@article {2797,
	title = {Analysis of multiple cosmogenic nuclides constrains Laurentide Ice Sheet history and process on Mt. Mansfield, Vermont{\textquoteright}s highest peak},
	journal = {Quaternary Science Reviews},
	volume = {205},
	year = {2019},
	month = {Jan-02-2019},
	pages = {234 - 246},
	abstract = {Constraining glacial history and process on Mt Mansfield, the highest peak in Vermont (1339 m a.s.l.), provides insight into how the Laurentide Ice Sheet shaped the underlying landscape, when latest Pleistocene ice retreated, and how upland and lowland glacial histories relate. Here, we quantify in situ cosmogenic 10Be in 20 bedrock and boulder surfaces, as well as in situ cosmogenic 14C in three of those surfaces, to assess subglacial erosion and exposure history. Isotopic concentrations indicate that Mt. Mansfield{\textquoteright}s lower elevations (\~{}400{\textendash}1200 m a.s.l.) were deeply eroded by at least several meters during the last glaciation and then deglaciated rapidly; 10Be ages across this elevation span are indistinguishable and average 13.9 {\textpm} 0.6 ka (n = 15), suggesting that 800 m of ice thinning occurred within at most about a millennium. Conversely, the higher elevations (>1200 m a.s.l.) preserve a more complex geomorphic history. Mt. Mansfield{\textquoteright}s summit surfaces contain 10Be from previous periods of exposure, indicating that the mountaintop landscapes were likely preserved beneath cold-based, weakly-erosive glacial ice. Exposure ages from the shorter-lived isotope, 14C, are younger (9.7 and 11.7 ka), suggesting that Mt. Mansfield{\textquoteright}s summit was covered until the early Holocene, perhaps by snowfields, ice carapaces, and/or till. Our findings, in context of previous work, suggest that thinning Laurentide ice flowed through the valleys for at most hundreds of years following deglaciation of the uplands, but that the summit remained shielded by ice or sediment for millennia after the valleys became ice-free.},
	keywords = {Cosmogenic isotopes, erosion, Geochronology, Glaciation, Last glacial maximum, North America, Pleistocene},
	issn = {02773791},
	doi = {10.1016/j.quascirev.2018.12.014},
	url = {https://linkinghub.elsevier.com/retrieve/pii/S0277379118307145},
	author = {Corbett, Lee B. and Bierman, Paul R. and Wright, Stephen F. and Shakun, Jeremy D. and Davis, P. Thompson and Goehring, Brent M. and Halsted, Christopher T. and Koester, Alexandria J. and Caffee, Marc W. and Zimmerman, Susan R.}
}
@article {2854,
	title = {Sea Level Rise Explains Changing Carbon Accumulation Rates in a Salt Marsh Over the Past Two Millennia},
	journal = {Journal of Geophysical Research: Biogeosciences},
	volume = {124},
	year = {2019},
	month = {Sep-10-2019},
	pages = {2945 - 2957},
	abstract = {High rates of carbon burial observed in wetland sediments have garnered attention as a potential {\textquotedblleft}natural fix{\textquotedblright} to reduce the concentration of carbon dioxide (CO2) in Earth{\textquoteright}s atmosphere. A carbon accumulation rate (CAR) can be determined through various methods that integrate a carbon stock over different time periods, ranging from decades to millennia. Our goal was to assess how CAR changed over the lifespan of a salt marsh. We applied a geochronology to a series of salt marsh cores using both 14C and 210Pb markers to calculate CARs that were integrated between 35 and 2,460 years before present. CAR was 39 g C{\textperiodcentered}m-2{\textperiodcentered}year-1 when integrated over millennia but was upward of 148 g C{\textperiodcentered}m-2{\textperiodcentered}year-1 for the past century. We present additional evidence to account for this variability by linking it to changes in relative sea level rise (RSLR), where higher rates of RSLR were associated with higher CARs. Thus, the CAR calculated for a wetland should integrate timescales that capture the influence of contemporary RSLR. Therefore, caution should be exercised not to utilize a CAR calculated over inappropriately short or long timescales as a current assessment or forecasting tool for the climate change mitigation potential of a wetland.},
	keywords = {Carbon storage, Geochronology, Salt marsh, sea-level rise},
	issn = {2169-8953},
	doi = {10.1029/2019JG005207},
	url = {https://onlinelibrary.wiley.com/doi/abs/10.1029/2019JG005207},
	author = {McTigue, Nathan and Davis, Jenny and Rodriguez, Antonio B. and McKee, Brent and Atencio, Anna and Currin, Carolyn}
}
@article {2636,
	title = {Using Stable Carbon Isotopes to Quantify Radiocarbon Reservoir Age Offsets in the Coastal Black SeaAbstract},
	journal = {Radiocarbon},
	volume = {61},
	year = {2019},
	month = {Jan-02-2019},
	pages = {309 - 318},
	abstract = {Constraining radiocarbon (C-14) reservoir age offsets is critical to deriving accurate calendar-age chronologies from C-14 dating of materials which did not draw carbon directly from the atmosphere. The application of C-14 dating to such materials is severely limited in hydrologically sensitive environments like the Black Sea because of the difficulty to quantify reservoir age offsets, which can vary quickly and significantly through time, due to the dynamics of the biogeochemical cycling of carbon. Here we reconstruct C-14 reservoir age offsets (Rshell-atm) of Holocene bivalve shells from the coastal Black Sea relatively to their contemporaneous atmosphere. We show that the C-14 reservoir age offset and the stable carbon isotope composition of bivalve shells are linearly correlated in this region. From a biogeochemical standpoint, this suggests that inorganic stable carbon isotope and C-14 compositions of Black Sea coastal waters are controlled by the balance between autochthonous primary productivity and heterotrophic respiration of allochthonous pre-aged terrestrial organic matter supplied by rivers. This provided an important implication for Black Sea geochronology as the reservoir age offset of C-14-dated bivalve shell can be inferred from its stable carbon isotope composition. Our results provide a fundamental and inexpensive geochemical tool which will considerably improve the accuracy of Holocene calendar age chronologies in the Black Sea.},
	keywords = {Black Sea, Carbon cycle, freshwater reservoir effect, Geochronology, Reservoir age},
	issn = {0033-8222},
	doi = {10.1017/RDC.2018.61},
	url = {https://www.cambridge.org/core/product/identifier/S0033822218000619/type/journal_articlehttps://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822218000619},
	author = {Soulet, Guillaume and Giosan, Liviu and Flaux, Cl{\'e}ment and Galy, Valier}
}
@conference {1692,
	title = {Microscale AMS (super <sup>14</sup>) C measurement at NOSAMS},
	volume = {40},
	year = {1998},
	note = {id: 2237; Source type: conferencepapers\&proceedings; Object type: Article; Object type: Conference Paper; Copyright: GeoRef, Copyright 2007, American Geological Institute.; CSAUnique: 1999-044438; AccNum: 1999-044438; ISSN: 0033-8222; CODEN: RACAAT},
	month = {1998},
	pages = {61-75},
	publisher = {University of Arizona, Department of Geosciences, Tucson, AZ, United States (USA)},
	organization = {University of Arizona, Department of Geosciences, Tucson, AZ, United States (USA)},
	address = {United States (USA)},
	abstract = {Techniques for making precise and accurate radiocarbon accelerator mass spectrometry (AMS) measurements on samples containing less than a few hundred micrograms of carbon are being developed at the NOSAMS facility. A detailed examination of all aspects of the sample preparation and data analysis process shows encouraging results. Small quantities of CO (sub 2) are reduced to graphite over cobalt catalyst at an optimal temperature of 605 degrees C. Measured (super 14) C/ (super 12) C ratios of the resulting targets are affected by machine-induced isotopic fractionation, which appears directly related to the decrease in ion current generated by the smaller sample sizes. It is possible to compensate effectively for this fractionation by measuring samples relative to small standards of identical size. Examination of the various potential sources of background (super 14) C contamination indicates that the sample combustion process is the largest contributor, adding ca. 1 mu g of carbon with a less-than-modern (super 14) C concentration.},
	keywords = {03, absolute age, accelerator mass spectroscopy, accuracy, C-14, C-14/C-12, carbon, Carbon dioxide, combustion, data processing, Geochronology, graphite, isotope fractionation, isotopes, mass spectroscopy, mathematical methods, methods, native elements, radioactive isotopes, sample preparation, size, spectroscopy, Stable isotopes},
	doi = {10.1017/S0033822200017902},
	url = {http://hdl.handle.net/10150/653650},
	author = {Pearson, Ann and McNichol, Ann P. and Schneider, Robert J. and von Reden, Karl F. and Zheng, Yan}
}
@conference {1800,
	title = {(super 14) C AMS measurements of},
	volume = {40},
	year = {1998},
	note = {id: 2239; Source type: conferencepapers\&proceedings; Object type: Article; Object type: Conference Paper; Copyright: GeoRef, Copyright 2007, American Geological Institute.; CSAUnique: 1999-044459; AccNum: 1999-044459; ISSN: 0033-8222; CODEN: RACAAT},
	month = {1998},
	pages = {247-253},
	publisher = {University of Arizona, Department of Geosciences, Tucson, AZ, United States (USA)},
	organization = {University of Arizona, Department of Geosciences, Tucson, AZ, United States (USA)},
	address = {United States (USA)},
	abstract = {The NOSAMS facility at Woods Hole Oceanographic Institution has started to develop and apply techniques for measuring very small samples on a standard Tandetron accelerator mass spectrometry (AMS) system with high-current hemispherical Cs sputter ion sources. Over the past year, results on samples ranging from 7 to 160 mu g C showed both the feasibility of such analyses and the present limitations on reducing the size of solid carbon samples. One of the main factors affecting the AMS results is the dependence of a number of the beam optics parameters on the extracted ion beam current. The extracted currents range from 0.5 to 10 mu A of (super 12) C (super -) for the sample sizes given above. We here discuss the setup of the AMS system and methods for reliable small-sample measurements and give the AMS-related limits to sample size and the measurement uncertainties.},
	keywords = {03, absolute age, accelerator mass spectroscopy, C-14, carbon, dilution, Geochronology, ions, isotopes, mass spectroscopy, precision, radioactive isotopes, sample preparation, spectroscopy, volume},
	author = {von Reden, Karl F. and McNichol, Ann P. and Pearson, Ann and Schneider, Robert J.}
}
