Flashcards in Tides Deck (15)
What defines spring tides?
1. highest high tides and lowest low tides in this cycle:
2. sun and moon line up to create stronger pull
What defines neap tides
1. lowest high tide and highest low tide
2. sun and moon do not line up their gravitational pulls
Three types of tides
Define semi-diurnal tides
2 highs and lows per day
Define diurnal tides
1 high and one low per day
Define mixed tides
semi-diurnal signal modulated by diurnal signal
Tidal bore: define.
a steep-fronted wave that moves up rivers as the tide increases
Define tidal currents
The horizontal motion of water during tides. It flows in and out!
what are two driving forces of oceans
Wind and drag created at the ocean surface
Differences in density between water masses
What is the primary driver of surface currents?
What is the primary driver of deep water currents?
What is the factor that drives all sorts of currents?
the transfer of heat from tropics to the poles.
Define ekman spiral
coriolis force applied to wind-driven surface currents
what causes el nino?
reductionor reversal of southeast trade winds from decrease differences between high and low pressure zones