oscan Motion (10 points) the diagram below, answer the following: 90 180 0 90 60
ID: 117498 • Letter: O
Question
oscan Motion (10 points) the diagram below, answer the following: 90 180 0 90 60 60 15 . 30 30 7 11 .0 10. 30- -30 17 60- - 60 0 90 Longitude 90 180 a) Write one number that is located over a cold current associated with a gyre. b) Write one number that is located over a region of deep water formation with c) Write one number representing a region where upwelling occurs that is NOT -(2 points) respec t to the thermohaline circulation. (2 points) located over a western or eastern boundary current. (2 points) d) Explain why oceanic gyres in the subtropics spin clockwise (counterclockwise) in the Northern (Southern) Hemisphere. (4 points)Explanation / Answer
a) Number 17 is located over a cold ocean current associated with a gyre.
Oceanic gyres are associated with circulating ocean currents and wind movements; they are caused by the Coriolis force.
b) Number 18 is located over a region of deep water formation with respect to thermohaline circulation.
Surface heat and freshwater fluxes are responsible for density gradients which in turn causes the oceanic circulations of which thermohaline circulation is a part. Thermohaline can be broadly described as the effects of temperature (thermo) and haline (salt content). Thus, density of sea water and the density gradients are enumerated. Thermohaline circulation can be correlated to the oceanic conveyer belt. It regulates the temperature, nutrient flow and salinity in the oceans.
c) Number 22 represents a region where upwelling occurs. Upwelling refers to the motion of nutrient-rich sea water towards an ocean surface. The former is denser and cooler. The motion is administered by wind.
d) The oceanic gyre move in a clockwise motion in the Northern Hemispohere and in an anticlockwise motion in the Southern Hemisphere. This is beacuse of the Earth's rotational motion which is one of the driving forces behind the formation of oceanic gyres. The Coriolis force, which is an inertial force, produces the Coriolis effect which causes such a phenomenon.
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