On CalCOFI 1210NH, a RINKO optode oxygen sensor was deployed on 51 CTD-Rosette casts. Along with the RINKO sensor, a Seabird SBE43 oxygen sensor functioned as the primary oxygen sensor for the cruise. There were 75 stations in total - on 24, an altimeter was needed so the RINKO sensor was disconnected & dummy plugged. On casts 005 - 024, 026, 036 - 052, 061 - 067, the RINKO was mounted vertically; on casts 068 - 072, the RINKO was mounted horizontally.
RINKO oxygen values were very close to Winkler titration oxygen sample values. Comparison of RINKO oxygen data to processed non-bottle corrected SBE43 oxygen data were significantly different (~-0.6 ml/L). Bottle-corrected SBE43 oxygen values, which SIO-CalCOFI considered the best data, did not significantly differ from either RINKO or bottle values (>0.1ml/L). Based on these very preliminary comparisons, if bottle oxygen calibration samples are not available, the RINKO optode oxygen sensor would provide significantly better data than the SBE43.
| Plot file containing all 51 oxygen plot comparisons: 1210RINKOvsSBE43plots.zip | |
| RINKO Compared to processed SBE43, not bottle-corrected | RINKO Compared to processed SBE43 & SBE43 bottle-corrected |
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.png "One example where bottle-corrected SBE43 is better than RINKO") |
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.png "Both RINKO & bottle-corrected SBE43 agree well with bottle oxygen samples") |
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.png "3500m deep cast, RINKO is better between 400-500m but btl-corr SBE43 agrees better at 3500m") |
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| Average diff = 0.000, StDev = 0.1541 | Average diff = -0.001, StDev = 0.1379 |