Last Of The Laurentide

The last of the six ice ages Earth experienced is the Quarternary, lasting the prior 2.58 million years. Understand what an ice age is – a period in which the poles have ice caps, not a period when we see glaciers in temperate latitudes. Those are stadials, and the last time we had those glaciers was during the Younger Dryas, which ended about 12,000 years ago. One of the periodic ice sheets in North America was the Laurentide.

And researchers have found the last of the Laurentide, that solid white spot in the middle of Baffin Island is the Barnes Ice Cap.

Baffin Island

Baffin Island

This five hundred meter thick sheet has just three centuries left at our current 400 ppm of CO2.

I wonder if that last little patch of ice will be a redoubt for reindeer or polar bear/grizzly hybrids, the way Wrangel Island was for the mammoths. That’s ten generations in our future, but it’s the blink of an eye in geological terms.

I don’t know that a Barnes Ice Cap core will be joining the others in the ice core vault at Antarctica’s Concordia Station, but it seems quite likely.

There are a variety of markers that are cited as the start of the Anthropocene, often the radionuclides from the Trinity test in 1945 being the first solid entry in the geological record. The lost of this last bit of the Laurentide will surely be an important milestone in the early centuries of this fearsome new age.

 

 

Advertisements

One thought on “Last Of The Laurentide

  1. Pingback: Atlantification & Other Horrors | Neal Rauhauser

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s