# Atmosphere Modeling: If G Doubles, How Tall?

• abelthayil
In summary, if the acceleration due to gravity was doubled on Earth, the atmosphere would be half as thick assuming no change in total mass or temperature. However, most atmospheric scientists do not consider the height of the atmosphere as it is believed to gradually blend into outer space without a fixed interface. The concept of "scale height" may be useful in understanding the top of the tropopause, but the question of the atmosphere's height has no practical value.
abelthayil
If g (acceleration due to gravity) was double on Earth, how tall would our atmosphere be?

Assuming no change in the total atmospheric mass or temperature, the Atmosphere would be half as thick.

Actually, most atmospheric scientists give no thought to how high the atmosphere might be. The assumption is that it grades imperceptibly into outer space, with no fixed interface. It does not appear to be a question whose answer would have any practical value.

Or, we might treat it like the old riddle, "How long is a piece of string?"

The correct answer is, "Twice the distance from the middle to one end!"

klimatos said:
Actually, most atmospheric scientists give no thought to how high the atmosphere might be. The assumption is that it grades imperceptibly into outer space, with no fixed interface. It does not appear to be a question whose answer would have any practical value.
The "scale height" is useful, though, along with other concepts related to the OP's question such as the top of the tropopause.

If the acceleration due to gravity on Earth were to double, it would have a significant impact on the height of our atmosphere. This is because the height of the atmosphere is determined by the balance between the downward force of gravity and the upward force of air pressure. With a higher g value, the downward force of gravity would increase, pulling the atmosphere closer to the surface of the Earth.

Currently, the height of the atmosphere is approximately 100 km (62 miles) above the Earth's surface. If g were to double, the atmosphere would likely collapse to a much lower altitude, possibly as low as 50 km (31 miles). This is because the increased gravitational force would compress the air molecules closer to the surface, resulting in a denser atmosphere.

This change in atmospheric height would have significant consequences for life on Earth. The lower altitude of the atmosphere would lead to higher air pressure, making it difficult for organisms adapted to the current pressure to survive. Additionally, the increased density of the atmosphere would trap more heat, leading to higher temperatures at the surface of the Earth.

In conclusion, if g were to double, the atmosphere on Earth would likely be compressed to a lower altitude, resulting in higher air pressure and temperatures. This would have a significant impact on the environment and the survival of living organisms.

## 1. What is atmosphere modeling?

Atmosphere modeling is a process of using mathematical equations, physical laws, and computer simulations to represent and predict the behavior of Earth's atmosphere. It helps us understand the complex interactions between different components of the atmosphere, such as temperature, pressure, and gas concentrations.

## 2. How is atmosphere modeling used?

Atmosphere modeling is used in various fields, such as meteorology, climatology, and air quality research. It helps us understand how changes in the atmosphere, such as changes in gas concentrations or temperature, can impact weather patterns, climate change, and air pollution levels.

## 3. What does it mean if G doubles in atmosphere modeling?

G in atmosphere modeling refers to the acceleration due to gravity, which is a constant value on Earth. If G were to double, it would mean that the gravitational force acting on objects would also double. This could have significant impacts on atmospheric dynamics and the behavior of weather systems.

## 4. How does changing G affect atmospheric height?

If G were to double, the atmospheric height would also change. This is because the relationship between pressure, density, and height is dependent on gravity. A doubling of G would result in a decrease in atmospheric height, meaning the atmosphere would be more compressed and closer to the Earth's surface.

## 5. Can atmosphere modeling predict changes in G?

No, atmosphere modeling cannot predict changes in G. The value of G is constant on Earth and is not expected to change significantly in the near future. However, atmosphere modeling can help us understand the impacts of changes in other factors, such as greenhouse gas concentrations, on the Earth's atmosphere and climate.

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