Moonrise over Friday Harbor.
(If the table below seems crooked or out of line, go to Options/Preferences
in Netscape & set your browser's fixed font as Courier.)
Here are the data from our collections:
0900 = outside
1130 = inside
1700 = inside (stormy)
0600 = outside (dawn)
Pacific - Friday Harbor 11-Apr 11-Apr 11-Apr 11-Apr 12-Apr
0900PDT 1130PDT 1700PDT 0400PDT 0600PDT
Air Temp (degrees C) 10 10 11 - 7
Water Temp (degrees C) 9 9 10 - 9
Salinity (ppt) 29 29 28 - 28
Dissolved Oxygen (mg/l) 8 9 8.5 - 8
Turbidity (meters) 9.5 9 2 - 7
Tide Ht (ft; measured) 6.3 6 1.15 - 6
Tide Ht (ft; predicted) 6.5 5.5 .3 - 7
Things to think about:
Plot these data over time to illustrate how they vary.
Which physical factors change the most throughout the day? Why?
Is the salinity at Friday Harbor different than at Woods Hole?
Why?
Where does the oxygen come from, and what depletes it?
What factors might increase water turbidity (or decrease clarity)?
Is turbid water necessarily an unhealthy condition?
What causes the tides?
Why might the recorded tide height be different from the tide
table prediction?
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