Table of Contents
- 1 When air moves over cold land what happens to the air above?
- 2 What happens when a warm air mass moves over a cold air mass?
- 3 What are two things that can force air to rise quickly?
- 4 What are the 4 types of air masses?
- 5 What causes a tornado a front form between a cold air mass and a warm air mass?
- 6 What happens when air masses move suddenly?
- 7 How does the buoyancy of an air parcel depend on the environment?
- 8 How are air parcels related to atmospheric stability?
When air moves over cold land what happens to the air above?
The cold air mass is dense so it slides beneath the warm air mass and pushes it up. Imagine that you are standing in one spot as a cold front approaches. Along the cold front, the denser, cold air pushes up the warm air, causing the air pressure to decrease (Figure above).
What weather condition may result from the movement of a cold air mass over a warmer sea surface?
Cold mP air that moves over a warm surface is unstable and can bring rain showers. When the mP air moves over a surface that is only slightly warmer, the atmosphere is less unstable and may produce stratus clouds and drizzle.
What happens when a warm air mass moves over a cold air mass?
They push against each other along a line called a front. When a warm air mass meets a cold air mass, the warm air rises since it is lighter. On the other hand, when a cold air mass catches up with a warm air mass, the cold air slides under the warm air and pushes it upward. As it rises, the warm air cools rapidly.
What causes cold air masses?
When a warmer air mass travels over colder ground, the bottom layer of air cools and, because of its high density, is trapped near the ground. In general, cold air masses tend to flow toward the equator and warm air masses tend to flow toward the poles. This brings heat to cold areas and cools down areas that are warm.
What are two things that can force air to rise quickly?
Surface heating and free convection. During the daytime, the earth’s surface is heated by the sun, which in turn heats the air in contact with the surface.
What causes air to rise high into the atmosphere?
The most powerful force which causes air to rise and cool is the Sun. When the Sun heats the surface of the Earth, warming of the air above the ground takes place. This warm air rises and cools as it goes higher. At a certain point, condensation will occur and clouds will form.
What are the 4 types of air masses?
There are four categories for air masses: arctic, tropical, polar and equatorial. Arctic air masses form in the Arctic region and are very cold. Tropical air masses form in low-latitude areas and are moderately warm. Polar air masses take shape in high-latitude regions and are cold.
What are the 5 types of air masses?
Five air masses affect the United States during the course of a typical year: continental polar, continental arctic, continental tropical, maritime polar, and maritime tropical.
What causes a tornado a front form between a cold air mass and a warm air mass?
A cold front forms when a cold air mass pushes into a warmer air mass. Cold fronts can produce dramatic changes in the weather. They move fast, up to twice as fast as a warm front.
What usually happens when two air masses meet select all that apply?
When two air masses meet together, the boundary between the two is called a weather front. At a front, the two air masses have different densities, based on temperature, and do not easily mix. One air mass is lifted above the other, creating a low pressure zone.
What happens when air masses move suddenly?
Cold fronts often bring sudden changes in the weather. When a warm air mass runs into a cold air mass it creates a warm front. The warm air mass is moving faster than the cold air mass, so it flows up over the cold air mass. As the warm air rises, it cools, resulting in clouds and sometimes light precipitation.
What are 4 ways air can be forced upward?
– There are four lifting mechanisms that form clouds: Orographic Lifting, Convection, Convergence, and Updraft. – Orographic lifting is when air cannot go through a mountain, and so it flows over it. – Frontal Lifting is when less dense warm air is forced to rise over cooler, denser air as a weather fronts move.
How does the buoyancy of an air parcel depend on the environment?
This means that the buoyancy (the ability of an air parcel to rise) of an air parcel depends on whether or not it is saturated. In a conditionally unstable atmosphere, an air parcel will resist vertical motion when it is unsaturated, because it will cool faster than the environment at the dry adiabatic lapse rate.
How is the amount of air that flows through a hole limited?
The amount of air that flows through a hole is limited by three factors: The amount of time the pressure is present. Pressure Effects. Air always flows from a high-pressure area to a low-pressure area, much like water running downhill.
When discussing stability in atmospheric sciences, we typically think about air parcels, or imaginary blobs of air that can expand and contract freely, but do not mix with the air around them or break apart. The key piece of information is that movement of air parcels in the atmosphere can be estimated as an adiabatic process.
How is the flow of air in a building determined?
In either case, the actual flow of air is determined by several factors, including hole size, resistance to flow, and pressure effects. Controlled air flow is generated by a mechanical device and is designed to help ventilate a building and/or distribute conditioned air throughout a building.