A diurnal constituent arising from the declination of both Moon and Sun, with a period of about 23.93 hours. With O1 it makes up most of the diurnal tide, and the two beat together over about 13.66 days to produce the tropic and equatorial cycle. Where K1 and O1 are large relative to M2 and S2, the tide becomes mixed or diurnal.
K1 and O1 together beat M2 here, that's why the Gulf gets one tide a day for half the month.
Also heard as
- lunisolar diurnal
Related terms
O1
The principal lunar diurnal constituent, period about 25.82 hours, created by the Moon's declination.
Diurnal tide
A tide with a single high water and a single low water in each lunar day.
Form factor
A ratio of diurnal to semidiurnal constituent amplitudes used to classify a tide as semidiurnal, mixed or diurnal.
Declination
The angle of the Moon or Sun north or south of the celestial equator, which makes the two daily tides unequal.
Tropic tide
A tide occurring when the Moon is near its greatest declination, giving the largest daily inequality.