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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)

HORIZON SPIRIT(WFLG), PX37
Observation period : 2016/1/20 to 2016/1/25

This page shows results for the PX37 line based on monitoring by the HORIZON SPIRIT and comparison with the result of assimilation by MOVE-NP.

Overall statistics

Number of profiles	Number of data	AVE	RMSD	MAXD	MIND
100	32187	-0.04	0.62	4.52	-3.54

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	2500	-0.01	0.36	1.24	-2.65
50-100	2500	-0.18	0.64	2.88	-2.84
100-150	2500	-0.45	0.92	2.95	-3.24
150-200	2500	-0.38	0.88	2.58	-3.54
200-250	2500	-0.21	0.64	1.40	-3.13
250-300	2500	-0.06	0.51	1.37	-2.33
300-350	2500	0.06	0.45	1.82	-1.65
350-400	2500	0.11	0.43	2.08	-0.91
400-450	2491	0.12	0.44	2.16	-0.76
450-500	2425	0.09	0.39	2.07	-0.75
500-550	970	0.08	0.38	2.55	-1.01
550-600	961	0.10	0.38	2.90	-0.66
600-650	960	0.13	0.45	3.23	-0.39
650-700	951	0.15	0.49	3.54	-0.30
700-750	940	0.15	0.52	3.76	-0.31
750-800	900	0.16	0.57	4.09	-0.30
800-850	900	0.17	0.59	4.24	-0.25
850-900	639	0.21	0.75	4.44	-2.96
900-950	44	2.06	1.42	4.52	-0.15
950-1000	6	2.30	0.91	3.59	1.56

Results of QC

A total of 100 profiles (43955 data, reported by BATHY or TESAC) were received from the HORIZON SPIRIT.
The results of JMA quality control are as follows.

Grounded test

Error data: 0 of 43955

Position on land test

On land: 0 of 100

Invalid position: 0 of 100

Regional range test

Error data (low): 0 of 43955

Error data (high): 2 of 43955

Gradient test

Error data: 16 of 43955

For details 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. This is checked by the 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 near the west coast of the United States(Refer to concerned figures) and adjacent Hawaii Islands(Refer to concerned figures). The topography used our grounded test is too rough to catch the error.
There were differences above 2°C between observation data and the results of assimilation at depths of between 50 and 250m in the seas east of 138°W.
With the exception of the above errors, 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 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 MOVE-NP	◊Distribution of differences (Obs. - Assim.) by depth

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