John J. Cullen

@johncullenocean.bsky.social

4060 Followers 56 Following

Professor Emeritus in Oceanography, Dalhousie University. 🇨🇦🧪🌊 I've spent a long time trying to understand and explain how the ocean works.

Slide illustrating a fish kill off Oregon in 2002. It had nothing to do with OIF.
Portrait of Mary Somerville with list of some accomplishments and picture of 10-pound note
From Eppley and Peterson, 1979 (Nature 282: 677-680): "To what extent does the sinking flux of particulate organic carbon constitutes a 'sink' for atmospheric CO 2 from fossil fuel burning? Since dissolved inorganic carbon moves upward along with the vertically transported nitrate, in approximately the Redfield ratio of 106 C atoms: 16 N atoms, only the sinking flux due to new production associated with nitrogen fixation and nutrient inputs from terrestrial and atmospheric sources can be identified as a biologically-mediated transport of atmospheric carbon dioxide to the deep ocean." (Read the whole paper for context.)