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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)

Mell Springwood(V2FE8), PX44
Observation period : 2014/7/11 to 2014/7/17

This page shows results for the PX44 line based on monitoring by the Mell Springwood and comparison with the result of assimilation by MOVE-NP.

Overall statistics

Number of profiles	Number of data	AVE	RMSD	MAXD	MIND
138	45026	0.38	2.06	17.96	-3.53

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	3450	-0.33	1.00	1.91	-3.00
50-100	3450	0.08	0.94	3.00	-3.53
100-150	3450	-0.13	1.10	3.82	-3.46
150-200	3450	-0.03	1.35	7.40	-3.22
200-250	3450	0.12	1.58	10.01	-2.35
250-300	3450	0.27	1.83	11.70	-2.26
300-350	3450	0.45	2.12	13.17	-2.42
350-400	3450	0.62	2.44	14.42	-3.31
400-450	3450	0.63	2.76	15.61	-2.78
450-500	3450	0.68	1.92	16.64	-2.15
500-550	1380	0.77	3.32	17.41	-1.78
550-600	1380	0.84	2.25	17.90	-1.88
600-650	1335	0.43	2.16	17.96	-1.99
650-700	1330	0.49	2.27	11.98	-1.71
700-750	1330	0.62	2.39	12.26	-1.20
750-800	1330	0.74	2.45	12.91	-0.97
800-850	1314	0.81	2.24	13.54	-2.04
850-900	854	0.98	2.72	14.10	-0.74
900-950	141	5.33	4.74	14.40	-0.54
950-1000	120	6.55	1.57	14.67	0.50

Results of QC

A total of 138 profiles (61711 data, reported by BATHY or TESAC) were received from the Mell Springwood.
The results of JMA quality control are as follows.

Grounded test

Error data: 442 of 61711

Position on land test

On land: 0 of 138

Invalid position: 0 of 138

Regional range test

Error data (low): 0 of 61711

Error data (high): 634 of 61711

Gradient test

Error data: 16 of 61711

For datails 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, the regional range test and the gradient test, but the true cause will be, "hitting bottom" or "exceeding the guaranteed depth of observation" of XBT.
Among the data that passed JMA's automated quality control procedures, some "hitting bottom" data are found in the seas south of Taiwan (Refer to concerned figures) and adjacent the Ryukyu Chain (Refer to concerned figures). The topography used our grounded test is too rough to catch the error.
One of the observations at around 128°E is considered to be erroneous data.
With the exception of the above errors, there was no significant bias in comparison with the results of assimilation by JMA.

Figures

◊Station map	◊Vertical temperature profile Vertical profile of temperature along the observing line of PX44 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