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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)

NORTHEWEST SANDERLING(VNVZ), PX11
Observation period : 2017/1/2 to 2017/1/9

This page shows results for the PX11 line based on monitoring by the NORTHEWEST SANDERLING and comparison with the result of assimilation by MOVE-NP.

Overall statistics

Number of profiles	Number of data	AVE	RMSD	MAXD	MIND
40	5534	-0.38	2.05	3.14	-21.83

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	466	-0.66	2.32	0.65	-16.37
50-100	475	-0.97	4.57	3.14	-21.83
100-150	455	-0.79	3.76	2.64	-18.67
150-200	450	-0.50	2.25	1.92	-11.66
200-250	450	-0.20	1.02	1.14	-5.39
250-300	439	-0.05	0.53	1.26	-1.84
300-350	425	-0.16	0.79	1.22	-3.56
350-400	408	-0.27	0.78	0.84	-3.15
400-450	400	-0.36	0.67	0.41	-2.73
450-500	400	-0.33	0.61	0.50	-2.43
500-550	160	-0.27	0.57	0.56	-2.14
550-600	160	-0.25	0.54	0.55	-1.85
600-650	160	-0.23	0.53	0.52	-1.93
650-700	160	-0.12	0.41	0.57	-1.51
700-750	148	-0.12	0.41	0.60	-2.26
750-800	140	-0.03	0.28	0.34	-1.54
800-850	132	-0.06	0.42	0.43	-1.94
850-900	93	-0.10	0.55	0.54	-2.26
900-950	13	-0.53	0.87	0.32	-1.89
950-1000	0	-	-	-	-

Results of QC

A total of 40 profiles (1323 data, reported by BATHY or TESAC) were received from the NORTHEWEST SANDERLING.
The results of JMA quality control are as follows.

Grounded test

Error data: 0 of 1323

Position on land test

On land: 0 of 40

Invalid position: 0 of 40

Regional range test

Error data (low): 0 of 1323

Error data (high): 14 of 1323

Gradient test

Error data: 18 of 1323

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.
One of the observations at around 9°N is considered to be erroneous data.
There were differences above 2°C between the results of assimilation and a profile data observed at depths of between 50 and 200m in the seas south from 4°N. It's to be noted that the results of assimilation is considered to be less accurate in the marginal seas.
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 PX11 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