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The ‘Doldrums’ are located in which pressure belt?
In the Doldrums, the intense solar heating at the equator causes air to expand and rise rapidly. This upward movement creates a belt of low pressure characterized by high humidity, frequent afternoon thunderstorms and "sultry" weather. For early sailors, the lack of horizontal wind meant ships couldRead more
In the Doldrums, the intense solar heating at the equator causes air to expand and rise rapidly. This upward movement creates a belt of low pressure characterized by high humidity, frequent afternoon thunderstorms and “sultry” weather. For early sailors, the lack of horizontal wind meant ships could be stranded for weeks. While the air is calm at the surface, the upper atmosphere is highly active as the rising air begins its journey toward the poles as part of the Hadley Cell. The ITCZ also shifts slightly north or south depending on the season.
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See lessWhat is ‘Adiabatic’ heating? (A) Heating through solar radiation (B) Heating through the addition of fuel (C) Heating of air due to compression as it sinks (D) Heating through contact with the warm ground
The term "adiabatic" refers to a process where no heat is exchanged with the surrounding environment. When air sinks (subsides), the weight of the atmosphere above it increases, squeezing the air molecules together. This compression forces the molecules to move faster, which we detect as a rise in tRead more
The term “adiabatic” refers to a process where no heat is exchanged with the surrounding environment. When air sinks (subsides), the weight of the atmosphere above it increases, squeezing the air molecules together. This compression forces the molecules to move faster, which we detect as a rise in temperature. This is the opposite of adiabatic cooling, which happens when air rises and expands. Adiabatic heating is the reason why air descending the leeward side of a mountain range (like the Chinook or Foehn winds) becomes very warm and dry.
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See lessWhich of the following is an example of a ‘Primary Pollutant’ in the atmosphere? (A) Ozone (B) Sulfuric acid (C) Sulfur dioxide (D) PAN (Peroxyacetyl nitrate)
Primary pollutants are the direct result of combustion or industrial processes. Sulfur dioxide (SO2) is released when coal or oil containing sulfur is burned. Once in the atmosphere, SO2 can react with water vapor and oxygen to form sulfuric acid, which is a secondary pollutant and a major componentRead more
Primary pollutants are the direct result of combustion or industrial processes. Sulfur dioxide (SO2) is released when coal or oil containing sulfur is burned. Once in the atmosphere, SO2 can react with water vapor and oxygen to form sulfuric acid, which is a secondary pollutant and a major component of acid rain. Understanding the distinction is vital for environmental regulation, as controlling primary pollutants is the only way to prevent the formation of more toxic secondary substances. Other common primary pollutants include carbon monoxide and nitrogen oxides emitted from vehicle exhausts.
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See lessWhat is the ‘Chinook’ wind also known as? (A) Snow eater (B) Rain maker (C) Dust devil (D) Thunder bringer
Chinooks occur when moist air from the Pacific is forced over the mountains. As the air rises, it loses its moisture as rain or snow on the western side. When this now-dry air spills over the crest and descends the eastern side, it is compressed by the higher pressure at lower elevations. This comprRead more
Chinooks occur when moist air from the Pacific is forced over the mountains. As the air rises, it loses its moisture as rain or snow on the western side. When this now-dry air spills over the crest and descends the eastern side, it is compressed by the higher pressure at lower elevations. This compression heats the air rapidly. Because the air is extremely dry and warm, it can sublimate snow directly into water vapor. Similar winds in the Alps are known as “Foehn” winds, demonstrating a universal atmospheric principle of mountain meteorology.
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See lessWhich instrument is used to measure the intensity of solar radiation?
Pyranometers typically use a thermopile sensor under a glass dome. The sensor absorbs solar radiation, which generates a small electrical voltage proportional to the intensity of the light. This measurement includes both direct sunlight and "diffuse" sunlight reflected by clouds or the atmosphere. DRead more
Pyranometers typically use a thermopile sensor under a glass dome. The sensor absorbs solar radiation, which generates a small electrical voltage proportional to the intensity of the light. This measurement includes both direct sunlight and “diffuse” sunlight reflected by clouds or the atmosphere. Data from pyranometers is essential for calculating the Earth’s energy budget and for determining the efficiency of solar power plants. By monitoring variations in solar intensity, researchers can also track changes in atmospheric transparency caused by aerosols, pollution or volcanic ash.
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