During some of the 1999 cruises, various developmental versions of the Sea-Bird SBE 43 oxygen sensor were used. These sensors were calibrated at Sea-Bird before each cruise. In addition, three YSI Inc. probes (#13341, #13251 and #13434) were used.
Sensor #13434 is a new sensor acquired in March 1999. Sensor #13251 was refurbished at Sea-Bird when the oxygen module was found cracked in March 1999, after HOT-103. Sensor 13341 was sent to Sea-Bird for evaluation because of a slow response problem during HOT-101, the problem was attributed to the use of a low sensitivity membrane instead of the appropriate high sensitivity membrane (see Sect. 4.10).
Sensor #13434 had its membrane and electrolyte replaced prior to HOT-107. Sensor #13341 had its membrane and electrolyte replaced prior to HOT-101; and sensor #13251 had them replaced prior to HOT-101, -102, -103, and -110.
Three sets of parameters were obtained per HOT cruise, corresponding to the casts at Stations 1, 2 and 8. Casts from HA-6A and -7A were calibrated with bottle data obtained during those cruises.
Table 4.11 gives the means and standard deviations for the final calibrated CTD oxygen minus water sample values. HOT-104 did not have CTD oxygen data at Station Kahe
Table 4.11a: CTD-Bottle dissolved oxygen per cruise
at Station Kahe (µmol kg-1)
|
|
|
0 to 1500 dbar
|
|
|
Cruise
|
Sensor
|
Mean
|
SD
|
| HOT-101
|
43003
|
0.00
|
0.63
|
| HOT-102
|
13341
|
0.02
|
1.56
|
| HOT-103
|
13251
|
0.00
|
0.73
|
| HOT-105
|
43053
|
0.00
|
0.88
|
| HOT-106
|
13434
|
0.01
|
0.72
|
| HOT-107
|
13251
|
0.00
|
0.96
|
| HOT-108
|
13251
|
0.02
|
1.48
|
| HOT-109
|
43071
|
0.00
|
1.15
|
|
HOT-110
|
43071
|
0.00
|
0.41
|
Table 4.11b: CTD-Bottle dissolved oxygen per cruise at Station ALOHA (µmol kg-1)
|
|
|
0 to 4800 dbar
|
500 to 4800 dbar
|
||
|
Cruise
|
Sensor
|
Mean
|
SD
|
Mean
|
SD
|
| HOT-101
|
43003
|
0.02
|
0.89
|
0.05
|
0.75
|
| HOT-102
|
13341
|
0.03
|
1.05
|
0.06
|
0.93
|
| HOT-103
|
13251
|
0.09
|
1.10
|
0.16
|
1.06
|
| HOT-104
|
13434
|
0.17
|
0.94
|
0.36
|
0.98
|
| HOT-105
|
13434
|
0.00
|
1.15
|
0.13
|
0.97
|
| HOT-106
|
13251
|
0.11
|
1.42
|
0.37
|
1.16
|
| HOT-107
|
13251
|
0.38
|
1.70
|
0.48
|
1.29
|
| HOT-108
|
13251
|
0.33
|
1.52
|
0.56
|
1.10
|
| HOT-109
|
43071
|
0.27
|
1.26
|
0.54
|
1.38
|
|
HOT-110
|
43071
|
0.21
|
1.21
|
0.28
|
1.10 |
Table 4.11c: CTD-Bottle dissolved oxygen per cruise at HALE-ALOHA (µmol kg-1)
|
|
|
0-1500 dbar
|
|
|
Cruise
|
Sensor
|
Mean
|
SD
|
| HOT-101
|
43003
|
0.00
|
0.13
|
| HOT-102
|
13341
|
0.00
|
0.95
|
| HOT-103
|
13251
|
0.01
|
0.33
|
| HOT-104
|
13434
|
0.01
|
0.89
|
| HOT-105
|
13434
|
0.02
|
1.26
|
| HA-6A
|
43054
|
0.01
|
1.01
|
| HOT-106
|
13251
|
-0.01
|
1.05
|
| HOT-107
|
13251
|
0.00
|
0.84
|
| HOT-108
|
13251
|
0.00
|
0.33
|
| HA-7A
|
13251
|
0.01
|
0.88
|
|
HOT-110
|
43071
|
0.01
|
1.06
|
Figure 4.12 shows the CTD oxygen data quality for every 2-dbar bin in each cast at Station ALOHA for cruises 101 through 110.
Figure 4.12. CTD oxygen data quality per cast (vertical bars) and
per 2-dbar bin at Station ALOHA during HOT cruises 101 through 110. The
tick marks along the x-axis separate different casts. Casts from the same
cruise are separated by vertical black lines.
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