Isaac Santos

Pinpointing Sewage Seeps in Hawaii - Eos Cesspools and septic systems, as well as coastal development, put Hawaiian coastal waters at risk of contamination.

Sewage in the ground, waste in the sea. A new study links outdated cesspools and septic systems in western Hawaii to water contamination, showing where cleanup should start. A model for islands worldwide.

Time series of a BGC‐Argo float WMO#5906483 deployed in the ETNP in January 2022 (see inset map reference). (a) Mean monthly POC stocks at the upper 100 m depth. (b) Chlorophyll fluorescence concentrations at the upper 200 m depth. Dashed black lines denote the ML. (c) POC concentrations overlain by the ML. (d) Nitrate concentrations. (e) Nitrite concentrations. (f) Thiosulfate concentrations. (g) Oxygen concentrations minus a background correction from the sensor calibration offset. Continuous black lines denote the isolines where corrected O2 = 1 μmol kg^-1

🌊BGC-Argo float of the month is a sensor, not a float. Bif and Johnson (GBC; doi/10.1029/2024GB008473) show that the concentration of nitrite can be extracted from the UV spectra of ISUS or SUNA nitrate sensors.

But more..

@globaloceanbgc.bsky.social floats. @mbarinews.bsky.social

Special Collection Call for Papers! Changing biogeochemical cycles along the land-to-ocean aquatic continuum. Open for submissions in: Earth's Future Geophysical Research Letters Global Biogeochemical Cycles JAMES JGR: Biogeosciences JGR: Oceans

📢Call for Papers!📢

A new #AGUPubs special collection welcomes articles that advance our understanding of human-perturbed nutrient and carbon cycles along the land-to-ocean continuum.

🔗 Learn how to submit: buff.ly/ilFnZVG

#AGUPubs #Biogeochemistry #Geochemistry #Nutrients #SDGs #IMOG2025

The Executive Order “Restoring Gold Standard Science” is Dangerous for America This EO is an unconstitutional attempt to censor and punish U.S. scientists for publishing science that doesn't fit a political agenda This misleading and false misrepresentation of U.S. scientif...

Editorial published today by the Editors-in-Chief of the @agu.org journals:
agupubs.onlinelibrary.wiley.com/doi/10.1029/...

The Executive Order “Restoring Gold Standard Science” is Dangerous for America This EO is an unconstitutional attempt to censor and punish U.S. scientists for publishing science that doesn't fit a political agenda This misleading and false misrepresentation of U.S. scientif...

"American science has no need to be "Restored" to a "Gold Standard:" American science has already set the "Gold Standard" for scientific research and publishing for over 80 years."

Read the full Editorial by the #AGUPubs Editors-in-Chief: doi.org/10.1029/2025...

#GoldStandardScience

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

GBC and other @agu.org journals will do what is possible to pick up the slack! Submit your best climate change science to society journals!

Online seminar by Bayani Cardenas today 15.30 Sweden time:
Land-ocean connectivity in Arctic lagoons due to groundwater

All welcome on zoom:
gu-se.zoom.us/j/6239355490...

The talk is part of his world tour sponsored by the GSA Hydrogeology Division:
community.geosociety.org/hydrodivisio...

Lots of cool barefoot lab presentations @EGU25 next week! Pop in and say hello!

🧪 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

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

Congrats @acabral.bsky.social on another awesome mangrove paper!

Large scale submarine groundwater discharge dominates nutrient inputs to China’s coast.

Total SGD accounted for 19–54% of nutrient inputs, exceeding inputs from atmospheric deposition and rivers.

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

New paper just published! We combined a water mass decomposition with biogeochemical tracers to untangle advective nutrient sources from the Gulf Stream and the Labrador Current versus local recycling along the Northwest Atlantic continental shelf. Have a look: 👇🌊🧪 #AGU

doi.org/10.1029/2024GB008409

Fundamental questions in meiofauna research highlight how small but ubiquitous animals can improve our understanding of Nature - Communications Biology This paper identifies the top-50 priority questions for meiofaunal research, highlighting their critical roles in biogeochemical cycles and biodiversity. It calls for a balanced research agenda, inter...

50 priority questions to guide research of global #meiofauna: standardized sampling and improved taxonomic methods are urgently needed to enhance #biodiversity assessments. Genomic approaches and international collaborations should be leveraged to overcome data bias. www.nature.com/articles/s42...

🚨We are hiring🚨ECR with a PhD within 7 years? Tenure track position (akin to Assistant Prof) in Earth and Env Data Science at U of Gothenburg, Sweden. Expertise in remote sensing and machine learning. Work on climate change, Earth systems, biodiversity, #EO, #UAV Deadline May 10 tinyurl.com/58ft38du

A nice letter by Yau et al., looking at CO2, CH4 and N2O fluxes across the glacier-ocean continuum in Iceland 🌊

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

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....

AGU stands with federal scientists. Read more on fromtheprow.agu.org/standing-tog...

@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

Our AEs typically manage 5–15 papers per year and join one meeting. You get to participate in shaping the quality and integrity of the scientific literature, the team is very supportive, and you gain insights into the scientific publishing process.

Reach out (gbc@agu.org) if you are interested with an one paragraph email. Essential criteria would be previous engagement with AGU journals as an author and reviewer. We want to expand expertise, diversify demographics, and build redundancy in our team.

Want to join @agu.org Global Biogeochemical Cycles editorial board? We are recruiting associate editors with expertise in microbiology (terrestrial and marine), silica and phosphorus cycling, soil respiration, lake CNP cycling, forest productivity, aquatic organic matter...

Influence of effluents from a Wastewater Treatment Plant on nutrient distribution in a coastal creek from southern Brazil The hypothesis that effluents treated through activated sludge process cause changes in nutrient...

Check an outcome of our undergrad aquatic pollution course back in Brazil written by students with a great mentor

www.scielo.br/j/babt/a/nyL...

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....

Only 3 more weeks to apply for the open postdoc position in my lab!

Project work focuses on greenhouse gas dynamics in seagrass meadows.

Read more about our research here: elgetti.wordpress.com

Link to apply and read about the project:
candidate.hr-manager.net/ApplicationI...

@ AGU 24

We are hosting two cool seminars today

3.15 pm Sweden time
Zoom: gu-se.zoom.us/j/65702490997

Eero Asmala, GTK Finland
Carbon burial in boreal lakes: linking sediment records to nutrient enrichment

Claire Treat, Aarhus University
Regional methane emissions from small to very large

All welcome!

[ContentItemCategory: Commentary] AND [PubType: Article] AND [Journal: Global Biogeochemical Cycles] : Search Journal of Geophysical Research

Many authors seem to hesitate to write these papers. We only publish one or two commentaries per year. Would be happy to see more!

agupubs.onlinelibrary.wiley.com/index/194492...