Skip to comments.Cave reveals Southwest's abrupt climate swings during Ice Age
Posted on 01/20/2010 2:11:19 PM PST by decimon
Ice Age climate records from an Arizona stalagmite link the Southwest's winter precipitation to temperatures in the North Atlantic, according to new research.
The finding is the first to document that the abrupt changes in Ice Age climate known from Greenland also occurred in the southwestern U.S., said co-author Julia E. Cole of the University of Arizona in Tucson.
"It's a new picture of the climate in the Southwest during the last Ice Age," said Cole, a UA professor of geosciences. "When it was cold in Greenland, it was wet here, and when it was warm in Greenland, it was dry here."
The researchers tapped into the natural climate archives recorded in a stalagmite from a limestone cave in southern Arizona. Stalagmites grow up from cave floors.
The stalagmite yielded an almost continuous, century-by-century climate record spanning 55,000 to 11,000 years ago. During that time ice sheets covered much of North America, and the Southwest was cooler and wetter than it is now.
Cole and her colleagues found the Southwest flip-flopped between wet and dry periods during the period studied.
Each climate regime lasted from a few hundred years to more than one thousand years, she said. In many cases, the transition from wet to dry or vice versa took less than 200 years.
"These changes are part of a global pattern of abrupt changes that were first documented in Greenland ice cores," she said. "No one had documented those changes in the Southwest before."
Scientists suggest that changes in the northern Atlantic Ocean's circulation drove the changes in Greenland's Ice Age climate, Cole said. "Those changes resulted in atmospheric changes that pushed around the Southwest's climate."
She added that observations from the 20th and 21st centuries link modern-day alterations in the North Atlantic's temperature with changes in the storm track that controls the Southwest's winter precipitation.
"Also, changes in the storm track are the kinds of changes we expect to see in a warming world," she said. "When you warm the North Atlantic, you move the storm track north."
The team's paper, "Moisture Variability in the Southwestern U.S. Linked to Abrupt Glacial Climate Change," is scheduled for publication in the February issue of Nature Geoscience. Cole's UA co-authors are Jennifer D. M. Wagner, J. Warren Beck, P. Jonathan Patchett and Heidi R. Barnett. Co-author Gideon M. Henderson is from the University of Oxford, U.K.
Cole became interested in studying cave formations as natural climate archives about 10 years ago. At the suggestion of some local cave specialists, she and her students began working in the Cave of the Bells, an active limestone cave in the Santa Rita Mountains.
In such a cave, mineral-rich water percolates through the soil into the cave below and onto its floor. As the water loses carbon dioxide, the mineral known as calcium carbonate is left behind. As the calcium carbonate accumulates in the same spot on the cave floor over thousands of years, it forms a stalagmite.
The researchers chose the particular stalagmite for study because it was deep enough in the cave that the humidity was always high, an important condition for preservation of climate records, Cole said. Following established cave conservation protocols, the researchers removed the formation, which was less than 18 inches tall.
For laboratory analyses, first author Wagner took a core about one inch in diameter from the center of the stalagmite. The scientists then returned the formation to the cave, glued it back into its previous location with special epoxy and capped it with a limestone plug.
To read the climate record preserved in the stalagmite, Wagner sliced the core lengthwise several times for several different analyses.
On one slice, she shaved more than 1,200 hair-thin, 100-micron samples and measured what types of oxygen molecule each one contained.
A rare form of oxygen, oxygen-18, is more common in the calcium carbonate deposited during dry years. By seeing how much oxygen-18 was present in each layer, the scientists could reconstruct the region's pattern of wet and dry climate.
To assign dates to each wet and dry period, Wagner used another slice of the core for an analysis called uranium-thorium dating.
The radioactive element uranium is present in minute amounts in the water dripping onto a stalagmite. The uranium then becomes part of the formation. Uranium decays into the element thorium at a steady and known rate, so its decay rate can be used to construct a timeline of a stalagmite's growth.
By matching the stalagmite's growth timeline with the sequence of wet and dry periods revealed by the oxygen analyses, the researchers could tell in century-by-century detail when the Southwest was wet and when it was dry.
"This work shows the promise of caves to providing climate records for the Southwest. It's a new kind of climate record for this region," Cole said.
She and her colleagues are now expanding their efforts by sampling other cave formations in the region.
The National Science Foundation, the Geological Society of America and the University of Arizona's Faculty Small Grant program funded the research.
Researcher contact: Julia Cole, 520-626-2341 email@example.com
Related Web site: http://www.geo.arizona.edu/ClimateChange/
Thuling Arizona ping.
They had SUVs during the Ice Age, who knew?
Are there any pictures of the SUVs that caused the ice age carved on those walls? Or how much CO2 was being released by the gas engined vehicles back then? What? It happened without SUVs and gas engines? Maybe todays change has nothing to do with SUVs and gas engines.
Is it cold in Greenland per chance right now? We are expecting up to five inches of rain by sunday.
THat is a huge amount of rain for this area. We generally only get about 8 or so inches a year.
I'd be surprised if they meant short-term temperatures. But maybe it works with what we call weather as well. Don't know if Greenland was actually colder during the last ice age.
This is Arizona. Let's hope McCain doesn't.
All solar, all the time.
>>The radioactive element uranium is present in minute amounts in the water dripping onto a stalagmite. The uranium then becomes part of the formation. Uranium decays into the element thorium at a steady and known rate, so its decay rate can be used to construct a timeline of a stalagmite’s growth.
By matching the stalagmite’s growth timeline with the sequence of wet and dry periods revealed by the oxygen analyses, the researchers could tell in century-by-century detail when the Southwest was wet and when it was dry. <<
One of the things that amazes me about this and so many other interesting and complex puzzles is that God even put clocks in the evidence that we could use to better interpret it. It’s like getting a “brain teaser” game for your kids.
Anbd imagine him putting the sun in the middle...because it has a special job...
We should be humbled by all this....but man is so arrogant. Let me introduce you to the man that can control God...Al Gore!!
Sounds like a good book title: "The Man Who Controlled God".
I’ve heard the planets are also there as a “junk filter”. They become “large object” magnets that keep stuff from hitting us. Not to mention all the “gravity” stuff going on.
It’s actually quite fascinating just how intertwined everything is and how many subtle parts, if removed, would take away our planet’s ability to sustain life as we know it.
I remember teaching my little grandson(6 at the time) about gravity.
After my very serious lecture....he looked at me....grabbed the globe off the table...and said...."Are you telling me that we're standing on this??"
I laughed and said "You got it!!" Super, smart kid!!
Thanks decimon.I like that closing sentence -- "future decision-making could be made based on scientific data and not on political expediency". I wouldn't count on it, but that would be great.Caves reveal clues to UK weatherAt Pooles Cavern in Derbyshire, it was discovered that the stalagmites grow faster in the winter months when it rains more. Alan Walker, who guides visitors through the caves, says the changes in rainfall are recorded in the stalactites and stalagmites like the growth rings in trees. Stalagmites from a number of caves have now been analysed by Dr Andy Baker at Newcastle University. After splitting and polishing the rock, he can measure its growth precisely and has built up a precipitation history going back thousands of years. His study suggests this autumn's rainfall is not at all unusual when looked at over such a timescale but is well within historic variations. He believes politicians find it expedient to blame a man-made change in our weather rather than addressing the complex scientific picture.
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Anyone know where to find a graph of the variations measured in the two studies?
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