Expert judgement provides better understanding of the effect of melting ice sheets | 1/6/2013 | Staff
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Melting ice sheets in Greenland and the Antarctic, and subsequent sea level rise (SLR) this will cause, is widely recognised as posing a significant threat to coastal communities and ecosystems.

Strategies and measures to mitigate and plan for the potential impacts are reliant on scientific projections of future SLR—conventionally provided using numerical modelling.

Projections - Uncertainty - Evolution - Greenland - Antarctic

Such projections remain challenging due to ongoing uncertainty regarding the evolution of the Greenland and Antarctic ice sheets, particularly in response to climate change.

Using a technique called structured expert judgment (SEJ), an international team of scientists, led by the University of Bristol, asked 22 ice sheet experts to estimate plausible ranges for future sea level rise due to the projected melting of each of the Greenland, West Antarctic and East Antarctic ice sheets under low and high future global temperature rise scenarios.

Findings - Week - Proceedings - National - Academy

Their findings are published this week in the journal Proceedings of the National Academy of Sciences.

Lead author Professor Jonathan Bamber from the University of Bristol's School of Geographical Sciences, said: "SEJ provides a formal approach for estimating uncertain quantities based on current scientific understanding, and can be useful for estimating quantities that are difficult to model.

Projections - SLR - Method - Probability - SLR

"Projections of total global SLR using this method yielded a small but meaningful probability of SLR exceeding two metres by the year 2100 under the high temperature scenario, roughly equivalent to 'business as usual', well above the 'likely' upper limit presented in the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC)."

The findings suggest that coastal communities...
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