Institute for Marine and Antarctic Studies Applied Marine Biogeochemistry GroupUniversity of Tasmania
Applied Marine Biogeochemistry Group / Podcast

Marine Biogeochemistry Podcast

Marine biogeochemistry studies how elements like carbon and phosphorus move through the ocean. In this podcast, we explore the processes that drive this cycling. I’m Lennart Bach from the Institute for Marine and Antarctic Studies at the University of Tasmania, and I invite marine biogeochemists to discuss different elements and the roles they play, from well-known to less studied. Each episode focuses on one element and a specific topic, aimed at researchers and students.

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Marine Biogeochemistry Podcast cover art
Carbon II - Understanding alkalinity - Andrew Dickson cover art
61:22

Carbon II - Understanding alkalinity - Andrew Dickson

Understanding alkalinity is one of the "eight-thousanders" in marine biogeochemistry. Luckily, we have Prof. Andrew Dickson, who has mapped this dangerous territory like few others have before. In this episode, I asked Andrew to go on a trip with a steep learning curve. We navigated acid-base equilibria, organic alkalinity, the future of Certified Reference Materials and could just get around a disastrous debate on pH scales. This was the first episode I ever recorded. So, climbing Mount Everest with zero experience. What could possibly go wrong?!

Phosphorus I - Phosphorus cycling in sediments - Caroline Slomp cover art
37:06

Phosphorus I - Phosphorus cycling in sediments - Caroline Slomp

The number of scientists studying marine phosphorus cycling may align to the Redfield ratio. For every 106 scientists studying carbon, there is one studying phosphorus. This is at least the approximation made by Prof. Caroline Slomp, one of our world's experts on the marine P cycle. In this episode, I ask questions how P cycles through marine sediments. The challenge is that understanding the P cycle also requires understanding of how iron, sulfur and other elements interact. It is a complex topic, yet getting an idea of what is going on within seafloor sediments feels very rewarding.

Carbon I - air-sea CO2 exchange - David Ho cover art
37:12

Carbon I - air-sea CO2 exchange - David Ho

When CO2 enters the ocean it has to cross the air-sea interface. This is surprisingly slow! And, thankfully reasonably well understood due to scientists like Prof. David Ho. In this episode, I talk with David about the flux of CO2 between the atmosphere and the ocean. David assumed this would be a podcast about marine CO2 removal, which is why he uses its abbreviation "marine CDR" occasionally (sorry for the insufficient briefing David!)

I had a minor sound carfuffle at the beginning and I had to cut a small part of the intro. We therefore start quite abruptly.

Nitrogen I - the who's who in N2 fixation - Mar Benavides cover art
54:23

Nitrogen I - the who's who in N2 fixation - Mar Benavides

All life, and certainly this podcast, critically depends on nitrogen (N). It all starts with the fixation of N2 gas to make it available for life, so I reached out to Dr. Mar Benavides from National Oceanography Centre in the UK to ask a lot of dumb, and some extremely sophisticated questions on the matter.

Thanks Mar for being the Guinea pig on this podcast!

This conversation was recorded on the 10th of April, 2026. More updates on this podcast can be found at www.marine-biogeochemistry.org/podcast

Introduction // Materials & Methods cover art
3:01

Introduction // Materials & Methods

Welcome to the marine biogeochemistry podcast.

In this brief trailer I introduce myself, how this podcast is structured, who it is intended for, and what it aims to achieve.

Please share your recommendations for guests, topics, or conversations you believe should be featured.

This conversation was recorded on the 2nd of April, 2026. More updates on this podcast can be found at www.marine-biogeochemistry.org/podcast

Cheers, Lennart