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Southwest Megadroughts Are Coming Back Because of Climate Change, Scientists Say
The Weather Channel ^ | 7/25/19 | Ron Brackett

Posted on 07/25/2019 7:12:05 AM PDT by null and void

By less than an hour agoweather.com

(Getty Image)

A dry landscape stands on Navajo Nation lands on June 7, 2019, in the town of Gallup, New Mexico. Rising temperatures associated with global warming have worsened drought conditions on their lands over recent decades leading to a worsening of water access.

At a Glance

• The U.S. Southwest experienced a dozen megadroughts from the years 800 to 1600.
• These droughts lasted for decades at a time.
• Researchers say they have discovered the cause of those droughts.
• Climate change could cause another megadrought soon, they say.
Scientists say they have pinpointed the cause of medieval megadroughts that stretched for decades at a time, and they warn climate change could soon cause them to return to the American Southwest.

From the 9th through the 16th centuries, the Southwest experienced about a dozen megadroughts. These extreme droughts were caused by a combination of three factors, according to a new study by researchers at Columbia University's Lamont-Doherty Earth Observatory.

Two of the factors were warming sea surface temperatures in the Atlantic Ocean and high radiative forcing, which occurs when the atmosphere traps more energy from the sun than it radiates back into space, according to the study published this week in Science Advances.

The third, and most important factor, was severe and frequent La Niña events, periods when tropical Pacific Ocean temperatures are cooler and storms are pushed toward the Northwest.

“Both a warm Atlantic and a cold Pacific change where storms go,” Nathan Steiger, the study's lead author, told Vice. “They both result in fewer storms going to the Southwest.”

(Ghetto Image)

Parched land stands along a dried river on Navajo Nation lands on June 7, 2019, near the town of Thoreau, New Mexico. Rising temperatures associated with global warming have worsened drought conditions on their lands over recent decades leading to a worsening of water access.

On top of having less rainfall because of fewer storms, the radiative forcing caused any moisture that was there to evaporate more quickly.

Beginning in 1600, volcanic eruptions that spewed particles into the atmosphere blocked some of the sun's energy and decreased the effect of radiative forcing, thereby greatly reducing the number of megadroughts.

However, the increased burning of fossil fuels that started with the Industrial Age pumped more carbon dioxide into the atmosphere, which is again trapping the sun's energy.

This makes the Southwest, parts of which have seen ongoing drought for years now, more vulnerable to megadroughts, according to the Earth Institute's State of the Planet blog.

“Because you increase the baseline aridity, in the future when you have a big La Niña, or several of them in a row, it could lead to megadroughts in the American West,” Steiger said.

Forecasting the effect of climate change on La Niña events remains tricky, the study says. The bigger worry may be "the possibility that radiative forcing could gradually come to dominate the hydroclimate of the Southwest, with the recurrence of megadroughts becoming almost assured."


TOPICS: Weather
KEYWORDS: drought; ohno
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To: null and void
Researchers say they have discovered the cause of those droughts.

It was caused by those horrible gas guzzling SUVs back in the year 800.

Same thing caused the 1930 Oklahoma dust bowl. Well, SUVs and central a/c.

41 posted on 07/25/2019 8:15:50 AM PDT by bgill
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To: null and void

Evidently global climate changes are not man created but cyclically result from other NATURAL causes. Shot themselves in the foot bigley


42 posted on 07/25/2019 8:16:06 AM PDT by Godzilla ( I just love the smell of COVFEFE in the morning . . . . .)
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To: null and void

Morons. Cannot even keep their own lies straight. Global warming must mean more El Nino’s according to the Climate Change morons. So that means more rain. West Texas is turning green baby.


43 posted on 07/25/2019 8:17:30 AM PDT by justa-hairyape (The user name is sarcastic. Although at times it may not appear that way.)
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To: null and void

Dear ‘scientists’

1. Define the “correct” temperature range for the planet.

2. Define the “correct” humidity range for the planet.

3. Define the “correct” mean sea level for the planet.

4. Define the “correct” amount of precipitation for the planet.

5. Define the “correct” makeup of the atmosphere.

6. Define the “correct” amount of sea ice at the N/S poles.

7. Define/explain past glaciation and subsequent warming without any input from humans.

Waiting patiently for your response.


44 posted on 07/25/2019 8:18:30 AM PDT by rktman ( #My2ndAmend! ----- Enlisted in the Navy in '67 to protect folks rights to strip my rights. WTH?)
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To: Tijeras_Slim

Just wait and see what happens if Jim Cantore shows up. :-)


45 posted on 07/25/2019 8:19:50 AM PDT by rktman ( #My2ndAmend! ----- Enlisted in the Navy in '67 to protect folks rights to strip my rights. WTH?)
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To: null and void

That sounds like the era that was called “The Medieval Warming Period,” when the Earth was four degrees warmer than now.


46 posted on 07/25/2019 8:26:20 AM PDT by july4thfreedomfoundation (President Trump IS The Resistance!)
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To: windsorknot

Pseudo Science is Fake Science by PHD’s.


47 posted on 07/25/2019 8:26:34 AM PDT by Grampa Dave ( Mueller was the only one who learned anything about his session w/congress. He forgot it quickly)
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To: null and void

They gave it away with the lede.
“Coming back” means climate change has occurred before.
No shi....er...no Obama, Sherlock.
Those cliff dwellings in Co are ample evidence of climate change, among countless other examples.

And, of course, when you read “Scientists say”, well, just turn away. How many scientists? Do all scientists say this, or just some. Does a majority saying it make it correct? (Check out the reactions to relativity theory way back when.)

Are they on govt grants which will disappear if they say something not “approved” by politicians who’d fail a third grade science test?
And on and on.
Thankfully, a good many folks out there have the common sense to regard this stuff as - liberal tripe.


48 posted on 07/25/2019 8:27:06 AM PDT by Da Coyote (eh)
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To: Grampa Dave

The tree ring specimen in Arizona from a Redwood shows many hundreds of years of wet and dry.

Climate variations always happening.


49 posted on 07/25/2019 8:43:43 AM PDT by amihow
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To: null and void

Yes, of course recurring droughts are because of climate change - just like the 1100 AD drought that moved the Anasazi out of their homes.

The climate is changing all the time. Why would now be any different?


50 posted on 07/25/2019 8:45:27 AM PDT by Jim Noble (I have never seen a dead horse get up, beat on or not)
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To: null and void

“Researchers say they have discovered the cause of those droughts.”

Oh, the indians were driving too many SUVs from 800-1600 AD?


51 posted on 07/25/2019 8:49:36 AM PDT by Boogieman
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To: null and void

Hey dip shit global warming bullshitter analysis loser

Here in California we are drought drought drought drought global warming global warming global warming we’re all going to die do them doom doom gloom glam glam!

G then what happened?

Wow Z’s in 2017 we had incredible rain in all of the reservoirs went from like 15% to 100% Far and the Oreville dam was threatening to fail because of so much water

Then an 18 we had sort of a normal winter and then in 19 we had incredible rain again

Member those mud slides in Santa Barbara? Southern Cal got 160% of their normal rain this winter

Salep if you have a reasonable all liberal global warming enthusiast just asking what causes Ice Ages ?

And furthermore how we get a stop the next one?


52 posted on 07/25/2019 9:18:03 AM PDT by Truthoverpower (The guvmint you get is the Trump winning express !)
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To: null and void

Hey dip shit global warming bullshitter analysis loser

Here in California we are drought drought drought drought global warming global warming global warming we’re all going to die do them doom doom gloom glam glam!

G then what happened?

Wow Z’s in 2017 we had incredible rain in all of the reservoirs went from like 15% to 100% Far and the Oreville dam was threatening to fail because of so much water

Then an 18 we had sort of a normal winter and then in 19 we had incredible rain again

Member those mud slides in Santa Barbara? Southern Cal got 160% of their normal rain this winter

Salep if you have a reasonable all liberal global warming enthusiast just asking what causes Ice Ages ?

And furthermore how we get a stop the next one?


53 posted on 07/25/2019 9:18:09 AM PDT by Truthoverpower (The guvmint you get is the Trump winning express !)
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To: Truthoverpower

Please don’t call me dip shit, nully suffices


54 posted on 07/25/2019 9:21:32 AM PDT by null and void (The Democratic Party is back to loving workers but hating employers. A winning formula I'm sure.)
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To: Truthoverpower

Please don’t call me dip shit, nully suffices


55 posted on 07/25/2019 9:21:47 AM PDT by null and void (The Democratic Party is back to loving workers but hating employers. A winning formula I'm sure.)
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To: Regulator

According to his bio, “came to Columbia University as a NOAA Climate and Global Change Postdoctoral Fellow”...IOW, he’s supposed to find things changing or lose his subsidy.


Government grants have ruined scientific research, especially that done by universities.

No university will tolerate their staff bluntly refusing a few million to continue a study.

Just check and see how much money Berkeley or NC State or any of the other big universities is receiving in government grants.

The university system is totally corrupt.


56 posted on 07/25/2019 10:00:51 AM PDT by old curmudgeon (There isTha no situation so terrible, so disgraceful, that the federal government can not make worse)
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To: PGR88

Well, this past year in southwest has been an unusually cold and wet year...you may already have won.


57 posted on 07/25/2019 10:04:37 AM PDT by Scott from the Left Coast (You may come to the moment when you will have to fight with all the odds against you...)
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To: null and void
Rising temperatures associated with global warming have worsened drought conditions on their lands over recent decades leading to a worsening of water access.

In a couple of years they will mimic this guy:


58 posted on 07/25/2019 1:08:09 PM PDT by Oatka
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To: amihow

Climate variations always happening.

They will continue to happen for the next thousand years.


59 posted on 07/25/2019 1:53:05 PM PDT by Grampa Dave ( Mueller was the only one who learned anything about his session w/congress. He forgot it quickly)
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To: Grampa Dave

Gen 8:22 While the earth remaineth, seedtime and harvest, and cold and heat, and summer and winter, and day and night shall not cease.

Climate change is not what we have to worry about. It’s the earth remaining.


60 posted on 07/25/2019 3:08:29 PM PDT by DannyTN
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