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Orbital variations, climate and paleoecology
1Dept of Geography, University of Oregon, Eugene, OR 97403, USA.
Trends in Ecology & Evolution
|January 14, 2011
Summary
Earth's orbital variations drive ice ages by altering solar radiation, influencing climate patterns and species migration. These predictable cycles have shaped ecosystems throughout history, even without ice.
Area of Science:
- Earth Science
- Paleoclimatology
- Evolutionary Biology
Background:
- Ice ages are now understood to be governed by predictable variations in Earth's orbit.
- These orbital variations influence solar radiation distribution, impacting global climate patterns.
- Environmental changes driven by orbital cycles affect both terrestrial and marine ecosystems.
Purpose of the Study:
- To explain the deterministic link between Earth's orbital variations and ice age cycles.
- To highlight how solar radiation changes affect various climate components.
- To discuss the ecological responses of species to these long-term environmental shifts.
Main Methods:
- Analysis of deterministic variations in Earth's orbit (10^3 to 10^5 year cycles).
- Correlation of solar radiation distribution with climate phenomena (ice-sheet dynamics, ocean temperatures, monsoons).
- Examination of ecological history and species adaptation in response to environmental changes.
Main Results:
- Orbital variations directly control the building and melting of continental ice sheets.
- These variations also influence midlatitude temperatures, tropical ocean upwelling, and monsoon strength.
- Species have adapted through range migration to maintain genetic coherence amidst environmental flux.
Conclusions:
- Earth's orbital cycles are a primary driver of climate change and ice ages.
- These cycles have historically influenced diverse environments and necessitated species adaptation.
- Understanding these orbital mechanics is key to interpreting past ecological dynamics.
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