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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)

SAFMARINE MULANJE(VROX6), PX05
Observation period : 2016/8/5 to 2016/8/15

This page shows results for the PX05 line based on monitoring by the SAFMARINE MULANJE and comparison with the result of assimilation by MOVE-NP.

Overall statistics

Number of profiles	Number of data	AVE	RMSD	MAXD	MIND
262	53942	-0.17	0.92	9.00	-11.28

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	4172	-0.02	0.68	2.84	-3.93
50-100	4150	-0.45	0.89	4.18	-3.65
100-150	4150	-0.67	1.01	5.01	-5.63
150-200	4150	-0.63	1.04	5.05	-9.14
200-250	4138	-0.23	1.07	5.83	-11.28
250-300	4125	-0.14	0.81	3.04	-6.82
300-350	4117	-0.13	0.56	1.79	-3.05
350-400	4100	-0.13	0.49	1.88	-3.33
400-450	4100	-0.10	0.54	2.71	-3.71
450-500	4100	-0.04	0.63	3.77	-3.60
500-550	1640	0.00	0.78	4.83	-3.92
550-600	1640	-0.01	0.87	5.12	-4.15
600-650	1640	-0.01	0.94	5.80	-6.39
650-700	1640	0.03	1.07	6.82	-6.10
700-750	1640	0.08	1.15	7.73	-5.38
750-800	1634	0.14	1.18	8.17	-2.58
800-850	1618	0.23	1.29	8.59	-2.30
850-900	1148	0.34	1.52	9.00	-2.62
900-950	38	2.60	3.06	8.93	-0.26
950-1000	2	2.68	0.01	2.69	2.67

Results of QC

A total of 262 profiles (115849 data, reported by BATHY or TESAC) were received from the SAFMARINE MULANJE.
The results of JMA quality control are as follows.

Grounded test

Error data: 1760 of 115849

Position on land test

On land: 0 of 262

Invalid position: 0 of 262

Regional range test

Error data (low): 479 of 115849

Error data (high): 178 of 115849

Gradient test

Error data: 357 of 115849

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 Izu ridge (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 100 and 200m in the seas south of 10°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 PX05 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