Geoscience Reference
In-Depth Information
Fig. 4.23 Influence of solar
radiation intensity on the
vertical structure of upwelling
ecosystem after the 30th day
of its evolution
Table 4.11 Phytoplankton
biomass dynamics as function
of initial concentration of
nutrients salts
Layer, m
n(
0 , z, t 0 )
= 400 mg/m 3
The ecosystem lifetime (days)
10
0 , z, t 0 )
= 100 mg/m 3
φ
0 ,
ʻ
n(
φ
0 ,
ʻ
50
100
10
50
100
0
10
0.3
0.1
0
0.3
0.1
0
-
10 - 20
31.7
8.7
10.9
37.4
16.1
15.4
20
30
39.6
9.4
10.7
289.7
7.8
10.4
-
30
40
39.4
9.2
10.6
207.7
7.8
10.4
-
40 - 50
36.6
9.7
10.9
295.1
7.9
10.7
50
60
36.7
9.5
10.9
153.7
7.1
10.5
-
60
70
41.7
11.4
10.9
62.1
18.9
8.8
-
70 - 80
13.4
15.7
11.2
15.6
10.3
17.9
80
90
1.9
31.4
17.0
2.1
39.0
17.9
-
90
100
0.6
3.6
12.8
0.6
4.2
1.4
-
100 - 150
3.1
2.1
2.1
3.1
2.2
3.4
150 - 200
0.9
0.4
0.5
0.8
0.7
0.7
upwelling ecosystem does not achieve the stability and this means that predatory
elements are the regulating factor.
Ratio of phytoplankton production to its biomass (p/b
cient) is, generally,
one of the important characteristics of oceanic ecosystem and it de
coef
nes the eco-
system stability character. For example, Fig. 4.25 shows that upwelling ecosystem
evolution for its p/b
coef
cient always equals to 3. In fact, p/b
coef
cient
changes depends on the time, beginning from 15 in upwelling zone and
finishing by
1 in the oligotrophy zone (Vinogradov et al. (1970, 1975).
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