Sensor #13341 showed spikes during HOT-96 and was sent to Sea-Bird for inspection, where the sensor’s head was found cracked. The sensor was refurbished in September 1998 and used in the following cruises, but it showed a slow response problem. The sensor could not be sent to Sea-Bird for inspection until February 1999 due to insufficient turnaround time between cruises. The inspection revealed that the problem with the sensor was that a low sensitivity membrane was inadvertently being used instead of the high sensitivity membrane required. Data from this sensor are not reported for the cruises affected.
Data from sensor #13251 are reported here for all the 1998 cruises, except for HOT-91, during which spikes were seen in some casts, data from sensor #13341 are reported instead. Sensor #13251 showed offsets in the data during the deep casts of HOT-97 and -99, these data were flagged suspect.
Three sets of calibration parameters were obtained per HOT cruise, corresponding to the casts at Stations 1, 2 and 8. Casts from HA-4A and -5A were calibrated with bottle data obtained during those cruises.
Table 4.10 gives the means and standard deviations for the final calibrated CTD oxygen minus water sample values.
Table 4.10a: CTD-Bottle dissolved oxygen per cruise (µmol kg-1)
Figure 4.11 shows the CTD oxygen data quality
for every 2-dbar bin in each cast at Station ALOHA for cruises 89 through
100.
Figure 4.11. CTD oxygen data quality per cast (vertical bars) and per 2-dbar bin at Station ALOHA during HOT cruises 89 through 100. 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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