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Oceanography Chapter 7
Oceanography questions
48
Environmental Studies
Undergraduate 4
02/24/2016

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Term
An indirect method of measuring ocean current is the use of __________.
Definition
radar altimeters
Term
A large system of rotating ocean currents, usually driven by the major wind belts, is called a(n)
Definition
gyre
Term
The current in the northwestern part of the North Atlantic Subtropical Gyre that transports warm water toward the North Atlantic is called the
Definition
Gulf Stream
Term
The loss of heat from the ocean surface, resulting in a lowered temperature, causes ocean water to become
Definition
denser
Term
A deep and powerful southward subsurface current that flows under the Gulf Stream in the North Atlantic is the
Definition
North Atlantic Deep Water
Term
Thermohaline circulation in the ocean is driven primarily by differences in __________ and __________ among water masses.
Definition
temperature; salinity
Term
To produce a surface current of 1.6 knots in the open ocean, a steady wind of _____ knots would be required.
Definition
80
Term
The actual movement of surface water due to Ekman transport in the Northern Hemisphere is about __________.
Definition
45 degrees to the right of the wind direction
Term
Of the following statements about subtropical gyres, which is/are true?
Definition
The western boundary current of all subtropical gyres is intensified (it is fast, narrow, and deep).
Globally, there are five subtropical gyres.
There are four main surface currents in each subtropical gyre
The centers of all subtropical gyres are associated with high atmospheric pressure.
The rotation of each subtropical gyre causes a "hill" of water to pile up within it.
Term
Of the following gyres, which one(s) flow in a counterclockwise direction?
Definition
Indian Ocean Subtropical Gyre, Northern Hemisphere Subpolar Gyres, South Atlantic Subtropical Gyre, South Pacific Subtropical Gyre
Term
Of the following surface currents, which one(s) flow from south to north?
Definition
Peru Current

Kuroshio Current

the Gulf Stream
Term
Of the following surface currents, which one(s) flow generally from west to east?
Definition
West Wind Drift, Equatorial Counter Current,
North Pacific Current
Term
The West Wind Drift (Antarctic Circumpolar Current) is a part of which of the following subtropical gyres?
Definition
South Pacific Subtropical Gyre

Indian Ocean Subtropical Gyre

South Atlantic Subtropical Gyre
Term
Of the following statements about Ekman spiral and Ekman transport, which is/are true?
Definition
-within the ekman spiral, deeper water can move in a direction exactly opposite of the wind direction
-The two factors that affect the ekman spiral are the wind direction and the Coriolis effect
-because of the coriolis effect, surface waters move at an angle to the wind direction
-connecting the arrows of water movement from the surface into deeper waters shows the spiral pattern
-ekman transport is to the right of the wind direction in the northern hemisphere
Term
Of the following currents, which ones are parts of the South Atlantic Subtropical Gyre?
Definition
Benguela Current

West Wind Drift

South Equatorial Current

Brazil Current
Term
Downwelling can result from
Definition
converging surface currents
Term
Of the following locations, where would upwelling be expected to occur?
Definition
-where there is a sharp bend in a coastline
-where there is a shallowly submerged sea floor obstruction, such as a tablemount
-in areas of diverging surface currents,such as along the equator
-in areas of offshore winds
Term
The thermocline is _________________.
Definition
a steep temperature gradient in the ocean that separates deeper cold water from warmer upper water
Term
What is the Walker Circulation Cell?
Definition
It is the path that air takes as it moves from high to low pressure, and back to high pressure, in the South Pacific under normal conditions.
Term
Why does upwelling occur along the west coast of South America under normal conditions?
Definition
Winds moving westward in the South Pacific drive ocean currents toward the west; deep water rises to replace water driven westward.
Term
What would you expect weather to be like on the eastern coast of Australia if the western coast of South America were experiencing unusually warm, wet weather?
Definition
What would you expect weather to be like on the eastern coast of Australia if the western coast of South America were experiencing unusually warm, wet weather?
The eastern coast of Australia would be experiencing unusually dry weather.
The eastern coast of Australia would be experiencing unusually wet weather.
The eastern coast of Australia would be experiencing unusually cool weather.
The eastern coast of Australia would be experiencing unusually warm weather. The eastern coast of Australia would be experiencing unusually dry weather.
Term
Which direction do ocean currents in the South Pacific move under El Niño conditions?
Definition
Eastward
Term
What is the Southern Oscillation?
Definition
What is the Southern Oscillation?
Term
Under which conditions are droughts and wildfires common in Australia?
Definition
under El Nino conditions
Term
What is the overall effect of the stronger than normal trade winds typical of La Niña conditions?
Definition
lowering of the South Pacific ocean temperature from normal conditions
Term
One of the world’s most powerful currents, located off the east coast of the United States, is the
Definition
Gulf Stream
Term
The Gulf Stream transports warm water into the
Definition
North Atlantic
Term
Fluctuations in the flow of the Gulf Stream current result in curving loops of water known as
Definition
meanders
Term
Ocean frontal systems that spin off from currents such as the Gulf Stream, akin to atmospheric storms, are known as
Definition
eddies
Term
When a meander from the Gulf Stream pinches off into the warm water south of the current, the eddy is called a
Definition
cold-core eddy or ring
Term
The largest of the great ocean surface currents is the
Definition
West Wind Drift
Term
Warm core rings and cold core rings are associated with
Definition
western boundary currents
Term
Indian Ocean currents that are generated by seasonal changes in weather patterns are the __________ and __________ Currents.
Definition
Somali/Southwest Monsoon
Term
During a strong El Nino event, the news media might be expected to cover
Definition
a tropical cyclone in Hawaii or Tahiti
Term
Of the following conditions, which is/are related to strong El Niño events?
Definition
-increase in sea surface temp. and destruction of coral reefs in the eastern pacific ocean
-higher sea levels in the eastern pacific ocean associated with warmer water
-increased abundance of hurricanes in the eastern pacific ocean
Term
Deep ocean current movement is also known as
Definition
thermohaline flow
Term
Records indicate that the ocean is warming faster in the Arctic polar regions than elsewhere. If that continues, a possible consequence could be
Definition
slowing of deep ocean circulation, resulting in lower oxygen levels in deep water
Term
Of the following statements about deep-ocean currents, which is/are true?
Definition
-Deep-ocean currents contain water that is high in oxygen.
-Deep-ocean circulation is often referred to as thermohaline flow.
-The volume of water involved in the downward movement of deep-ocean currents is equal to the flow of 100 Amazon-sized rivers.
-Deep-ocean currents are important regulators of global climate.
-Deep-ocean currents are initiated by downwelling of cold, dense water near Antarctica and in the North Atlantic Ocean. (deep ocean currents often travel faster than surface currents)
Term
The coastlines with the greatest tsunami hazard are most commonly associated with what type of plate boundary?
Definition
convergent
Term
Which of the following statements about earthquakes and tsunami hazards is most accurate?
Definition
A relatively high number of earthquakes and the greatest tsunami hazard occur along the western coast of South America.
Term
Which of the following statements is most accurate about tsunami hazards and the number of people at risk?
Definition
A low tsunami hazard and a high number of people at risk are present along the coast of the eastern United States.
Term
Which body of water is shown to have the greatest amount of coastal pollution?
Definition
Baltic Sea
Term
Surface ocean currents ___.
Definition
form large rotating gyres in the major ocean basins
are driven by winds
are influenced by Coriolis effect
Term
Equatorial currents that are part of the subtropical gyres flow ___. Equatorial counter currents between the gyres flow ___ .
Definition
east-to-west; west-to-east
Term
Warm ocean currents ___.
Definition
are warming than the surrounding water
Term
Cool ocean currents ___.
Definition
generally flow from high latitudes towards the equator
Term
The subtropical gyres ___.
Definition
play a large role in climate
Term
Deep ocean currents ___.
Definition
Deep ocean currents ___.
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