Name: Everything It Takes to Explore Beneath Polar Ice Caps
Uploaded: 2020-04-04T09:30:34.000Z
Duration: 4 min 19 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

a part of the world that is more foreign to scientists

Dr. Alex Forrest is at the forefront  of that work.

His robots are built to access underneath ice shelves,

and to gather data for large-scale maps and models

"How is a shoreline changing after a storm?"

And, "how fast is polar ice really melting?"

and this ice shelf been an area of interest

Basically, a piece of ice the size of Manhattan

broke off and drifted off, and it exposed,

in cross-sectional view,  one of these subglacial channels

that we've been trying to get access to for a while.

We're aiming to go back there again with gliders and AUVs,

and how much energy is being transported through that system.

so if we understand how much heat is in that water,

we can understand how much of that heat is coming from the ocean

and how much of that is coming from the ice itself.

Alex builds tools including Autonomous Underwater Vehicles, or AUVs

He then uses gliders to sample the water column

providing him with turbulence, temperature,

What a glider will do, is move oil around to displace more or less volume

to make it heavier or lighter than the water it's in.

When it reaches an inflection point, it will pump itself light and then point upwards.

The wings create a lift and start drawing it forward.

In here is a satellite phone connector, a GPS receiver, and a free wave,

So we can talk to it when it's sitting up on the surface

and tell it where to go from anywhere in the world.

All together, these chemical and environmental fluid mechanic data

create a comprehensive model of this ecosystem.

Exploring these icy frontiers is a balancing act

of keeping people and equipment safe in extreme weather and ocean conditions,

and preserving the very delicate ecosystem we want to study.

One of the biggest challenges underwater is that we don't have positioning.

We don't have WiFi, we can't get radio signals through, we don't have GPS...

all of these tools that we use in regular, terrestrial mapping.

You're basically guessing where you are underwater, so you need to develop navigation algorithms

Now, you put that on a ship, and then s@$%,

you all of a sudden are influenced by the waves.

So the waves, storms, et cetera will then modify how your data looks.

What we don't want to happen is to have our vehicle modify the fragile ecosystem that

Despite these challenges, Alex and his team continue to gather this data

as it is one of the clearest examples  of how the planet's climate

The polar regions are changing faster than anybody ever predicted.

It's not just a matter of large pieces of ice shelves collapsing.

What I find more intimidating is the idea that our sea ice volume

is at some of the lowest it's ever been before;

that the Arctic ocean temperatures are getting warmer

So we need to know the baseline conditions of today if we're to predict how they're gonna

and also to understand as a global community

Subtitles ListPlay Video

Everything It Takes to Explore Beneath Polar Ice Caps

crucial

access

delicate

basically