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Data Processing

The 682 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 the CTD and dissolved oxygen data are shown in the figures to the right. The biosuite sensor failed and provided no data, while SAMI data validation are described in Islam et al., (2017).

Lag correction estimates for the CTD and dissolved oxygen were in typical ranges where thermohaline staircases were detected, but were largely interpolated over most of the time series. The dissolved oxygen sensor data profile-to-profile corrections were larregly constant, but increased significantly at the end of the series. The SAMI sensor provided good time series of temperature, salinity and dissolved oxygen at 6 m, but the pCO2 were deemed to be bad in post processing.

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.

References:

Islam, F., M.D. DeGrandpre, C.M Beatty, M.-L. Timmermans, R.A. Krishfield, J.M Toole, and S.R. Laney, 2017. Sea surface pCO2 and O2 dynamics in the partially ice-covered Arctic Ocean. Journal of Geophysical Research, Vol. 122, doi:10.1002/2016JC012162.

ITP surface buoy status.
ITP profiler engineering data.
Number of bad points removed (top); variance of vertical difference of temperature and salinity in step region for up-going profiles; depth of staircase layer; temperature lag (bottom).
Top: conductivity lag, Middle: conductivity thermal mass amplitude correction, Bottom: conductivity thermal mass lag correction.
Top: down pressure deviation correction, Middle: salinity ratio adjustment, Bottom: Number of filtered spikes.
Top: number of bad dissolved oxygen points removed, Middle: dissolved oxygen ratio adjustment, Bottom: Number of filtered spikes.
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