Marine reservoir variation in the Bismarck region: an evaluation of spatial and temporal change in delta R and R over the last 3000 years

Petchey, Fiona and Ulm, Sean (2012) Marine reservoir variation in the Bismarck region: an evaluation of spatial and temporal change in delta R and R over the last 3000 years. Radiocarbon, 54 1: 45-58. doi:10.2458/azu_js_rc.v54i1.13050


Author Petchey, Fiona
Ulm, Sean
Title Marine reservoir variation in the Bismarck region: an evaluation of spatial and temporal change in delta R and R over the last 3000 years
Formatted title
Marine reservoir variation in the Bismarck region: an evaluation of spatial and temporal change in ΔR and R over the last 3000 years
Journal name Radiocarbon   Check publisher's open access policy
ISSN 0033-8222
Publication date 2012-01-01
Sub-type Article (original research)
DOI 10.2458/azu_js_rc.v54i1.13050
Open Access Status DOI
Volume 54
Issue 1
Start page 45
End page 58
Total pages 14
Place of publication Tucson, AZ, United States
Publisher University of Arizona, Department of Geosciences
Collection year 2013
Language eng
Formatted abstract
Interactions between islands, ocean currents, and winds cause large-scale eddies and upwelling in the lee of islands that can result in spatial variation in the marine radiocarbon reservoir. For waters around New Ireland and the Bismarck Sea, ∆R values ranging from 365 to –320 14C yr have been reported (Kirch 2001; Petchey et al. 2004). Petchey et al. (2004) proposed that some of this variation was caused by seasonal reversals in the South Equatorial Current and North Equatorial Counter Current system, combined with Ekman upwelling from the Equator. McGregor et al. (2008) suggested additional complexity within this region caused by a change in the reservoir value over time in response to changing climatic conditions. We present a series of 14 new and extant published ∆R and R values on historic shells, combined with 8 values from archaeological terrestrial/marine pairs and U-Th dated coral, that support observations of localized variability caused by a complex interplay between seasonal currents, riverine input, and ocean eddies. On the basis of these values and oceanographic data, we divide the Bismarck Sea surface marine 14C reservoir into 6 tentative subregions. In particular, our results support significant variation within channels at the southwest and southeast ends of New Britain and towards the equatorial boundary of the sea. Our results indicate that within the Bismarck Sea geographical variation appears to be more extreme than temporal over the last 3000 yr.
Keyword Papua New Guinea
Radiocarbon age calibration
Southwest Pacific Ocean
Bomb radiocarbon
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Aboriginal and Torres Strait Islander Studies Unit Publications
Official 2013 Collection
 
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