| Autor: |
Druffel, ER, Griffin, S, Hwang, J, Komada, T, Beaupre, SR, Druffel-Rodriguez, KC, Santos, GM, Southon, J |
| Jazyk: |
angličtina |
| Rok vydání: |
2004 |
| Zdroj: |
Druffel, ER; Druffel, ER; Griffin, S; Hwang, J; Komada, T; Beaupre, SR; et al.(2004). Variability of radiocarbon during the 1760s in monthly corals from the Galapagos Islands. Radiocarbon, 46(2), 627-631. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/3jk27557 |
| Popis: |
Radiocarbon (∆14C) measurements of monthly samples from a Galapagos surface coral are among the first data sets from the new Keck Carbon Cycle Accelerator Mass Spectrometry laboratory at the University of California, Irvine. An average ∆14C value of –62‰ is obtained for 144 measurements of samples from monthly coral bands that lived from about AD 1760–1771 (±6 yr). High ∆14C values were found during January through March, when upwelling was weak or absent at the Galapagos Islands. Low ∆14C values were obtained mid-year during strong upwelling. The average seasonal variability of ∆14C was 15–25‰, which is greater than that at other tropical and subtropical locations in the Pacific Ocean because of intense seasonal upwelling at this site. Periods of sustained high ∆14C values were found during 1762–1763 and 1766. A spectral analysis revealed that the spectral density for the ∆14C data displays most of its variance at the 5-yr cycle, which is reflective of El Niño periodicity during the 20th century. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
