Maurício Santos-Andrade

I’m looking for a PhD student to join my lab @ NC State starting Fall 2026!

Lots of room to develop projects, esp. around paleoceanography, ocean deoxygenation & foraminiferal ecology. Field, lab & computational angles all possible.

Please share with anyone who might be a good fit!

Unexpected decline in the ocean carbon sink under record-high sea surface temperatures in 2023 - Nature Climate Change The ocean carbon sink strengthened in previous warm El Niño years due to reduced CO2 outgassing in the tropics. Here the authors show that the ocean carbon sink declined in 2023 despite record-high sea surface temperatures (SSTs), primarily due to SST-driven outgassing of CO2 in the subtropics.

A study in Nature Climate Change shows that the ocean carbon sink unexpectedly declined in 2023 despite record-high sea surface temperatures (SSTs), primarily due to SST-driven outgassing of CO2 in the subtropics. 🌊 🧪

Time series of standardized streamflow anomaly for the Ganga River from year 700 to 2020 (derived from a hydrological model and from the Monsoon Asia Drought Atlas built from tree rings). The plot shows mostly balanced wet (blue/green bars) and dry (brown bars) years until the 20th century, when the black moving-average line dips sharply after 1990. The 1991–2020 mean (blue horizontal line) is well below the range of previous 1,300 years. Orange dots mark major documented historical droughts, but the recent drying is clearly the most severe.

Observed changes in precipitation and temperature between 1951 and 2020. Spatial distribution of change in (A) annual precipitation (%) and (B) annual mean temperature (°C) between 1951 and 2020 based on the Sen’s slope calculation. Grids with statistically significant trends (P <= 0.05), based on the Mann–Kendall test, are highlighted with stippling. The Inset panels in (A) and (B) represent the interannual variability in precipitation anomaly (%) and temperature (°C) averaged for the Ganga River Basin (blue boundary). The total change in average precipitation and temperature over the GRB during 1951−2020, estimated using the Sen’s slope, is statistically significant (P-value <= 0.05) based on the Mann–Kendall test.

🚨New work🚨 led by Ph.D. student Dipesh Chuphal (IIT Gandhinagar), shows that the recent drying of the Ganga River basin is unprecedented in 1,300 years—more severe than historical famines. This ~multidecadal drying appears forced, but many models do not capture it. ☔️ 🌧️

www.pnas.org/doi/10.1073/...

Carbonate chemistry fitness landscapes inform diatom resilience to future perturbations Diatom growth rates are determined by concentrations of CO2 and H+ across broad carbonate chemistry landscapes.

1/n
This study led by @aaronferderer.bsky.social tested how 5 diatom species respond to broad ranges of seawater carbonate conditions. Goal was to determine carbonate chemistry niches and to inform Ocean Alkalinity Enhancement (OAE) and Ocean Acidification (OA)

🌊

www.science.org/doi/10.1126/...

Southern Ocean CO2 outgassing and nutrient load reduced by a well-ventilated glacial North Pacific - Nature Communications A better-ventilated North Pacific could have reduced the carbon of water upwelled in the Southern Ocean, reducing outgassing and revealing a remote influence on Southern Ocean biogeochemistry in glaci...

Shankle et al. show how a better- #Ventilated #NorthPacific could have reduced the #ocean-carbon upwelled in the #SouthernOcean, reducing outgassing and revealing a remote influence on #SouthernOcean biogeochemistry in #GlacialTimes. #ice-ages @earthscista.bsky.social
www.nature.com/articles/s41...

Southern Ocean CO2 outgassing and nutrient load reduced by a well-ventilated glacial North Pacific - Nature Communications A better-ventilated North Pacific could have reduced the carbon of water upwelled in the Southern Ocean, reducing outgassing and revealing a remote influence on Southern Ocean biogeochemistry in glaci...

🚨New paper on Southern Ocean CO2🚨
Using a suite of Earth system models, Maddie Shankle et al show that better ventilation of intermediate waters in the North Pacific ends up reducing outgassing of CO2 in the Southern Ocean 🌊🧪⚒️🧵 @earthscista.bsky.social
www.nature.com/articles/s41...

🌟New GEOTRACES Science Highlight!🌟

Dissolved nickel sources: transformation and sinks in the Arabian Sea 🌊
www.geotraces.org/dissolved-ni...

Paper first author: Nirmalya Malla, CSIR-NIO

#MarineScience #OceanScience #geochemistry
#biogeochemistry @scor-int.bsky.social

New Mesocosm Study in Gran Canaria 8. September 2025 / Gran Canaria / Kiel. Over the coming weeks, international researchers led by the GEOMAR Helmholtz Centre for Ocean Research Kiel will conduct an experiment in closed marine tanks o...

Our next #mesocosm study has started. Over the coming weeks, international researchers led by GEOMAR will conduct an experiment in closed marine tanks on the coast of Gran Canaria to investigate the effect of various methods of ocean alkalisation on the marine ecosystem
www.geomar.de/en/news/arti...

New GEOTRACES Science Highlight! 🌊

Linking cadmium cycling to phosphate dynamics in the Indian Ocean: Evidence from GEOTRACES transects
www.geotraces.org/linking-cadm...

Paper first author: Tapas Kumar Mishra, CSIR-NIO

@scor-int.bsky.social @unoceandecade.bsky.social
#OceanScience #geochemistry

Almost no clouds to watch this masterpiece in the sky for a total lunar eclipse last night.

“death by a thousand cuts”

Planktonic foraminifera regulate calcification according to ocean density - Communications Earth & Environment Planktonic foraminifera increase shell weight with habitat depth, allowing living cells to adjust their buoyancy by increasing their density as water density increases, according to analyses of their ...

🌊 Tiny ocean drifters, planktonic foraminifera, adjust shell weight to stay buoyant.

A study with ICTA-UAB’s Graham Mortyn shows this density-matching trick could alter the carbon cycle as oceans warm.

www.nature.com/articles/s43....

#ICP16 will be hosted by St Andrews, Scotland @mudwaterclimate.bsky.social thank you.
We had two pitches from Cardiff and St Andrews. 🙏🏼

Just a reminder from a few weeks ago.

🌊📊 #SOOS_DATAMonday | #SOOSmap_Month Spotlight!
Today we’re diving into two powerful datasets available through #SOOSmap from @noaa.gov !

🟦 SOCAT v2024 – The Surface Ocean CO₂ Atlas
➡️ Provides high-quality surface ocean carbon dioxide (CO₂) analysis
🔗https://buff.ly/Gl5Xf4z

Introducing the "tree ring plot": a new way to visualize global surface temperatures. Each ring is a year, and each colored cell represents a day in global average temperatures (compared to a 1850-1900 preindustrial baseline).

Bootstrap analysis for the origination rates and extinction rates of calcareous (dotted lines) and agglutinated (dashed lines) foraminifera. (A) Expected (light orange shading) versus actual (dark orange dotted line) calcareous extinction rates, (B) expected (light blue shading) versus actual (dark blue dotted line) calcareous origination rates, (C) expected (light orange shading) versus actual (dark orange dashed line) agglutinated extinction rates and (D) expected (light blue shading) versus actual (dark blue dashed line) agglutinated origination rates. Vertical dashed lines indicate the Big Five mass extinction events; the Phanerozoic time scale is at the bottom of the figure; transitions between calcite and aragonite seas are indicated at the top of the figure and the black gradient bar (middle) represents the approximate duration of the Mesozoic Marine Revolution (MMR). p̂ = origination rate; q̂ = extinction rate.

#WeekendReading: Faulkner et al. (w/
@rowanmartindale.bsky.social;
@chrislowery.bsky.social) on how the test walls of foraminifera change through the Phanerozoic and what might that have to do with ocean chemistry. 🧪⚒️🌊
royalsocietypublishing.org/doi/10.1098/...

Map Antarctica without ice

Antarctica without ice🧊🧊🧊🧊

#AWI scientists have developed a new map of #Antarctica in collaboration with @bas.ac.uk. 🇦🇶

It shows the landscape beneath the Antarctic ice sheet more precisely than ever before: the topography of the mountains, canyons and depressions.

Climate-driven shifts in Southern Ocean primary producers and biogeochemistry in CMIP6 models Abstract. As a net source of nutrients fuelling global primary production, changes in Southern Ocean productivity are expected to influence biological carbon storage across the global ocean. Following...

Climate change is reshaping the Southern Ocean’s ecosystems, with 𝗽𝗿𝗶𝗺𝗮𝗿𝘆 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝘃𝗶𝘁𝘆 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝗲𝗱 𝘁𝗼 𝗶𝗻𝗰𝗿𝗲𝗮𝘀𝗲 𝗯𝘆 𝟯𝟬% in some areas! 📈 Yet, big data gaps persist.
bg.copernicus.org/articles/22/...

@edinburgh-uni.bsky.social @bas.ac.uk @scotsages.bsky.social

Does making seashells 🐚 in the ocean to drawdown atmospheric CO₂ sound like a good climate solution to you?

Then you’re the target audience of this blog from @mtyka.bsky.social explaining how precipitation of calcium carbonate to make shells uses bicarbonate and actually releases CO₂. 🌊

DB is an adventure! Good luck because you will need it (102% sure) 🫠