首页|Revised ?R values for the Barents Sea and its archipelagos as a pre-requisite for accurate and robust marine-based C-14 chronologies
Revised ?R values for the Barents Sea and its archipelagos as a pre-requisite for accurate and robust marine-based C-14 chronologies
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NSTL
Elsevier
The calibration of marine C-14 dates requires the incorporation of regionally specific marine reservoir offsets known as delta R, essential for accurate and meaningful inter-archive comparisons. Revised, regional delta R ("AR(R)') values for the Barents Sea are presented for molluscs and cetaceans for the two latest iterations of the marine calibration curve, based on previously published pre-bomb live-collected and radiocarbon-dated samples ("AR(L)'; molluscs: n = 16; cetaceans: n = 18). Molluscan ARR, determined for four broad regional oceanographic settings, are: western Svalbard (including Bj & oslash;rn & oslash;ya), -61 +/- 37 C-14 yrs (Marine20), 94 +/- 38 C-14 yrs (Marine13); Franz Josef Land, -277 +/- 57 C-14 yrs (Marine20), -122 +/- 38( 14)C yrs (Marine13); Novaya Zemlya, -156 +/- 73 C-14 yrs (Marine20), 0 +/- 76 C-14 yrs (Marine13); northern Norway, -86 +/- 39 C-14 yrs (Marine20), 74 +/- 24 C-14 yrs (Marine13). Molluscan ARR values are considered applicable to other marine carbonate materials (e.g., fora-minifera, ostracods). Cetacean ARR are determined for toothed (n = 10) and baleen (n = 8) whales, and a combined toothed-baleen group (n = 18): toothed,-161 +/- 41( 14)C yrs (Marine20), 1 +/- 41( 14)C yrs (Marine13); baleen, -158 +/- 43 C-14 yrs (Marine20), 8 +/- 41 C-14 yrs (Marine13); combined baleen-toothed whales,-160 +/- 41( 14)C yrs (Marine20), 4 +/- 49 C-14 yrs (Marine13). Where identification and separation of baleen and toothed whales is impossible the combined AR(R) term may be used. However, we explicitly discourage the application of existing cetacean AR(R) terms to other marine mammals. Our new ARR values are applicable for as long as those broad oceanographic conditions (circulation and ventilation) have persisted, i.e., through the Holocene. We recom-mend using the latest iteration of the marine calibration curve, Marine20, which seems to better capture the time-variant nature of R compared to Marine13. More delta R-L datapoints for both molluscs and cetaceans would improve the accuracy and precision of delta R-R. In the meantime, our new delta R terms facilitate the calibration of marine( 14)C dates across the region, paving the way for meaningful and accurate late Quaternary histories and inter-regional comparisons.
Reservoir correctionCalibrationArcticRadiocarbonMolluscsCetaceansRADIOCARBON AGE CALIBRATIONRESERVOIR AGEICE CONDITIONSSVALBARDNORTHVARIABILITYGROWTHOCEANSPITSBERGENHOLOCENE
Pienkowski, Anna J.、Husum, Katrine、Furze, Mark F. A.、Missana, Amandine F. J. M.、Irvali, Nil、Divine, Dmitry V.、Eilertsene, Varin Traelvik
NSTL
Elsevier
