Range and gradient checks for temperature and salinity, and density inversion check can be easily made in this window: erroneous data detected by criterions set by World Ocean Database 1998 of US-NODC/Ocean Climate Laboratory are shown also with red colored curves automatically (Fig.6). The T-S diagram, horizontal and vertical quantity distributions, error list, and summary report of observation are also obtainable through POD-QC.
The MIRC performed quality checks to POD of Wakayama PFES from 1975 to 1995 using POD-QC. The POD-QC detected 387 erroneous sections of estimated ship speed exceeding 15 knots between stations and 511 erroneous stations of observed level exceeding 15% of water depth. The almost errors were corrected by references, such as field notes and cruise reports, because the errors were caused by input fault. Finally four stations (i.e., two sections) for ship speed and nine stations for observed level are flagged as error by POD-QC respectively. In the number of 14, 164 profiles (127, 136 observed levels and 100,461 layers), there was no error of range outlier of temperature and salinity, and 150 erroneous layers of temperature gradient or inversion and 672 erroneous layers for density inversion except surface layer were also detected and flagged respectively. By investigation for history of the measurement of salinity, it is seen that the density inversion errors except surface layer were mainly occurred before early 1970s (Fig.7).
Fig.4 Monthly, bimonthly or seasonal fixed observation lines of Prefectural Fisheries Experimental Stations.
