Since the atmosphere is heated from above by direct solar radiation, it heats the Earth’s surface unevenly. The tropics are hot, but are hotter further south due to proximity to the equator. The extra heat makes the air rise there. The hot air moves away from the equatorial regions, generally northward or southward toward the […]
Wind is a meteorological phenomenon in which there is a flow of air in the atmosphere, called wind. It happens when the sun heats the ground or ocean or water to a temperature higher than that of adjacent regions. This difference in temperature generates thermal currents, i.e., an uneven heating of the ground and water
Forces Affecting the Velocity and Direction of Wind Read More »
Sea level pressure is a measurement that is done in millibars or hectopascals. It is also known as atmospheric pressure. It is the average pressure of the air over a given area. Along 30° N and 30° S are found the high-pressure areas known as the subtropical highs. Further pole wards along 60° N and
Atmospheric pressure is the force exerted on a surface by the weight of air above that surface. The total atmospheric pressure at sea level is the average of the air pressure at the Earth’s surface and the air pressure at sea level. The atmospheric pressure is expressed in units of milibar. At sea level the
Air movements are created by the uneven heating of the Earth’s surface. The Sun heats equatorial regions more than polar ones, so air near the ground’s surface expands and the pressure lowers. This causes air to move away from the tropics towards higher latitudes, which results in warm air pushing cold air away. Atmospheric pressure
Inversion of temperature is a meteorological condition in which a layer of warm air is situated above a layer of cooler air at the same height. This situation affects stability in the atmosphere and restricts the vertical mixing of atmospheric constituents. Inversions occur when warm air is underlain by cool air at the same level,
Temperature is a measure of how hot (or cold) a thing is. We measure temperatures with thermometers to give us the numerical value that we know as temperature. The major units of measuring temperature are Celsius and Fahrenheit. Factors Controlling Temperature Distribution The variations of climate are controlled by the size, shape and altitude of
All the rest of the energy is absorbed in the atmosphere and in the earth. Since the efficiencies in the upward and downward fluxes differ in different places, it follows that some locations will be cooler than others. The overall picture is one of a planet that is continuously being cooled from radiation from outer
The earth receives energy in the form of solar radiation. The incoming solar energy passes through the atmosphere, enters the surface (land or ocean), and eventually appears as land or ocean heating. At the same time, the earth emits longwave (infrared) radiation to space, mainly due to thermal properties of the atmosphere. This process is
The insolation received by the earth is in short waveforms and heats up its surface. The earth, after being heated itself becomes a radiating body and radiates energy to the atmosphere in the long waveform. This energy heats up the atmosphere from below. This process is known as terrestrial radiation. The longwave radiation is absorbed
