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GRADES Research Programme

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The Glacial Retreat in Antarctica and Deglaciation of the Earth System (GRADES) research programme, part of the British Antarctic Survey research strategy Global Science in an Antarctic Context (GSAC) 2005–2009


Glacial Retreat in Antarctica and Deglaciation of the Earth System (GRADES)

Principal Investigator: Professor David Vaughan

The Challenge

GRADES will investigate the state and stability of the Antarctic ice sheet. A key objective is to improve predictions of Antarctica’s contribution to global mean sea level rise.

The West Antarctic Ice Sheet (WAIS) may be unstable because its base lies on rock below sea level. Measurements from satellites show that there is currently a substantial imbalance in part of the WAIS, which is contributing significantly to sea-level rise. BAS and the University of Texas, supported by US logistics, have already completed an airborne radio-echo sounding survey of approximately one third of the WAIS, covering the region where the most rapid change is taking place. GRADES will study further this important area to better predict how the WAIS contributes to sea level rise.

GRADES will also develop ice-sheet models and test them using newly acquired ice-sheet histories. We use satellite data, reconstructions of past states of the ice sheet, and new data assimilation techniques to learn more about how ice sheets develop and evolve

High winds causes problems at a field camp

Objectives

  • Understand the role of ice sheet disintegration in global climate change
  • Assess what is causing the current imbalance in the WAIS
  • Search for evidence of previous periods of rapid ice loss in the WAIS
  • Determine the contribution of the WAIS to future sea level change

Relevance to Global Science

Antarctica’s vast ice sheets contain a volume of water equivalent to a sea-level rise of 57m. Even small percentage changes in this volume would have profound social and economic consequences worldwide, since hundreds of millions of people and much important infrastructure are located on low-lying coastal areas. We aim to improve our understanding of Antarctic deglaciation to allow us to predict future sea level rise more accurately.

Delivering the Results

GRADES will analyse models of ice sheet evolution, covering a period from the last ice age to a thousand years into the future.We will use existing and new data to assess the stability of the WAIS and its contribution to future sea level rise. GRADES has links with GEACEP, CACHE, ACES, and COMPLEXITY.

Component Projects