Galactic Cosmic Rays - Clouds Effect and Bifurcation Model of the Earth Global Climate. Part 2. Comparison of Theory with Experiment

TL;DR

This paper compares an energy-balance climate model with paleotemperature data, proposing a bifurcation model to explain abrupt climate changes and discussing the climate sensitivity of atmospheric water and CO2 effects over geological timescales.

Contribution

It introduces a bifurcation model explaining climate bifurcations and hysteresis, integrating stochastic resonance and water sensitivity concepts with paleoclimate data.

Findings

The model reproduces past temperature variations.

Climatic sensitivity of atmospheric water exhibits hysteresis behavior.

The approach aligns with ice volume and isotope data over 1000 kyr.

Abstract

The solution of energy-balance model of the Earth global climate and the EPICA Dome C and Vostok experimental data of the Earth surface palaeotemperature evolution over past 420 and 740 kyr are compared. In the framework of proposed bifurcation model (i) the possible sharp warmings of the Dansgaard-Oeschger type during the last glacial period due to stochastic resonance is theoretically argued; (ii) the concept of climatic sensitivity of water in the atmosphere, whose temperature instability has the form of so-called hysteresis loop, is proposed, and based of this concept the time series of global ice volume over the past 1000 kyr, which is in good agreement with the time series of delta O-18 concentration in the sea sediments, is obtained; (iii) the so-called "CO2 doubling" problem is discussed