Developing palaeoclimate records to interrogate Indian Ocean continent climate coherencies from East Antarctic ice core records
Project 1: Atmosphere / Project 2: Ice Cores
The project aim is to develop ice core records of climate from the southern Indian Ocean to explore signals and causes of hydroclimate coherencies between Australia and southern Africa. I will use ice core records of aerosols (representing Southern Ocean wind variability) and snowfall accumulation (precipitation) from two coastal East Antarctic ice cores: Mount Brown South and Law Dome. I will explore the atmospheric dynamics controlling the teleconnections between Mount Brown South/Law Dome and southern Africa/Australia using atmospheric reanalyses and climate model outputs to determine drivers of climate variability in the recent era and millennium.
Supervisors and their affiliation:
Tessa Vance1, Alexander Fraser1, Taryn Noble2, Nerilie Abram3, Andrew Klekociuk1,4
1 Australian Antarctic Program Partnership, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Australia.
2 Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Australia.
3 Research School of Earth Sciences and ARC Centre of Excellence for Climate Extremes, Australian National University, Canberra, Australia.
4 Australian Antarctic Division, Antarctic Climate Program, Department of Agriculture Water and the Environment, Kingston, Australia.
The project aligns with the AAPP Objective as it will help to better constrain regional climate variability over the last 1,000-2,000 years in the southern Indian Ocean (including links to Australia and southern Africa) using ice cores, atmospheric reanalyses and climate model outputs
I recently started a Ph.D. (University of Tasmania, with Tessa Vance, Alexander Fraser, Taryn Noble, Nerilie Abram and Andrew Klekociuk), working on developing records of climate in the southern Indian Ocean using high-resolution ice cores collected from East Antarctica. I have a particular intertest in southern African and Australian rainfall variability over the past millennium. In 2018, I completed a B.S. (Marine Science major, University of Western Australia), and in 2020 I completed a Masters of Marine and Antarctic Science (University of Tasmania, with Tessa Vance and Alexander Fraser). My Masters project involved the preliminary analysis of a new East Antarctic ice core collected from Mount Brown South. During this time I worked as a Research Assistant at the University of Tasmania, which involved operating and developing methods for a line-scanner machine that produces high-resolution scans of ice cores, and contributed to the routine preparation of trace chemistry clean ice core samples for analysis. In February 2020, I presented a talk at the Australian Meteorological and Oceanographic Society (AMOS) Conference in Perth. I also received the AMOS Regional Award for Academic Achievement for my Masters Thesis.
Physical controls of Southern Ocean ice-associated primary production
This project aims to understand the physical influences on the spatial and temporal variability of ice algae and phytoplankton in the Southern Ocean. Linking existing ship-based underway data with satellite-derived sea-ice concentration data and using novel data streams from under-ice BGC floats, this project aims to detect and investigate drivers of the spatial distribution and temporal development of under-ice phytoplankton blooms off East Antarctica. This study will also provide the first time-series of ice algal accumulation for Antarctic land-fast sea ice, which will improve our parameterization of ice algal dynamics into global productivity models.
Supervisors and their affiliation:
Christina Schallenberg1; Klaus Meiners2,3; Sophie Bestley1; Alex Fraser3
1 Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Australia
2 Australian Antarctic Division, Antarctic Climate Program, Department of Agriculture, Water and the Environment
3 Australian Antarctic Program Partnership, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Australia
This project contributes to address AAPP objectives on the effects of sea-ice change on primary productivity and biogeochemical processes in the Southern Ocean by combining quantitative analyses of ship-based and BGC-Argo data, remote sensing products, and newly collected in-situ data.
I am interested in how physical and biological processes influence the magnitude, composition, and phenology of marine primary production and nutrient dynamics. I completed my BSc hons (Dalhousie University) in 2015 and successfully defended my MSc (University of Manitoba) in 2018. My masters focused on how natural physical gradients influence sea ice algal communities in the Arctic, particularly how under-ice currents and riverine input can influence nutrient dynamics and ice algal biomass. For this work, I received the Weir Award for the most outstanding master’s thesis and a Fellowship in Arctic Research for leadership and excellence in Arctic research. I have been fortunate to participate in several field campaigns in the Arctic, including leading a successful one-month-long ice camp with our international collaborators while a graduate student. Since then, I have worked as a research associate at the Centre for Earth Observation Science (University of Manitoba), examining how biological processes are affected by freshwater input into the marine system before starting my Ph.D. at the University of Tasmania