Geography • World GeographyHard
Which specific isotopic proxy analysis conducted on high-resolution ice cores extracted from Himalayan glaciers provides paleoclimatologists with historical records of past atmospheric temperature and monsoon intensity?
A. Carbon-14 dating of organic pollen grains
B. Oxygen-18 to Oxygen-16 isotope ratio variations in frozen precipitation✓ Correct Answer
C. Potassium-argon dating of volcanic ash layers
D. Dendrochronological ring-width measurements of buried wood
💡 Solution & Explanation
The ratio of Oxygen-18 to Oxygen-16 isotopes in ice cores serves as a reliable paleothermometer because colder temperatures preferentially deplete heavier oxygen isotopes in precipitation, allowing scientists to reconstruct past climate shifts. Carbon-14 is used for organic material dating, potassium-argon for ancient volcanic rocks, and dendrochronology for tree rings rather than deep ice sheets. Ice core studies in high Asian mountain ranges provide crucial data on historical fluctuations in monsoon strength and regional warming trends.
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