Ogasawara winter Sr/Ca and U/Ca data of coral core OGA-02-1 and PDO reconstruction (coral-geoduck index)

The Pacific Decadal Oscillation (PDO), the leading mode of sea surface temperature (SST) anomalies in the extratropical North Pacific Ocean, has widespread impacts on precipitation in the Americas and marine fisheries in the North Pacific. However, marine proxy records with a temporal resolution that resolves interannual to interdecadal SST variability in the extratropical North Pacific are extremely rare. Here we demonstrate that the winter Sr/Ca and U/Ca records of an annually-banded reef coral from the Ogasawara Islands in the western subtropical North Pacific are significantly correlated with the instrumental winter PDO index over the last century. The reconstruction of the PDO is further improved by combining the coral data with an existing eastern mid-latitude North Pacific growth ring record of geoduck clams. The spatial correlations of this combined index with global climate fields suggest that SST proxy records from these locations provide potential for PDO reconstructions further back in time.

Distribution of heavy minerals in sediment cores MSSTS-1 and DVDP-12

This study encompasses an investigation of the heavy mineral composition of early Oligocene-Quaternary glacial and glaciomarine sediment sequences from the Victoria Land Basin and the fjords of the South Victoria Land, Ross Sea, Antarctica. The sediment cores used were recovered during different international drilling campaigns (DVDP- 12, CIROS-2, MSSTS-l, CRP-l, CRP-212A). The main objectives were to identify possible source rocks and to unravel the provenance regions of different heavy minerals and mineral groups. Moreover, with the available data an attempt to reconstruct the general development and codiguration of the Antarctic ice sheets during the Cenozoic was also made