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Marine Biogeochemistry Podcast

Lennart T. Bach
Alkalinity
Nitrogen Fixation
Air-Sea CO2 Exchange
Wind Speed
Phosphorus
Reverse Weathering
Carbonate Chemistry
Oxygenic Clays
Dual Tracer Method
Eddy Covariance
Seawater Chemistry
Silicon
15N2
Carbon Dioxide (CO2) In Ocean
Peruvian Margin

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 fo... more

PublishesTwice monthlyEpisodes6Founded3 months ago
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Earth SciencesEducationScience

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Artwork for Marine Biogeochemistry Podcast

Latest Episodes

Why is is reverse weathering called reverse weathering? And, why is reverse weathering the most annoying term when you have to say it repeatedly on a podcast? While the second question remains unanswered, Sonja Geilert from Utrecht University provide... more

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 s... more

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... more

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 atmosph... more

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Recent Guests

Sonja Geilert
Assistant Professor in the Geochemistry Group
Utrecht University
Episode: Silicon I - Reverse Weathering - Sonja Geilert
Andrew Dickson
Professor of Marine Chemistry in the Marine Physical Laboratory Division
Scripps Institution of Oceanography, University of California, San Diego
Episode: Carbon II - Understanding alkalinity - Andrew Dickson
Caroline Slomp
Professor discussing phosphorus cycling in sediments
Redbound University
Episode: Phosphorus I - Phosphorus cycling in sediments - Caroline Slomp
David Ho
Professor at the University of Hawaii at Manoa
University of Hawaii at Manoa
Episode: Carbon I - air-sea CO2 exchange - David Ho
Mar Benavides
Senior Research Scientist exploring nitrogen fixation in the ocean
National Oceanography Centre, United Kingdom
Episode: Nitrogen I - the who's who in N2 fixation - Mar Benavides

Host

Lennart Bach
Host focused on marine biogeochemistry, frequently presenting and guiding interviews with researchers.

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Talking Points

Recent interactions between the hosts and their guests.

Phosphorus I - Phosphorus cycling in sediments - Caroline Slomp
Q: What are the key sinks and forms of phosphorus in sediments that contribute to permanent burial?
Key forms include organic phosphorus, iron oxide-bound phosphorus, apatite, and in coastal areas vivianite; burial efficiency depends on sedimentation rate and redox conditions, with iron oxides disappearing under reducing conditions and vivianite being sensitive to sulfide.
Carbon II - Understanding alkalinity - Andrew Dickson
Q: What are the practical challenges in defining and measuring alkalinity across different water types?
Definitions evolved from titration-based concepts to more comprehensive charge-balance descriptions; measuring alkalinity in seawater can be done very precisely, but freshwater systems introduce larger variability and more significant measurement challenges due to differing ionic compositions and organic contributions.
Carbon II - Understanding alkalinity - Andrew Dickson
Q: Why is alkalinity such a central concept in marine chemistry and climate science?
Because it can be measured reliably and, together with pH, allows us to infer the concentrations of all acid-base species in seawater, which helps us understand how the ocean stores CO2 and how biogeochemical processes, like calcification and buffering, alter seawater chemistry over time.
Nitrogen I - the who's who in N2 fixation - Mar Benavides
Q: Is there enough phosphate to support nitrogen fixation in the gyres or specifically in the Indian Ocean Gyre?
Phosphorus availability varies by gyre. Some regions, like the North Atlantic, are phosphorus-limited, whereas others, like the North Pacific, are less so. In the Indian Ocean, data are more sparse, but climatological evidence suggests relatively limited phosphorus and iron in some subregions, implying that the balance of these nutrients will control fixation activity depending on local subregions and seasonal changes.
Nitrogen I - the who's who in N2 fixation - Mar Benavides
Q: Is there consensus on the best method to measure nitrogen fixation rates in the ocean?
Yes, the community converged on a bubble-release method as the best compromise: inject a large bubble, shake to promote equilibration, then release the bubble and incubate with the gas tightly sealed so the 15N remains stable and doesn't continue dissolving. The method combines accuracy with practicality across different sample types, though the choice still depends on the specific experimental context, such as particle-associated fixation.

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Frequently Asked Questions About Marine Biogeochemistry Podcast

What is Marine Biogeochemistry Podcast about and what kind of topics does it cover?

This show centers on marine biogeochemistry, exploring how elements such as carbon, phosphorus, nitrogen, and silicon cycle through ocean systems. Each episode concentrates on a specific element or process, featuring researchers who illuminate mechanisms like reverse weathering, carbonate chemistry, phosphorus diagenesis, air-sea CO2 exchange, and nitrogen fixation. Guests come from universities and research institutes and often discuss measurement methods, historical context, and the implications of biogeochemical processes for climate, coastal ecosystems, and global carbon cycling. A standout pattern is the emphasis on technical depth, experimental approaches, and how evolving techniques shape our understanding of ocean chemistry. Listene... more

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Marine Biogeochemistry Podcast launched 3 months ago and published 6 episodes to date. You can find more information about this podcast including rankings, audience demographics and engagement in our podcast database.

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What guests have appeared on Marine Biogeochemistry Podcast?

Recent guests on Marine Biogeochemistry Podcast include:

1. Sonja Geilert
2. Andrew Dickson
3. Caroline Slomp
4. David Ho
5. Mar Benavides

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