2.1.2 Video: The water cycle on the planet

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Oceanography: a key to better understand our world

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Universitat de Barcelona

Oceanography: a key to better understand our world

29 classificações

The course for a round the world regatta leads the boats through the Mediterranean Sea and the Atlantic, Southern Indian and South Pacific Oceans. On their voyage, the skippers come across a large variety of oceanographic situations: strong currents, floating ice, wave formations of every kind and biological diversity. In this course the student will learn about the foundations of the science of oceanography. You'll learn about the classification and formation of the ocean floor, how current sea satellite analysis systems work, the chemistry of the oceans and the processes that led to its formation. To follow this course does not require previous knowledge of oceanography.

Na lição

2. The Global Ocean

This module will enter fully into the Global Ocean, will review and generalize the aspects previously referred to in the previous module. We will see the role of the ocean on a global scale, and how we can affect those who live closer or farther from the coast. Try to understand why it is still quite unknown and will glance nose in the marine environment. That is, how it behaves for those living beings, most who live within the ocean or in direct contact with him.

2.1.1 Video: From the Mediterranean to the ocean. Changing scales past Gibraltar12:20

2.1.2 Video: The water cycle on the planet6:17

2.1.3 Video: The confinement of the ocean and the freedom of the atmosphere. Exchanges of energy and evaporation. Heating and cooling. Consequences of ocean dynamics.14:38

2.1.4 Video: Vertical structure by density. Intrusions and intermediate waters7:22

Conheça os instrutores

Jordi Serra
Dr.
Grupo de Geociencias Marinas

[MUSIC]

In this module, we are going to talk about the Global Ocean.

But the Global Ocean

is a very huge space of

water on our planet.

So let's go to our planet which is called the Earth, which is our land.

Our land is the Earth and at a first sight, our land is something like this.

So we have landscapes, as several kind of

landscapes, but the real Earth is this.

This is almost all water.

There's water in the ocean, there's water in the atmosphere, in a form of clouds.

And this is the object of this first

lecture is: what happens with the water on the Earth.

How much water is and where?

This is a big amount of water is in the oceans.

Here are the numbers, you can just see, this numbers.

I'm not going to talk about this

because you find this numbers in a lot of places.

But to have an idea of this volume, these numbers that you have seen.

It's better if you see this proportional issue.

If the oceans were a swimming pool, then,

the continental ice which is the next component of water that have more volume,

is a bath, the underground water, water which is below the earth,

below the land is about a bucket.

All the whole water of rivers and

lakes on land is about a very, very small piece of water,

they protect this small bucket.

This protection of a finger, and the water in the atmosphere is just a drop

of water, in this proportion, to have an idea.

But water is moving from one component to another is not always even.

See the atmosphere flowing, underground water flowing,

rivers and finally to the sea.

That moving from one component to other is the water cycle and

we are just giving some figures about the water cycle.

The water cycle, the naif version of the water cycle is like this.

So you can imagine that it's, but this is

a vision from land.

The real vision of the water cycle,

you have to see from the ocean which is the most, covers the Earth.

And here is a section,

it's a virtual section from the North Pole to the South Pole.

And we can see that in the North Pole there is no land.

It's an ice cover because the surface of the ocean is covered by ice.

Here, these is also ice covered.

But also an ice cover above the land.

This is the Antarctic, and this is the ocean.

So you can see that the ocean is evaporating.

That's these waters evaporating here,

it's condensing in clouds and then precipitating.

Most of the water precipitates in the ocean.

And this is the real, the real.

This is a scheme of the amount of water moving from ocean

to continents, from ocean to atmosphere, from continents to the ocean.

From continents to the atmosphere, and finally from the atmosphere to the ocean,

and from the atmosphere to the continents.

And just to have an idea this is the proportion, so

only about 20 to 22% of the water is raining,let's say from the atmosphere.

Is raining on the continents while the 78% is raining into the ocean.

And here are some fields that we will discuss later.

Just that here, the only thing is that,

if you see the water raining on the continent,

63% of the water raining from the continent is recycled.

The water evaporating from the same continent, just moving from the plants or

from the rivers or from the lakes to the atmosphere.

And it's safe fresh water just flowing from

the surface to the upper atmosphere.

While 37% is new fresh water or is water coming from the ocean.

It's evaporated from the ocean so it's from salty water.

That's the difference.

And this is an important difference because this is, let's say,

some kind of desalinization of the water.

And this is the new fresh water.

And now in the next chapter we will see how?

Where?

And when?

This fresh water is coming.

And this will give us an idea because this is one

of the first agents, moving water of the oceans.

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