Kristin Poinar: What's hidden under the Greenland ice sheet?
Kristin Poinar: Sekrety lądolodu Grenlandii
Kristin Poinar uses remote sensing and numerical models to study the interaction of meltwater with ice flow, especially on the Greenland Ice Sheet. Full bio
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so I took a lot of breaks there.
więc tam spędzałam sporo przerw.
samolotu transportowego
hidden inside the ice sheet,
that the Greenland ice sheet is huge,
że lądolód zajmuje tam
is two miles thick.
downhill towards the ocean.
nieprzystępnych miejsc
remote physical environments
is like getting in on the ground floor
w pierwszej dekadzie stulecia.
and satellites over the ice sheets
dla mediów społecznościowych.
has done for social media.
a wealth of observations
nowe fakty o lodowcach.
about the ice sheets continuously.
of the size of the Greenland ice sheet
wielkości lądolodu Grenlandii
of the screen here
of the ice sheet melt
by an overall rate of mass loss
glacjologów 50 lat wcześniej.
a glaciologist 50 years ago.
lose mass into the ocean this quickly.
tak szybko tracić masę na rzecz oceanu.
on our smallest continent,
na najmniejszym kontynencie,
valleys, mountains and depressions
wzgórza, doliny, góry i niziny,
the size of the Grand Canyon
wielkości Wielkiego Kanionu Kolorado,
off of Greenland and into the ocean.
Grenlandię, zmierzając do oceanu.
can reveal the bedrock
transparent to radar.
an ice cube in the microwave.
kostkę lodu do mikrofalówki.
without interacting.
you have to get it wet,
musicie ją zwilżyć,
in the microwave.
podgrzewa się w mikrofalówce.
the microwave oven is designed around.
całe działanie mikrofalówki.
a vast pool of liquid water
back to the ice sheet's surface.
this glacier aquifer existed.
że istnieją warstwy wodonośne w lodowcu.
from the cold and the wind above.
i wiatrem na powierzchni.
hidden in the ice sheet
to reach the global ocean?
for the water to reach the bedrock
lodowcowe albo pęknięcia.
forces them deeper and deeper.
from deep within the earth.
in the Greenland ice sheet
w lądolodzie grenlandzkim
most of the Greenland ice sheet
form terenowych na powierzchni.
flies towards the coast,
porusza się w stronę wybrzeża,
on its quest to flow downhill,
są wypełnione ciekłą wodą?
do they take that water?
beyond remote sensing data.
niż samych danych z radaru:
that run on supercomputers.
na superkomputerach.
is simply a set of equations
to po prostu zestaw równań,
as the next number in a sequence --
jak kolejna liczba w sekwencji:
set of equations
the equations for how ice cracks?
a very good understanding
fracture under stress.
that the engineering equations
from my physics homework.
przystosowałam do lodu
for how a crevasse can fracture
powstawania pęknięć w szczelinach
z warstw wodonośnych.
real processes in our world.
procesy zachodzące w świecie.
the results of my numeric model,
mojego modelu numerycznego.
a thousand times narrower than it is deep,
tysiące razy węższa niż głębsza.
panel on the right
jak głęboka i cienka jest ta szczelina.
for how tall and skinny the crevasse is.
flows into the crevasse,
wpływa do szczeliny,
in the negative 15 degree Celsius ice.
w lodzie o temperaturze -15° C.
as your kitchen freezer.
the glacier aquifer is high enough.
all the way to the base of the ice sheet
aż do podstawy pokrywy lodowej,
to reach the ocean.
per year of sea level rise
wzrostu poziomu morza,
might be punching above its weight.
może więcej niż się wydaje.
w skomplikowany sposób.
at the base of the ice sheet here.
present at the base there.
is getting to the base of the ice sheet,
przedostaje się pod pokrywę lodową.
flow faster into the ocean?
ruch lodu w kierunku oceanu?
hidden inside the Greenland ice sheet
ukrywane przez warstwę lodową Grenlandii,
for the sea level rise it holds.
na wzrost poziomu morza.
that Greenland has lost since 2002
przez Grenlandię od 2002 roku
of what that ice sheet holds.
that operate on long timescales.
działające w dużej rozpiętości czasowej.
will rise at least 20 centimeters,
wzrośnie przynajmniej o 20 centymetrów,
of future sea level rise is good,
wzrost poziomu morza,
and scientists
należy się spodziewać
wzrośnie poziom morza,
plan for the sea level rise that's coming.
dla świata i ludzkości.
ABOUT THE SPEAKER
Kristin Poinar - GlaciologistKristin Poinar uses remote sensing and numerical models to study the interaction of meltwater with ice flow, especially on the Greenland Ice Sheet.
Why you should listen
Hidden under many meters of ice, a pool of meltwater lies under the Greenland Ice Sheet. Kristin Poinar studies how the meltwater forms and flows in this dynamic glacial system. She asks: How did this water get there, and where does it go? How much water is in there? And how is climate change affecting this system?
Using data from Operation IceBridge flights and from field instruments, she's building a numerical model of how crevasses form and channel water. In fact, a NASA report released in February 2017 revealed a new pathway her team discovered for meltwater to reach the ocean. Using physically based models to constrain the bounds of what is realistic has shaped Poinar's interest in glaciology.
Poinar is currently a postdoctoral researcher at NASA Goddard Space Flight Center. She will be moving to the University at Buffalo in winter 2017 to be a professor in the Geology Department and the RENEW Institute.
Kristin Poinar | Speaker | TED.com