GEOTRACES sessions at EGU 2023

Dear colleagues,

We would like to draw your attention to the following sessions at EGU General Assembly 2023 (23–28 April 2023, Vienna, Austria and online).

The abstract submission deadline is 10 January 2023, 13:00 CET.

GEOTRACES sessions:

OS3.1, Response of ocean biogeochemical cycles to climate change
Convener: Alessandro Tagliabue | Co-conveners: Charlotte Laufkötter, Christopher Somes, Camille Richon

Climate induced alterations to net primary production act alongside changes to biogeochemical cycling of oxygen and nutrients to affect marine ecosystem structure and function, as well as the ocean carbon cycle. Climate change is driving alterations to these key components of ocean health, both via long term changes and the emergence of extremes. The 6th Climate Model Intercomparison Project provides new opportunities to analyze the long-term changes in biogeochemistry under different emissions scenarios, as well as to explore the emergence and potential impacts of extremes. Additionally, historical variability linked to climate oscillations such as ENSO and the Southern Annular Mode provide an opportunity to bring insights from observed changes and impacts.

This session invites submissions, from both observations and modelling efforts, that address the impact of historical variability and climate change on net primary production, biogeochemical cycling of nutrients and oxygen, and the ocean carbon cycle, including cascading effects for marine ecosystems to modulate biodiversity and ecosystem services.

OS3.2, Global ocean budgets and relationships to the carbon cycle and marine records
Convener: Yael Kiro | Co-conveners: Netta Shalev, Nolwenn Lemaitre, Adi Torfstein

Ocean chemistry is directly related to both ‘short-term’ and ‘long-term’ carbon cycles through alkalinity input, the degree of saturation to carbonate minerals, and complex controls on the carbon’ biological pump’ transferring organic and inorganic carbon from the surface to the deep ocean. The elements’ and isotopes’ different sources and sinks dictate their concentration and ratio in the ocean. Weathering and elements transport through rivers is one of the significant sources of the ocean. At the same time, precipitation, scavenging, and adsorption onto particulate matter remove elements from the sea into the sediments. While some processes are widely accepted and are often considered, other mechanisms are overlooked and may play an essential role in specific elements or isotope budgets. For example, processes such as particulate matter supply, hydrothermal reactions at mid-ocean ridge axes or flanks, and various reactions within marine sediments are also significant. They may serve as a source or a sink for the different elements. In addition, circulation along subduction zones, coastal aquifers and submarine groundwater discharge, and seafloor low-T weathering are often overlooked and may be as significant as the other processes.

Isotope systems such as Sr, Nd, S, C, and N are often used in paleoclimate and paleoceanography. Others, like Mg, Ca, Li, Ni, Cd, Mo, and U, are evolving promising proxies. The variations of the isotope systems are used to interpret past environmental changes in Earth’s history. This interpretation heavily relies on these isotope systems’ budget in the ocean. Thus, understanding their sources and sinks is crucial for assessing global changes on Earth.

We invite submissions dealing with any aspect of elemental or isotope budgets in the ocean, particularly those covering overlooked processes that may be significant. We encourage abstracts, including modeling global changes in the ocean and on Earth, especially those that deal with the carbon cycle and possible effects on climate in the past, present, and future.

To submit an abstract please follow the instructions available here:

An updated list of GEOTRACES relevant sessions at the 2023 EGU will be available at:

If you wish your session to be included in this list, please send an e-mail to

Best regards,