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An ice-free cretaceous? Results from climate model simulations
Science (New York, N.Y.)
|May 1, 1981
Summary
Investigating the mid-Cretaceous warm climate reveals geography changes were key. However, accurate temperature simulations require including cloud and heat transport feedback mechanisms, prompting a reevaluation of paleoclimate data.
Area of Science:
- Paleoclimatology
- Climate Modeling
- Earth Science
Background:
- The mid-Cretaceous period (100 million years ago) is characterized by a hypothesized warm and equable global climate.
- Understanding the mechanisms driving this climate is crucial for reconstructing Earth's past environments.
Purpose of the Study:
- To quantitatively investigate the mechanisms responsible for the mid-Cretaceous warm and equable climate.
- To assess the role of geographical changes and feedback mechanisms in simulating Cretaceous climate.
Main Methods:
- Utilized a climate model based on zonal energy balance for quantitative simulations.
- Performed simulations to analyze the meridional distribution of Cretaceous temperatures.
Main Results:
- Geographical changes were identified as significant factors contributing to climatic shifts during the Cretaceous.
- Simulations indicated that additional physical feedback mechanisms, such as cloud and heat transport changes, are necessary for accurately modeling Cretaceous temperatures.
Conclusions:
- Past geographical configurations played a role in Cretaceous climate change.
- Accurate simulation of Cretaceous meridional temperature distribution necessitates the inclusion of feedback mechanisms.
- Paleoclimatologists should critically re-examine existing data and interpretations of Cretaceous tropical and polar surface temperatures.
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