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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)

CAP PASADO(V2DV4), PX09
Observation period : 2017/2/12 to 2017/2/22

This page shows results for the PX09 line based on monitoring by the CAP PASADO and comparison with the result of assimilation by MOVE-NP.

Overall statistics

Number of profiles	Number of data	AVE	RMSD	MAXD	MIND
214	34543	-0.08	0.78	6.99	-5.74

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	2625	-0.02	0.27	0.65	-0.87
50-100	2625	-0.27	0.85	3.94	-5.74
100-150	2625	-0.71	1.32	4.34	-4.75
150-200	2625	-0.66	1.22	3.83	-4.32
200-250	2625	-0.20	0.67	2.05	-2.69
250-300	2625	0.07	0.46	2.56	-1.76
300-350	2625	0.06	0.36	2.49	-1.44
350-400	2625	0.04	0.30	1.49	-1.12
400-450	2625	0.03	0.36	3.17	-0.90
450-500	2625	0.04	0.43	3.85	-0.86
500-550	1050	0.05	0.48	4.73	-0.67
550-600	1050	0.11	0.49	5.01	-0.41
600-650	1050	0.16	0.59	5.82	-0.37
650-700	1050	0.16	0.60	5.96	-0.30
700-750	1050	0.19	0.62	5.79	-0.26
750-800	1050	0.21	0.72	6.74	-0.26
800-850	1050	0.24	0.77	6.99	-0.27
850-900	839	0.26	0.80	6.87	-0.36
900-950	92	1.92	1.90	6.61	-0.05
950-1000	12	3.01	1.53	5.98	1.14

Results of QC

A total of 214 profiles (95802 data, reported by BATHY or TESAC) were received from the CAP PASADO.
The results of JMA quality control are as follows.

Grounded test

Error data: 190 of 95802

Position on land test

On land: 0 of 214

Invalid position: 0 of 214

Regional range test

Error data (low): 0 of 95802

Error data (high): 30 of 95802

Gradient test

Error data: 43 of 95802

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 grounded test, regional range test and the gradient test. The main cause will be "hitting bottom" of XBT.
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). The topography used our grounded test is too rough to catch the error.
There are large differences at depths of between 50 and 200m in the seas south of 15°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 PX09 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