SHERMAN(WHEC720), PX38
Observation period : 2017/6/20 to 2017/6/27

This page shows results for the PX38 line based on monitoring by the SHERMAN and comparison with the result of assimilation by MOVE-NP.

Overall statistics

Number of profilesNumber of dataAVERMSDMAXDMIND
9832283-0.100.582.59-3.99

Abbreviations in the table indicate:
AVE: average difference (observation value minus assimilation value)
RMSD: root mean square of difference
MAXD: maximum difference
MIND: minimum difference



Statistics for each depth range

Depth rangeNumber of dataAVERMSDMAXDMIND
0-502450-0.160.621.86-2.86
50-1002450-0.190.701.29-2.68
100-1502450-0.120.761.69-3.69
150-2002450-0.240.882.36-3.99
200-2502450-0.210.842.53-3.74
250-3002450-0.180.632.04-2.75
300-3502450-0.110.461.56-1.82
350-4002450-0.080.421.34-1.65
400-4502450-0.070.371.37-1.48
450-5002450-0.060.321.22-1.33
500-550980-0.050.291.02-1.28
550-600980-0.030.261.19-1.02
600-650980-0.010.251.48-0.76
650-7009800.020.271.72-0.61
700-7509780.060.291.91-0.39
750-8009700.070.312.08-0.31
800-8509700.090.322.25-0.38
850-9008560.090.362.42-0.32
900-950810.800.922.56-0.17
950-100081.650.752.590.83


Results of QC

A total of 98 profiles (43600 data, reported by BATHY or TESAC) were received from the SHERMAN.
The results of JMA quality control are as follows.
  • Grounded test
  • Error data: 0 of 43600

  • Position on land test
  • On land: 0 of 98

    Invalid position: 0 of 98

  • Regional range test
  • Error data (low): 0 of 43600

    Error data (high): 9 of 43600

  • Gradient test
  • Error data: 25 of 43600

For details of JMA's quality control procedures, please refer to this page.


Summary of QC

  • QC detected some unnatural profiles shown in 'Results of QC'.
  • Among the data that passed JMA's automated quality control procedures, some "hitting bottom" data are found in the seas around Hawaiian Islands(Refer to concerned figures) and the seas near the south coast of the United States (Refer to concerned figures). The topography used our grounded test is too rough to catch the error.
  • There were differences above 2°C between observation data and the results of assimilation at depths of between 50 and 300m in the seas between 23°N and 27°N. The observation data shows sharper thermocline better than the assimilation data.
  • With the exception of the above errors and differences, there were no significant biases in comparison with the results of assimilation by JMA.


Figures

◊Station map ◊Vertical temperature profile

Vertical profile of temperature along the observing line of PX38 moved the entire profile by 5 degree Celsius.

station map water fall
◊Vertical observation sections ◊Summary of differences (Obs. - Assim.) by depth

Dots and error bars represent the averages and root mean squares of the differences, respectively. Crosses represent the maximum/minimum differences.

observation scatter plot (summary of all station)
◊Vertical sections for the result of assimilation by MOVE-NP ◊Distribution of differences (Obs. - Assim.) by depth
result of assimilation scatter plot(depth bases)
◊Vertical sections of differences (Obs. - Assim.) ◊Distribution of differences (Obs. - Assim.) by temperature
differences (Obs. - Assim.) scatter plot (tempereture basis)