Global Wind Patterns - AP Environmental Science
- What is the primary effect of the polar front on weather?
- It creates stormy conditions where cold and warm air meet. Boundary zone where contrasting air masses create unstable weather conditions.
- What type of global wind pattern is found at high latitudes?
- Polar easterlies. Cold winds from polar regions flowing eastward toward lower latitudes.
- State the primary cause of global wind patterns.
- Uneven heating of Earth's surface by the sun. Solar radiation creates temperature differences that drive air circulation patterns.
- Which global wind pattern is found near the equator?
- The trade winds. Easterly winds between 0° and 30° latitude on both sides of the equator.
- Which global wind pattern affects the weather in North America most?
- The prevailing westerlies. Mid-latitude winds that carry weather systems across the continent from west to east.
- What is the primary role of the subtropical jet stream?
- To separate tropical and subtropical air masses. High-altitude wind current marking the boundary between tropical and temperate zones.
- How do global wind patterns influence global precipitation patterns?
- They determine regions of high and low rainfall. Rising and sinking air patterns control where deserts and rainforests form.
- What is the main function of the Ferrel Cell?
- To circulate air between 30° and 60° latitude. Mid-latitude circulation cell that transfers energy between tropical and polar regions.
- What happens to air at the equator due to solar heating?
- It rises, creating low pressure. Intense solar heating causes thermal expansion and upward air movement.
- What atmospheric layer do global winds primarily occur in?
- The troposphere. Lowest atmospheric layer where weather and wind circulation occur.
- Identify the main characteristic of polar easterlies.
- Cold, dry winds blowing from the east near the poles. High-latitude winds flowing from polar high-pressure areas toward lower latitudes.
- What are the prevailing westerlies?
- Winds that blow from the west to the east in mid-latitudes. Located between 30° and 60° latitude, deflected eastward by Coriolis effect.
- What causes the variability of the polar jet stream?
- Temperature differences between cold polar air and warmer air. Temperature gradients between air masses determine jet stream strength and position.
- Which winds are most affected by the Coriolis effect?
- Winds moving over long distances. Coriolis effect is strongest when winds travel great distances across latitudes.
- What is the primary characteristic of the horse latitudes?
- A region of high pressure and calm winds. Subtropical belt around 30° latitude where descending air creates stable conditions.
- What is the primary direction of the polar jet stream?
- From west to east in the upper atmosphere. High-altitude wind current flowing along the boundary between polar and warmer air.
- Name the cell that circulates air between the equator and 30° latitude.
- The Hadley Cell. Tropical circulation pattern extending from equatorial heating to subtropical highs.
- What is the significance of the polar cell in global wind patterns?
- It circulates cold air from the poles toward lower latitudes. High-latitude circulation that transports cold polar air toward warmer regions.
- What defines the boundaries of the ITCZ?
- The convergence of trade winds from both hemispheres. Meeting point of northeast and southeast trade winds creates convergence zone.
- What causes the seasonal shift of the ITCZ?
- The tilt of Earth's axis and its orbit around the sun. Seasonal solar angle changes move the zone of maximum heating north and south.
- How does the Coriolis effect influence the direction of cyclones?
- Cyclones rotate counterclockwise in the Northern Hemisphere. Coriolis deflection creates rotational motion in low-pressure storm systems.
- What is the Coriolis effect?
- The deflection of moving air due to Earth's rotation. Caused by Earth's rotation deflecting moving objects to the right in the Northern Hemisphere.
- Which global wind pattern is responsible for the Sahara Desert's dry conditions?
- The descending limb of the Hadley Cell. High-pressure zone at 30°N creates dry, sinking air over desert regions.
- What is the main effect of the Coriolis effect on global winds?
- It causes winds to curve rather than move straight. Earth's rotation deflects moving air masses, creating curved wind patterns.
- Which direction do the trade winds blow in the Southern Hemisphere?
- From the southeast to the northwest. Coriolis effect deflects easterly winds toward the left in the Southern Hemisphere.
- What is the primary cause of monsoon winds?
- Differential heating of land and sea. Seasonal temperature contrasts between continents and oceans drive wind reversals.
- What is the primary cause of the Coriolis effect?
- Earth's rotation. Spinning planet deflects moving objects, including air masses and winds.
- What is the relationship between global winds and the jet stream?
- The jet stream is a band of strong winds in the upper atmosphere. High-altitude rivers of fast-moving air that steer surface weather systems.
- What is the primary role of global wind patterns in Earth's climate?
- Distributing heat and moisture around the planet. Transport thermal energy from warm equatorial regions to cooler polar areas.
- Which direction do the trade winds blow in the Northern Hemisphere?
- From the northeast to the southwest. Coriolis effect deflects easterly winds toward the right in the Northern Hemisphere.
- What is the main characteristic of the doldrums?
- A region of calm winds near the equator. Also called ITCZ, where converging trade winds create light variable winds.
- Why do global wind patterns shift seasonally?
- Due to Earth's axial tilt and orbit. Earth's orbital position changes solar heating patterns throughout the year.
- What is the approximate latitude range of the trade winds?
- Between 0° and 30° latitude. Tropical belt where Hadley Cell circulation creates consistent easterly winds.
- What is the impact of global wind patterns on ocean currents?
- They help drive surface ocean currents. Wind friction drags surface water, creating circulation patterns in ocean basins.
- What occurs at the ITCZ?
- Rising air and frequent thunderstorms. Convergence zone where warm, moist air rises and creates tropical weather.
- What is the direction of the movement of air in the Ferrel Cell?
- Air moves poleward and eastward. Mid-latitude circulation driven by interaction between Hadley and Polar cells.
- What is the Intertropical Convergence Zone (ITCZ)?
- A region where the trade winds converge near the equator. Low-pressure zone where rising air creates clouds and precipitation.
- What is the primary mechanism causing the Hadley Cell circulation?
- Convection from solar heating at the equator. Tropical circulation cell driven by equatorial heating and Coriolis deflection.
- Identify the latitude range of the prevailing westerlies.
- Between 30° and 60° latitude. Mid-latitude zone where Ferrel Cell circulation creates westerly wind flow.