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Manganese biogeochemistry in the Southern Ocean, from Tasmania to Antarctica

Citation

Latour, P and Wuttig, K and van der Merwe, P and Strzepek, RF and Gault-Ringold, M and Townsend, AT and Holmes, TM and Corkill, M and Bowie, AR, Manganese biogeochemistry in the Southern Ocean, from Tasmania to Antarctica, Limnology and Oceanography pp. 1-16. ISSN 0024-3590 (2021) [Refereed Article]


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DOI: doi:10.1002/lno.11772

Abstract

Manganese (Mn) is an abundant element in the Earth's crust. However, its concentrations in open ocean seawater are low, where external inputs are scarce. In this study, we report the dissolved Mn and particulate Mn distributions in the Southern Ocean, measured along the GEOTRACES—SR3 transect, from Tasmania (Australia) to Antarctica in the Southern Ocean, during the austral summer 2018. Both dissolved Mn and particulate Mn concentrations were generally low away from localized sources (< 0.3 nmol L−1 and < 0.1 nmol L−1, respectively) along the transect. Our observations of a lower labile particulate fraction than previously measured suggest the Southern Ocean has a unique particulate Mn composition. Low surface dissolved Mn concentrations were attributed to biological uptake and few external sources. Our results suggest biological control of the Mn cycle was higher above the Antarctic continental slope, compared to the rest of the section, and our particulate Mn : P ratios indicated the presence of iron‐stressed diatoms south of the Sub‐Antarctic Front. We suggest low dissolved Mn surface concentrations may (co‐)limit phytoplankton growth in this region. Localized higher dissolved Mn concentrations were observed due to external sources, such as sedimentary and hydrothermal inputs. The presence of an eddy at the same latitude as a hydrothermal plume induced an upwelling of hydrothermally enriched waters up to 1000 m; however, no dissolved Mn inputs to the surface waters were observed. We suggest previous dissolved Mn inputs to the surface layer may be obscured by biological uptake.

Item Details

Item Type:Refereed Article
Keywords:chemical oceanography, Mn, trace metals, hydrothermal
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical oceanography
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Measurement and assessment of marine water quality and condition
UTAS Author:Latour, P (Miss Pauline Latour)
UTAS Author:Wuttig, K (Dr Kathrin Wuttig)
UTAS Author:van der Merwe, P (Dr Pier van der Merwe)
UTAS Author:Strzepek, RF (Dr Robert Strzepek)
UTAS Author:Gault-Ringold, M (Dr Melanie East)
UTAS Author:Townsend, AT (Associate Professor Ashley Townsend)
UTAS Author:Holmes, TM (Dr Thomas Holmes)
UTAS Author:Corkill, M (Mr Matthew Corkill)
UTAS Author:Bowie, AR (Professor Andrew Bowie)
ID Code:144222
Year Published:2021
Web of Science® Times Cited:3
Deposited By:Oceans and Cryosphere
Deposited On:2021-04-29
Last Modified:2021-05-03
Downloads:0

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