Equilibrium Climate Sensitivity

In summary: This is a bit of a circular argument - the argument is that because equilibrium climate sensitivity is slow to respond, therefore the equilibrium climate sensitivity is the correct metric to use.Equilibrium Climate Sensitivity - what is the relevance of the word 'equilibrium' - why not 'climate sensitivity?'Hope you can help.The paper argues that the equilibrium climate sensitivity is a better metric to use because it is slow to respond to a forcing.
  • #1
Gondur
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Equilibrium Climate Sensitivity - what is the relevance of the word 'equilibrium' - why not 'climate sensitivity?'
Hope you can help.
 
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  • #2
Here is the precise definition and the math behind the term:
https://www.ipcc.ch/ipccreports/tar/wg1/345.htm

And not climate sensitivity, that is the correct full term according to the paper.

This question is vague and seems like what some folks might term as a throwaway or a lead-in question. What actually are you trying to find or explain?
 
  • #3
Gondur said:
Equilibrium Climate Sensitivity - what is the relevance of the word 'equilibrium' - why not 'climate sensitivity?'
Hope you can help.
The emphasis is the equilibrium or balanced state and the sensitivity of the system to a departure from equilibrium. Much of applied science, e.g., process engineering such as power generation, operation of aircraft or spacecraft , chemical manufacturing, is concerned about control and how the system responds to deviations or perturbations from steady-state. In health care, doctors would be concerned if one's temperature deviated more than a few degrees F, e.g., having a temperature of 104°F as compared to 97.4 to 99°F, means one has a fever. If the temperature drops much lower (body temperature falls below 95 F (35 C)), one is experiencing hypothermia.

When one's body temperature drops, one's heart, nervous system and other organs can't work normally. Left untreated, hypothermia can eventually lead to complete failure of your heart and respiratory system and eventually to death.
Ref: https://www.mayoclinic.org/diseases-conditions/hypothermia/symptoms-causes/syc-20352682

Seemingly small temperature differences from equilibrium can have significant consequences to a system.
 
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  • #4
Gondur said:
Equilibrium Climate Sensitivity - what is the relevance of the word 'equilibrium' - why not 'climate sensitivity?'
Hope you can help.
At the very center of the theory of AGW, is the idea that doubling the CO2 level would create an energy imbalance
between the energy entering the top of the atmosphere and the energy leaving the top of the atmosphere for space.
This imbalance will force portions of the atmosphere to increase in temperature.
The forcing of the atmospheric gas temperature would be rather quick, but other parts of the system (Oceans, soil, ect.)
could talk much longer, even decades to come back into equilibrium with the new energy level.
 

What is Equilibrium Climate Sensitivity (ECS)?

Equilibrium Climate Sensitivity (ECS) is a measure of how much the Earth's average temperature will increase if the amount of carbon dioxide in the atmosphere doubles. It is often used as a key metric for predicting the impacts of climate change.

How is Equilibrium Climate Sensitivity calculated?

Equilibrium Climate Sensitivity is typically calculated using climate models, which simulate the Earth's climate system and predict how it will respond to changes in carbon dioxide levels. These models take into account various factors such as the Earth's energy balance, atmospheric and oceanic circulation, and feedback mechanisms to estimate the change in temperature that would occur with a doubling of carbon dioxide.

What is the current estimated range for Equilibrium Climate Sensitivity?

The current estimated range for Equilibrium Climate Sensitivity is between 1.5°C to 4.5°C, with a best estimate of 3°C. This range has been determined by multiple studies and is based on a combination of climate models, observations of past climate change, and feedback mechanisms.

Why is Equilibrium Climate Sensitivity important?

Equilibrium Climate Sensitivity is important because it helps us understand the potential impacts of climate change. A higher ECS means that the Earth's temperature will increase more with a doubling of carbon dioxide, leading to more severe consequences such as sea level rise, extreme weather events, and disruptions to ecosystems.

Can Equilibrium Climate Sensitivity change over time?

Yes, Equilibrium Climate Sensitivity can change over time. Factors such as changes in atmospheric composition, land use, and natural variability can impact ECS. Additionally, as our understanding of the climate system improves, the estimated range for ECS may also change. Ongoing research and observations will continue to refine our understanding of ECS and its potential changes.

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