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

Latest revision as of 10:37, 31 October 2021

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-{{Card
+#REDIRECT [[En-en_adult_card_17_Rising_Water_Temperatures]]
-|number=17
-|version=adult
-|title=Increase in Water Temperature
-}}
-== 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. A more complete explanation is given in a practical sheet.
-[[fr:Fr-fr_adulte_carte_17_hausse_température_eau]]