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UA scientists find evidence of Roman period megadrought (in US, not Rome)
University of Arizona ^ | November 4, 2011

Posted on 11/04/2011 4:02:52 PM PDT by decimon

A new study at the University of Arizona's Laboratory of Tree-Ring Research has revealed a previously unknown multi-decade drought period in the second century A.D.

Almost nine hundred years ago, in the mid-12th century, the southwestern U.S. was in the middle of a multi-decade megadrought. It was the most recent extended period of severe drought known for this region. But it was not the first.

The second century A.D. saw an extended dry period of more than 100 years characterized by a multi-decade drought lasting nearly 50 years, says a new study from scientists at the University of Arizona.

UA geoscientists Cody Routson, Connie Woodhouse and Jonathan Overpeck conducted a study of the southern San Juan Mountains in south-central Colorado. The region serves as a primary drainage site for the Rio Grande and San Juan rivers.

"These mountains are very important for both the San Juan River and the Rio Grande River," said Routson, a doctoral candidate in the environmental studies laboratory of the UA's department of geosciences and the primary author of the study, which is upcoming in Geophysical Research Letters.

The San Juan River is a tributary for the Colorado River, meaning any climate changes that affect the San Juan drainage also likely would affect the Colorado River and its watershed. Said Routson: "We wanted to develop as long a record as possible for that region."

Dendrochronology is a precise science of using annual growth rings of trees to understand climate in the past. Because trees add a normally clearly defined growth ring around their trunk each year, counting the rings backwards from a tree's bark allows scientists to determine not only the age of the tree, but which years were good for growth and which years were more difficult.

(Excerpt) Read more at eurekalert.org ...


TOPICS: History
KEYWORDS: arizona; climatechange; dendrochronology; globalwarming; godsgravesglyphs; romanempire; treerings

1 posted on 11/04/2011 4:02:55 PM PDT by decimon
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To: SunkenCiv

Extra dry ping.


2 posted on 11/04/2011 4:03:32 PM PDT by decimon
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To: decimon

global warming no doubt.

those toyotas, priuses, buicks, ... destroy the environment.


3 posted on 11/04/2011 4:04:27 PM PDT by ken21
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To: decimon

Aztec SUVs are the cause.


4 posted on 11/04/2011 4:04:48 PM PDT by samtheman
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To: steelyourfaith

Oh Knows, Global Warming from us today affected the Roman Empire 2000 years ago... It went through a time warp or something...:)


5 posted on 11/04/2011 4:14:50 PM PDT by Thunder90 (Fighting for truth and the American way... http://citizensfortruthandtheamericanway.blogspot.com/)
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To: decimon
Thank goodness we grow all our food in China now.

No worries. ☺

6 posted on 11/04/2011 4:16:44 PM PDT by mylife (The Roar Of The Masses Could Be Farts)
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To: mylife

Ain’t no century got MORE THAN A HUNERT YEARS!


7 posted on 11/04/2011 4:23:33 PM PDT by muawiyah
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To: Thunder90

Ah ,the Romans , it was those open toe sandals and all that concrete


8 posted on 11/04/2011 4:23:33 PM PDT by molson209
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To: Thunder90; Nervous Tick; SteamShovel; Tunehead54; golux; tubebender; Fractal Trader; ...
*chortle*

Thanx for the ping Thunder90 !

 


Beam me to Planet Gore !

9 posted on 11/04/2011 4:25:11 PM PDT by steelyourfaith (If it's "green" ... it's crap !!!)
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To: decimon
" in the second century A.D. Almost nine hundred years ago, in the mid-12th century, "

Huh?

10 posted on 11/04/2011 4:25:43 PM PDT by I am Richard Brandon
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Looking For Donors


Click The Pic

Are You One?

11 posted on 11/04/2011 4:31:53 PM PDT by DJ MacWoW (America! The wolves are here! What will you do?)
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To: muawiyah

True enuff!


12 posted on 11/04/2011 4:32:54 PM PDT by mylife (The Roar Of The Masses Could Be Farts)
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To: decimon; StayAt HomeMother; Ernest_at_the_Beach; 1010RD; 21twelve; 24Karet; 2ndDivisionVet; ...

 GGG managers are SunkenCiv, StayAt HomeMother & Ernest_at_the_Beach
Thanks decimon.

To all -- please ping me to other topics which are appropriate for the GGG list.


13 posted on 11/04/2011 5:23:58 PM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: I am Richard Brandon; decimon; SunkenCiv
" in the second century A.D. Almost nine hundred years ago, in the mid-12th century, "

Huh?

They are using the interstitial dendritic chronological catalysm of neuronic development that defines the difference between critical thinking and being criticized for your thinking...

14 posted on 11/04/2011 5:36:47 PM PDT by bigheadfred (wogga wogga)
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To: decimon

Isn’t that about the Anasazi left their pueblos?


15 posted on 11/04/2011 5:54:03 PM PDT by SuzyQue
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To: decimon; SunkenCiv; bigheadfred

Previous megadroughts in America: 2nd Century +/-; 12th Century +/-.

21st Century Time Magazine cover:

IS AMERICA HEADED INTO A MEGADROUGHT CRISIS?

Ten things YOU can do NOW to prepare!

Related stories:

President Appoints Water Czar pg 13
The Health Benefits of Dust Baths pg 37
How To Choose & Install a Flushless Toilet pg 42
You May Not Get Blood From a Turnip, But They DO Contain Precious Water pg 52
Learning From Our Pets: How to Use Your Tongue for Personal Grooming pg 69


16 posted on 11/04/2011 6:04:53 PM PDT by ApplegateRanch ("Public service" does NOT mean servicing the people, like a bull among heifers.)
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To: decimon

These are the same guys that claim they can tell the temperature long years ago from tree ring widths. Now they say they can tell how much rainfall there was too. Which is it?


17 posted on 11/04/2011 6:41:54 PM PDT by ccmay (Too much Law; not enough Order.)
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To: ccmay
These are the same guys that claim they can tell the temperature long years ago from tree ring widths. Now they say they can tell how much rainfall there was too. Which is it?

These guys are a regular tree ring circus.

18 posted on 11/04/2011 6:46:10 PM PDT by fhayek
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To: Thunder90

The Bush/Rove weather machine is an amazing thing isn’t it?


19 posted on 11/04/2011 8:32:16 PM PDT by Free Vulcan (Vote Republican! You can vote Democrat when you're dead.)
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To: ccmay

both


20 posted on 11/05/2011 5:10:05 AM PDT by bert (K.E. N.P. +12 ..... Crucifixion is coming)
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To: decimon; SunkenCiv

Irritates me to no end when I see warming and drought linked together. Warm air holds moisture, cold air cannot. The drought was most likely linked to a cold spell, not a warm one. What is interesting is that this is the time that Rome started to go through troubles with plague, invasion and crop-failure. The cooling / drought could have been global.


21 posted on 11/07/2011 2:53:20 PM PST by fatez ("If you're going through Hell, keep going." Winston Churchill)
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