Final answer:
The subtropical jet stream is an atmospheric feature that influences weather patterns by transporting warm and cold air across the globe. It is primarily found at the upper levels of the troposphere, near the tropopause, at altitudes ranging from 12 to 15 km, varying with latitude.
Step-by-step explanation:
What Does a Subtropical Jet Stream Do?
The subtropical jet stream is a fast-flowing, narrow air current found in the atmosphere of the Earth. Its primary function is to play a significant role in the formation of weather patterns and regulating temperature by moving warm air from the tropics towards the poles and cold air from the poles towards the equator. This action helps to balance the heat distribution around the Earth.
At What Upper Air Level Is the Subtropical Jet Stream Found Best?
The subtropical jet stream is typically located in the upper levels of the troposphere, close to the region known as the tropopause, which varies from about 12-15 km above the Earth's surface, with a greater altitude in the tropics and a lower altitude at the poles. This region is right above the troposphere, where most of the Earth's weather and wind patterns, such as those observed on Jupiter and Saturn, are confined. Characteristically, the subtropical jet stream is situated above the top of the troposphere and can extend into the lower stratosphere.