Loss of Arctic sea ice stokes summer heat waves in southern U.S.

Loss of Arctic sea ice stokes summer heat waves in southern U.S.
Composites of summer extreme (left panels) and oppressive heat wave (right panels) frequency during summers of low (top), neutral (middle) and high (bottom) Hudson Bay sea ice extent. Credit: AGU

Over the last 40 years, Arctic sea ice thickness, extent and volume have declined dramatically. Now, a new study finds a link between declining sea ice coverage in parts of the Canadian Arctic and an increasing incidence of summer heat waves across the southern United States.

The new study in AGU's Journal of Geophysical Research: Atmospheres explores how seasonal fluctuations of trigger changes in atmospheric circulation patterns during the boreal .

The study draws upon four decades of satellite data of Arctic sea ice coverage collected between 1979 and 2016, overlapped with wave frequency data across the United States during the same time period.

The team found evidence for a strong statistical relationship between the extent of summer sea ice in the Hudson Bay and across the southern Plains and southeastern U.S.

"The latest research on this topic suggests that declining Arctic sea ice may be linked to increased incidence of extreme weather patterns across the northern hemisphere," said Dagmar Budikova, a climatologist at Illinois State University in Normal and lead author of the new study. "Our results confirm this hypothesis by offering further evidence that Arctic sea ice variability has the potential to influence extreme summer temperatures and the frequency of heat waves across the southern U.S."

A better understanding of the physical relationships may allow scientists to forecast heat wave-prone summers, Budikova said.

"If Arctic sea ice continues to decline as predicted, then we could expect more summer heat waves across the southern U.S. in the future," she said.

Warm Arctic spring, hot southern summer

The new study finds the loss of sea ice across the Arctic begins with warmer-than-usual spring temperatures in the Hudson Bay and Labrador regions in the southeastern Canadian Arctic.

"This process starts when temperatures across the southeastern Canadian Arctic and northwestern Atlantic are 2 degrees [Celsius] warmer than expected in March, April and May," Budikova said.

This springtime warming lessens the north-to-south change in temperature between the high and middle latitudes of eastern North America, leading to a reduction in the strength of regional wind patterns. These conditions are symptomatic of weakened large-scale movements of air that appear to persist into the summer months, Budikova said.

The weakened circulation typically leads to increased undulation in the jet stream and the formation of persistent high-pressure systems over the southern U.S. The presence of high-pressure systems, also known as an atmospheric block, ultimately promotes unseasonable surface and atmospheric warming, and increased heat wave incidence.

Heat waves can last for days or weeks as high-pressure zones inhibit wind, clouds and other weather systems from entering the area.

"Local humidity, , and precipitation conditions are shown to influence the 'flavor' of the heat waves, which are more likely to be oppressive in the southeastern U.S. and extreme across the southern Plains during summers experiencing low Hudson [sea ice extent]," Budikova and colleagues wrote in the new study.

The next step will be to use dynamic modeling to confirm the statistical relationships between Arctic sea ice coverage and summer heat waves, and explore in detail the physical and dynamic atmospheric processes that make such linkages possible.

"General circulation models would further elucidate the processes that are taking place in the atmosphere to drive these connections," Budikova said.


Explore further

More persistent weather patterns in US linked to Arctic warming

More information: Dagmar Budikova et al. United States Heat Wave Frequency and Arctic Ocean Marginal Sea Ice Variability, Journal of Geophysical Research: Atmospheres (2019). DOI: 10.1029/2018JD029365

This story is republished courtesy of AGU Blogs (http://blogs.agu.org), a community of Earth and space science blogs, hosted by the American Geophysical Union. Read the original story here.

Citation: Loss of Arctic sea ice stokes summer heat waves in southern U.S. (2019, June 4) retrieved 21 August 2019 from https://phys.org/news/2019-06-loss-arctic-sea-ice-stokes.html
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Jun 04, 2019
Loss of Arctic sea ice stokes summer heat waves in southern U.S.


sure it does. Tell me oh sages when it was warm enough that Northern Europe still grew grapes for wine (prior to 1300 CE and still too chilly today), just how miserably hot were the natives in the southern US during the Roman and Medieval Climate Optimums? During Holocene Climate Optimum (6C warmer than today)?

Jun 04, 2019
And again shootist repeats the lie that Northern Europe grew grapes for wine to a greater degree in the past than now. The exact opposite is true - wine grapes are now grown in parts of Northern Europe where they never could be grown before, in quantity.

Jun 04, 2019
yep, that's shootownfoot yapping ignorance again.

poor dullard cant understand that local weather is a product of unnatural anthropogreedy adding devestation to natural global climate changes.

Jun 04, 2019
The Holocene Climate Optimum warm event consisted of increases of up to 4 °C near the North Pole (in one study, winter warming of 3 to 9 °C and summer of 2 to 6 °C in northern central Siberia).[1] Northwestern Europe experienced warming, but there was cooling in Southern Europe.[2] The average temperature change appears to have declined rapidly with latitude and so essentially no change in mean temperature is reported at low and middle latitudes
The climatic event was probably a result of predictable changes in the Earth's orbit (Milankovitch cycles) and a continuation of changes that caused the end of the last glacial period
https://en.wikipedia.org/wiki/Holocene_climatic_optimum

What do you say caused the warming of the Holocene optimum Shootist? What is your informed opinion?

Jun 04, 2019
Incidences of summer heating, but no incidences of Miami going underwater? Ugh.

Jun 04, 2019
More deceitful bullshite from the AGW Cult.
https://www.epa.g...eratures

Jun 04, 2019
I posted a comment for green onions in the article about the heat wave in India. I wonder if green onions will read it and answer my query regarding what he wants.

Jun 04, 2019
I wonder if green onions will read it and answer my query regarding what he wants
I did SEU - but I don't think you care what any one else wants.

Jun 05, 2019
The poles continue to warm since the last ice age. But temperature at the Equator doesn't be come deadly. The poles warm up like the rest of the planet is warmed.

It was 15 degress C warmer through much of Earth's history with much life. To say this fact is irrelevant, labels you as one not to ever be believed.

Jun 06, 2019
To say this fact is irrelevant, labels you as one not to ever be believed
Then don't believe me. So what? The fact is that you cannot understand a very simple point - which is that we know the temperature history of the earth - because the community of scientists who study the earth have revealed that to us. You did not do this. This same community of scientists know that for the past 800,000 years or so - the earth has been in an interesting state of balance - https://www.ncdc....e-change The fact is that the earth is currently in a warming trend - which is anomalous to this state of balance - caused by green house gas emissions - and causing the scientists who did all this work - to be concerned about little issues like possible runaway warming. So bringing up the same point (it's been warmer in the past) - when we tell you over and over and over that we know that - makes you an ignorant troll. Happy to point that out.

Jun 06, 2019
sure it does. Tell me oh sages when it was warm enough that Northern Europe still grew grapes for wine (prior to 1300 CE and still too chilly today), just how miserably hot were the natives in the southern US during the Roman and Medieval Climate Optimums? During Holocene Climate Optimum (6C warmer than today)?

I would like too see sources. My source says it was a lot chillier in the 13th century: https://3c1703fe8...nnor.jpg

Here in Finland I started growing grapes 3 years ago. Their not doing too great but maybe in few years if it gets warmer.

Jun 06, 2019
well cortezz, you are doing better than I did, many years ago trying to grow grapes in Arizona.
However, I was pretty ignorant of the subject at the time.

Years of reading up on the importance of terrior.
Made me realize my most likely mistakes

I should have tried NA native Wild Concords root-stock.
Though finding shaded hillside was unlikely.
That is a fierce, sun-blasted dry country.

If you know the specific biome where your grape-stock thrives?
You should attempt to acquire some of the soil, wet with living micro-organisms.
Deeply inserted into the soil around your grape plant's roots.
Late in the Spring or early summer, when the soil has a chance to warm up.
In cold weather maybe, black ground-cloth could help keeping the roots & micro-bugs from freezing.
Though it may help to rejuvenate every year with fresh infusion?

I heard a rumor of a guy who wanted a specific worm for fishing. He snuggled them in as muddy feet in boots.
Where Customs didn't bother to search.


Jun 06, 2019
well snoo, since there is only, this one singularly possible answer to complex climate systems?
it is kind of you to provide us that lone, unsubstantiated link of anti-AGW tripe to the never-bad, always magically perfect weather of fairyland?

just to fill my curiosity snoo. what exact summary punisjments will you demand of all the rest of the scientists & meteorologists who consider your denialist delusions as utter steershit?

& what penalties will you inflict on everyone else who betrays you by going outside & looking up into the sky?

Cause only those too stupid to lift their heads & open their eyes will obey your dictates.

Jun 06, 2019
snoosebaum -
nope


Greenonions -
yep
http://psc.apl.uw...V2.1.png

Good cherry picking though snoose.

Regarding Snoose's source -
Overall, this a quackery level pseudoscience website that has zero credibility
- https://mediabias...ucation/


Jun 06, 2019
snoose
take your pick

From your article snoose
This year's maximum of 22,490 km3 is the third lowest on record, 116 and 1,708 km3 behind 2018 and 2017 respectively (yes, the three lowest maximums on record have all occurred in the last three years)


Thanks snoose. I pick the 39 year trend - cuz I understand the concept of climate - https://neven1.ty...e200c-pi

Jun 07, 2019
thanks go, for the info source you supplied.

If tou have anymore links that expose anti-science fakirs & quacks?

Please post at your convenience.

honestly. i'm just too lazy to look for them.

Jun 07, 2019
greeny

funny how all the GW 'r stuff is 'anomaly' ,

Jun 07, 2019
funny how all the GW 'r stuff is 'anomaly'
So humans mining coal, oil, gas, and burning it is not an anomaly? C02 levels higher than they have been in 800,000 years - that's not anomalous? https://www.wefor...00-years Why don't you look at the actual data - not your denier bullshit cherry picked data - and see that sea ice is declining. So what's your point snoose? So Snoose - is the earth warming? What's the driver of that warming? Is that anomalous - or were the dinosaurs mining oil 150 million years ago? Again snoose - what's your point?

Jun 07, 2019
So humans mining coal, oil, gas, and burning it is not an anomaly? '''

co2 was once life , release it and the earth will make it live again !

Jun 07, 2019
co2 was once life , release it and the earth will make it live again !
Which of course misses the whole point. It is an anomaly that humans are mining all that carbon - and then burning it into our atmosphere. It is amazing how you can keep making stupid statements. Keep getting totally owned (like in making some stupid statement about anomalies) - and then going right ahead with the next stupid statement.


Jun 07, 2019
jeebus snoo, even for you that was a particularly stupid comment.

how about a single glass of water, applied now & again throughout the day, to refresh yourself?

That same water, compounded by additional tonnage?
Precipitously dumped precisely on your slack-jawed visage?

Not so refreshing.

nope. no sirree!

Have you been smart enough to have been faithfully paying the premiums for your house flood insurance?

why?

after all snoo, you live in cloud cuckooland. where you are kept safely cocooned from all possible misfortune.


Jun 07, 2019
@willsnazi

watch the greenhouse theory melt in front of u

https://www.youtu...n283fYbc

Jun 08, 2019
sorry snoo but i have bo interest in denierporn.
badly photoshoped piepans in your 'proof' of flying saucers?
has no appeal either.

run along now snoo.
you are overdue at the coven of your antivaxxer cult.

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