Eva A. CougnonUniversity of Tasmania · Institute for Marine and Antarctic Studies (IMAS)
Eva A. Cougnon
BSc, MS, PhD
About
18
Publications
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381
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Introduction
Additional affiliations
February 2019 - present
January 2017 - January 2019
Education
October 2012 - October 2016
September 2009 - June 2011
September 2006 - June 2009
Publications
Publications (18)
Sea ice forms a barrier to the exchange of energy, gases, moisture and particles between the ocean and atmosphere around Antarctica. Ice temperature, salinity and the composition of ice crystals determine whether a particular slab of sea ice is habitable for microorganisms and permeable to exchanges between the ocean and atmosphere, allowing, for e...
Recent marine heatwave (MHW) events in the Tasman Sea have had dramatic impacts on the ecosystems, fisheries and aquaculture off Tasmania’s east coast. However, our understanding of the large-scale drivers (forcing) and potential predictability of MHW events in this region off southeast Australia is still in its infancy. Here, we investigate the ro...
In the Southern Ocean, polynyas exhibit enhanced rates of primary productivity and represent large seasonal sinks for atmospheric CO2. Three contrasting east Antarctic polynyas were visited in late December to early January 2017: the Dalton, Mertz, and Ninnis polynyas. In the Mertz and Ninnis polynyas, phytoplankton biomass (average of 322 and 354...
Seafloor communities are a critical part of the unique and diverse Antarctic marine life. Processes at the ocean-surface can strongly influence the diversity and abundance of these communities, even when they live at hundreds of meters water depth. However, even though we understand the importance of this link, there are so far no quantitative spat...
Seafloor communities are a critical part of the unique and diverse Antarctic marine life. Processes at the ocean-surface can strongly influence the diversity and abundance of these communities, even when they live at hundreds of meters water depth. However, even though we understand the importance of this link, there are so far no quantitative spat...
The Southern Ocean has taken up more than 40% of the total anthropogenic carbon (Cant) stored in the oceans since the preindustrial era, mainly in subantarctic mode and intermediate waters (SAMW-AAIW). However, the physical mechanisms responsible for the transfer of Cant into the ocean interior remain poorly understood. Here, we use high resolution...
Ice shelf basal melt is the dominant contribution to mass loss from Antarctic ice shelves. However, the sensitivity of basal melt to changes in icescape (grounded icebergs, ice shelves and sea ice) and related ocean circulation is poorly understood. Here, we simulate the impact of the major 2010 calving event of the Mertz Glacier Tongue (MGT), East...
Observed thinning of the Totten Glacier in East Antarctica has cast doubt upon the stability of the East Antarctic Ice Sheet. Recent oceanographic observations at the front of the Totten Ice Shelf have confirmed the presence of modified Circumpolar Deep Water (mCDW), which likely promotes enhanced melting. Details of how this water accesses the she...
The dramatic calving of the Mertz Glacier tongue in 2010,
precipitated by the movement of iceberg B09B, reshaped the oceanographic
regime across the Mertz Polynya and Commonwealth Bay, regions where high-salinity
shelf water (HSSW) – the precursor to Antarctic bottom water
(AABW) – is formed. Here we present post-calving observations that suggest
t...
We present simulation results from a version of the Regional Ocean Modeling System modified for ice shelf/ocean interaction, including the parameterisation of basal melting by molecular diffusion alone. Simulations investigate the differences in melting for an idealised ice shelf experiencing a range of cold to hot ocean cavity conditions. Both the...
The dramatic calving of the Mertz Glacier Tongue in 2010, triggered by the impact of iceberg B09B, reshaped the oceanographic regime across the Mertz Polynya and Commonwealth Bay, regions where high salinity shelf water (HSSW) is formed, the precursor to Antarctic bottom water (AABW). Here we compare post-calving observations with high-resolution o...
As climate change reshapes the Earth's polar regions, scientists turn to drone-mounted cameras to measure sea ice. One expedition found out that flying drones near Antarctica isn't easy.
Ice shelves are an important control on Antarctic mass loss and global sea level rise. The ability of ice shelves to provide back stress on tributary glaciers is controlled by the rate at which mass is lost into the ocean. This is principally through basal melting and iceberg calving (calving has recently been suggested to be enhanced by strong bas...
Ocean observations around the Australian‐Antarctic basin show the importance of coastal latent heat polynyas near the Mertz Glacier Tongue (MGT) to the formation of Dense Shelf Water (DSW) and associated Antarctic Bottom Water (AABW). Here, we use a regional ocean/ice shelf model to investigate the interannual variability of the export of DSW from...
In February 2010, the tongue of the Mertz Glacier calved, releasing an 80x30km iceberg. We had anticipated this calving event and started observing it's development as well as gathering data to monitor the dynamics of the glacier upstream. Here, we present the main characteristics of Mertz Glacier in the context of this calving event. In addition t...