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| Ραδιοχρονολόγηση× | Δείκτης Τυποποιημένης Βροχόπτωσης× | |
|---|---|---|
| Πεδίο | Γεωφυσική | Γεωφυσική |
| Οικογένεια | Process / pipeline | Process / pipeline |
| Έτος προέλευσης≠ | 1949 | 1993 |
| Δημιουργός≠ | Willard Libby | Thomas McKee, Neil Doesken, and John Kleist |
| Τύπος≠ | Chronometric method based on ¹⁴C decay | Probabilistic drought indicator |
| Θεμελιώδης πηγή≠ | Libby, W. F. (1949). Radiocarbon dating. University of Chicago Press. link ↗ | McKee, T. B., Doesken, N. J., & Kleist, J. (1993). The relationship of drought frequency and duration to time scales. Proceedings of the Eighth Conference on Applied Climatology, 179-184. link ↗ |
| Εναλλακτικές ονομασίες≠ | ¹⁴C dating, Carbon-14 dating | SPI |
| Συναφείς | 3 | 3 |
| Σύνοψη≠ | Radiocarbon dating is a radiometric technique that determines the age of organic materials by measuring the radioactive decay of ¹⁴C (carbon-14), a rare isotope produced in the atmosphere by cosmic ray interactions. Developed by Willard Libby in 1949, radiocarbon dating became a foundational method in archaeology, paleoclimate studies, and geology, enabling dating of organic materials from the past ~50,000 years with typical precision of ±50–100 years. | The Standardized Precipitation Index (SPI) is a climate index that quantifies precipitation anomalies relative to historical norms, standardized to account for differences in precipitation climatology across regions. Introduced by McKee, Doesken, and Kleist in 1993, SPI has become a primary tool for drought detection and characterization, adopted by meteorological agencies worldwide for operational drought monitoring and early warning systems. |
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