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Nadine Lehmann

@nadlehmann.bsky.social

546 followers 177 following 16 posts

Marine biogeochemist interested in carbon and nutrient cycling | Research fellow @ IMAS/UTAS | she/her

Posts Replies Media

Nadine Lehmann @nadlehmann.bsky.social · 24/03/2025

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

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Nadine Lehmann @nadlehmann.bsky.social · 20/02/2025

"scientists from the University of Tasmania’s Institute for Marine and Antarctic Studies took a closer look at how OAE could change ocean chemistry and how this could affect marine organisms in their surrounding environment" 🌊🧪 @utas.edu.au article: bit.ly/418Lqe7 Article: doi.org/10.1038/s415...

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Nadine Lehmann @nadlehmann.bsky.social · 12/02/2025

Based on observed relationships, we estimate that extreme alkalinity enhancement may promote the proliferation of coccolithophores, thereby reducing the CO2 removal potential of ocean alkalinity enhancement by 2-29% by 2100. 8/10

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Nadine Lehmann @nadlehmann.bsky.social · 12/02/2025

We found that surface gradients similar in magnitude to OAE-induced changes in carbonate chemistry support the proliferation of calcifying over non-calcifying phytoplankton. This positive correlation was observed across biogeochemically-distinct ocean provinces, bloom areas and marginal seas. 5/10

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Nadine Lehmann @nadlehmann.bsky.social · 12/02/2025

To test this, we used global satellite data to look at the balance in the abundance of calcifying phytoplankton relative to non-calcifying phytoplankton, and how this balance correlates with natural surface gradients of environmental drivers such as carbonate chemistry, nutrients, temperature. 4/10

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Nadine Lehmann @nadlehmann.bsky.social · 12/02/2025

Would marine calcifiers such as coccolithophores benefit from changes in carbonate chemistry under ocean alkalinity enhancement? @bachlennart.bsky.social and I tried to answer this question in a new natural analogue study out now in Nature Geoscience! @naturegeosci.bsky.social 🌊🧪 rdcu.be/d9zdH 1/10

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