Tides and ocean currents: Practice Questions

Which celestial alignment results in the formation of neap tides?

The following data shows the tidal heights recorded at a coastal station over a period of time:
- Low Tide: \( 0.8 \text{ m} \)
- High Tide: \( 6.2 \text{ m} \)

What is the tidal range for this location?

During a La Ni\(ñ\)a event, how do the prevailing trade winds and the sea surface temperatures (SST) in the eastern Pacific change compared to a normal year?

In the Southern Hemisphere, the Coriolis effect causes ocean currents to be deflected in which direction?

The global ocean conveyor belt is a large-scale system of deep-ocean circulation. Which two properties of seawater are primarily responsible for driving this thermohaline circulation?

Describe the direction of deflection caused by the Coriolis effect on the movement of ocean currents in the northern hemisphere.

Using the relative positions of the Earth, Moon, and Sun, explain why a spring tide has a much larger tidal range than a neap tide.

Explain why spring tides exhibit a greater tidal range than neap tides, with reference to the alignment of the Earth, Moon, and Sun.

The relative alignment of the Earth, Moon, and Sun is the primary driver of tidal patterns.

(a) With reference to a diagram showing the Earth-Moon-Sun system, explain how the gravitational pull of the Moon results in the formation of two high tide bulges.

(b) Distinguish between a spring tide and a neap tide by describing the specific planetary alignments required for each event.

(c) State one factor other than the position of the Sun and Moon that can affect the tidal range in a specific coastal location.

The movement of the world's oceans is driven by complex interactions between celestial bodies and physical forces.

(a) Apart from the gravitational pull of the Moon and Sun, explain how two other factors, such as coastal geomorphology and air pressure, can influence the tidal range of a specific coastal area.

(b) Explain the mechanism of the Coriolis effect and describe how it influences the direction of surface ocean currents in the Southern Hemisphere compared to the Northern Hemisphere.

(c) Describe the formation of the global ocean conveyor belt and discuss the importance of density gradients (temperature and salinity) in maintaining this system.