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GTSPP Data Product Centre for the North Pacific Region hosted by the Japan Meteorological Agency

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Ship Observations Team (SOT)

TACOMA TRADER(9V2401), PX40
Observation period : 2016/10/3 to 2016/10/16

This page shows results for the PX40 line based on monitoring by the TACOMA TRADER and comparison with the result of assimilation by MOVE-NP.

Overall statistics

Number of profiles	Number of data	AVE	RMSD	MAXD	MIND
190	62849	-0.15	1.25	15.33	-4.87

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 range	Number of data	AVE	RMSD	MAXD	MIND
0-50	4750	-0.05	0.58	2.00	-4.87
50-100	4750	-0.53	1.01	2.89	-4.46
100-150	4750	-0.51	0.83	3.78	-4.09
150-200	4750	-0.44	0.83	6.12	-3.36
200-250	4750	-0.27	0.91	7.83	-2.79
250-300	4750	-0.21	1.02	9.16	-2.92
300-350	4750	-0.14	1.14	10.24	-3.18
350-400	4727	-0.07	1.25	11.00	-3.23
400-450	4725	-0.04	1.34	11.64	-3.42
450-500	4725	-0.03	1.40	12.18	-3.09
500-550	1890	-0.03	1.45	12.59	-2.99
550-600	1890	-0.05	1.49	13.14	-2.58
600-650	1890	-0.05	1.51	13.68	-2.01
650-700	1890	0.01	1.53	14.12	-1.66
700-750	1885	0.05	1.56	14.47	-1.58
750-800	1880	0.12	1.56	14.75	-1.54
800-850	1880	0.20	1.57	14.89	-0.82
850-900	1849	0.24	1.60	15.09	-0.65
900-950	356	1.27	3.50	15.29	-0.36
950-1000	12	7.44	5.34	15.33	2.44

Results of QC

A total of 190 profiles (85382 data, reported by BATHY or TESAC) were received from the TACOMA TRADER.
The results of JMA quality control are as follows.

Grounded test

Error data: 0 of 85382

Position on land test

On land: 0 of 190

Invalid position: 0 of 190

Regional range test

Error data (low): 0 of 85382

Error data (high): 171 of 85382

Gradient test

Error data: 38 of 85382

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

Summary of QC

Some erroneous profiles are detected by JMA's automated quality control procedures. These are checked by the regional range test and the gradient test.
There were large differences between observation data and the results of assimilation in areas south of the Kuroshio extension (west of 150°E) due to cold and warm eddies.
Among the data that passed JMA's automated quality control procedures, some "hitting bottom" data are found in the seas southeast of Japan(Refer to concerned figures) and adjacent Hawaii Islands(Refer to concerned figures). The topography used our grounded test is too rough to catch the error.
There are large differences at depths of between 50 and 300m in the seas around 167°W. 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 PX40 moved the entire profile by 5 degree Celsius.

◊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.

◊Vertical sections for the result of assimilation by MOVE-NP	◊Distribution of differences (Obs. - Assim.) by depth

◊Vertical sections of differences (Obs. - Assim.)	◊Distribution of differences (Obs. - Assim.) by temperature