Ocean Gyres and Ekman Transport

The video tutorial explores the concept of meridianal transport and its relation to wind stress and ocean currents. It delves into the historical context of Fritjof Nansen's discovery of Ekman transport, explaining the derivation of Ekman equations and their solutions. The tutorial further discusses the Ekman spiral, layer depth, and compares the idealized Ekman layer with real ocean conditions, highlighting the theoretical and practical aspects of oceanography.

What is the primary factor that causes the termination of ocean gyres?

• The decrease in ocean temperature

• The increase in ocean salinity

• The presence of underwater mountains

• The end of trade winds and beginning of westerlies

Who was the scientist that first observed the drift of icebergs at an angle to the wind?

• Albert Einstein

• Fridtjof Nansen

• Isaac Newton

• Galileo Galilei

What assumption did Ekman make in his calculations regarding pressure gradients?

• They are constant

• They are equal to wind stress

• They are the primary force

• They can be ignored

In Ekman transport, what happens to the wind stress at depth z_e?

• It doubles

• It remains constant

• It increases

• It goes to zero

What is the direction of Ekman transport in relation to the wind?

• Parallel to the wind

• Opposite to the wind

• At 30 degrees to the wind

• At right angles to the wind

What is the Ekman spiral?

• A real-world ocean current pattern

• A method for measuring wind speed

• An idealized theoretical model

• A type of ocean wave

How does the Ekman spiral affect the direction of ocean currents?

• Currents move in circles

• Currents tilt to the right

• Currents tilt to the left

• Currents move in a straight line

What is the main difference between the Ekman layer and the mixed layer?

• The Ekman layer is deeper

• The Ekman layer is a theoretical construct

• The mixed layer is based on temperature

• The mixed layer is affected by salinity

What is the primary force balancing the Ekman currents in the ocean?

• Magnetic force

• Gravity

• Tidal force

• Coriolis force

Why is the Ekman spiral not observable in the real ocean?

• It only occurs in certain seasons

• It is an idealized model

• It is too deep to measure

• It requires specific equipment