ITP51 Data Processing
The 76 profiles that were transmitted from the ITP were processed according to the procedures described in the ITP Updated Data Processing Procedures. The processing parameters for this ITP are shown in the figures to the right.
Thermohaline staircases were available in the upper portion of the profiles (100-250dbar) to generate initial estimates for CTD lag corrections. Thermal lag estimates were relatively large, particular for the second half of the record, suggesting possible sensor or pump issues. They were manually increased further manually to reduce hysteresis between up- and down profiles. The deeper portions were relatively noisy. This could again relate to sensor issues, but may at least in part be due to variability near the shelf break being different from the typical deep ITP data in the central gyre.
During the second profile, the oxygen calibration "dorat" jumped from 1 to about 1.2, but subsequent profiles retained a realistic shape. A second jump to much larger jump occurred at profile 33 and lasted through profile 43, after which it precipitously back to near 1.2. Dorat values of close to 5 were unrealistic, as was the shape of these profiles, and they were edited out. The remainder of the record started with increased up/down O2 differences, and the worst offenders were also edited out.
See the Data Products tab to the left for descriptions of the three levels (I, II, III) of data processing and to access all data.
