Friday, June 4, 2010

Speliothem records show the polar bears are probably safe


You all know what a speliothem is, don't you? Just in case you weren't listening when that word was explained in class, "Speleothems are secondary mineral deposits formed in caves. Stalactites and stalagmites are speleothems, and they come in a wide variety of sizes and shapes...

The speleothems give us a record of what is called the 'delta oxygen 18' (∂18O) value. This value is related to the temperature... What can we learn from the speleothems?...

As is shown in the Greenland ice core records, we are currently at the cold end of the Holocene (the current interglacial).

• Recent phenomena (Roman Warm Period, Medieval Warm Period, Current Warm Period) are scarcely visible at this scale. So much for the 'uprecedented' nature of the recent rise.

• The polar bears are not in any danger from the recent rise.

• What’s up with the big jump and drop about 12000 years ago?...this is almost certainly the 'Younger Dryas' event...The Younger Dryas stadial, also referred to as the Big Freeze, was a geologically brief (1,300 ± 70 years) cold climate period between approximately 12,800 and 11,500 years ago (between 10,800 and 9,500 BCE)."

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