thoughts in this piece. 🌊

@standrewssgsd.bsky.social has a new two week Blue Carbon Summer School happening between the 29th June and the 12th of July. Over the two weeks you will be introduced to field, lab and digital skills to undertake blue carbon research.

Full details -
tinyurl.com/yeyrbbm5

🧪 Nutrient pollution in Europe’s lagoons has triggered great nitrous oxide (N2O) emissions 🫧

🌎 Globally, emission from lagoons is higher than previously estimated 📈

Check is out in @jgrbiogeo.bsky.social
🔗: doi.org/10.1029/2024...

🤝 @biogeoste.bsky.social @barefootlab.bsky.social

A mangrove nitrous oxide sink attenuates methane climate impacts aslopubs.onlinelibrary.wiley.com/doi/10.1002/... #jcampubs

Nitrate‐Driven Eutrophication Supports High Nitrous Oxide Production and Emission in Coastal Lagoons Eutrophication stimulates nitrous oxide emissions in coastal lagoons Excess nitrate induces incomplete denitrification, leading to high nitrous oxide effluxes in sediments Nitrous oxide emission...

#Nitrogen paper out! 🌊🌊🌊

Global lagoons emit more N2O than we thought!

agupubs.onlinelibrary.wiley.com/doi/full/10....

The 2nd PhD paper by @hlscheung.bsky.social with a great team @barefootlab.bsky.social, etc. is out now in @jgrbiogeo.bsky.social @agu.org

🌿 Pristine mangroves absorb nitrous oxide (N2O), offsetting up to 71% of methane (CH4) emissions.

🌎 Global N2O uptake may compensate one-third of aquatic CH4 emissions.

aslopubs.onlinelibrary.wiley.com/doi/full/10....

@aslo.org @barefootlab.bsky.social @biogeoste.bsky.social

#ASLO_Letters

Postdoc (2 years) in aquatic ecosystem ecology

We are hiring a postdoc at Umeå University in aquatic ecosystem ecology. See the link for details!
www.umu.se/en/work-with...
@grocherros.bsky.social

Combined CH4, N2O, and CO2 Fluxes Reveal a Net Carbon Sink Across a Glacier‐Ocean Continuum A rapidly-retreating marine-terminating glacier exported CH4 to nearshore waters N2O was undersaturated near the glacier front The regional CO2 sink greatly outweighs CH4 and N2O emissions

My last PhD chapter is out!

Combined GHG fluxes reveal a net carbon sink across a glacier-ocean continuum — glacier exports CH₄ to coastal waters, but strong CO₂ uptake outweighs GHG emissions. 🌊❄️

Read more: agupubs.onlinelibrary.wiley.com/doi/full/10....

@barefootlab.bsky.social @agu.org @naturvetenskap.bsky.social @awahlin.bsky.social @hlscheung.bsky.social

Paper out @agu.org!

Overall, global fjords are minor sources of #N2O to the atmosphere

❗ BUT fjords with #aquaculture and #anoxia host relatively high nitrous oxide #emissions

👉 doi.org/10.1029/2024...

🤝Great collaboration with @barefootlab.bsky.social @awahlin.bsky.social

🌿Mangrove outwelling is a major carbon sequestration pathway, driving bicarbonate storage in the ocean. 🌊

Using radium isotopes, we resolved carbon outwelling from mangrove porewater to the continental shelf across seascapes in Brazil. 🌎

Open access: doi.org/10.1029/2024...

#AGUPubs @JGROceans

Groundwater releases CO2 to diverse global coastal ecosystems Groundwater is a hidden, steady source of CO2 to coastal waters.

Awesome outcome of Apra Tomer’s MSc work summarising >10 years of field investigations at 40 coastal systems from 14 countries.

Groundwater discharge explained much of the CO2 tidal dynamics in nearshore waters.

www.science.org/doi/full/10....

Groundwater releases CO2 to diverse global coastal ecosystems Groundwater is a hidden, steady source of CO2 to coastal waters.

Proud to be a part of the authorship team on this one!

Groundwater discharge contributes large amounts of carbon dioxide to coastal ecosystems and warrants inclusion in their carbon budgets.

www.science.org/doi/full/10....

Linnea Henriksson’s first paper just out in JGR-B.

Drivers of Seasonal and Diel #Methane Emissions From a #Seagrass Ecosystem

CO2-equivalent CH4 emissions counteracted 6% of the CO2 uptake, and ~1% of sediment carbon sequestration

agupubs.onlinelibrary.wiley.com/doi/full/10....