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Project details
| Title: | Subantarctic Biogeochemistry of Carbon and Iron, Southern Ocean Time Series site |
| Id: | 2478 |
| Investigator(s): | Philip Boyd
University of Tasmania - Institute of Marine and Antarctic Studies [details] |
| Description: | The aim of this project is to enhance our understanding of the interlinked biogeochemical cycles of iron and carbon in the Southern Ocean to better understand how intra-seasonal, seasonal and interannual variability in iron supply and recycling influences the productivity and export of carbon into the ocean’s interior in the subantarctic circumpolar ring. |
| Description (full): | The subantarctic water mass forms a circumpolar ring which comprises half of the open waters of the Southern Ocean. Complex environmental forcing controls its productivity, ecology and biogeochemistry both in the present day and in the geological past. An improved mechanistic understanding of these controls on the marine biota is needed, and will provide the context to better interpret observations being obtained at unparalleled resolution by the SOTS moorings. Our study will forge strong links with SOTS by determining how environmental forcing manifests itself in biological and biogeochemical signatures across a range of scales. A better understanding of this relationship will aid the development of a state-of-the-art coupled iron and carbon biogeochemical model which will be validated using future multi-property time-series observations. Our main aim is to enhance our understanding of the interlinked biogeochemical cycles of iron and carbon in the Southern Ocean to better understand how intra-seasonal, seasonal and interannual variability in iron supply and recycling influences the productivity and export of carbon into the ocean’s interior in the subantarctic circumpolar ring. Additional aims include: • Elucidation of the relative roles of iron supply versus biological and photochemical recycling in driving subantarctic primary productivity and export fluxes. • Resolution of the interplay of multiple environmental controls – irradiance, mixed layer depth, trace element supply (zinc, copper etc), silicate supply, iron availability – across a range of temporal and spatial scales – to better predict changes in rates of primary productivity. • Enhancement of knowledge on the interplay of mesoscale and submesoscale physics and biogeochemistry in the vicinity of the SOTS site to better understand the degree of coupling and integration of surface ocean processes with those in the subsurface ocean (such as the sensors and particle traps on the SOTS mooring). |
| Years: | 2019 |
Publications
Journal Article
- Janssen, David J.,Rickli, Jörg,Abbott, April N.,Ellwood, Michael J.,Twining, Benjamin S.,Ohnemus, Daniel C.,Nasemann, Philipp,Gilliard, Delphine,Jaccard, Samuel L. (2021) Release from biogenic particles, benthic fluxes, and deep water circulation control Cr and δ53Cr distributions in the ocean interior. Earth and Planetary Science Letters 574 pp117163-. 10.1016/j.epsl.2021.117163
- data sourced from following voyages IN2018_V04 IN2018_V02
- Paine, Ellie R.,Boyd, Philip W.,Strzepek, Robert F.,Ellwood, Michael,Brewer, Elizabeth A.,Diaz-Pulido, Guillermo,Schmid, Matthias,Hurd, Catriona L. (2023) Iron limitation of kelp growth may prevent ocean afforestation. Communications Biology 6 pp-. 10.1038/s42003-023-04962-4
- data sourced from following voyages IN2019_V02
- Schallenberg, Christina,Strzepek, Robert F.,Schuback, Nina,Clementson, Lesley A.,Boyd, Philip W.,Trull, Thomas W. (2020) Diel quenching of Southern Ocean phytoplankton fluorescence is related to iron limitation. Biogeosciences 17 pp793-812. 10.5194/bg-17-793-2020
- data sourced from following voyages IN2018_V02
List of surveys that this project was on. Click on column header to sort.
Use [details] link to view survey details (map, reports, metadata etc) including links to download data.
| Survey | Investigator | Description |
|---|---|---|
| IN2019_V02 [details] |
Thomas W. Trull (CSIRO O&A) | Integrated Monitoring Observing System Time Series automated moorings for climate and carbon cycle studies southwest of Tasmania (Chief Scientist: Professor Tom Trull, ACE-CRC) The Southern Ocean Time Series provides world-leading automated observations from deep-ocean moorings of the exchanges of heat, water, carbon dioxide, and oxygen between the ocean and atmosphere, and the physical and biological processes that control them. These results contribute to forward projections of anthropogenic climate warming, inform the setting of emissions targets, illuminate controls on climate variability, and provide a baseline for impacts on ocean pelagic ecology. Sensor data is returned live to the internet and samples are returned annually for further study in shore laboratories. Surface and subsurface subantarctic Biogeochemistry of Carbon and Iron, Southern Ocean Time Series site (Lead Principal Investigator: Prof Philip Boyd, UTAS) The Southern Ocean straddles the waters between Australia and Antarctica and has two distinct regions – the subantarctic and the polar seas. The latter is comprehensively studied by expeditions by Australia’s Antarctic Division, whereas the subantarctic has received much less attention. This voyage aims to determine processes within the subantarctic environment that control productivity, foodwebs and cycles of elements such as carbon. Enhanced understanding will maximise investments, such as in ocean time-series in subpolar waters, and enable better predictions to be made on how marine life and chemistry are controlled by both natural and human-made shifts in climate and ocean conditions. |
| IN2018_V02 [details] |
Thomas W. Trull | Integrated Monitoring Observing System Time Series automated moorings for climate and carbon cycle studies southwest of Tasmania (Chief Scientist: Professor Tom Trull, ACE-CRC) The Southern Ocean Time Series provides world-leading automated observations from deep-ocean moorings of the exchanges of heat, water, carbon dioxide, and oxygen between the ocean and atmosphere, and the physical and biological processes that control them. These results contribute to forward projections of anthropogenic climate warming, inform the setting of emissions targets, illuminate controls on climate variability, and provide a baseline for impacts on ocean pelagic ecology. Sensor data is returned live to the internet and samples are returned annually for further study in shore laboratories. Subantarctic Biogeochemistry of Carbon and Iron, Southern Ocean Time Series site (Lead Principal Investigator: Professor Philip Boyd, UTAS) The Southern Ocean straddles the waters between Australia and Antarctica and has two distinct regions – the subantarctic and the polar seas. The latter is comprehensively studied by expeditions by Australia’s Antarctic Division, whereas the subantarctic has received much less attention. This voyage aims to determine processes within the subantarctic environment that control productivity, foodwebs and cycles of elements such as carbon. Enhanced understanding will maximise investments, such as in ocean time-series in subpolar waters and enable better predictions to be made on how marine life and chemistry are controlled by both natural and human-made shifts in climate and ocean conditions. |