Antarctic Sea Ice

The International Symposium on Sea Ice in a Changing Climate will be held in Hobart from March 10 – 14, 2014. Click here for more information.

Polar Science Open Day

To kick off the international symposium, the ACE CRC and the International Glaciological Society will hold a Polar Science Open Day in Hobart on March 9 from 10.30am – 2pm at the new IMAS Waterfront Building at 20 Castray Esplanade.

Find out what it’s like to be a polar scientist, to walk on the ice sheets of Antarctica, to understand the extraordinary seasonal freeze-up and melt back of the sea ice zone, to investigate the myriad organisms that inhabit the polar ocean and sea ice, and to explore the abyssal depths of the Southern Ocean. Come along to meet our polar scientists, listen to their unique experience, and play polar science games to understand the science we do and why it’s important. The event is aimed particularly at primary and high school students, but there will be great activities and talks for everyone with an interest in polar science.

Three fascinating talks 11am-noon, repeated 1-2pm:
Dr Andy Mahoney, University of Alaska
 – That cracks me up … understanding sea ice physics.
Dr Hauke Flores, Alfred Wegener Institute, Germany –All critters great and small … understanding the ecology of the sea ice zone.
Dr Mike Pook, CSIRO – If it’s snowing at Casey . . . understanding Hobart’s weather through Antarctica

Click here for an information flyer. Click here for the program.

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SEA ICE

This ACE research project focuses on how the Antarctic sea ice will respond to changes in climate and in turn what impact these changes will have on the climate system. We also investigate how these changes will impact on marine ecosystems.

Photo: Ice Floes

Ice Floes and PenguinsAntarctic sea ice covers a vast area of the Southern Ocean and is one of the most dynamic environments on the planet. The seasonal sea ice zone over which sea ice advances and retreats each year is about 30%, or approximately 14 million km2 of the Southern Ocean, reaching its maximum extent in September-October. Sea ice is a key factor in ocean-atmosphere interactions, global ocean circulation, and through the ice-albedo feedback mechanism an integral part of Earth’s climate system. It is also a dominant seasonal force in marine ecosystems.

While sea ice extent can be routinely measured from satellites, there are no data available to detect change in sea ice thickness and changes could currently be going unnoticed. During the satellite era (1979-present), no significant net reduction in Antarctic sea ice extent has been measured, although there are significant reductions around the Antarctic Peninsula with compensating increases elsewhere.  Changes in Antarctic sea ice extent are predicted under future climate change scenarios, although models for the 21st century show wide variability with a 25-40% decrease predicted. In relation to thickness, emerging techniques such as satellite radar and laser altimetry need calibration and validation. Around the coast of Antarctica, sea ice may be fastened to the shore or to grounded icebergs and remain immobile as a continuous sheet. The properties and extent of this land-fast ice, which is known to be an important habitat for penguins and seals,  are poorly understood and are also a subject of ACE research.

Robotic Underwater Vehicle

Photo: Remotely Operated Vehicle

ACE research in the sea ice zone will use sophisticated data collection techniques (such as Remotely Operated Vehicles) to measure sea ice thickness, extent and physical properties essential to calibrate and validate satellite observations.  These in situ observations will be combined with spatial and statistical modelling. The results will contribute to improved parameterisation of sea ice processes in climate models and reduced uncertainty in predictions.  We will  also improve  the measurement capability of coupled physical-biological processes in the sea ice zone, and determine the ecosystem impacts of predicted changes in Antarctic sea ice by evaluating linkages between ocean primary productivity and the structure and dynamics of the sea ice zone and the marine food web.

Projects and project leaders

  • The Role of Antarctic Sea Ice in the Climate System: Dr Rob Massom

Download: Sea Ice Position Analysis

News Story: The Edge of East Antarctica as you’ve Never seen Before

News Story: Building a picture of life in the sea-ice zone

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