Paper: Scenarios of Deoxygenation of the ETNP During the Past Millennium as a Window Into the Future of OMZs

Please take a look at our new paper, where we discuss the potential mechanisms of fast-paced Oxygen Minimum Zone (OMZ) variability in coastal regions of the Eastern Tropical North Pacific (ETNP).

Over glacial-interglacial time scales, dissolved oxygen availability in the ocean is known to be controlled by global climatic and circulation trends sometimes even decoupled from primary productivity. On the contrary, at the submillennial resolution, marine productivity is the driving force that shifts the OMZ from contracted to an expanded state and vice versa. We hypothesize that the Pacific Decadal Oscillation (PDO) is the driving mechanism by which upwelling rates increase in the ETNP as the colder PDO phases kick in (more frequent La Niña years) leading to higher productivity and OMZ expansion.

Link to the paper 

Direct link to the PDF

Goldschmidt 2018 Pop-Up Talks event


Are you attending Goldschmidt 2018 in Boston, USA? If so, do you feel passionate about your research and want to tell us about it? Sign up for an exciting Pop Up Talks event at Goldschmidt that is open to anyone who wants to share their experience as a geochemist. Please note this is NOT meant to be a place to give a science talk that would fit into an existing science session.

Rather you are invited to give a brief, 5-minute presentation in the style of a TED or ‘3-Minute Thesis’ talk – that explains any aspect of your work or life as a scientist in an engaging way. These talks will be free of jargon, as they are meant to be entertaining and engaging. Talks can be about any aspect of geochemistry that you are passionate about, whether it be your latest data, your international travels, an outreach program you participated in, or the challenges of lab work or life as a scientist. Past talks have included: poetry about Fe, Mn, and O, performed comedy routines about mass spectrometry, and detailed the woes of e-mail. Amidst full days of formal, jargon-dense scientific talks, the Pop Up Talk series is meant to be a fun, community-building experience for those in attendance.

If you are interested in participating in this exciting event, please send us an email with the title of your talk and how you would like to present it to before the 3rd August.

This will allow us to schedule the necessary time and space. Due to potential limitations, acceptance will be on a first-come-first-served basis. We will contact you with more information once the deadline has passed.

More information and examples

Ocean Deoxygenation Conference 2018 (Kiel, Germany)

The deadline for abstract submission to Ocean Deoxygenation Conference is March 31st, 2018. This promising conference organized by the Collaborative Research Center SFB 754 will focus on past, present and future drivers and consequences of ocean deoxygenation. The biggest names who work on modern deoxygenation were invited as keynote speakers who will lead each one of the scientific topics presented at the Audimax auditorium in Kiel University.

It will be awesome to also see a good participation of early career scientists! Hopefully I will be able to make it there myself too.

Ocean Deoxygenation Conference 2018

Link to conference website

Goldschmidt 2018 Session: De-oxygenation and organic carbon burial in Earth’s history

Dear friends! Please consider submiting an abstract and attending our session at Goldschmidt 2018 in Boston, USA:


07b: De-oxygenation and organic carbon burial in Earth’s history

The geologic record captures only a portion of the complex biogeochemical interactions involving marine primary productivity and oxygenation. Apparent decoupling between export production in the water column, oxygen content and burial of organic matter as observed in modern environments has led to strong debates on the fidelity of classic productivity (Corg, excess-Ba, barite, organic-P, biogenic SiO2) and redox proxies (Cd, Cr, Mo, Ni, U, V, Zn, FeHR/FeT, Fepyr/FeHR). Disentangling individual processes is often challenging; however, growing interest in proxy development and state-of-the-art analyses has led to major breakthroughs. Inclusive studies are essential to understanding the dynamics of organic matter burial and oxygenation over a range of timescales while using a complementary array of investigative strategies.

This session encourages submissions dealing with four major themes: (i) The reconstruction of hypoxia and anoxia in past and present oceans and their relationship with life; (ii) The development of techniques to reconstruct productivity and redox through time; (iii) Improvements of our understanding of the paleoenvironmental conditions during organic matter accumulation and source rock deposition; (iv) Data and modelling insights into the complexity of physical and biogeochemical processes controlling oxygen distributions; (v) Novel approaches to forecast the evolution of hypoxic and anoxic conditions into our not-too-distant future.

We specifically welcome contributions that highlight the spatial and temporal variability and drivers of (de)oxygenation during the Anthropocene and throughout the Phanerozoic, highlighting extinctions, oceanic anoxic events and other major climatic perturbations associated to large accumulation of carbon in the rock record (e.g. Middle Devonian to Early Mississippian, Late Jurassic, Middle Cretaceous).

Link to session website


See you in Boston!

Consider submitting to “Facing Marine Deoxygenation” Research Topic at Frontiers

Great opportunity to submit a manuscript to an important research topic: “Facing Marine Deoxygenation”. As global temperature trends continue to rise many marine regions are experiencing a slow decrease in dissolved oxygen. This has been attributed to the direct effect of warming on oxygen solubility and indirect climatic and oceanografic feedbacks not yet well understood. This research topic invites the community to address the complex interactions that lead to past, present and future changes of deoxygenation, significantly exacerbated by anthropogenic pressure.

OMZ expansion (Gilly et al., 2013)

Humboldt squid range expansion attributed to Oxygen Minimum Zone shoaling in the Eastern Tropical North Pacific (Gilly et al., 2013)

More details on this multidisciplinary research topic here


Release: GEOTRACES Intermediate Data Product 2017

The GEOTRACES group just made the new edition of the Intermediate Data Product publicly available. It was announced and released during today’s special event at Goldschmidt conference (Paris, France). The database that now includes the Pacific and Southern Ocean revolves around several remarkable discoveries such as the importance of dissolved Fe supply from hydrothermal vent systems into the ocean (Fitzsimmons et al., 2017).

Dissolved Fe contribution from hydrothermal vent systems into the Pacific Ocean (, partially based on Fitzsimmons et al., 2017)

You can access the data by clicking here