Centuries of Marine Radiocarbon Reservoir Age Variation Within Archaeological <i>Mesodesma Donacium</i> Shells from Southern Peru

Jones, Kathleen W.; Hodgins, Gregory W. L.; Etayo-Cadavid, Miguel F.; Andrus, C. Fred T.; Sandweiss, Daniel H.

doi:10.1017/s0033822200046282

Cited by 26 publications

(16 citation statements)

References 28 publications

(46 reference statements)

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“…Previous research has documented significant intrashell variability in 14 C content in mollusks from California and Peru Jones et al 2007Jones et al , 2010 and more limited variability in specimens from Georgia's Atlantic coast (Thomas et al 2013). The variability in 14 C from Peru and California is thought to stem largely from seasonal variations in coastal upwelling, but both Culleton Table 2.…”

Section: Discussionmentioning

confidence: 99%

Radiocarbon Variability in Crassostrea virginica Shells from the Chesapeake Bay, USA

Rick

Henkes²

2014

Radiocarbon

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Fifteen accelerator mass spectrometry (AMS) radiocarbon dates obtained on small subsections of archaeological and historical Crassostrea virginica (eastern oyster) shells provide a means to test for intrashell variability in 14 C content in late Holocene Chesapeake Bay mollusks. Although salinity and temperature vary considerably throughout the year, the Chesapeake Bay generally lacks the strong coastal upwelling present in the eastern Pacific where intrashell 14 C variability is significant. Intrashell variability in Chesapeake Bay C. virginica is between ~60-100 14 C yr, considerably smaller than the 120-530 14 C yr ranges noted for shells from strong upwelling zones. As a precaution, we follow Culleton et al. (2006) and argue that large subsamples of shells across multiple growth increments are ideal for AMS 14 C dating of mollusks to offset potential issues of intrashell 14 C variability.

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Section: Discussionmentioning

confidence: 99%

Radiocarbon Variability in Crassostrea virginica Shells from the Chesapeake Bay, USA

Rick

Henkes²

2014

Radiocarbon

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“…Some studies have reported short‐term fluctuations of Δ R , for example at Fanning Island in the equatorial Pacific (Grottoli et al , ) and off the coast of Peru (Jones et al , , ). Short‐term fluctuations of Δ R have also been reported in the Kuroshio region, including at Ishigaki Island (Hideshima et al , ; Araoka et al , ), although the data used in these studies are not continuous spatially or temporally, which makes it difficult to draw conclusions about the cause of the fluctuations.…”

Section: Introductionmentioning

confidence: 99%

Short‐term fluctuations in regional radiocarbon reservoir age recorded in coral skeletons from the Ryukyu Islands in the north‐western Pacific

Hirabayashi¹,

Yokoyama²,

Suzuki

et al. 2017

J Quaternary Science

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Radiocarbon (14C) dating is a widely used and powerful tool for determining the ages of samples in studies of palaeoclimatology, palaeoseismology and archaeology. 14C ages of marine samples often require correction for local reservoir age (ΔR). Although ΔR in the mid‐ to low latitudes has varied through time, few spatiotemporal reconstructions of ΔR have been published for those regions. Here we report on new and previously published ΔR data for the early 1900s to 1950 obtained from coral skeletons from the Kuroshio region off southern Japan. The data presented here show a marked positive‐to‐negative shift of ΔR from the early 1900s to the 1940s, which has important implications for calibration of radiocarbon ages in the region and for understanding the relationship of ΔR in the western Pacific with both the El Niño–Southern Oscillation and the Pacific Decadal Oscillation.

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“…For ancient periods, variations of mean paleoupwelling intensity can be indicated by variations of marine reservoir age estimated by the radiocarbon analysis of contemporaneous marine shells and plant remains Ortlieb et al, 2011]. However, this method has significant uncertainties because of potential old wood effect and intrashell variability of reservoir age [Jones et al, 2007[Jones et al, , 2010. We propose here to use an alternative paleoenvironmental archive that would yield independent estimates of the coastal upwelling intensity and insights into seasonal scale productivity processes.…”

Section: Introductionmentioning

confidence: 99%

Reconstructing past upwelling intensity and the seasonal dynamics of primary productivity along the Peruvian coastline from mollusk shell stable isotopes

Sadler

Carré

Azzoug

et al. 2012

Geochem Geophys Geosyst

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[1] We present here a potential new method to evaluate past variations of the mean intensity of Peruvian coastal upwelling and of the seasonal timing of phytoplankton blooms. This method uses a combination of the monthly carbon and oxygen isotopic signals preserved in fossil mollusk shells, and a series of corrections Copyright 2012 by the American Geophysical Union 1 of 17 to extract the variations of the dissolved inorganic carbon (DIC) d 13 C. Based on the analysis of five shell samples (85 shells in total) from the southern Peruvian coast, we suggest that the mean coastal upwelling intensity can be determined from a linear relationship between average values of corrected shell d 13 C and d 18 O. This new potential proxy would bring additional independent information valuable to interpret paleoproductivity changes reconstructed from marine sediment of the nearby continental shelf. Results obtained on fossil samples from the middle Holocene show an increase in upwelling intensity during this period associated to a spatial reorganization of upwelling centers along the South Peruvian coast. At the seasonal scale, corrected shell d 13 C enrichment indicates a phytoplankton bloom. Seasonal timing of phytoplankton blooms can be estimated by the lag with the annual temperature cycle reproduced by shell d 18 O monthly variations. The results obtained with two modern shell samples indicate phytoplankton blooms occurring during summer and fall, consistently with in situ productivity observations. Our method relies on revisited assumptions about the influence of temperature and metabolism in mollusk shell d 13 C. We further discussed the validity of these assumptions and the potential implications for the interpretation of similar data sets.

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Centuries of Marine Radiocarbon Reservoir Age Variation Within Archaeological Mesodesma Donacium Shells from Southern Peru

Cited by 26 publications

References 28 publications

Radiocarbon Variability in Crassostrea virginica Shells from the Chesapeake Bay, USA

Radiocarbon Variability in Crassostrea virginica Shells from the Chesapeake Bay, USA

Short‐term fluctuations in regional radiocarbon reservoir age recorded in coral skeletons from the Ryukyu Islands in the north‐western Pacific

Reconstructing past upwelling intensity and the seasonal dynamics of primary productivity along the Peruvian coastline from mollusk shell stable isotopes

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