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

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100m TS by NPR-4DVAR

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Ship Observations Team (SOT)

ANL WARRNAMBOOL(9HA5535), PX13
Observation period : 2022/5/16 to 2022/5/28

This page shows results for the PX13 line based on monitoring by the ANL WARRNAMBOOL and comparison with the result of assimilation by NPR-4DVAR.

Overall statistics

Number of profiles	Number of data	AVE	RMSD	MAXD	MIND
264	52372	0.15	0.56	7.11	-4.32

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	3975	0.30	0.84	6.55	-4.32
50-100	3975	0.35	0.92	7.11	-4.17
100-150	3975	0.24	1.01	4.04	-2.98
150-200	3975	0.05	0.60	2.62	-2.35
200-250	3975	0.09	0.38	1.73	-1.60
250-300	3975	0.09	0.35	1.91	-1.09
300-350	3975	0.10	0.34	1.59	-1.06
350-400	3975	0.11	0.33	1.31	-0.85
400-450	3975	0.13	0.32	1.64	-0.65
450-500	3975	0.14	0.32	2.20	-0.59
500-550	1590	0.11	0.32	2.52	-0.50
550-600	1590	0.11	0.34	2.52	-0.47
600-650	1590	0.11	0.34	2.59	-0.60
650-700	1590	0.13	0.37	2.76	-0.54
700-750	1590	0.15	0.38	3.01	-0.39
750-800	1560	0.14	0.33	3.10	-0.24
800-850	1557	0.14	0.35	3.23	-0.22
850-900	1359	0.13	0.30	3.01	-0.30
900-950	194	0.18	0.33	3.05	-0.27
950-1000	2	0.54	0.01	0.55	0.53

Results of QC

A total of 264 profiles (119122 data, reported by BATHY or TESAC) were received from the ANL WARRNAMBOOL.
The results of JMA quality control are as follows.

Grounded test

Error data: 118 of 119122

Position on land test

On land: 0 of 264

Invalid position: 0 of 264

Regional range test

Error data (low): 0 of 119122

Error data (high): 0 of 119122

Gradient test

Error data: 60 of 119122

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 the north coast of New Zealand's North Island (Refer to concerned figures 2) . The topography used for our grounded test is too rough to catch the error.
There were large differences at depths of between 30 and 60 m in the seas around 10°N. The observation data shows deeper mixed layer than the assimilation data.

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 NPR-4DVAR	◊Distribution of differences (Obs. - Assim.) by depth

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