Materials
- Table 6.3
- Fig. 6.19
- Fig. 6.20
Procedure
A. Identify tidal cycles
- Identify what type of tidal cycle occurred most commonly during September 2003 in
- Icy Bay, Alaska
- Acapulco, Mexico
- On a few days in September 2003, other types of tidal cycles occurred in both cities.
- What types were they?
- On what days did they occur?
- Overall, which city has stronger tidal currents? Explain the reasoning for your answer.
B. Link moon phases tidal events
- Identify the date of the full moon on Table 6.3. On each of the tide graphs (Fig. 6.19), find the symbol ◯ for this event.
- Identify the dates of all other moon phases on Table 6.3: first quarter moon, third quarter moon, and new moon.
- On each of the tide graphs (Fig. 6.19), add the appropriate moon phase symbols to the appropriate dates.
- Consider the dates of the different moon phases in the tide graphs (Fig. 6.19).
- How do the phases of the moon appear to affect tidal ranges in Icy Bay, Alaska?
- How does this pattern of tidal ranges in Icy Bay compare to tidal ranges in Acapulco, Mexico during the different moon phases?
- Identify in each city when spring tides and neap tides occurred. What event caused each of these tides?
C. Add moon orbital events to the tide charts
- Refer to Table 6.3. Identify the dates of the moon’s apogee and perigee.
- On each of the tide graphs, add the appropriate symbol (A or P) for these 2 events.
- How does the moon’s elliptical orbit appear to affect tide patterns in the two cities?
D. Add moon declination events to tide charts
- Refer to Table 6.3. Identify the day when the declination of the moon is farthest north (28.5˚ N).
- On each of the tide graphs, add the symbol (N) for this event.
- On each of the tide graphs, add the appropriate symbols for the remaining moon declination events.