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Response to Comment on "Long-term climate forcing by atmospheric oxygen concentrations"
Christopher J Poulsen1, Clay Tabor2, Joseph White3
1Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA. poulsen@umich.edu.
A study on atmospheric composition found that reduced pressure broadening from low oxygen may cause cooling. However, global climate models show cloud and water vapor feedbacks lead to atmospheric warming instead.
Area of Science:
- Atmospheric science
- Climate modeling
- Radiative transfer
Background:
- A previous hypothesis suggested low oxygen decreases pressure broadening, increasing outgoing radiation and causing atmospheric cooling.
- Understanding atmospheric radiative transfer is crucial for climate predictions.
Purpose of the Study:
- To investigate the impact of pressure broadening on atmospheric temperature.
- To evaluate the role of cloud and water vapor feedbacks in climate models.
Main Methods:
- Utilized a global climate model to simulate atmospheric conditions.
- Analyzed the effects of varying oxygen levels on radiative transfer and climate feedbacks.
Main Results:
- Cloud and water vapor feedbacks were found to counteract the cooling effect of reduced pressure broadening.
- Simulations indicated a net atmospheric warming, contrary to the initial hypothesis.
Conclusions:
- The initial hypothesis regarding cooling due to decreased pressure broadening in low-oxygen atmospheres is challenged.
- Cloud and water vapor feedbacks play a significant role in determining the net climate response to changes in atmospheric composition.
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