Clipperton Atoll replicated coral Sr/Ca-SST and reconstructed δ¹⁸O of seawater composite (1874-1994 CE)


Sub-seasonally resolved and replicated coral Sr/Ca time series at Clipperton Atoll (10°18'N, 109°13'W) in the eastern Pacific are assessed as a sea surface temperature (SST) proxy in this region with small seasonal SST variability. The composite coral Sr/Ca time series is a partially replicated record of three live and one sub-modern colony of Porites lobata extending back to 1874. Large inter-colony coral Sr/Ca offsets equate to relative SST differences of 0.6 to 4.3 °C and limit the ability to reconstruct absolute SST changes. Moreover, the replication method revealed a 12-year section of growth in one colony where mean Sr/Ca was anomalously low (~ 1 °C higher SST) relative to the other colonies without evidence of diagenesis or other significant skeletal alterations. The presence of this anomalous interval supports the need for multi-coral Sr/Ca replication in specific sites or regions. The Clipperton Composite Sr/Ca anomaly record is significantly coherent (r = 0.71-0.76, p < 0.001) with gridded instrumental SSTs but with larger amplitude decadal variance that appears to more accurately represent actual SST variability at Clipperton. The amplitude of the secular warming trend during the last century at Clipperton is 0.3 to 0.6 °C larger (~ twice as large) than the trend in the poorly "ground-truthed" instrumental SST records for the region. The interannual and decadal variability in Clipperton coral Sr/Ca demonstrates strong coherence to the Pacific Decadal Oscillation and the El Niño/Southern Oscillation (ENSO) with reduced ENSO variability from 1920 to late 1930s and enhanced variability in the late twentieth century.

The composite coral Sr/Ca and d18Osw time series are partially replicated records from three live and one sub-modern colony of Porites lobata extending back to 1874.

Supplement to: Wu, Henry C; Moreau, Mélanie; Linsley, Braddock K; Schrag, Daniel P; Corrège, Thierry (2014): Investigation of sea surface temperature changes from replicated coral Sr/Ca variations in the eastern equatorial Pacific (Clipperton Atoll) since 1874. Palaeogeography, Palaeoclimatology, Palaeoecology, 412, 208-222

Related Identifier
Metadata Access
Creator Wu, Henry C ORCID logo; Moreau, Mélanie; Linsley, Braddock K ORCID logo; Schrag, Daniel P; Corrège, Thierry
Publisher PANGAEA
Publication Year 2018
Rights Creative Commons Attribution 4.0 International;
OpenAccess true
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 8630 data points
Discipline Earth System Research
Spatial Coverage (-109.217 LON, 10.300 LAT); Clipperton Atoll