Difference between revisions of "En-en adult card 17 increase in water temperature"

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|title=Increase in Water Temperature
|title=Increase in Water Temperature
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== Explanation==
The ocean is warming by only about a tenth of a degree at the surface and even less under water. Why so little when it absorbs 93% of the excess energy on Earth? This is because it is much larger than the atmosphere and it has a much greater calorific capacity.
To measure this, you need to remember that the ocean covers 71% of the Earth's surface and that it has a depth of 4000 m on average. The atmosphere extends over a greater height, but if brought it back to the same density as water, it would only be 10 m thick. (That's why we gain one atmosphere of pressure every 10 m when we dive.)
The water expands very little. How can warming the ocean by a tenth of a degree result in a rise in the water level? A first answer is that the ocean is 4000 m deep on average, so a very small expansion is enough to amount to a few centimetres.


== Correction==
== Correction==
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* [[En-en_adult_card_34_cyclones|Cyclones]]
* [[En-en_adult_card_34_cyclones|Cyclones]]
* [[En-en_adult_card_42_methane_hydrates|Methane Hydrates]]
* [[En-en_adult_card_42_methane_hydrates|Methane Hydrates]]
== Explanation ==
The ocean is warming by only about a tenth of a degree at the surface and even less under water. Why so little when it absorbs 93% of the excess energy on Earth? This is because it is much larger than the atmosphere and it has a much greater calorific capacity.
To measure this, you need to remember that the ocean covers 71% of the Earth's surface and that it has a depth of 4000 m on average. The atmosphere extends over a greater height, but if brought it back to the same density as water, it would only be 10 m thick. (That's why we gain one atmosphere of pressure every 10 m when we dive.)
The water expands very little. How can warming the ocean by a tenth of a degree result in a rise in the water level? A first answer is that the ocean is 4000 m deep on average, so a very small expansion is enough to amount to a few centimeters. A more complete explanation is given in a practical sheet.


[[fr:Fr-fr_adulte_carte_17_hausse_température_eau]]
[[fr:Fr-fr_adulte_carte_17_hausse_température_eau]]

Revision as of 15:28, 5 April 2021

Card #17: Increase in Water Temperature

Causes Consequences
Front of the card "Increase in Water Temperature"


Oceans absorb 93% of the energy accumulated on Earth.
Their temperature has therefore increased, especially in the upper layers.
The water expands as it warms up.

Explanation

The ocean is warming by only about a tenth of a degree at the surface and even less under water. Why so little when it absorbs 93% of the excess energy on Earth? This is because it is much larger than the atmosphere and it has a much greater calorific capacity.

To measure this, you need to remember that the ocean covers 71% of the Earth's surface and that it has a depth of 4000 m on average. The atmosphere extends over a greater height, but if brought it back to the same density as water, it would only be 10 m thick. (That's why we gain one atmosphere of pressure every 10 m when we dive.)

The water expands very little. How can warming the ocean by a tenth of a degree result in a rise in the water level? A first answer is that the ocean is 4000 m deep on average, so a very small expansion is enough to amount to a few centimetres.

Correction

Causes

Consequences