GTSPP Data Product Centre

GTSPP Data Product Centre for the North Pacific Region hosted by the Japan Meteorological Agency

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The last 30 days SOOP observation

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100m TS by NPR-4DVAR

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Ship Observations Team (SOT)

HORIZON ENTERPRISE(KRGB, ZLV5CGB), PX37
Observation period : 2023/5/20 to 2023/5/25

This page shows results for the PX37 line based on monitoring by the HORIZON ENTERPRISE and comparison with the result of assimilation by NPR-4DVAR.

Overall statistics

Number of profiles	Number of data	AVE	RMSD	MAXD	MIND
89	28832	0.08	0.48	4.97	-2.99

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	2225	-0.14	0.65	1.73	-2.99
50-100	2225	0.05	0.58	2.58	-2.70
100-150	2225	0.03	0.54	2.31	-1.72
150-200	2225	0.13	0.66	3.81	-1.85
200-250	2220	0.16	0.77	4.97	-1.80
250-300	2200	0.04	0.38	1.43	-1.28
300-350	2200	0.07	0.25	0.90	-0.76
350-400	2200	0.10	0.24	1.32	-0.61
400-450	2200	0.12	0.28	1.73	-0.58
450-500	2200	0.11	0.29	2.12	-0.41
500-550	880	0.09	0.32	2.48	-0.44
550-600	840	0.10	0.37	2.83	-0.44
600-650	840	0.11	0.41	3.12	-0.35
650-700	840	0.12	0.44	3.31	-0.36
700-750	840	0.12	0.46	3.44	-0.44
750-800	810	0.11	0.40	3.53	-0.34
800-850	798	0.10	0.33	3.57	-0.36
850-900	738	0.09	0.15	0.92	-0.15
900-950	126	0.16	0.22	0.97	-0.10
950-1000	0	-	-	-	-

Results of QC

A total of 89 profiles (40200 data, reported by BATHY or TESAC) were received from the HORIZON ENTERPRISE.
The results of JMA quality control are as follows.

Grounded test

Error data: 0 of 40200

Position on land test

On land: 0 of 89

Invalid position: 0 of 89

Regional range test

Error data (low): 0 of 40200

Error data (high): 0 of 40200

Gradient test

Error data: 4 of 40200

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 QC, some "hitting bottom" data were found in the seas near the west coast of the United States (Refer to concerned figures 1) and between Oahu and Molokai (Refer to concerned figures 2) . The topography used for our grounded test is too rough to catch the error.
At the depths between 180 m and 240 m in the seas around 145°W, there were differences above 2°C between observation data and the results of assimilation.

Figures

◊Station map	◊Vertical temperature profile Vertical profile of temperature along the observing line of PX37 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 NPR-4DVAR	◊Distribution of differences (Obs. - Assim.) by depth

◊Vertical sections of differences (Obs. - Assim.)	◊Distribution of differences (Obs. - Assim.) by temperature