Abstract
In two recent papers, the frequency of separation of rings from the Loop Current in the Gulf of Mexico was studied; the authors used similar data but obtained remarkably different results for the primary rate of ring shedding. In this paper the time between successive rings for the last 22 known ring events since 1973 are examined. Using a histogramlike technique that does not involve a surrogate variable but deals directly with the ring events themselves, two primary modes are found. The one at a period near 8–9 mo has slightly (but not significantly) more power than the one near 13–14 mo. The uncertainty in the periods of these peaks is estimated to be ∼0.3 mo from measurement uncertainties and an additional ∼0.3 mo from the natural variability of the process. If the high resolution available from a 20-year record were not maintained, it would be possible to smooth the present result heavily (in frequency space) and obtain the ∼11 mo peak reported by Maul and Yukovich.