Oceanography - chapter 7
To produce a surface current of 1.6 knots in the open ocean, a steady wind of _____ knots would be required.
80
The theoretical movement of surface water due to Ekman transport in the Northern Hemisphere is about __________
90 degrees to the right of wind direction
Of the following statements about deep-ocean currents, which is/are true? Choose all that apply.
Deep-ocean circulation is referred to as thermohaline flow. Deep-ocean currents are important regulators of global climate. Deep-ocean currents are initiated near Antarctica and in the North Atlantic Ocean, where cold,dense water sinks. Deep-ocean currents contain water with high oxygen concentrations. Deep-ocean currents transport a volume of water equal to that of 100 Amazon-size rivers.
Of the following statements about the Ekman spiral and Ekman transport, which is/aretrue? Choose all that apply.
Ekman transport is to the right of the wind direction in the Northern Hemisphere. In the deeper layers of the Ekman spiral, water can move in a direction opposite of the wind direction. Ekman transport can result in both upwelling and downwelling. The Coriolis effect causes surface waters to move at an angle relative to the wind direction.
Of the following conditions, which is/are related to strong El Niño events? Choose all that apply.
Increase in sea surface temperatures 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
Of the following gyres, which one(s) flow in a counterclockwise direction? Choose all that apply
Indian Ocean Subtropical Gyre. Northern Hemisphere Subpolar. Gyres South Atlantic Subtropical Gyre. South Pacific Subtropical Gyre
Of the following surface currents, which one(s) flow generally from west to east? Choose all that apply.
North Pacific Current. Equatorial Counter Current. West Wind Drift
Indian Ocean currents that are generated by seasonal changes in weather patterns are the __________and __________ Currents.
Somali/Southwest Monsoon
The West Wind Drift is a part of which of the following subtropical gyres? Choose all that apply.
South Atlantic Subtropical Gyre. South Pacific Subtropical Gyre. Indian Ocean Subtropical Gyre
Of the following currents, which ones are parts of the South Atlantic Subtropical Gyre? Choose all thatapply.
South Equatorial Current. Brazil Current. Benguela Current. West Wind Drift
Of the following statements about subtropical gyres, which is/are true? Choose all that apply.
The rotation of each subtropical gyre causes a "hill" of water to pile up within it. Globally, there are five subtropical gyres. The western boundary current of all subtropical gyres is intensified (it is fast, narrow, and deep). There are four main surface currents in each subtropical gyre. The centers of all subtropical gyres are associated with high atmospheric pressure.
The largest of the great ocean surface currents is the __________
West Wind Drift
Of the following locations, where would upwelling be expected to occur? Choose all that apply.
Where there is a sharp bend in a coastline. Where seamounts or tablemounts are present. In areas of diverging surface currents
During a strong El Niño event, the news media might be expected to cove
a tropical cyclone in Hawaii or Tahiti
Downwelling can result from __________.
converging surface currents
An indirect method of measuring ocean currents is the use of
radar altimeters
Records indicate that the ocean is warming faster in the Arctic polar regions than elsewhere. If that continues, a possible consequence could be
slowing of deep ocean circulation, resulting in lower oxygen levels in deep water
Of the following surface currents, which one(s) transport large volumes of warm water to higher latitudes?Choose all that apply.
the Gulf Stream. Brazil Current. Kuroshio Current
Deep ocean current movement is also known as
thermohaline flow
Warm core rings and cold core rings are associated with
western boundary currents
