Greenhouse Gases (GHGs): Gases like CO2, methane, and nitrous oxide that trap infrared radiation emitted by Earth's surface, contributing to the greenhouse effect and global warming.
Global Temperature Increase: The observed rise in Earth's average surface temperature, approximately 1°C over the past 150 years, primarily due to human activities.
Climate Cycles (Quaternary): Recurrent periods of glaciations (ice ages) and interglacial warm periods, driven by orbital variations and feedback mechanisms.
Isotope Thermometry (δ18O): A method measuring oxygen isotope ratios in ice cores and marine sediments to reconstruct past temperatures; lower δ18O indicates colder climates.
Milankovitch Cycles: Cyclical variations in Earth's orbit and axial tilt (eccentricity, obliquity, precession) that influence insolation and climate patterns over tens to hundreds of thousands of years.
1. What does ice core isotope analysis primarily measure to reconstruct past climate conditions?
2. During which geological period did the significant glaciation event known as the Carboniferous-Permian glaciation occur?
3. What is the primary function of Quaternary Climate Cycles in Earth's climate system?
Recent climate warming — cause?
Human greenhouse gas emissions drive recent warming.
Greenhouse gases — role?
Trap infrared radiation, cause greenhouse effect.
Quaternary cycles — definition?
Glaciation and interglacial periods over last 2.6 million years.
Ice core isotopes — proxy for?
Past temperatures via δ18O ratios.
Milankovitch cycles — influence?
Orbital variations affecting insolation and climate.
Tectonic activity — climate effect?
Alters ocean currents, CO₂, and mountain uplift.
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