A case for addressing the unresolved role of permeable shelf sediments in ocean denitrification

The marine nitrogen cycle is a main driver of ocean productivity and affects global climate. Despite decades of study, we still have an incomplete understanding of the role of the marine nitrogen cycle in the Earth system. While marine sediments play a major role in nitrogen cycling in the ocean, magnitudes and mechanisms are largely unconstrained. Recent research suggests that permeable sandy sediments on the highly energetic and dynamic continental shelf are key components of the marine nitrogen cycle, but data to quantify their contribution are lacking. Here, we use insights from measurements and modeling studies to substantiate the hypothesis that shelf sediments are an overlooked driver of the marine nitrogen cycle. Specifically, we propose that permeable shelf sediments are sites for intense nitrogen conversions and suggest a three-pronged approach to address unresolved controversies.

Automated summary

The marine nitrogen cycle is a major factor in ocean productivity and global climate, with recent research suggesting that permeable sandy sediments on continental shelves are key components. Despite decades of study, the role of shelf sediments in marine nitrogen cycling remains unclear and controversial, requiring further investigation to address unresolved issues.