Impact of hydrothermalism on the ocean iron cycle



Tagliabue, A ORCID: 0000-0002-3572-3634 and Resing, J
(2016) Impact of hydrothermalism on the ocean iron cycle. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 374 (2081). 20150291-.

[img] Text
Tagliabue_Resing_Revised.pdf - Author Accepted Manuscript

Download (2MB)

Abstract

As the iron supplied from hydrothermalism is ultimately ventilated in the iron-limited Southern Ocean, it plays an important role in the ocean biological carbon pump. We deploy a set of focused sensitivity experiments with a state of the art global model of the ocean to examine the processes that regulate the lifetime of hydrothermal iron and the role of different ridge systems in governing the hydrothermal impact on the Southern Ocean biological carbon pump. Using GEOTRACES section data, we find that stabilization of hydrothermal iron is important in some, but not all regions. The impact on the Southern Ocean biological carbon pump is dominated by poorly explored southern ridge systems, highlighting the need for future exploration in this region. We find inter-basin differences in the isopycnal layer onto which hydrothermal Fe is supplied between the Atlantic and Pacific basins, which when combined with the inter-basin contrasts in oxidation kinetics suggests a muted influence of Atlantic ridges on the Southern Ocean biological carbon pump. Ultimately, we present a range of processes, operating at distinct scales, that must be better constrained to improve our understanding of how hydrothermalism affects the ocean cycling of iron and carbon.

Item Type: Article
Uncontrolled Keywords: hydrothermalism, ocean ventilation, ocean iron cycle, ocean biogeochemistry, ocean carbon cycle
Depositing User: Symplectic Admin
Date Deposited: 03 Nov 2016 15:30
Last Modified: 19 Jan 2023 07:26
DOI: 10.1098/rsta.2015.0291
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3004303