 |
|
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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