Hello dear friends, solsarin in this article is talking about “wind blows in the northern hemisphere”.
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Wind The energy that drives wind originates with the sun, which heats the Earth unevenly, creating warm spots and cool spots. Two simple examples of this are sea breezes and land breezes.
occur when inland areas heat up on sunny afternoons. That warms the air, causing it to rise. Cooler air rushes in from the ocean to take its place and presto, a wind is born. By late afternoon, a strong breeze can be blowing dozens of miles inland. A similar effect can occur near big lakes, where the wind is referred to as a lake breeze.
Similar forces produce global wind patterns that affect climate. The tropics, for example, are always hot. Air rises here and spreads north and south, high above the land. Lower down, air is pulled in from the north and south. The coriolis effect, an offshoot of the Earth‘s rotation, makes moving air masses curve, so that the winds converging on the Equator come from the northeast in the Northern Hemisphere and the southeast in the Southern Hemisphere. These winds are called the trade winds.
Farther from the Equator, the surface winds try to blow toward the Poles, but the coriolis effect bends them the opposite direction, creating westerlies. This is why so many weather events in the United States come from the west.
At latitudes higher than about 60°, cold surface winds try to blow toward the Equator, but, like the trade winds, they are bent by the coriolis effect, producing polar easterlies.
Highs and Lows
Within the mid-latitudes, weather effects create high- and low-pressure zones, called highs and lows, respectively. Air moves from areas of high pressure to low pressure. As it moves, however, it spirals due to the coriolis effect, producing the shifting winds we experience from day to day, as highs and lows drift under the influence of the prevailing westerlies.
Which wind blows north east in the northern hemisphere?
B. Trade winds
C. Polar winds
D. Seasonal winds
Hint: In the Northern Hemisphere, air is blown in an anticlockwise direction around low pressure, and in a clockwise direction around high pressure. Wind blows just above the equator, winds blow from east to west. With them the winds draw surface water, producing currents that drift westwards due to the Coriolis effect.
In the northern hemisphere, as the winds blow towards the equator, the rotation of the planet shifts to the west. These winds are called trade winds. Such winds blow at a latitude of 0 degrees to 30 degrees, which is very close to the equator. That’s because of the Coriolis effect.
Now lets see all the options :
Westerlies : The western, anti-trade or prevailing western winds prevail from the west to the east in the middle latitudes between 30 and 60 degrees latitude. They emerge from the high-pressure areas in the latitudes of the horse and the inclination towards the poles, and they execute extratropical cyclones in this general manner. Thus this is the wrong option(A).
Trade winds : Trade winds or easterlies are constant east-to-west prevailing winds that flow in the equatorial region of the Earth (between 30°N and S). Trade winds blow primarily from the north-east of the Northern Hemisphere and from the south-east of the Southern Hemisphere, strengthening during the winter and when the Arctic oscillation is in its warm phase. Thus this is the right option(B).
Polar winds : A polar wind or plasma fountain is a permanent plasma outflow from the polar regions of the magnetosphere of the Planet, induced by the interaction between the solar wind and the atmosphere of the Earth. Thus this is the wrong option(C).
Season winds : With the start of various seasons, the winds shift their course. These are called Seasonal Winds. In low-latitude climates, a monsoon is a form of seasonal wind which changes direction between winter and summer seasonally. Thus this is the wrong option(D).
Hence the correct answer is option B.
– The Northern Hemisphere has more land than the Southern Hemisphere. Believe it or not, the Northern Hemisphere is about 68 percent of all the land on Earth!
– The pressure and temperature variations between the two sides of the Pacific are caused by trade winds.
– The trade winds were named after the crews of sailing ships that relied on the winds during the western ocean crossings.
The Way the Wind Blows
The rotation of the Earth forces winds into clockwise and counterclockwise motions, depending on air pressure.
- In the northern hemisphere this wind spiral flows in an anticlockwise direction around areas of low pressure and in a clockwise direction around areas of high pressure – the opposite is the case in the southern hemisphere as the Coriolis force acts in the opposite direction.
What is the Coriolis effect?
The Earth’s rotation means that we experience an apparent force known as the Coriolis force. This deflects the direction of the wind to the right in the northern hemisphere and to the left in the southern hemisphere. This is why the wind-flow around low and high-pressure systems circulates in opposing directions in each hemisphere.
The Coriolis effect was described by the 19th-century French physicist and mathematician Gustave-Gaspard de Coriolis in 1835. He formulated theories of fluid dynamics through studying waterwheels, and realized the same theories could be applied to the motion of fluids on the surface of the Earth.
The Coriolis effect in action
One of the most common examples of the Coriolis effect in action is seen through the deflection of winds on Earth.
Another example of the Coriolis effect can be demonstrated by looking at a typical playground roundabout. If you are standing in the centre of a spinning roundabout (spinning anticlockwise) and attempt to throw a ball, it will appear to curve to the right, when in fact it is travelling in a straight line to anyone watching who is not on the roundabout. This is similar to what happens in the northern hemisphere of the Earth, where winds are deflected to the right.
This deflection is a major factor in explaining why winds blow anticlockwise around low pressure and clockwise around high pressure in the northern hemisphere and visa versa in the southern hemisphere. Without the Coriolis effect air would simply flow directly from areas of high pressure to areas of low pressure.
The Coriolis effect influences the global wind patterns and gives the UK is prevailing south-westerlies. Here, winds blowing from the subtropical highs towards the low pressure in the north get deflected to the right.
When air moves, the Coriolis force deflects air either to the right of air motion in the Northern Hemisphere and to the left of air motion in the Southern Hemisphere.
Where the Trade Winds from each hemisphere approach each other, the rising air creates instability which, depending on the strength of the winds, results in a line of cumulonimbus clouds. This line of weather is known as the Inter Tropical Convergence Zone (ITCZ). The Inter Tropical Convergence Zone (ITCZ) is generally located near the Equator year-round, except in the Indian Ocean and central Asian landmass in the Northern Hemisphere Summer.
Considering the air which moves from the subtropical high pressure systems at around 30 degrees latitude towards the ITCZ which is located near the Equator, and considering the effect of the Coriolis Force::
- In the northern hemisphere the Trade Winds generally blow from the north east while in the southern hemisphere they blow from the south east. The direction of the winds is influenced by land masses so the Trade Winds tend to be more uniform over the oceans.