Thomas M Holmes

Thomas M Holmes
University of Tasmania · Institute for Marine and Antarctic Studies (IMAS)

Doctor of Philosophy
Crunching Southern Ocean trace metal data from 5 different voyages!

About

14
Publications
2,265
Reads
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126
Citations
Citations since 2016
14 Research Items
126 Citations
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Introduction
Trace metal biogeochemist. Studying sources, sinks and cycling of trace metals in the Southern Ocean and their impact on primary productivity. Postdoc with the Australian Antarctic Program Partnership based at the Institute for Marine and Antarctic Studies, University of Tasmania.
Additional affiliations
July 2021 - present
University of Tasmania
Position
  • Trace Element Biogeochemist
Description
  • Examining trace element biogeochemistry in the Southern Ocean by observing and synthesizing the sources, sinks and internal cycling of iron and other fingerprint trace metals.
September 2019 - July 2021
University of Washington Seattle
Position
  • PostDoc Position
Description
  • Characterising provenance and bioavailability of aerosol trace elements into the Gulf of Alaska
March 2019 - September 2021
University of Tasmania
Position
  • Trace Element Marine Analytical Chemist
Description
  • Managed trace metal clean laboratories and operated trace metal analytical instruments.
Education
March 2014 - August 2019
University of Tasmania
Field of study
  • Chemical Oceanography

Publications

Publications (14)
Article
Full-text available
The availability of iron (Fe) to marine microbial communities is enhanced through complexation by ligands. In Fe limited environments, measuring the distribution and identifying the likely sources of ligands is therefore central to understanding the drivers of marine productivity. Antarctic coastal marine environments support highly productive ecos...
Article
Full-text available
Hydrothermal iron supply contributes to the Southern Ocean carbon cycle via the regulation of regional export production. However, as hydrothermal iron input estimates are coupled to helium, which are uncertain depending on whether helium inputs are based on ridge spreading rates or inverse modelling, questions remain regarding the magnitude of the...
Article
Full-text available
Despite widespread iron (Fe) limitation in the Southern Ocean, intense phytoplankton blooms are observed around productive coastal regions such as the Mertz Polynya (off George V Land and Adelie Land, East Antarctica; 140–155°E). Sources of Fe across coastal East Antarctica vary, with limited data available for late summer months. We investigated t...
Article
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...
Article
Full-text available
The Southern Ocean is the largest region in which iron limits the growth of phytoplankton. However, a phytoplankton bloom thousands of square kilometers in area forms each spring–summer in the Indian sector of the Southern Ocean, both above and to the east of the Kerguelen Plateau. The central region of the Kerguelen Plateau hosts the volcanically...
Article
Full-text available
Hydrothermal vents are a recognized source of trace elements to the ocean inventory. Nevertheless, the contribution of slow-spreading ridges remains poorly resolved. To address this, high-resolution dissolved (<0.45 µm) iron (dFe) and manganese (dMn) samples were collected during the GEOTRACES HERMINE GApr07 process study at the Mid Atlantic Ridge....
Article
Full-text available
Iron (Fe) is an essential micronutrient that controls phytoplankton growth in the Southern Ocean. Dissolved Fe (< 0.4µm) has been extensively studied due to its relatively high bioavailability. However, particulate Fe (> 0.4µm) is far more abundant and may also become bioavailable through biogeochemical processing. To assess natural Fe fertilisatio...
Article
At the southern part of the northern Kerguelen Plateau (Southern Ocean) is an active volcanic hotspot, hosting volcanically active Heard Island and McDonald Islands (HIMI), the former of which is largely covered by glaciers. While offshore waters are persistently Fe limited, typical of the broader Southern Ocean, near shore waters over the Kerguele...
Article
A seawater preconcentration system (seaFAST) with offline sector-field inductively coupled plasma mass spectrometry (SF-ICP-MS) detection was critically evaluated for ultra-low trace elemental analysis of Southern Ocean samples over a four-year period (2015-2018). The commercially available system employs two Nobias PA1 resin columns for buffer cle...
Article
Full-text available
This review aims to bring into focus the current understanding of hydrothermal systems and plume dynamics, tracers of hydrothermalism and the contribution of iron from hydrothermal vents to the global oceanic iron budget. The review then explores hydrothermal effect on surface ocean productivity. It is now well documented that scarcity of iron limi...
Poster
Full-text available
Low iron (Fe) concentrations limit biological productivity in over a third of the world’s oceans. The Southern Ocean (SO) is the largest of these regions of Fe deficiency. However, within the Indian sector of the SO lays an oasis of relatively Fe rich waters overlaying the Kerguelen Plateau. At the southern part of the central Kerguelen plateau is...

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