🌊A busy day for @mbarinews.bsky.social science and @globaloceanbgc.bsky.social, the major US contribution to @bgc-argo.bsky.social.

BGC-Argo floats used to study marine heatwaves and oxygen deficient zones. Great work by Mariana Bif - University of Miami, former MBARI postdoc.

another compound is absorbing light in the UV with the spectral characteristics of thiosulfate (panel f). The float data suggest an active sulfur cycle, consistent with much recent genomic data.

The floats enable an entirely new vision into the variable metabolism of oxygen deficient regions

Nitrite comes and goes (panel e), often following organic carbon export events (panel a). That’s consistent with exported organic carbon controlling heterotrophic processes that enable complete reduction of nitrate to N2, rather than accumulation of nitrite.

But more interesting,

As the float goes north, it samples cooler water that mixes deeper (its less dense) in winter, reaching depths with high NO3. This brings NO3, an essential nutrient, to the surface, fertilizing plankton, and chlorophyll blooms appear.

What does this trend mean for a warming ocean?

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The demo is based on this video: www.youtube.com/watch?v=eZzp...

Hi Andrew, Happy Thanksgiving. Yes, the paper points out several critical studies that found no lead impact - mostly because their blanks were contaminated, the methods didn't have sufficient detection limits....