Vertical Distribution and Biochemical Composition of Rico- and Microparticulate
235
65' s
70* S
75* S
Fig. 1. Study area and sampling stations
ation of irradiance (PAR) was measured with a LI-COR (mod. 801, Idronaut)
quantum meter and related data are reported by Innamorati et al. [16]. The base
of the photic zone was defined as the depth at which 1% of the surface irradiance
was présent (Table 1). The depth of the mixed layer (Zmjx) was calculated as depth
at which the sigma-t gradient is higher than 0.1 unit m 1 [14,15].
2.3 Particulate Matter Analysis
Water samples were collected throughout the water column using Niskin bottles
(101). Sampling depth ranged between 100 and 1500 m for total POM analysis and
Table 1. Sampling stations for fractionated POM analysis: latitude, longitude, depth, surface température, salinity and depth of the photic zone and mixed (Zmix) layer at the sampled stations
Station Latitude (°S) Longitude (°E) Depth
(m)
Temp.
(°C)
Salinity Photic zone
depth (m)
^mix
(m)
17
73° 13.51
179° 50.28
526
-0.55
34.24
61
72
19
74° 56.88
179° 49.08
440
-0.57
34.37
39
47
21
74° 59.08
174° 52.43
340
-0.25
34.33
55
78
23
74° 59.59
169° 59.84
335
1.30
33.93
15
12
25
74° 56.80
165° 14.79
875
-0.14
33.21
14
14
2
74° 41.45
164° 24.01
541
0.65
32.75
18
19
3
74° 39.06
164° 14.66
180
0.84
33.43
40
43
7
74° 46.59
164° 03.78
195
1.28
33.62
15
16
8
74 °42.70
164° 08.84
160
0.37
33.80
15
13
12
74° 45.26
164° 06.26
100
0.19
33.90
13
15
16
74° 38.27
164° 04.58
232
0.47
33.95
10
9
17a
74° 40.13
164° 11.75
516
0.01
33.51
10
6