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APEX records a profile during ascent (ie upcast). Bottom pressure may change due to several
causes, such variation of insitu density, internal waves, float grounding in shallows, change of
float mass, etc. APEX automatic depth adjustment will compensate in most, but not all, cases.
The number of sample points taken is proportional to depth, as per sample depth table below.
The first (i.e. deepest) sample is taken at the first point in the depth table above bottom pressure.
Depth Table No. 38
Sample Pressure Sample Pressure Sample Pressure
Point
(dbar)
Point
(dbar)
Point
(dbar)
Bottom
1
27
53
2000
340
90
2
28
54
1900
330
85
3
29
55
1800
320
80
4
30
56
1700
310
75
5
31
57
1600
300
70
6
32
58
1500
290
65
7
33
59
1400
280
60
8
34
60
1300
270
55
9
35
61
1200
260
50
10
36
62
1100
250
45
11
37
63
1000
240
40
12
38
64
900
230
35
13
39
65
800
220
30
14
40
66
700
210
25
15
41
67
650
200
20
16
42
68
600
190
15
17
43
69
550
180
10
18
44
70
500
170
7
19
45
71
480
160
4 or surf
20
46
460
150
21
47
440
140
22
48
420
130
23
49
400
120
24
50
380
110
25
51
360
100
26
52
350
95
* The SeaBird CTD is not sampled at zero pressure, to avoid pumping the cell dry and/or
ingesting surface oil slicks. The shallowest profile point is taken at either 4 dbar or at the last
recorded surface pressure plus 5 dbar, whichever value is larger.
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