What is the boundary called where the cooling rate of the atmosphere changes at the top of the Mesosphere?
The mesopause is the boundary layer between the mesosphere and the thermosphere. It is notable for being the coldest place in Earth’s atmosphere, with temperatures dipping as low as -100°C. This transition zone marks the point where the temperature stops decreasing with height and begins to rise again due to the absorption of high-energy solar radiation. ANSWER: (C) Mesopause
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The mesopause is the boundary at the top of the mesosphere where temperature stops decreasing and starts increasing in the next layer. It is the coldest part of Earth’s atmosphere. This boundary separates the mesosphere from the thermosphere, marking a significant change in temperature trend.
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Located approximately 85 kilometers above the Earth’s surface, the mesopause represents a thermal minimum in our atmosphere. In the mesosphere below, temperatures drop as altitude increases because of the lack of solar-absorbing gases. At the mesopause, this trend reaches its limit. Above this boundary, in the thermosphere, temperatures begin to climb dramatically because molecules are directly exposed to intense X-ray and UV radiation from the sun. Despite the high temperatures in the thermosphere, the air is so thin that it would feel freezing to a human, making the mesopause the definitive “cold trap” of the planet.