Lecture 1 Flashcards
What percentage of water on Earth is sea water?
97.4%! Most of water on earth!
What percentage of the planet Earth is ocean?
71%
What is the average depth of ocean on Earth?
About 3,700m 富士山標高
What is the name of the location where the ocean is deepest?
Where is it?
How deep is it?
Marianas Trench
South of Honshu, Japan
11km deep
What is the temperature range of ocean water?
-2℃ — 40°C
Near hydrothermal vents: 400°C
What is the global average temperature of ocean water?
3.5°C
What is thermocline?
The oceanic water layer in which water temperature decreases rapidly with increasing depth.
Which one is warmer:
Surface water or Deep sea water?
Surface water. Average temp is 23°C.
What components affect the density of ocean water?
Temperature and salinity
What is pycrocline?
The boundary separating two liquid layers of different densities.
There are two cups of water. Both are of an equal salinity. One is at 5°C and the other is at 20°C.
Which one has higher density?
The colder one has higher density.
What is halocline?
The layer of oceanic water where the salinity changes rapidly with increasing depth.
Warmer water has higher salinity.
True or False?
True.
On a local scale, you may find a ‘lens’ of high density water at the ocean surface. How could this happen?
When the evaporation rate is high, the surface water may have a higher density because of increased concentration of salt.
