[Paper Review] Entropy Shows that Global Warming Should Cause Increased Variability in the Weather

John Michael Williams|ArXiv.org|Aug 28, 2000

Earth Systems and Cosmic Evolution3 references3 citations

TL;DR

This paper argues that global warming increases atmospheric entropy, leading to greater available free energy for weather systems, which inherently amplifies meteorological variability. Using a thermodynamic approximation of global entropy, the author demonstrates that rising temperatures should cause increased weather variability, providing a fundamental physical basis for observed and projected climate extremes.

ABSTRACT

Elementary physical reasoning seems to leave it inevitable that global warming would increase the variability of the weather. The first two terms in an approximation to the global entropy are used to show that global warming has increased the free energy available to drive the weather, and that the variance of the weather should increase correspondingly.

Motivation & Objective

• To establish a theoretical link between global warming and increased atmospheric weather variability using thermodynamic principles.
• To analyze how rising global temperatures affect the free energy available to drive atmospheric dynamics.
• To apply entropy-based reasoning to predict changes in meteorological variance due to climate change.
• To provide a physical mechanism explaining why climate change may lead to more extreme and variable weather patterns.
• To demonstrate that increased entropy from global warming implies greater atmospheric instability and variability.

Proposed method

• Uses the first two terms of a thermodynamic approximation to global entropy as a proxy for atmospheric energy availability.
• Applies the concept of free energy (available work) in thermodynamics to the Earth's climate system.
• Relates changes in global temperature to changes in the variance of atmospheric processes via entropy increase.
• Models the atmosphere as a heat engine operating between the warm surface and cold upper atmosphere, with entropy as a measure of available work.
• Derives a relationship between temperature rise and increased variance in weather patterns through entropy and energy budget analysis.
• Uses physical reasoning grounded in statistical mechanics and thermodynamics to infer increased atmospheric variability.

Experimental results

Research questions

• RQ1 How does global warming affect the available free energy in the Earth's atmosphere?
• RQ2 What is the thermodynamic relationship between rising global temperatures and atmospheric variability?
• RQ3 Can entropy be used as a predictor of increased weather variability under global warming?
• RQ4 To what extent does increased atmospheric entropy imply greater meteorological variance?
• RQ5 What physical mechanism explains why global warming may lead to more extreme and variable weather events?

Key findings

• Global warming increases the total entropy of the Earth's climate system, particularly through higher surface temperatures.
• The increase in entropy corresponds to a rise in available free energy for atmospheric circulation, enhancing weather system intensity.
• The variance of weather patterns is predicted to increase due to the thermodynamic relationship between entropy and available work.
• The model suggests that even small temperature increases can lead to significant increases in atmospheric variability over time.
• The theoretical framework provides a physical basis for the observed increase in extreme weather events under global warming.
• The results are consistent with the idea that a warmer climate is inherently more variable due to thermodynamic constraints.