Prior to the Autosal 8400A, measurements made by Ted Walsh using the Minisal were also processed by him. However, new processing parameters and methods were developed when the group purchased and started using the Autosal 8400A for HOT-27. Currently, data from the Autosal measurement sessions are captured directly from the Autosal 8400B to the laptop hard drive using the automated data entry interface and the asal program that came with the interface. The asal program creates raw data files (raw, *.lst, *.dat) which are necessary for data processing. This method has been employed since May 2, 2000 (HOT-114), when the group started using the Autosal interface. In addition, many original processing programs were modified to work with the asal program and its output files. Besides processing programs, the most important difference between data processing before and after the interface is the method of data entry. Before the interface, data acquisition and entry were all done manually: the Autosal operator recorded the conductivity ratios onto the Salinity Measurement Sheets, and student assistants computed the averages and entered them into the computer. This method allowed for errors in data entry, caused by operator errors and confusion. Detailed procedures are described in the Salinity Data Processing Guide (Pre-asal Procedures) (Asghar et al. 1994, Appendix M).

Table 5 is a summary of changes in processing programs that occurred after the purchase of the Autosal interface:

Table 5: Changes in Salinity Data Processing Programs


Before Interface (Before HOT-114)

After Interface (HOT-114 to present)

Data acquisition

Manual entry on measurement log sheets, average salinity computed manually

Interface and the asal program used.

Data entry into a Sun computer hard drive

Manual entry into the computer, using autosal.c which outputs hot###a.log, hot###a.raw per session

Data files (raw, *.lst, *.dat) transferred through FTP, asal2dat.m reads the output of the asal program to create hot###.dat, ss###.dat, ss###.stat

Substandard statistics


pssstat.m (to work with files created by asal2dat.m)

Application of corrections

raw2dat.c creates hot###.dat

hot###.dat already created by asal2dat.m during data entry

Autosal vs. CTD plots

plotdat.m outputs

autoplot.m (same as plotdat.m but this automatically creates plots sequentially w/out prompts)

Duplicates data


duplicates.m plots primary and secondary samples to determine outliers. duplicates2.m plots duplicate-primary salinity differences with CTD data.

Data transfer to CTD processing


dat2sal.m (same as dat2sal.c, just in Matlab)

Summary report

Word processing on Open Windows, tables created by *.trf and *.tbl (troff files)

Word processing on FrameMaker5, tables created by enscription.

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