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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), PX13
Observation period : 2016/1/5 to 2016/1/21

This page shows results for the PX13 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
325	67815	-0.26	0.86	6.71	-8.50

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	5324	0.04	0.35	2.16	-2.10
50-100	5300	-0.30	1.17	3.07	-7.21
100-150	5268	-0.62	1.58	6.20	-8.50
150-200	5183	-0.99	1.61	6.71	-8.29
200-250	5130	-0.57	0.94	1.65	-5.26
250-300	5125	-0.30	0.61	1.03	-3.84
300-350	5125	-0.20	0.41	0.74	-1.95
350-400	5125	-0.15	0.33	0.96	-1.24
400-450	5125	-0.13	0.31	1.07	-1.22
450-500	5125	-0.13	0.30	1.15	-1.35
500-550	2050	-0.09	0.26	1.05	-1.08
550-600	2050	-0.06	0.23	0.93	-1.44
600-650	2032	-0.05	0.22	1.07	-0.97
650-700	2024	-0.03	0.21	1.34	-0.93
700-750	2020	-0.01	0.20	1.34	-0.76
750-800	2006	-0.01	0.19	1.45	-0.71
800-850	1973	0.00	0.19	1.60	-0.59
850-900	1696	0.01	0.19	1.55	-0.56
900-950	134	0.22	0.81	4.56	-0.48
950-1000	0	-	-	-	-

Results of QC

A total of 325 profiles (146824 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: 1879 of 146824

Position on land test

On land: 0 of 325

Invalid position: 0 of 325

Regional range test

Error data (low): 2 of 146824

Error data (high): 94 of 146824

Gradient test

Error data: 459 of 146824

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 regional range test and the gradient test. The main cause will be "exceeding the guaranteed depth of observation" of XBT.
There are large differences at depths of between 100 and 300m in the seas south from 20°N. 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 PX13 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