The frequencies in % are plotted against the selected salinity values in Fig.8. The distribution pattern may be classiffied into 3 groups as shown in the figure. The region of the occurrence of these 3 groups are illustrated in Fig.7. The important characteristics of the distribution patterns are that the all of the curves in Fig.8 have tendency to reach to almost zero value near the salinity value a little larger than 34.90. Presumably, the ordinary salinity value in this region would be smaller than, say, 34.92. However, small but significant occurrence frequency can be seen up to the salinity value a little larger than 35.00. Judging from this distribution nature, we may set two kinds of salinity parameter, 34.92 and 35.02 for this region. If the observed salinity exceeds 35.02, the data would be erroneous, while, if the value exceeds 34.92, it night be real, but it is worth to be checked with original records or original field note.
4. Concluding remarks
We are analyzing the distribution patterns of temperature and salinity values in the seas around Japan in order to classify into several sub-regions according to the distribution patters, and to set suitable range parameters applicable for each sub-regions. It should be noted that the parameters should be determined in several manners: for example, if the reported value exceeds one parameter value, it would be error. However, another criterion of the parameter is that, if the reported data exceeds it, re-analysis of the observed data is recommended.
Reference
Morikawa, Y., J. Takeuchi, T. Uema, T. Imoto, and Y. Nagata (1997): J. Oceanogr 53, 633-643.
