(Table 1) Age determination of sediment core KH92-15cBX

DOI

A sediment core collected from Caroline Basin, western tropical Pacific was analyzed for lipid class compounds (aliphatic hydrocarbons, long-chain alkenones, fatty alcohols, sterols, and fatty acids) to reconstruct changes in paleoenvironments during the last 23.3 kyr. Around the boundary between the glacial and deglacial periods (19 ka), mass accumulation rates of terrestrial biomarkers, C25-C35 n-alkanes, C24-C28 fatty alcohols, and C23-C34 fatty acids, were found to decrease significantly and stayed in low levels during the deglaciation, suggesting a reduction of atmospheric transport of continental materials during that time. In the same period, mass accumulation rates of C17-C20 n-alkanes, pristane, cholesterol, and dinosterol which are thought to be mainly derived from marine organisms also decreased, suggesting a significant drop of marine biological productivity. The decreased biological productivity in the western tropical Pacific may be caused by a reduced supply of nutrients from upwelling which is associated with decreased wind velocity and/or caused by a shift of upwelling zone.

14C ages were calculated with a 5568-year half-life.

Supplement to: Ohkouchi, Naohiko; Kawamura, Kenji; Taira, Asahiko (1997): Fluctuations of terrestrial and marine biomarkers in the western tropical Pacific during the last 23,300 years. Paleoceanography, 12(4), 623-630

Identifier
DOI https://doi.org/10.1594/PANGAEA.876563
Related Identifier https://doi.org/10.1029/97PA00820
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.876563
Provenance
Creator Ohkouchi, Naohiko ORCID logo; Kawamura, Kenji (ORCID: 0000-0003-1163-700X); Taira, Asahiko
Publisher PANGAEA
Publication Year 1997
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 17 data points
Discipline Earth System Research
Spatial Coverage (141.867 LON, 3.533 LAT); Caroline Basin, western tropical Pacific