Ice coring in Antarctica
Ice coring in Antarctica

Research: Palaeoclimate Science

A key problem for reducing the uncertainty in climate projections is historical records of change are often too short to test the skill of climate models, raising concerns over our ability to successfully plan for future change. Published records only allow a robust reconstruction of global temperature back to around 1850 and show a ‘gradual’ warming trend of around 0.8°C. However, a wealth of geological, chemical, and biological records clearly indicate large changes in the climate system took place in the past. The forcing associated with these changes appear to have been relatively small, implying the associated thresholds (often described as ‘tipping points’) are considerably smaller than generally supposed. Gradual variations in the global climate on decadal to millennial timescales allow us to study the sensitivity of the climate system to external forcings, improving our estimates of the response to increasing concentrations of atmospheric greenhouse gases.

Against a backdrop of enhanced anthropogenic-driven climate change, it is essential we have a better understanding of the earth-ocean-atmosphere system. The Palaeoclimate Science team in the CCRC is actively researching a number of competing theories and models of annual to millennial-scale change, aiming to better understand the global system. By generating highly precise and accurate climatic changes from around the world, we are working to test the degree to which changes were synchronous (or not) across a range of periods in the geological past, and identify the mechanisms by which the climate signals were propagated globally. These results are critical for improving our ability to reduce future uncertainty.

The principal areas of research include:

  1. Terrestrial, ice and marine climate reconstruction for key periods including the last 2000 years, the termination of the last glacial period (Termination 1) and the Last Interglacial (Stage 5e);
  2. Modelling the Earth system using a range of models with varying degrees of complexity;
  3. Reconstructing different modes of climate, including the Southern Annular Mode (often abbreviated to SAM);
  4. the El Niño-Southern Oscillation (ENSO) and the East Asian Monsoon (EAM);
  5. Exploring the role of Southern Hemisphere Westerlies (SHW) and Thermohaline Circulation (THC) on the global climate system;
  6. Reconstructing past ice sheet extent and their contribution to global sea level;
  7. Modeling of climate-carbon cycle interactions on glacial to centennial time-scales;
  8. Climate forcing, including volcanic and solar;
    Ocean gateways and their influence on the evolution of the planet’s climate; and
  9. Improved methods for climate reconstruction, chronological control and data-model comparison.

Team members are also members of the national Palaeoclimate Consortium.

Team members working in palaeoclimate science include:

Latest news

Dr Michael Molitor Public lecture - De-carbonising for growth: why everyone is wrong about the costs of addressing climate change
20 April 2014
We will rapidly de-carbonize the global energy system not because we care sufficiently about the enormous risks flowing from a climate system profoundly modified by human activity but because, in the absence of this gigantic infrastructure investment opportunity, we will never generate sufficient economic growth between now and 2050. This inevitable outcome has dramatic implications for Australia's future energy supply and prosperity.

Plastic bottle caps found in the ocean (source: NOAA PIFSC) Ocean debris leads the way for castaway fisherman
05 February 2014
The fisherman who washed up on the Marshall Islands last weekend was very lucky to have stranded on a remote beach there. The currents in the Pacific Ocean would have inevitably taken him into the great garbage patch of the North Pacific, where he could then have been floating for centuries to come.

Man in heat wave Get used to heat waves: extreme El Niņo events to double
20 January 2014
Extreme weather events fuelled by unusually strong El Niņos, such as the 1983 heatwave that led to the Ash Wednesday bushfires in Australia, are likely to double in number as our planet warms.

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