OCEANOGRAPHY CH 9

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How long does an ENSO event typically last?​

1 year

How much of the water in the world ocean is involved in surface currents?

10%

What is the residence time of most deep waters?

200 to 300 years

What describes the theoretical direction of Ekman transport in the Southern Hemisphere?​

90° to the left of wind direction

What water mass is the densest in the world ocean?

Antarctic Bottom Water

The boundary between which two water masses in tropical latitudes is the most pronounced and abrupt?​

Central water and intermediate water

​_____ currents flow equatorward and are shallow and broad.

Eastern boundary

​The "hill" of water that occurs as a result of westward intensification due to the Coriolis effect is formed by _____.

Ekman transport

What is true about the Coriolis effect?

It is absent at the equator

​What is true of density, salinity, and temperature?

Many combinations of temperature and salinity can yield the same density.

What water mass is the most saline in the world ocean?

Mediterranean Deep Water

Equatorial upwelling occurs worldwide, but where is it most pronounced?

Pacific Ocean

Who was the first to record the observation of currents?

Pytheas

Equatorial upwelling occurs in what current?​

South Equatorial Current

What changes are caused by the Southern Oscillation in the Pacific Ocean?​

Trade winds blow from west to east.

What can be caused by ENSO events in the eastern Pacific?

Upwelled water is nutrient-depleted, causing loss of productivity.

What is the largest current?

West Wind Drift

The centers of gyres tend to be ____.

calm and support relatively little life

What current is associated with upwelling?

eastern boundary currents

Downwelling can have direct effects on the climate of an adjacent coast.

false

During major ENSO events, sea level rises in the western Pacific and water temperatures also increase.

false

Langmuir circulation consists of slowly twisting cells of windows, or convergences where seaweed, debris, and foam accumulate, that operates in the surface layer, as well as below the pycnocline

false

Surface currents flow vertically in the uppermost 400 meters of the water column.​

false

The Ekman spiral is similar to an eddy in that the water spirals downward like a whirlpool.​

false

The Pacific's Equatorial Currents are driven eastward by westerly winds and flow faster than the westward flowing currents driven by the trades.

false

Western boundary currents move cold water poleward in each of the gyres.​

false

​The flow of water around the periphery of an ocean basin driven by winds and the Coriolis effect is called a(n) ____.

gyre

​The transport of heat and energy by surface currents throughout the ocean can have influences on climate and weather. Where does the greatest amount of heat transfer by surface currents occur?

mid-latitudes

Which currents are the slow, deep currents that affect seawater beneath the pycnocline?​

thermohaline

The trade winds and westerlies drive what geostrophic currents?

transverse currents

Countercurrents are also known as undercurrents.​

true

During a non-El Niño year, the air and surface water flow westward to the western Pacific, the thermocline rises, and upwelling of cold water occurs along the west coast of Central and South America.​

true

Gyres tend to collect seaweed and trash as their centers.

true

Sir John Murray observed that the temperature of the ocean's surface water was almost always higher than the temperature of deep water.

true

Surface currents distribute tropical heat worldwide. The winters in Scotland, Ireland, and England are relatively mild due to the energy transported by the North Atlantic Current and the Gulf Stream.​

true

The North Atlantic Intermediate Water and the Antarctic Intermediate Water are both produced by caballing

true

The westward intensification is driven by the Coriolis effect.​

true

​Recent research suggests that warm- and cold-core eddies may be responsible for slowly moving abyssal storms, which leave ripple marks in deep sediments.

true

The Gulf Stream is the largest of what type of current?

western boundary currents

The fastest and deepest geostrophic currents are ____.​

western boundary currents

What currents carry the highest volume of water?

western boundary currents

Surface currents are driven mainly by ____.

wind friction

Which is an example of coastal upwelling affecting weather onshore?

​Cold water is brought to the surface that chills the air above, inducing cool, wet weather.

Wind-induced vertical circulation is also known as ____.

​Upwelling/downwelling

Langmuir circulation occurs only ____.

​in the top 20 meters of water


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