Cathryn Wynn-Edwards

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

Changes in Southern Ocean biogeochemistry: observations from moored observatory, remote access sampling, sensor arrays.

The Southern Ocean absorbs a great deal of heat and carbon dioxide (CO2) from the atmosphere, helping to shape the global climate. This oceanic service comes at a cost: the Southern Ocean is becoming warmer, fresher, less oxygenated, and more acidic—in effect heating up, losing breath, and becoming corrosive. The consequences of these changes are d...

The Southern Ocean (SO) is a globally significant region for carbon export, with the capacity for increased biological carbon pump (BCP) strength due to under-used surface macro-nutrients. Assessing how climate change will alter this region’s ability and efficiency to take up atmospheric CO2 is paramount. Long-term particle flux observations are im...

This report details the quality assessment and control procedures applied to the particle flux data collected by the Subantarctic Zone (SAZ) sediment trap moorings. The datasets are publicly available via the AODN Data Portal https://portal.aodn.org.au/search.

Increased seawater pCO(2) has the potential to alter phytoplankton biochemistry, which in turn may negatively affect the nutritional quality of phytoplankton as food for grazers. Our aim was to identify how Antarctic phytoplankton, Pyramimonas gelidicola, Phaeocystis antarctica, and Gymnodinium sp., respond to increased pCO(2). Cultures were mainta...

Around one third of all anthropogenic CO2 emissions have been absorbed by the oceans, causing changes in seawater pH and carbonate chemistry. These changes have the potential to affect phytoplankton, which are critically important for marine food webs and the global carbon cycle. However, our current knowledge of how phytoplankton will respond to t...