Join us! GEOTRACES Online Seminar #7 – 24 November 15:00 CET

Topic: Sediment-Water Interface Processes & Boundary Exchange
Date/Time: November 24th, 15:00 CET
Moderator: Zhouling Zhang (GEOMAR, Germany)

Talk 1: Sediment-Seawater Interactions and Boundary Exchange: Scaling up from Local to Global Scale
Prof. Dr. Florian Scholz (University of Hamburg, Germany)

Abstract: Over the past two decades, the GEOTRACES program has revealed the profound influence of seafloor processes on marine trace metal biogeochemical cycles. However, robust approaches for scaling up local benthic fluxes and dynamically incorporating them into global biogeochemical models remain elusive for most elements. In this talk, I will review current approaches for upscaling benthic iron fluxes and discuss the key challenges in extending these approaches to other elements, accounting for additional biogeochemical processes, and representing diverse oceanographic settings, including high-latitude regions and the deep sea.

Talk 2: The supply of iron and silicon from glaciated bay and fjord sediments at the West Antarctic Peninsula
Dr. Rhiannon Jones (British Antarctic Survey, UK)

Abstract: High latitude fjords represent important environments for primary productivity, carbon storage, and the supply of glacier-derived dissolved and particulate metals (iron, manganese, silicon) to the high latitude oceans. Fjord sediments can receive high and variable volumes of lithogenic material from glaciers and sinking biogenic material. The microbially-mediated redox reactions within sediments moderate the reactivity and supply of iron and silicon back to the overlying water column. In this talk, I will show recent work demonstrating the drivers of silicon and iron supply from Antarctic coastal sediments to the overlying water column, with discussion of the role of glaciers and continued glacier retreat upon this process.

For more information and updates, check the seminar web page.