@article {castrillejo_comparability_2023,
	title = {Comparability of Radiocarbon Measurements in Dissolved Inorganic Carbon of Seawater Produced at ETH-Zurich},
	journal = {Radiocarbon},
	year = {2023},
	note = {Publisher: Cambridge University Press},
	month = {03/2023},
	pages = {1{\textendash}10},
	abstract = {Radiocarbon observations (Δ14C) in dissolved inorganic carbon (DIC) of seawater provide useful information about ocean carbon cycling and ocean circulation. To deliver high-quality observations, the Laboratory of Ion Beam Physics (LIP) at ETH-Zurich developed a new simplified method allowing the rapid analysis of radiocarbon in DIC of small seawater samples, which is continually assessed by following internal quality controls. However, a comparison with externally produced 14C measurements to better establish an equivalency between methods was still missing. Here, we make the first intercomparison with the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility based on 14 duplicate seawater samples collected in 2020. We also compare with prior deep-water observations from the 1970s to 1990s. The results show a very good agreement in both comparisons. The mean Δ14C of 12 duplicate samples measured by LIP and NOSAMS were statistically identical within one sigma uncertainty while two other duplicate samples agreed within two sigma. Based on this small number of duplicate samples, LIP values appear to be slightly lower than the NOSAMS values, but more measurements will be needed for confirmation. We also comment on storage and preservation techniques used in this study, including the freezing of samples collected in foil bags.},
	keywords = {14C, comparison, DIC, dissolved inorganic carbon, radiocarbon, SEAWATER},
	issn = {0033-8222, 1945-5755},
	doi = {10.1017/RDC.2023.16},
	url = {https://www.cambridge.org/core/journals/radiocarbon/article/comparability-of-radiocarbon-measurements-in-dissolved-inorganic-carbon-of-seawater-produced-at-ethzurich/B9F6C6AA45835FA3ED0BF8E0CD9788E3},
	author = {Castrillejo, Maxi and Hansman, Roberta L. and Graven, Heather D. and Lester, Joanna G. and Bollhalder, Silvia and K{\"u}ndig, Kayley and Wacker, Lukas}
}
@article {932,
	title = {Geomorphologic controls on the age of particulate organic carbon from small mountainous and upland rivers},
	journal = {Global Biogeochemical Cycles},
	volume = {20},
	year = {2006},
	note = {082xbTimes Cited:78Cited References Count:77},
	month = {Sep 9},
	pages = {1-11},
	abstract = {To assess the role that erosion processes play in governing the character of particulate organic carbon (POC) discharged from small mountainous and upland rivers, a suite of watersheds from Oregon, California, and New Zealand was investigated. The rivers share similar geology, tectonic setting, and climate, but have sediment yields that range over 3 orders of magnitude. The (14)C age of the POC loads is highly correlated with sediment yield. Carbon isotope mass balances reveal that the rivers carry bimodal mixtures of modern-plant-and ancient-rock-derived OC. At lower yields, modern plant OC dominates the material delivered to the river by sheetwash and shallow landsliding. With increasing yield, a progressively larger part of the POC is contributed directly from bedrock erosion via deep gully incision. Our results support the inference that active margin watersheds are important sources of aged POC to the ocean.},
	keywords = {14C, kerogen recycling, particulate organic carbon},
	issn = {0886-6236},
	doi = {10.1029/2005GB002677},
	author = {Leithold, E. L. and Blair, N. E. and Perkey, D. W.}
}
@article {1021,
	title = {Alabama Gulf Coast groundwaters: 4He and 14C as groundwater-dating tools},
	journal = {Geology},
	volume = {32},
	year = {2004},
	note = {id: 1222},
	pages = {289-292},
	abstract = {Analyses of 4He and 14C in groundwaters from a Miocene quartz aquifer on the Alabama Gulf Coast show the usefulness of 4He for dating these Holocene groundwaters. In this aquifer system of low alkalinities and low pHs, radiocarbon ages can be used without model correction. The groundwaters studied ranged from 42.3\% to 95.5\% modern carbon and yielded uncorrected ages of 375{\textendash}6790 yr. Radiogenic 4He ages ranged from >50{\textendash}7500 yr. },
	keywords = {14C, 4He, age dating, Baldwin County Alabama, groundwater},
	doi = {10.1130/G20081.2 },
	author = {Carey, Anne and Dowling, Carolyn B. and Poreda, Robert J.}
}
