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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