What is the Troposphere? The troposphere is the lowest portion of Earth’s atmosphere and is also where nearly all weather takes place. It contains approximately 75% of the atmosphere’s mass and 99% of the total mass of water vapor and aerosols. The average depths of the troposphere are 20 km (12 mi) in the tropics, 17 km (11 mi) in the mid-latitudes, and 7 km (4.3 mi) in the polar regions in winter. The lowest part of the troposphere, where friction with the Earth’s surface influences airflow, is the planetary boundary layer. This layer is typically a few hundred meters to 2 km (1.2 mi) deep depending on the landform and time of day.
Here are read and learn; What is the Troposphere? Meaning and Definition.
Atop the troposphere is the tropopause, which is the border between the troposphere and stratosphere. The tropopause is an inversion layer, where the air temperature ceases to decrease with height and remains constant through its thickness.
The word troposphere derives from the Greek: Tropos for “turn, turn toward, trope” and “-sphere” (as in, the Earth), reflecting the fact that rotational turbulent mixing plays an important role in the troposphere’s structure and behavior. Most of the phenomena associated with day-to-day weather occur in the troposphere.
The troposphere is the lowest major atmospheric layer, extending from the Earth’s surface up to the bottom of the stratosphere. The troposphere is where all of Earth’s weather occurs. It contains approximately 80% of the total mass of the atmosphere.
The troposphere is characterized by decreasing temperature with height (at an average rate of 3.5 degrees F per thousand feet, or 6.5 degrees C per kilometer). In contrast, the stratosphere has either constant or slowly increasing temperature with height.
The boundary between the troposphere and the stratosphere is called the “tropopause”, located at an altitude of around 5 miles in the winter, to around 8 miles high in the summer, and as high as 11 or 12 miles in the deep tropics.
When you see the top of a thunderstorm flatten out into an anvil cloud, it is usually because the updrafts in the storm have reached the tropopause, where the environmental air is warmer than the cloudy air in the storm, and so the cloudy air stops rising.
Definition of The Troposphere:
The lowest densest part of the earth’s atmosphere in which most weather changes occur and temperature generally decreases rapidly with altitude and which extends from the earth’s surface to the bottom of the stratosphere at about 7 miles (11 kilometers) high.
Overview of The Troposphere:
The troposphere is the lowest layer of Earth’s atmosphere. Most of the mass (about 75-80%) of the atmosphere is in the troposphere. Most types of clouds are found in the troposphere, and almost all weather occurs within this layer.
The bottom of the troposphere is at Earth’s surface. The troposphere extends upward to about 10 km (6.2 miles or about 33,000 feet) above sea level. The height of the top of the troposphere varies with latitude (it is lowest over the poles and highest at the equator) and by season (it is lower in winter and higher in summer). It can be as high as 20 km (12 miles or 65,000 feet) near the equator, and as low as 7 km (4 miles or 23,000 feet) over the poles in winter.
Air is warmest at the bottom of the troposphere near the ground level. Air gets colder as one rises through the troposphere. That’s why the peaks of tall mountains can be snow-covered even in the summertime.
Air pressure and the density of the air also decrease with altitude. That’s why the cabins of high-flying jet aircraft pressurize.
The layer immediately above the troposphere calls the stratosphere. The boundary between the troposphere and the stratosphere calls the “tropopause”.