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AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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Rezumat articol ediţie STUDIA UNIVERSITATIS BABEŞ-BOLYAI În partea de jos este prezentat rezumatul articolului selectat. Pentru revenire la cuprinsul ediţiei din care face parte acest articol, se accesează linkul din titlu. Pentru vizualizarea tuturor articolelor din arhivă la care este autor/coautor unul din autorii de mai jos, se accesează linkul din numele autorului. |
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STUDIA GEOLOGIA - Ediţia nr.1 din 2007 | |||||||
Articol: |
PALEOCLIMATE RECONSTRUCTION DERIVED FROM SPELEOTHEM STRONTIUM AND δ13C IN CENTRAL FLORIDA. Autori: LIMARIS R. SOTO, PHILIP VAN BEYNEN, KALI PACE-GRACZYK. |
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Rezumat: A speleothem from central Florida, USA was analyzed for its variability for trace elements of strontium and carbon isotopes. Thermal ionization mass spectrometry of uranium-thorium isotopes indicates the speleothem was precipitated during the last 4,000 years. Sr concentration is negatively correlated with δ13C, as a function of soil productivity. Coeval changes in the Sr content and δ13C signals, as induced by soil productivity, are explained by changing precipitation above the cave. Both proxies record a 170-180 year solar cycle that has also been found in marine records from the Gulf of Mexico and elsewhere. Consequently, this result provides evidence of an extraterrestrial driven modulator of precipitation in central Florida. | |||||||
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