DEPTH OF THE MOTIONLESS LAYER IN THE GULF OF MEXICO
1954
Adams, Richard M.
A comparison was made of the methods of Defant and Hidaka for determining the motionless-layer depth. Data used in the study were collected during 3 cruises; stations were normally placed at 40-mi intervals over the entire Gulf of Mexico except in the Straits of Florida and the Yucatan Channel where the intervals were 20 mi. Defant's method utilizes the anomaly of the dynamic depth interval between isobaric surfaces; surfaces of no motion are assumed to lie somewhere within constant depth intervals. Hidaka's method is based on the distribution of salinity in sea water. Both methods reveal 2 maxima, but they differ from each other in location and magnitude. In 1936 Dietrich employed an oxygen method which inferred depth from the minimum oxygen content. Dietrich's charts also showed 2 maxima close to the positions of the maxima obtained by Defant, but the magnitudes differed.
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