Message Font: Serif | Sans-Serif
 
UnThreaded | Threaded | Whole Thread (2) | Ignore Thread Prev | Next
Author: AstroPhool Three stars, 500 posts Old School Fool Add to my Favorite Fools Ignore this person (you won't see their posts anymore) Number: of 56172  
Subject: Re: Retreating Glacier Reveals Ancient Forests Date: 9/22/2013 1:49 PM
Post New | Post Reply | Reply Later | Create Poll . Report this Post | Recommend it!
Recommendations: 3
The Mendenhall Glacier’s recession is unveiling the remains of ancient forests that have remained frozen beneath the ice for up to 2,350 years. UAS Professor of Geology and Environmental Science Program Coordinator Cathy Connor said she and others have been tracking the emergence of the forests’ remains...

As the glacier advanced, it snapped off the tops of the trees in its path, Connor said. The stumps were buried — and protected — in gravel. Now, as the glacier melts, the melt water carves out paths in that gravel, revealing the remains of the trees.

The most recent stumps she’s dated emerging from the Mendenhall are between 1,400 and 1,200 years old. The oldest she’s tested are around 2,350 years old. She’s also dated some at around 1,870 to 2,000 years old.

Ajax: And keep in mind that both warm periods took place without the presence of CO2.


Despite the name of your source Not A Lot Of People Know That, it turns out that quite a few people did know that. It has been well known for years that there has been a gradually cooling over the past few thousand years.

The Marcott et al (2013) temperature reconstruction of the past 11000 years, courtesy of RealClimate, shows this long-term trend well:

http://www.realclimate.org/images//shakun_marcott_hadcrut4_a...

That paper also shows the source: a strong decline in orbital forcings, particularly from solar insolation at high latitudes during northern summer:

http://www.realclimate.org/images//marcott_fig_2.png

We don't need changes in CO2 to explain this. As has been said on this board over and over and over again, there are forcings other than CO2 that affect the climate. It's just that the rapid increase in atmospheric CO2 in recent decades completely dominates those changes today.

Phil
Post New | Post Reply | Reply Later | Create Poll . Report this Post | Recommend it!
Print the post  
UnThreaded | Threaded | Whole Thread (2) | Ignore Thread Prev | Next

Announcements

Pencils of Promise - Back to School Drive
"Pencils of Promise works with communities across the globe to build schools and create programs that provide education opportunities for children."
Managing Your Wealth
Our own TMFHockeypop from Rule Your Retirement fame on the TV show Managing Your Wealth.
When Life Gives You Lemons
We all have had hardships and made poor decisions. The important thing is how we respond and grow. Read the story of a Fool who started from nothing, and looks to gain everything.
What was Your Dumbest Investment?
Share it with us -- and learn from others' stories of flubs.
Community Home
Speak Your Mind, Start Your Blog, Rate Your Stocks

Community Team Fools - who are those TMF's?
Contact Us
Contact Customer Service and other Fool departments here.
Work for Fools?
Winner of the Washingtonian great places to work, and "#1 Media Company to Work For" (BusinessInsider 2011)! Have access to all of TMF's online and email products for FREE, and be paid for your contributions to TMF! Click the link and start your Fool career.
Advertisement