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 Melting Ice Glaciers Make Sea Levels Rise

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PostSubject: Melting Ice Glaciers Make Sea Levels Rise   Tue Apr 05, 2011 2:19 pm

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Melting mountain glaciers are making sea levels rise faster now than at any time in the last 350 years, according to new research.

Universities at Aberystwyth, Exeter and Stockholm looked at longer timescales than usual for their study.

They mapped changes in 270 of the largest glaciers between Chile and Argentina since the "Little Ice Age".

Studies showed glaciers have lost volume on average "10 to 100 times faster" in the last 30 years.

The rapid melt rate is linked to their contribution to global sea level.

The new research was published in the journal Nature Geoscience on Sunday.

Their survey centred on remotely sensed images of outlet glaciers of the south and north Patagonian icefields, but used longer timescales than previous studies.

The glaciers straddle the Andes, on the border between Chile and Argentina.

The northern icefield extends for nearly 200 km and covers a surface of 4,200 square km, while the southern icefield is more than 350km long, covering 13,000 square km.

The scientists mapped changes in the position of the glaciers since the "Little Ice Age".

This took place around 1870 for the north icefield and around 1650 for the southern icefield, the last time that they were much larger in the recent past.

Lead author, Professor Neil Glasser of Aberystwyth University, said: "Previous estimates of sea-level contribution from mountain glaciers are based on very short timescales.

"They cover only the last 30 years or so when satellite images can be used to calculate rates of glacier volume change.
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