This is a timed quiz. You will be given 3000 seconds to answer all questions. Are you ready?
In relation to sea breezes, which statement is correct?
By day land will heat up more than water will, this causes air rise and advect towards the sea. When over the relatively cold sea the warm air cools depends. This air then advects at low level back towards the land. This creates a breeze from the sea on to the shore. By night and early morning land cools down more than water, creating a breeze out to the sea.
Which layer consists the most water vapour?
The warmer the air the greater the potential to carry water vapour, air is warmest in the troposphere close to the earthโs surface. Take care when reading the answers to a question such as this. TropoSPHERE is the layer, TropoPAUSE is the barrier between the current layer and the next one.
Which are the main gasses in the atmosphere and what are the percentages?
Nitrogen and Oxygen are the main gasses in our atmosphere. The percentages remain the same throughout the different layers, however the density will decrease with altitude. This is known as ‘partial pressure’.
An air mass over an ocean is referred to as:
The name of an air mass refers to its origin. A continental air mass has originated over land. A maritime air mass has built up over the sea. Because maritime air originates over water it tends to be considerably more moist than continental air.
When relatively warm dry air moves over a large area of water such as the ocean, its lower layers will absorb water vapour. As a result of this the air will become:
The warmer the air the greater the potential to carry water vapour, water vapour is less dense than air, thus the warm moist air will rise.
The transfer of heat by vertical motion is called:
A moving body of air carries its heat with it and warmer air rises as itโs less dense than surrounding air.
The wind that blows down the mountain slopes at night due to cooling is called:
The earthโs surface cools down at night which in turn due to conduction cools the air close to it. As air cools it becomes more dense and sinks, and flows down the mountain.
10หC in Fahrenheit is:
หF = 9/5 x (หC + 32) , หF = 9/5 x (10 +32) = 50 หF, or use the CRP 1 conversions scale
An area on a synoptic chart appearing as a โV-shapedโ extension of a low pressure area is called:
A trough is an extended region in the shape of a V of relatively low atmospheric pressure, often associated with fronts.
An increasing pressure gradient will result in?
The pressure gradient force is the force between the high and low pressure systems. Air/wind flows from high to low pressure systems and will increase with increase in pressure difference between the high and low pressure system.
A line joining areas of equal pressure is called?
Isobars are lines joining equal sea level pressures, generally curving around high and low pressure systems.
What is your height if you are at 3000 ft altitude, QFE is 1013hPa, and QNH is 1021hPa?
1021 โ 1013 = 8hPa, 30ft per hPa, 8 x 30 = 240ft, 3000ft โ 240ft = 2760ft Remember, 1hPa is equal to 30 feet of altitude.
A cumulonimbus cloud is a hazard to aviation because:
moderate to severe turbulence can be encountered near a CB up to 10 NM away.
A โparcelโ of air with a relative humidity of less than 100% ascends and:
Rising air cools in the troposphere with the DALR if relative humidity is less than 100% or SALR if relative humidity is 100%.
A cold air mass replacing a warm air mass at the surface is called?
Cold front is a cold air mass replacing a warmer air mass, a warm front is a warm air mass replacing a colder air mass, an occluded front is when a cold front has caught up with the warm front.
What cloud type are you most likely to see after the passage of a cold front?
Cold fronts move fairly quickly thus causing frontal uplift and creating cumulus clouds, starting with cirrocumulus, altocumulus, stratocumulus, cumulus.