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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 : 2019/1/11 to 2019/1/21

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
257	51494	-0.04	0.75	7.85	-4.61

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	4001	0.11	0.35	2.23	-2.28
50-100	3975	-0.09	0.79	3.13	-4.29
100-150	3975	-0.20	0.97	2.87	-4.04
150-200	3975	-0.12	1.01	3.30	-4.59
200-250	3966	-0.22	0.95	2.96	-4.61
250-300	3950	-0.18	0.58	3.29	-2.33
300-350	3950	-0.04	0.51	2.33	-1.54
350-400	3950	0.03	0.56	3.55	-1.80
400-450	3950	0.04	0.68	5.08	-2.50
450-500	3950	0.03	0.84	6.77	-3.10
500-550	1580	0.02	0.99	7.85	-3.20
550-600	1569	-0.06	0.86	6.80	-3.07
600-650	1559	-0.05	0.73	6.67	-3.17
650-700	1550	-0.04	0.52	2.57	-2.30
700-750	1550	0.02	0.50	3.23	-1.79
750-800	1542	0.10	0.52	3.77	-1.49
800-850	1511	0.16	0.56	4.14	-1.47
850-900	977	0.20	0.59	4.42	-1.08
900-950	14	0.38	0.37	1.63	0.08
950-1000	0	-	-	-	-

Results of QC

A total of 257 profiles (113555 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: 1455 of 113555

Position on land test

On land: 0 of 257

Invalid position: 0 of 257

Regional range test

Error data (low): 0 of 113555

Error data (high): 186 of 113555

Gradient test

Error data: 236 of 113555

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 at depths of between 50 and 300 m. The observation data shows sharper thermocline better 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