Reworked coccoliths: proxy to reconstruct Volturno hydrographic basin runoff variation ( central Tyrrhenian Sea ) for the last 350 years

The preliminary results of a high resolution study carried out on C5_SW104 core (108cm), recovered at 92m depth in the Gulf of Gaeta (central Tyrrhenian Sea) , in which wecompare the distribution pattern of reworked coccoliths versus the runoff model simulation (from 1951 to 2013 - CIRCE project) for the Volturno river hydrographic basin and Atlantic Multidecadal Oscillation (AMO)reconstructed signal, are presented. The aim of this research is to achieve a new algorithm that will allow to extend the reconstruction of the variations of Volturno runoff back to 2000 years ago. The high-resolution study of the C5_SW104 core identified a broad correspondence between the reworking fluctuations and the runoff model data. These preliminary results would confirm the reliability of the reworked coccoliths to reconstruct the runoff quantitative fluctuations in the last two millennia. In addition, wavelet and spectral analysis carried out on reworked coccoliths and AMO index show the occurrence of a distinct periodicity at ca. 80 years. The comparison between the reworked coccoliths filtered signal (80 years frequency band) with the AMO index highlights a robust anticorrelation.