Global Ocean Tides. Part X. The Fortnightly Lunar Tide (Mf) Atlas of Tidal Charts and Maps

摘要

In Part I (Schwiderski, 1978a) of this report, a unique hydrodynamical interpolation technique was introduced, extensively tested, and evaluated in order to compute partial global ocean tides in great detail and with a high degree of accuracy. This novel method has been applied to construct the fortnightly lunar (Mf) ocean tide with about the same relative accuracy of better than 5 cm anywhere in the open oceans. The resulting tidal amplitudes and phases are tabulated on a 1 degree x 1 degree grid system in an atlas of 42 degrees x 71 degrees overlapping charts covering the whole oceanic globe. A corresponding atlas of global corange and cotidal maps is included to provide the reader with a quick general overview of the major tidal phenomena. The specifying hydrodynamical parameters of the model are listed along with quoted sources of empirical tide data, and significant tidal features are explained and discussed. As expected the long-period fortnightly lunar tide (Mf) differs in structure considerably from the earlier computerd semidiurnal and diurnal ocean tides. In most areas, the oceanic that response resemblies its forcing equilibrium tide, but amphidromic points do exist in the middle northern and southern latitudes. (Author)