Environmental Engineering Reference
In-Depth Information
Table 9.
The isotope composition of POC in the upper water column of the central Black Sea.
13
C,
‰
Water layer,
Station
Date
δ
Reference
m
number
-23.0
∗
1
0 - 100
7
25.03 - 06.04
[20]
1969
−
21.8
÷−
24.1 [10]
2
0 - 40
1
05.1988
-25.2
[36]
−
24,4
÷−
26,0 [5]
3
0 - 35
4
09. - 10. 1992
-22.64
[58]
−
21.4
÷−
24.8 [11]
4
0 - 40
6
-27.2
[50]
05. 1998
−
24,2
÷−
30,2 [7]
∗
Numerator - the average δ
13
C, ‰;
13
C values; number in brackets - number of samples.
denominator - range of δ
34
C of POC in the
western cyclonic gyre [9]. Vertical lines and numbers show the time of sampling: 1 - beginning
of April 1969 [20];2-beginning of May 1998 [50]; 3 - end of May 1988 [36]; 4 - end of
September 1992 [58].
Figure 4.
Seasonal variability of the primary production (solid line) and δ
This may be a result of seasonal differences in specific rates of photosyn-
thesis. The literature data point to an inverse relationship between the carbon
