Lunisolar semi diurnal constituent. This con- 2 stituent modulates the amplitude and frequency of M and S2 for the declinational effect of the Moon and Sun, respectively. Speed = 2T + 2h = 30.082,137,30 per solar hour
National Oceanic and Atmospheric Administration NOAA, Tide and Current Glossary, National Ocean Service, CO-OPS, Products and Services N/OPS3, Silver Spring, MD, USA 1999. http://co-ops.nos.noaa.gov/publications/glossary2. pdf, (ND/ Tide and Current - Amer) {830}