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For APEX Apf-5, Apf-7, Apf-8 (basically all firmwares that truncate negative surface pressure values), when SP time series show all values = zero, it means the float may be experiencing negative pressure errors. In those cases: PRES_ADJUSTED_QC = ‘2’ TEMP_ADJUSTED_QC = ‘2’

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  1. For APEX Apf-5, Apf-7, Apf-8 (basically all firmwares that truncate negative surface pressure values), when SP time series show all values = zero, it means the float may be experiencing negative pressure errors. In those cases: PRES_ADJUSTED_QC = ‘2’ TEMP_ADJUSTED_QC = ‘2’ PSAL_ADJUSTED_QC = ‘2’ SCIENTIFIC_CALIB_COMMENT = “TNPD: APEX float that truncate negative pressure drifts. No pressure adjustment available.” PRES_ADJUSTED_ERROR = ? PRES_QC, TEMP_QC, PSAL_QC to be decided by RT DACs.

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