What Is The Dominant Pattern Of Surface Circulation


What Is The Dominant Pattern Of Surface Circulation?

The dominant pattern of surface circulation is the gyre–a wellorganized roughly circular flow. … These gyres are made up of currents set in motion by winds and gravity and steered by the placement of the continents and the rotation of the Earth. Wind is the most important cause of surface currents.

What are surface circulation patterns?

Patterns of surface currents are determined by wind direction Coriolis forces from the Earth’s rotation and the position of landforms that interact with the currents. Surface wind-driven currents generate upwelling currents in conjunction with landforms creating deepwater currents.

What pattern do surface currents follow?

The Coriolis effect bends the direction of surface currents to the right in the Northern Hemisphere and left in the Southern Hemisphere. The Coriolis effect causes winds and currents to form circular patterns. The direction that they spin depends on the hemisphere that they are in.

What are the major patterns of ocean circulation on the planet?

The three main patterns of ocean circulation are gyres upwelling and thermohaline circulation.

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What is surface circulation?

Surface circulation carries the warm upper waters poleward from the tropics. Heat is disbursed along the way from the waters to the atmosphere. At the poles the water is further cooled during winter and sinks to the deep ocean. This is especially true in the North Atlantic and along Antarctica.

Where are Hadley cells located?

the equator
Hadley cells exist on either side of the equator. Each cell encircles the globe latitudinally and acts to transport energy from the equator to about the 30th latitude. The circulation exhibits the following phenomena: Warm moist air converging near the equator causes heavy precipitation.

How many Hadley cells are there?

Currently there are three distinct wind cells – Hadley Cells Ferrel Cells and Polar Cells – that divide the troposphere into regions of essentially closed wind circulations. In this arrangement heat from the equator generally sinks around 30° latitude where the Hadley Cells end.

How does thermohaline circulation differ from surface wind driven circulation?

thermohaline circulation

Wind-driven circulation which is strongest in the surface layer of the ocean is the more vigorous of the two and is configured as large gyres that dominate an ocean region. In contrast thermohaline circulation is much slower with a typical speed of 1 centimetre (0.4…

How does the circulation of the atmosphere affect the circulation of the surface currents?

Because the Earth rotates on its axis circulating air is deflected toward the right in the Northern Hemisphere and toward the left in the Southern Hemisphere. This deflection is called the Coriolis effect. Click the image for a larger view. Coastal currents are affected by local winds.

What is the connection between the global wind pattern and the ocean circulation patterns?

Large global wind systems are created by the uneven heating of the Earth’s surface. These global wind systems in turn drive the oceans’ surface currents.

What is the pattern of major ocean currents and what drives them?

Winds water density and tides all drive ocean currents. Coastal and sea floor features influence their location direction and speed. Earth’s rotation results in the Coriolis effect which also influences ocean currents.

In what ways are atmospheric and oceanic circulation patterns different?

How are they different? They are similar because they both move by the Earth’s rotation and heating causes currents in both patterns. They are different because in the atmosphere there are winds and cells and in the ocean there are hot/cold currents and upwellings.

How might the pattern of Earth’s surface currents change if the earth had no landmasses?

Without land masses there would be a uniform ocean movement from west to east at intermediate latitudes and from east to west near the equator and at the poles.

What is the dominant driver of circulation in the surface ocean?

surface winds

The circulation of the surface ocean is driven primarily by surface winds. As we have seen winds blow from areas of high atmospheric pressure to regions of low atmospheric pressure.

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What factors determine the movement of surface currents?

Surface currents are controlled by three factors: global winds the Coriolis effect and continental deflections. surface create surface currents in the ocean. Different winds cause currents to flow in different directions. objects from a straight path due to the Earth’s rotation.

What is the thermohaline conveyor?

thermohaline circulation also called Global Ocean Conveyor or Great Ocean Conveyor Belt the component of general oceanic circulation controlled by horizontal differences in temperature and salinity. … The general circulation of the oceans consists primarily of wind-driven ocean currents.

What circulation patterns are in the Hadley cell?

Hadley cell model of the Earth’s atmospheric circulation that was proposed by George Hadley (1735). It consists of a single wind system in each hemisphere with westward and equatorward flow near the surface and eastward and poleward flow at higher altitudes.

What causes Hadley circulation?

The Hadley circulation or Hadley cell—a worldwide tropical atmospheric circulation pattern that occurs due to uneven solar heating at different latitudes surrounding the equator—causes air around the equator to rise to about 10-15 kilometers flow poleward (toward the North Pole above the equator the South Pole below …

What does the tropopause do?

The tropopause minimum acts as a barrier^ between the troposphere and stratosphere because mixing and heat transport by convection can only occur when temperature decreases with height. The troposphere – with convection allowed – is turbulent and well mixed.

How is Ferrel cell formed?

The Ferrel cell occurs at higher latitudes (between 30 degrees and 60 degrees N and 30 degrees and 60 degrees S): Air on the surface is pulled towards the poles forming the warm south-westerly winds in the northern hemisphere and north-westerly winds in the southern hemisphere.

Who discovered the Hadley cell?

In 1735 a London lawyer and amateur meteorologist named George Hadley came up with an even brighter idea that ultimately helps explain not just ocean winds but also why our planet has rain forests in a belt at the equator and deserts just north and south of that.

What is the main difference between Hadley cell and Walker cell?

The Hadley cell causes air to rise near the equator and the Walker cell results in air rising over the western Pacific Ocean. So in general rainfall amounts increase near the equator and as you travel westward across the Pacific.

What are two main controls on surface ocean circulation?

Ocean circulation derives its energy at the sea surface from two sources that define two circulation types: (1) wind-driven circulation forced by wind stress on the sea surface inducing a momentum exchange and (2) thermohaline circulation driven by the variations in water density imposed at the sea surface by …

How does the thermohaline circulation work?

Thermohaline circulation begins in the Earth’s polar regions. When ocean water in these areas gets very cold sea ice forms. The surrounding seawater gets saltier increases in density and sinks. Winds drive ocean currents in the upper 100 meters of the ocean’s surface.

What does the thermohaline circulation do?

Thermohaline circulation plays an important role in supplying heat to the polar regions. Therefore it influences the rate of sea ice formation near the poles which in turn affects other aspects of the climate system (such as the albedo and thus solar heating at high latitudes).

How ocean surface and circulation directly affect the pattern of climate around the world?

Ocean currents act much like a conveyor belt transporting warm water and precipitation from the equator toward the poles and cold water from the poles back to the tropics. Thus ocean currents regulate global climate helping to counteract the uneven distribution of solar radiation reaching Earth’s surface.

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How are the patterns of ocean currents different from the prevailing wind patterns?

As the winds sweep across the ocean surface they drive the ocean surface currents. Over periods of months to years they set up a global circulation of surface currents which reflects the patterns of the prevailing winds. Look at the map of global currents compare it to the average winds on the right.

How does the atmospheric circulation affect ocean currents and gyres?

They sit beneath an area of low atmospheric pressure. Wind drives the currents in subpolar gyres away from coastal areas. These surface currents are replaced by cold nutrient-rich water in a process called upwelling. … The Coriolis effect is not present at the Equator and winds are the primary creators of currents.

What is the main factor that determines the global wind pattern?

What is the main factor that determines the global wind pattern? uneven heating of Earth’s surface by the Sun. Rainforests are found near the equator because of the convergence of the trade winds which causes increased rainfall.

What do you notice about the global wind and surface current patterns?

What do you notice about the global wind and surface current patterns? In general the direction of the wind flows in the same direction as the ocean surface currents. The global winds in the first map generally travel in either a clockwise or counterclockwise direction.

Ocean Circulation: Patterns & Effect on Climate


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