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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 : 2018/10/13 to 2018/10/22

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
234	45954	0.05	1.08	13.54	-4.38

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	3550	-0.10	0.50	5.23	-2.77
50-100	3550	-0.03	0.78	2.60	-4.38
100-150	3550	0.07	0.92	3.40	-4.09
150-200	3550	-0.05	1.12	6.39	-3.82
200-250	3550	-0.10	1.02	6.28	-3.52
250-300	3550	0.02	1.00	7.77	-3.00
300-350	3542	0.12	0.99	8.90	-2.93
350-400	3525	0.05	1.04	9.84	-2.97
400-450	3525	0.02	1.06	10.66	-2.30
450-500	3525	0.07	1.10	11.36	-2.21
500-550	1410	0.09	1.14	11.81	-2.35
550-600	1410	0.07	1.18	12.09	-2.44
600-650	1410	0.09	1.19	12.42	-2.32
650-700	1410	0.13	1.25	12.74	-1.84
700-750	1410	0.21	1.30	13.03	-1.30
750-800	1410	0.25	1.35	13.28	-1.21
800-850	1401	0.25	1.35	13.38	-1.06
850-900	660	0.43	1.90	13.50	-0.79
900-950	14	10.79	4.47	13.52	1.46
950-1000	2	13.53	0.01	13.54	13.53

Results of QC

A total of 234 profiles (102410 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: 2198 of 102410

Position on land test

On land: 0 of 234

Invalid position: 0 of 234

Regional range test

Error data (low): 0 of 102410

Error data (high): 79 of 102410

Gradient test

Error data: 49 of 102410

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'.
There are large differences in the seas around 5°N. The observation data shows sharper thermocline than the assimilation data.
Among the data that passed JMA's automated quality control procedures, some "hitting bottom" data were found in the seas around Izu ridge (Refer to concerned figures). The topography used for our grounded test was too rough to catch the error.

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