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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)

E.R. WILHELMSHAVEN(ELZY3), PX09
Observation period : 2015/11/8 to 2015/11/18

This page shows results for the PX09 line based on monitoring by the E.R. WILHELMSHAVEN and comparison with the result of assimilation by MOVE-NP.

Overall statistics

Number of profiles	Number of data	AVE	RMSD	MAXD	MIND
212	33326	-0.08	0.78	4.21	-6.60

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	2550	-0.21	0.82	1.68	-6.60
50-100	2550	-0.49	1.41	2.54	-6.57
100-150	2550	-0.33	1.33	3.68	-5.55
150-200	2550	-0.18	1.23	4.21	-4.28
200-250	2550	-0.16	0.63	2.07	-2.53
250-300	2550	-0.06	0.47	1.38	-2.42
300-350	2550	-0.04	0.38	0.86	-1.83
350-400	2540	0.00	0.33	0.73	-1.62
400-450	2525	0.03	0.31	0.82	-0.96
450-500	2525	0.02	0.27	0.82	-0.85
500-550	1010	0.05	0.26	1.08	-0.84
550-600	1010	0.08	0.29	1.45	-0.82
600-650	1010	0.09	0.33	2.01	-0.79
650-700	1010	0.09	0.36	1.91	-0.67
700-750	1010	0.11	0.39	2.09	-0.57
750-800	1010	0.13	0.41	2.20	-0.48
800-850	1010	0.16	0.44	2.34	-0.41
850-900	723	0.20	0.52	2.50	-0.38
900-950	85	1.10	1.15	2.69	-0.25
950-1000	8	2.38	0.22	2.72	2.08

Results of QC

A total of 212 profiles (94762 data, reported by BATHY or TESAC) were received from the E.R. WILHELMSHAVEN.
The results of JMA quality control are as follows.

Grounded test

Error data: 190 of 94762

Position on land test

On land: 0 of 212

Invalid position: 0 of 212

Regional range test

Error data (low): 0 of 94762

Error data (high): 83 of 94762

Gradient test

Error data: 118 of 94762

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. These are checked by the grounded test, 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 around Hawaiian Islands(Refer to concerned figures). The topography used our grounded test is too rough to catch the error.
There are large differences at depths of upper 200m. The observation data shows sharper thermocline better than the assimilation data.
With the exception of the above errors and differences, 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 PX09 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