The Cause of Sound Speed Profile Differences between ICAPS and SIMAS. Volume I.
OCEAN DATA SYSTEMS INC ROCKVILLE MD
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This report discusses the cause of environmentally significant differences in sound speed profiles generated by ICAPS and SIMAS for eight ocean sites. The sites used for this investigation were selected from the identical sites for which profile comparisons were made and differences noted in the FY-79 APP Task II Report of 28 September 1979 by NORDA Code 321. The cause of noted differences were found to fall into four interrelated categories. First, the merge algorithms used by each system are based on different philosophies and those philosophies are reflected in the respective codes. Second, the method of selecting depth, temperature pairs from a recorded BT trace is different and these methods result in different definitions of the same BT as seen by the merge algorithm. Third, the historical profiles and the method of determining a representative historical profile for a given location and time are different. Fourth, the definition and usage of salinity in the development of the resultant sound speed profiles are different. A final category concerning human factors is discussed but no differences were found to be caused by human errors in data preparation. However, differences in data and capabilities understood to be implemented but not actually implemented as documented are identified.
- Computer Programming and Software