Tag: frost

Thawing Tundra Speeds Up Warming

  • University of Florida biologist Ted Schuur does field work in the Alaska tundra every summer (Photo courtesy of Ted Schuur)

A report in this week’s journal Nature looks at how thawing ground up North might
impact global warming. Amy Mayer spent some time in Interior Alaska with
scientists at Eight Mile Lake:

Transcript

A report in this week’s journal Nature looks at how thawing ground up North might
impact global warming. Amy Mayer spent some time in Interior Alaska with
scientists at Eight Mile Lake:

Permafrost is ground that’s supposed to be frozen all the time. But for decades it’s been
thawing in places.

When that happens, carbon gets released—potentially contributing to the greenhouse
effect.

Ted Schuur’s a biologist at the University of Florida but he spends his summers doing
experiments near Healy, Alaska.

I tagged along during some field visits.

I met Schuur when we were both living in Fairbanks. He lives far away now, but loves
Alaska. You only work here year after year if you do. Summer field work is brutal – tons
of mosquitoes and you work all the time because the sun doesn’t set.

Pretty soon, we’re there.

“This has to be one of my more photogenic field sites that I ever worked at.”

Tundra surrounds us. We’re just north of the Alaska Range. I can see the snow-capped
peaks. We change into rubber boots, pick up our packs, and, after a few steps, we’re on
the tussocks.

Alaskans often say walking on tussocks is like balancing on basketballs. It’s not easy. If
your feet slip off, they get wet. Schuur’s tall and used to this, so he goes faster than me,
and with less bumbling.

Soon, we’re balancing on lumber instead. Schuur and his group try to protect the areas
where they work with narrow boardwalks.

“When we first came out here, we put these boardwalks that we’re walking on now, big
10 feet pieces of lumber – they’re like 2x6s or 2x8s. But we don’t really want to walk on
the tundra because we come here a lot and you’d end up with a trail in no time and
destroy vegetation.”

Schuur knows trudging across the tundra damages it and he tries to minimize that harm.
But in order to answer his questions about the potential greenhouse effect from thawing
permafrost, he has to dig in.

Schuur saws into the tundra with a bread knife.

“It’s very satisfying. It’s like cutting a big cake – though this is a cake with lots of roots in it.”

He cuts up the plants and packs the roots and the tops into jars.

“We’re going to measure respiration of plants.”

Schuur uses a machine to scrub out the carbon from the air that’s in the jars. The plant
tops and roots will continue to respire carbon dioxide until they die. Later, he’ll use fancy
equipment to “date” the carbon that’s left.

He needs the age of the carbon because when he finds older carbon he knows it’s only
recently escaped the frozen ground. That makes it extra in the system.

At first, Schuur learned, new carbon coincides with more plant growth that uses up the
addition. That means no greenhouse effect.

But, later, the permafrost keeps thawing, more old carbon becomes available, and plant
growth just can’t keep up. That means, carbon dioxide ends up in the atmosphere from
the thawing permafrost – just like it does from burning coal or gasoline.

The thawing may ultimately be a bad thing, but to understand and explain it further,
Schuur wants to document it – or even cause some. Next, he says…

“As strange as it seems, I would love to thaw permafrost on a large scale,
experimentally.”

The dilemma, of course, is that causing a thaw means contributing to – in a small way –
a process that might damage or destroy the ecosystem. But we all emit carbon dioxide,
just by driving.

“Even as I do that and I do an experiment where I melt out a little bit of the permafrost, I
think we’re generating this information that’s helping society answer these huge
questions.”

Schuur says the amount of tundra he’d sacrifice is tiny relative to the whole circumpolar
region, where tons of carbon waits in ground that is frozen now but could eventually
thaw.

For The Environment Report, I’m Amy Mayer.

Related Links

Fruit Frostbite From Record Lows

Freezing temperatures recently descended on large sections of the country.
Record lows were registered from the south to the plains states. The
prolonged frost means entire crops of fruit and grain could be lost. Adam
Allington reports:

Transcript

Freezing temperatures recently descended on large sections of the country.
Record lows were registered from the South to the Plains states. The
prolonged frost means entire crops of fruit and grain could be lost. Adam
Allington reports:


Paul Peters has 500 acres of apples and peaches in central Missouri. Peters
says above average temperatures during the day and night advanced the
growing season by 2-3 weeks:


“We really didn’t cool down at night; I think probably was more of a concern then
reaching 60-70 degrees in the daytime. One of my partners here said he’d never seen an
apple blossom in March and this year he did.”


But then a week-long frost hit, right when crops were at their most
vulnerable.


Extensive damage has also been reported on crops of winter wheat, grapes
and cherries.


Some farmers will be able to till under failed wheat and alfalfa crops and
substitute corn. However, it may not be that simple since corn seed supplies
are already tight from higher than normal plantings for ethanol production.


For the Environment Report, I’m Adam Allington.

Related Links

Romancing the American Chestnut

  • The smaller American chestnuts on the left were a part of culture for people who lived in hardwood forested areas of the U.S. The Chinese chestnuts on the right are not susceptible to the blight.

Food is always a big part of the holidays. But
one traditional food has – for the most part – disappeared
from American tables. Lester Graham explains:

Transcript

Food is always a big part of the holidays. But one traditional food has – for the
most part – disappeared from American tables. Lester Graham reports:


(Sound of Nat King Cole singing, “Chestnuts roasting on an open fire…”)


That old chestnut of a song romanticizes roasting chestnuts as a part of the
holidays. But a lot of us have never even seen chestnuts, let alone roasted them
on an open fire. Chestnuts used to be a major part of the Eastern hardwood
forest. There were millions of them. In fact, 25 percent of all the mature trees
were chestnuts. But a blight, imported with some Chinese chestnut trees, slowly
wiped out the American chestnuts. Now, they’re gone.


Well… almost. Much of the root stock is still alive. Sprouts grow until the blight
knocks them back again. A blight only hurts the standing tree where it branches
out.


And, in a few isolated pockets in the Midwest, the blight hasn’t reached the trees.
A few American chestnuts are alive and growing and some of them are free of the
blight.


At Nash Nurseries in central Michigan, owner Bill Nash is guiding us through a
rare sight… a grove of American chestnuts.


“These are 20 years old and as you can see, they’re fairly good sized. The
American chestnut is quite a rapid growing tree. It’s well-suited for our climate,
so it doesn’t have any of the problems that some of the hybrids do as far as
growing and cultural care you have to take care of them. The Americans, you get
them started and they’re pretty much on their own.”


In a few places in Michigan and Wisconsin there are small groves of chestnuts.
They’re prized trees. They’re great for shade. The hardwood is rot resistant and
makes great furniture and fence posts. And the chestnuts are eaten by humans
and wildlife alike. Bill Nash says the tree will be popular again if it ever
overcomes the blight that’s hit it so hard.


“The American chestnut will make another big comeback in this country as a yard
tree, as a timber tree, as a wildlife tree.”


That part about a wildlife tree is more important than just worrying about the
squirrels and bunnies. Chestnuts were an important food source for all kinds of
animals.


Andrew Jarosz is a plant biologist at Michigan State University. He says the loss
of chestnuts has been hard on wildlife populations.


“Chestnuts shed nuts in a more regular pattern than oaks, which will have what
are called mast years – where they’ll have major crops, massive crops one year
and very small crops in other years – which means it’s either feast or famine if
you’re depending on oaks.”


Since the blight first began hitting American chestnuts about a century ago,
researchers have been looking into all kinds of ways to stop it. One way is to cross
it with the Chinese chestnut which has a couple of genes that resist the blight. But
it takes a long time to breed out the Chinese characteristics from the American
chestnuts and still keep the resistant genes.


Another approach is genetic manipulation. Genetically modifying the American
chestnut tree to make it disease resistant. Again, work is underway, but it takes a
long time. And even after success, it’s likely some people won’t like the idea of
releasing a genetically modified organism into the wild.


The final approach worked in Europe when the blight hit there. It seems there’s a
naturally occuring virus that kills the blight. It spread naturally in Europe. There
are a few groves in Michigan that have naturally acquired the virus and it’s
working to keep the blight at bay.


Andrew Jarosz is working on the research. He says the trick is figuring out how to
get the virus to spread to other trees short of manually spreading it on cankers
infected by the blight.


“If we’re literally talking about millions of trees across probably, you know, the
eastern third of the country, we obviously can’t treat every canker on every tree.
And we need to be able to figure out a way to deploy the virus in a way that it can
spread.”


Even with all that hopeful research, it’ll be ten years at least before some practical
solutions end up in the forests, and Jarosz believes a couple of centuries before
the American chestnut holds the place it once did in the forests.


Bill Nash knows it’ll be a while before there are major changes, but he is
optimistic about the American chestnut.


“Oh, I would think the tree has a bright future. There’s enough people working on
that, enough programs going on now. So, I would suspect that in the not-too-
distant future we should have some of this progress made. You know, Robert
Frost in his poem predicted the comeback of the American chestnut, that
something would arise to offset that blight. And we’re starting to see that.”


Frost put it this way: “Will the blight end the chestnut? The farmers rather guess
not, It keeps smoldering at the roots And sending up new shoots Till another
parasite Shall come to end the blight.”


Seems Frost was an optimist too.


For the Environment Report, this is Lester Graham.

Related Links

Is Our Water Too Clean?

Diseases caused by contaminated water are common in the developing world, but they’re also making a comeback in the United States where the water might be too clean. The Great Lakes Radio Consortium’s Charity Nebbe
explains:

Transcript

Diseases caused by contaminated water are common in the developing
world, but they’re also making a comeback in the United States where
the water might be too clean. The Great Lakes Radio Consortium’s
Charity Nebbe has more:


In 1993, the water-borne pathogen Cryptosporidium claimed 54 lives in
Milwaukee. Incidents of that magnitude are rare, but outbreaks of
water-borne pathogens are increasingly common.


Floyd Frost is an epidemiologist at Lovelace Respiratory Research
Institute in New Mexico and he believes the increase in disease is
linked to improvement in water purification technology. As evidence he
points to his research, published in The Journal of Infectious
Diseases, that shows lower incidence of disease in communities that
drink surface water…


“Perhaps the low dose exposures in surface water are immunizing
people so that they don’t get sick, whereas in the ground water it’s
relatively clean most of the time, but when contamination occurs people
get much sicker.”


Frost believes that to prevent future outbreaks water treatment
facilities need to focus on preventing plant failures rather than
improving purification.


For the GLRC, I’m Charity Nebbe.

Related Links

Romancing the American Chestnut

  • American chestnuts (left) are smaller than Chinese and European chestnuts. The Chinese and European varieties are also resistant to the blight, making the imports more desirable to growers. (Photo by Lester Graham)

Food is always a big part of the holidays. But one
traditional food has – for the most part – disappeared from American tables. The Great Lakes Radio Consortium’s Lester Graham reports:

Transcript

Food is always a big part of the holidays. But one traditional food has – for the most part – disapeared from American tables. The Great Lakes Radio Consortium’s Lester Graham reports:


(Sound of Nat King Cole singing, “Chestnuts roasing on an open fire…”)


That old chestnut of a song romanticizes roasting chestnuts as a part of the holidays. But a lot of us have never even seen chestnuts, let alone roasted them on an open fire. Chestnuts used to be a major part of the Eastern hardwood forest. There were millions of them. In fact, 25 percent of all the mature trees were chestnuts. But a blight, imported with some Chinese chestnut trees, slowly wiped out the American chestnuts. Now, they’re gone.


Well… almost. Much of the root stock is still alive. Sprouts grow until the blight knocks them back again. A blight only hurts the standing tree where it branches out.


And, in a few isolated pockets in the Midwest, the blight hasn’t reached the trees. A few American chestnuts are alive and growing and some of them are free of the blight. At Nash Nursuries in central Michigan, owner Bill Nash is guiding us through a rare sight… a grove of American chestnuts.


“These are 20 years old and as you can see, they’re fairly good sized. The American chestnut is quite a rapid growing tree. It’s well-suited for our climate, so it doesn’t have any of the problems that some of the hybrids do as far as growing and cultural care you have to take care of them. The Americans, you get them started and they’re pretty much on their own.”


In a few places in Michigan and Wisconsin there are small groves of chestnuts. They’re prized trees. They’re great for shade. The hardwood is rot resistant and makes great furniture and fence posts. And the chestnuts are eaten by humans and wildlife alike. Bill Nash says the tree will be popular again if it ever overcomes the blight that’s hit it so hard.


“The American chestnut will make another big comeback in this country as a yard tree, as a timber tree, as a wildlife tree.”


That part about a wildlife tree is more important than just worrying about the squirrels and bunnies. Chestnuts were an important food source for all kinds of animals.


Andrew Jarosz is a plant biologist at Michigan State University. He says the loss of chestnuts has been hard on wildlife populations.


“Chestnuts shed nuts in a more regular pattern than oaks, which will have what are called mast years – where they’ll have major crops, massive crops one year and very small crops in other years – which means it’s either feast or famine if you’re depending on oaks.”


Since the blight first began hitting American chestnuts about a century ago, researchers have been looking into all kinds of ways to stop it. One way is to cross it with the Chinese chestnut which has a couple of genes that resist the blight. But it takes a long time to breed out the Chinese characteristics from the American chestnuts and still keep the resistant genes.


Another approach is genetic manipulation. Genetically modifying the American chestnut tree to make it disease resistant. Again, work is underway, but it takes a long time. And even after success, it’s likely some people won’t like the idea of releasing a genetically modified organism into the wild.


The final approach worked in Europe when the blight hit there. It seems there’s a naturally occuring virus that kills the blight. It spread naturally in Europe. There are a few groves in Michigan that have naturally acquired the virus and it’s working to keep the blight at bay. Andrew Jarosz is working on the research. He says the trick is figuring out how to get the virus to spread to other trees short of manually spreading it on cankers infected by the blight.


“If we’re literally talking about millions of trees across probably, you know, the eastern third of the country, we obviously can’t treat every canker on every tree. And we need to be able to figure out a way to deploy the virus in a way that it can spread.”


Even with all that hopeful research, it’ll be ten years at least before some practical solutions end up in the forests, and Jarosz believes a couple of centuries before the American chestnut holds the place it once did in the forests.


Bill Nash knows it’ll be a while before there are major changes, but he is optimistic about the American chestnut.


“Oh, I would think the tree has a bright future. There’s enough people working on that, enough programs going on now… So, I would suspect that in the not-too-distant future we should have some of this progress made. You know, Robert Frost in his poem predicted the comeback of the American chestnut, that something would arise to offset that blight. And we’re starting to see that.”


Frost put it this way: “Will the blight end the chestnut? The farmers rather guess not, It keeps smoldering at the roots And sending up new shoots Till another parasite Shall come to end the blight.”


Seems Frost was an optimist too.


For the Great Lakes Radio Consortium, this is Lester Graham.

Related Links

Epa to Regulate Airplane De-Icing Fluid?

The Environmental Protection Agency says it might impose new restrictions on airports. Officials with the EPA say de-icing chemicals used on planes and taxiways can contaminate surface water. The Great Lakes Radio Consortium’s Celeste Headlee reports:

Transcript

The Environmental Protection Agency says it might impose new restrictions on airports.
Officials with the EPA say de-icing chemicals used on planes and taxiways can
contaminate surface water. The Great Lakes Radio Consortium’s Celeste Headlee
reports:


Many airlines spray ethylene glycol on planes to melt ice and frost. The EPA says that
chemical can endanger wildlife when it enters nearby water bodies. The agency
estimates that 21 million gallons of de-icing fluid are discharged from airports every year.


The EPA plans to study de-icing chemicals to determine whether any restrictions are
necessary. Claudio Ternieden of the American Association of Airport Executives
acknowledges de-icing chemicals may have an environmental impact, but says the issue
is not as simple as it seems.


“I think it’s important to remember, this is a safety-based industry and what we’re trying
to do is make sure folks are flying safely. That’s the primary goal of our industry.”


Many airports already use strict treatment or recycling programs for de-icing fluid. Last
winter, the Detroit Metro Airport recycled about 850 thousand gallons of the fluid, more
than any other airport in the world.


The EPA predicts it will complete its study of de-icing chemicals in three years.


For the Great Lakes Radio Consortium, I’m Celeste Headlee.

Related Links