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surface water circulation of the ocean and principal adjoini
Transcript of surface water circulation of the ocean and principal adjoini
designed by Péter Puklus for Prezi
1.the generation of gradient curent resulting from the indirect effect of wind
- The gradient current corresponds to the geostrophic wind in meteorology. In practice, the distribution of density is determined by measurements of salinity and temperature at a series of depths in a number of positions. The Equatorial Counter Current, which flows towards the east, is a partial return of water carried westward by the North and South Equatorial currents. In El Niño years, this current intensifies in the Pacific Ocean.
2. analyses the nature of current
- The major ocean currents of the tropics (I.e., the equatorial currents and counter currents) are driven by the global wind system. The geostrophic balance resulting from the coriolus force deflection and the pressure force causes the sea-surface to slop up away from the equator
3.surface water circulation to the atmospheric pressure
5.describes the seasonal changes in the above in areas under the influence of asian moonsoons
6.identifies the principal individual current by name
-The North Equatorial Current originates to the
northward of the Cape Verde Islands and flows almost due
west at an average speed of about 0.7 knot.
The South Equatorial Current is more extensive. It
starts off the west coast of Africa, south of the Gulf of
Guinea, and flows in a generally westerly direction at an
average speed of about 0.6 knot.
Pacific Ocean Currents
Indian Ocean Currents
7.analyses the causes of individual currents by name explicitly state in meteorology for mariners
- Surface currents are generated largely by wind. Their patterns are determined by wind direction, Coriolis forces from the Earth’s rotation, and the position of landforms that interact with the currents. Currents may also be generated by density differences in water masses caused by temperature and salinity variations. These currents move water masses through the deep ocean—taking nutrients, oxygen, and heat with them. Hiram ka ng libro Meteorology for Mariners!
to give a succinct view of how wind speed and direction are typically distributed at a particular location.
The modern wind rose used by meteorologists gives the percentage of the time the wind blows from each direction during the observation period; it sometimes shows the strengths of these winds and the percentage of the time calm air or light winds are observed. This wind rose usually has eight radiating lines, whose lengths are proportional to wind frequency, and shows wind strength by the thickness of the lines or by feathers attached to them. The frequency of calm or nearly calm air is given as a number in the centre.
12. Major Ocean Currents:
1- gulf stream - check out the current position of the gulf stream:
3- laborador current
7- north equatorial current
8- north equatorial. counter current
9- south equatorial current
10- south equatorial counter current
11- equatorial counter current
12- kuroshio current
14- Alaska current
16- California current
The oceanic circulation is shown on the
chart following this page (winter N. hemisphere), with the
names of the major ocean currents. Some differences in
opinion exist regarding the names and limits of some of the
currents, but those shown are representative. Speed may
vary somewhat with the season.
14. It represents the overall movements of ocean water
over a considerable period. It is good for averages readings of rate and drift, over a prolonged period, but does not give the most likely current on any particular occasion. It gives the direction by an arrow pointing towards the direction, in which the current is moving. It also gives the rate in knots and number of observations, upon which the mean chart is based.
Normally upper figure indicates rate and lower figure indicates the number of observations
15. Vector mean chart: It represents the overall movements of ocean water
over a considerable period.
Predominant current chart: It represents an approximation to most
frequent or most likely current’s rate and drift.