Winnipeg Free Press (Newspaper) - February 15, 2014, Winnipeg, Manitoba
C M Y K PAGE A21
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winnipegfreepress. com WORLD WINNIPEG FREE PRESS, SATURDAY, FEBRUARY 15, 2014 A 21
C HEBOYGAN, Mich. -
From the bridge of the
Coast Guard cutter
Mackinaw, northern
Lake Huron looks like a vast,
snow- covered field dotted
with ice slabs as big as boulders
- a battleground for the
icebreaker's 58- member crew
during one of the roughest
winters in memory.
It's been so bitterly cold for so long
in the Upper Midwest the Great Lakes
are almost completely covered with
ice. The last time they came this close
was in 1994, when 94 per cent of the
lakes' surface was frozen.
As of Friday, ice cover extended
across 88 per cent, according to the
U. S. federal government's Great Lakes
Environmental Research Laboratory
in Ann Arbor, Mich.
Sections of the lakes, which hold
nearly one- fifth of the freshwater on
the world's surface, harden almost
every winter. That freezing keeps the
Coast Guard's fleet of nine icebreakers
busy clearing paths for vessels
hauling essential cargo such as heating
oil, salt and coal. But over the past
four decades, the average ice cover
has receded 70 per cent, scientists say,
probably in part because of climate
change.
Still, as this season shows, shortterm
weather patterns can trump
multi- year trends. Winter arrived early
and with a vengeance and refuses to
loosen its grip.
" That arctic vortex came down and
the ice just kept going," said George
Leshkevich, a physical scientist with
the federal lab.
The deep- freeze is more than a
novelty. By limiting evaporation, it
may help replenish lake- water levels -
a process that began last year after a
record- breaking slump dating back to
the late 1990s. Also getting relief are
cities along the lakes that have been
pummelled with lake- effect snow,
which happens when cold air masses
suck up moisture from open waters
and dump it over land.
Buffalo, N. Y, got more than 109
centimetres of snow in January, but
this month just 33 cm have fallen, a
decline resulting largely from the
freeze- over of Lake Erie even though
Lake Ontario has remained largely
open, said forecaster Jon Hitchcock of
the National Weather Service.
Heavy ice can also protect fish eggs
from predators, and it has delighted
photographers, ice anglers and daredevil
snowmobilers.
At Apostle Islands National Lakeshore
in Wisconsin, the rock- solid
cover has allowed around 35,000
visitors to trudge kilometres over Lake
Superior to explore caves featuring
dazzling ice formations. It's the first
time in five years the lake surface has
been firm enough to allow passage.
With no let- up in the cold, the ice
hasn't experienced the usual thawand-
freeze cycle, so nature's artistry
is even more delicate and beautiful,
with needle- like hoarfrost crystals
sprinkled across sheets that dangle
from cave ceilings like giant
chandeliers.
" Seeing them like this is
almost a once- in- a- lifetime
experience,"
superintendent
Bob Krumenaker
said.
There's even
an ( apparently)
tongue- in- cheek Facebook page
inviting people to join a convoy of
snowmobiles, cars and other vehicles
on a nearly 129- km trek across Lake
Michigan. Never mind its waters remain
partly open and experts warn the
ice can be dangerously unstable.
" If it freezes, and you miss this
chance, when will it happen again?"
the page says. " Feel free to invite more
folks!"
For Coast Guard icebreaker teams,
it's all business. They've logged four
times more hours this season than the
average for the same period in recent
years, said Kyle Niemi, spokesman
for the agency's Cleveland district
headquarters.
The 240- foot- long ( 73- metre) Mackinaw
began its duties Dec. 16 - several
weeks earlier than usual - and
worked nonstop until Feb. 8, when traffic
slowed enough to allow a break.
" As you can imagine, the
crew's tired," Cmdr.
Michael
Davanzo said this week during a tour
of the ship in its home port of Cheboygan.
A 35- year Coast Guard veteran
who has spent 12 years on the lakes,
Davanzo said this winter is the toughest
he's experienced because the ice
came so soon and is so
thick and widespread,
and the weather has
been constantly
bitter.
The Mackinaw,
commissioned
in
2006 to replace an older vessel with
the same name, is designed specifically
for duty on the Great Lakes. It's
propelled by two Azipod thrusters that
can spin 360 degrees and fire jets of
water at adjacent ice, weakening it.
Sometimes the crew will drive the
ship's bow onto an ice sheet to crack
it with sheer weight. Or they'll go
backward, chopping up ice with the
propeller blades.
Davanzo hopes for rain and warmer
temperatures that would melt some ice
before the locks reopen in late March,
when the Mackinaw will venture onto
Lake Superior and clear paths for iron
ore and coal haulers.
" But if the weather stays like this,"
he said, " we could be breaking ice all
the way to the middle of May."
- The Associated Press
Ice not so nice for U. S. Coast Guard
Great Lakes
frozen over,
to the delight
of civilians
By John Flesher
SUPPLIED IMAGE
A yardstick measures the thickness of some of the ice the crew of cutter Katmai Bay,
background, battles during icebreaking operations in the Straits of Mackinac.
SUPPLIED IMAGE
The U. S. Coast Guard icebreaker Mackinaw maintains a shipping lane
on the St. Marys River linking Lakes Superior and Huron.
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