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Dr. Pearse J Buchanan Profile picture
Dr. Pearse J Buchanan
@PearseJBuchanan
Ocean biogeochemical modeller. Australian republican and Fulbright Fellow. 🌊🕺
Oct 28, 2021 • 9 tweets • 6 min read
Models project that #ocean #phytoplankton will become increasingly starved of #nitrogen as #climatechange progresses.

If realised, this has implications for #fisheries.

But how can we monitor this change in the real ocean?

Nitrogen isotopes!
rdcu.be/cAlW2 What are nitrogen (N) isotopes?

There is a heavy isotope (15-N) and a light isotope (14-N).

Some processes prefer to use 14-N more than 15-N. When phytoplankton use nitrogen, they prefer 14-N.

This increases the ratio of 15-N to 14-N in seawater.
Oct 26, 2021 • 6 tweets • 3 min read
Why do models underestimate the rate of ocean deoxygenation?

Well... @altagliabue and I used a suite of models and observations to try and answer this question.

agupubs.onlinelibrary.wiley.com/doi/10.1029/20…

@livunioceansci @Env_Sci Image Turns out that changes in ventilation in models are weaker than in the real ocean.

(We used CFCs and SF6 measurements to estimate ideal age) Image