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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)

MAERSK LOME(V7GQ8), PX05
Observation period : 2017/10/29 to 2017/11/7

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

Overall statistics

Number of profiles	Number of data	AVE	RMSD	MAXD	MIND
261	53955	-0.04	1.25	12.99	-6.44

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	4150	0.09	0.35	2.43	-3.05
50-100	4150	-0.34	0.80	4.14	-4.23
100-150	4150	-0.25	1.24	5.80	-6.44
150-200	4150	-0.35	1.14	5.71	-6.09
200-250	4150	-0.23	0.97	3.84	-4.98
250-300	4150	-0.11	0.95	6.29	-3.17
300-350	4142	-0.11	1.10	8.39	-4.81
350-400	4125	-0.09	1.22	9.21	-3.86
400-450	4125	0.00	1.34	10.54	-2.36
450-500	4125	0.12	1.44	11.16	-2.38
500-550	1650	0.14	1.46	11.31	-1.87
550-600	1650	0.12	1.47	11.75	-2.07
600-650	1650	0.14	1.47	12.09	-2.04
650-700	1650	0.20	1.46	12.25	-1.68
700-750	1650	0.26	1.46	12.46	-1.75
750-800	1650	0.28	1.47	12.61	-1.97
800-850	1642	0.32	1.50	12.75	-0.87
850-900	949	0.53	1.95	12.86	-0.86
900-950	43	6.35	5.38	12.97	-1.76
950-1000	4	11.69	1.29	12.99	10.40

Results of QC

A total of 261 profiles (114823 data, reported by BATHY or TESAC) were received from the MAERSK LOME.
The results of JMA quality control are as follows.

Grounded test

Error data: 1906 of 114823

Position on land test

On land: 0 of 261

Invalid position: 0 of 261

Regional range test

Error data (low): 0 of 114823

Error data (high): 17 of 114823

Gradient test

Error data: 15 of 114823

For details of JMA's quality control procedures, please refer to this page.

Summary of QC

QC detected some unnatural profiles shown in 'Results of QC'.
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 350m in the seas south of 10°N. The observation data shows sharper thermocline better than the assimilation data.
There are differences above 2°C between observation data and the results of assimilation at depths of between 350 and 600m around 20°N.
With the exception of the above errors and differences, there are 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