Outlook on Composition of Atmosphere

The Earth’s atmosphere not only contains the oxygen we breathe, but it also shields us from harmful radiation from the sun, the moon, and other celestial bodies. In a nutshell, the atmosphere serves as a kind of protective bubble around us.

Moisture, another type of water, abounds in the atmosphere. We can see it when it rains. Invisible vapour or visible clouds are present in the air for the most of the time, and are continually circulated between both the Surface and the atmosphere by way of the water cycle. When it comes to global weather, humidity in the air is an important factor.

Various sorts of gases make up the atmosphere.

The major levels in earth’s atmosphere are nitrogen and oxygen, which together account for 99 percent of the atmosphere’s mass. The rest of the atmosphere consists of gases such as argon, carbon dioxide, neon, helium, and hydrogen. At altitudes over 120 kilometres, the composition of both the gasses changes so drastically that oxygen becomes nearly undetectable. Carbon dioxide (as well as water vapour) can only be detected at a distance of 90 kilometres from the Earth’s surface. Carbon dioxide is a very significant gas in the context of meteorology. Radiation from the sun (insolation) may pass through, but terrestrial radiation (outsolation) cannot. Radiation from the Earth’s surface is absorbed by the atmosphere and returned to the Earth’s surface. The greenhouse effect may mostly be attributed to the presence of carbon dioxide in the atmosphere.  Because fossil fuels have been used, the amount of carbon dioxide has increased over the last several decades, while other gases have remained steady. Global warming is a direct result of the increasing concentration of carbon dioxide in the atmosphere. CO2: Another principal feature of an air may be found approximately 10 and 50 kilometres above the earth’s surface, and it is known as ozone gas. It serves as a screen, absorbing the sun’s ultraviolet radiation before they reach the earth’s surface. The stratosphere’s ozone layer is the only place where ozone gas can be found in the atmosphere. Water Vapour Gases Water vapour refers to the gaseous form of water in the atmosphere. That is the origin of precipitation of all types. The lower the height, the less water vapour there is. In addition, it decreases from the latitudes (or the equator) to the poles. As much as 4% may be found in the atmosphere in the warm and moist areas, where it is found.

Evaporation and transpiration are the primary means through which water vapour enters the atmosphere. There is evaporation and transpiration in the water of oceans, seas, river ponds, lakes, and wetlands.

Solar energy (irradiance) out from sun is absorbed by water vapour, which retains some of the Earth’s radiated heat. As a result, it works as a blanket, keeping the ground from being too hot or too cold.

Another factor that affects air stability and instability is water vapour.

Particles of dust

• The lowest levels of the atmosphere are the most common location for dust particles.
• Dust, fumes, sea salt, ashes, spores, etc. are examples of these particles.
• Dry winds in tropical and temperate areas cause higher concentrations of dust particles than in tropic and arctic regions.
• To condense water vapor, these dust particles are necessary. Clouds are generated when water vapor condenses over dust particles, resulting in the formation of droplets of water.

Layers of Atmosphere

Troposphere

• As the atmosphere’s lowest layer, it is referred to as tropospheric.
• On the equator, this layer is roughly 18 kilometres high, whereas, on the poles, it is around 8 kilometres high.
• Strong convectional currents carry heat to considerable altitudes, which is why the troposphere’s thickness is greatest around the equator.
• Water vapour and dust particles are found in the troposphere.
• That’s the most significant part of earth’s atmosphere since it is the only layer where weather changes may occur.

Stratosphere

• Only a little layer of air separates us from entering the stratosphere.
• At its highest point, it rises to a height of 50 kilometres.
• Lower in this layer, up to a height of 20 kilometres, the temperature is almost constant. Afterwards, its temperature goes up gradually as the height increases. As ozone gas builds up in the upper atmosphere, it causes a rise in temperature.
• In this stratum, there are no weather-related occurrences. Here, the wind is blowing horizontally. The best flying conditions are thus found in this stratum of air.
• The stratopause is the highest point in the stratosphere.

Mesosphere

• Over the stratosphere, it is also the third layer of the atmosphere.
• It grows to a height of 80 kilometres.
• With rising altitude, the temperature drops to –100 degrees Celsius at an altitude of 80 kilometres.
• This stratum is home to meteors or falling stars.
• The mesopause is the highest point of the mesosphere.

Thermosphere

• These layers are found 80 to 400 kilometres above the mesopause.
• The ionosphere is made up of electrical charges called as ion.
• This layer reflects back to the ground radio waves that have been emitted from the earth, making radio broadcasting feasible.
• The higher you go, the hotter it becomes.

Exosphere

• Topmost in the air, this layer is known as the exosphere.
• Owing to the unavailability of gravitational attraction, gas concentrations are very low in this sphere. Because of this, the air density here is very low.

Conclusion

The troposphere, the bottom environment, is where most of the Earth’s air can be found, forced downward by gravity. The troposphere, which is barely 10 kilometers deep, is where all the world’s largest weather happens. The transfer of heat is what causes the weather. Moving air or wind, caused by temperature and pressure variations, exchanges heat between hot and cool regions. Different layers make up the atmosphere, which stretches far into the cosmos. For example, the ozone, that’s above the troposphere and shields Earth from the Sun’s damaging UV radiation, is found in the stratosphere. Those even farther high in the sky may observe meteors as shooting stars in the darkness of the night.