68
4 Statistical Models and Techniques
4.3.1.13
Case Study: Temporal Development of Nutrients over a Tidal Cycle
Data provided by G. Liebezeit and V. Niese!.
Question: Do phosphate and silicate content develop in a parallel way during
one tide'l (Fig. 4.3.13)
16
3.0
-+- silicate
•
-. - phosphate
2.5
12
,
............
r - -.
~
~
' .
2.0 2.
2.
C1l
1.5 ~
C1l
8
.,
ro
.....................
a.
g
en
0
'iii
1.0 -§.
4
0.5
a
0.0
14:4515:4516:4517:4518:4519:4520:4521 :45 22:45 23:4500:45 01 :45
F
F
F
F
F E E
E
E
E
E LW
Fig. 4.3.13 Hourly changes in silicate and phosphate concentrations during one tidal cycle.
F: flood tide, E: ebb tide, L W: low water
16
3.0
-+- silicate
- .- phosphate
2.5
12
~
.. -..... ... '
~
~
' .
.
2.0 2.
2.
2
C1l 8
,.
1.5 ro
ro
..c
.~
........
a.
.
en
'iii
..
0
1.0 ..c
..
a.
4
0.5
o
0.0
18:4521 :45 22:45 20:45 19:4523:4517:4516:4515:4500:4514:4501 :45
Fig. 4.3.14 Hourly changes in silicate and phosphate concentrations during one tidal cycle as in
Fig. 4.3.13, sorted by values of silicate