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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 MERU(9V6535), PX05
Observation period : 2014/11/20 to 2014/12/1

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

Overall statistics

Number of profiles	Number of data	AVE	RMSD	MAXD	MIND
254	52185	0.26	0.97	14.16	-6.35

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	3925	0.05	0.79	1.55	-0.86
50-100	3925	0.21	1.14	5.26	-2.73
100-150	3925	0.14	1.13	9.31	-5.17
150-200	3925	0.03	0.97	7.81	-5.17
200-250	3925	-0.04	0.87	8.00	-4.09
250-300	3925	0.20	0.66	10.57	-1.93
300-350	3917	0.33	0.66	3.28	-2.89
350-400	3900	0.37	0.80	3.76	-1.44
400-450	3899	0.38	0.89	5.35	-3.76
450-500	3875	0.42	0.64	6.71	-1.75
500-550	1550	0.43	1.12	7.45	-1.32
550-600	1550	0.40	1.19	8.42	-4.21
600-650	1550	0.30	1.26	9.35	-6.35
650-700	1545	0.39	1.31	10.15	-6.34
700-750	1540	0.41	1.42	10.79	-0.99
750-800	1540	0.43	1.48	13.19	-0.78
800-850	1538	0.43	1.16	14.16	-0.72
850-900	1525	0.36	0.63	11.59	-0.40
900-950	684	0.36	0.53	11.62	-0.28
950-1000	20	2.77	0.62	5.70	0.73

Results of QC

A total of 254 profiles (116834 data, reported by BATHY or TESAC) were received from the SAFMARINE MERU.
The results of JMA quality control are as follows.

Grounded test

Error data: 1462 of 116834

Position on land test

On land: 0 of 254

Invalid position: 0 of 254

Regional range test

Error data (low): 2 of 116834

Error data (high): 159 of 116834

Gradient test

Error data: 246 of 116834

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, 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.
Two of the observations around 12°N are considered to be erroneous data (Refer to concerned figures).
There are large differences at depths of between 100 and 250m in the seas between equator and 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