Radiolarian census counts and radiolarian-based temperature reconstructions from sediment cores in the Pacific Ocean ...

• Main Authors: Hernández-Almeida, Iván, Boltovskoy, Demetrio, Kruglikova, Svetlana B, Cortese, Giuseppe
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2020
• Subjects: core-tops; Pacific Ocean; Radiolaria; Bering Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.923059; https://doi.pangaea.de/10.1594/PANGAEA.923059

In this study, we use published radiolarian census counts from 801 core-tops distributed across the Pacific Ocean, to investigate which environmental factors drive the assemblages. We harmonized taxonomically the modern dataset, and using multivariate statistical analyses, we determined that sea surface temperature at 10 m (SST10) is the most important variable influencing the changes observed in the radiolarian assemblages. The calibration method weighted-mean modern analogue technique with five analogs (WMAT-K5) corrected for autocorrelation using a cut-off distance of 500 km, showed a performance of R2cv = 0.83; RMSEP = 3.8 °C. This calibration method was then applied to taxonomically harmonized radiolarian census counts from 31 cores located in the Bering Sea, Western Pacific marginal seas, and Southwest and Eastern Equatorial Pacific, with some of these records covering at least the last 165 ka. We assessed the analogue quality and significance of the downcore SST10 reconstructions in all of them. We ...