NORTHWEST SANDPIPER(VNVG), PX11
Observation period : 2022/11/6 to 2022/11/13

This page shows results for the PX11 line based on monitoring by the NORTHWEST SANDPIPER and comparison with the result of assimilation by NPR-4DVAR.

Overall statistics

Number of profilesNumber of dataAVERMSDMAXDMIND
2342260.200.664.57-2.06

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
0-50400-0.010.300.68-0.98
50-1004000.230.702.22-1.80
100-1503770.430.992.82-2.06
150-2003720.371.084.57-1.67
200-2503490.320.762.02-1.40
250-3003250.180.691.80-0.82
300-3503250.190.521.34-0.71
350-4003250.220.551.09-0.88
400-4503050.120.501.16-0.73
450-5002970.090.451.11-0.67
500-550110-0.020.370.90-0.63
550-6001100.030.330.64-0.62
600-6501100.100.290.58-0.55
650-7001070.180.260.87-0.23
700-7501000.180.220.58-0.11
750-800860.140.170.61-0.08
800-850800.130.190.54-0.26
850-900470.180.210.70-0.29
900-95010.180.000.180.18
950-10000----


Results of QC

A total of 23 profiles (770 data, reported by BATHY or TESAC) were received from the NORTHWEST SANDPIPER.
The results of JMA quality control are as follows.
  • Grounded test
  • Error data: 0 of 770

  • Position on land test
  • On land: 0 of 23

    Invalid position: 0 of 23

  • Regional range test
  • Error data (low): 0 of 770

    Error data (high): 0 of 770

  • Gradient test
  • Error data: 0 of 770

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


Summary of QC

  • QC detected no unnatural profiles.
  • At depths of between 80 and 200 m in the seas around 5°N, there were differences above 2°C between observation data and the results of assimilation. The observation data showed sharper thermocline than the assimilation data.


Figures

◊Station map ◊Vertical temperature profile

Vertical profile of temperature along the observing line of PX11 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 NPR-4DVAR ◊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)