During the 2003 cruises, three production line versions (#43325, #43262, and #43134) of the Sea-Bird SBE 43 oxygen sensor were used, and one prototype version (#43349) from Sea-Bird was tested. Sensor #43325 is a new sensor received from Sea-Bird in October 2002 (see previous section). The sensor’s pressure compensation bag was found leaking and was replaced at Sea-Bird in June 2003 after failing during HOT-146. Another Sea-Bird repair in August 2003 included replacement of the sensor’s SPAR assembly after the sensor had failed during HOT-150. As mentioned in the previous section, sensor #43262 was repaired at Sea-Bird in February 2003. The sensor has performed correctly during cruises HOT-145 through 151. Sensor #43134 has worked correctly during 2003 cruises; the sensor was routinely calibrated at Sea-Bird in June 2003. Sensor #43349 was received in August 2003 from Sea-Bird and tested successfully during HOT-151.

     Two sets of calibration parameters were usually obtained per HOT cruise, corresponding to the casts at Stations 1 and 2. Cruises HOT-144 through 147 had problems with the oxygen titration equipment, deeming the samples unreliable (Fitzgerald, 2003), thus comparisons between CTD and oxygen samples are not available for these cruises. The preliminary calibrations for cruises HOT-148 through 151 indicate that the standard deviation of the oxygen difference between calibrated CTD and bottle samples is less than 1 µmol kg-1 for the casts at station 2. Table 4.15 shows the oxygen sensors used during 2003 cruises.

Table 4.15: Oxygen sensors used during HOT 2003 cruises.

 

Cruise

First Sensor

Second Sensor

HOT-144

43134

43325

HOT-145

43325

43262

HOT-146

43325

43262

HOT-147

43262

43134

HOT-148

43262

43134

HOT-149

43262

43134

HOT-150

43262

43134

HOT-151

43262

43349

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