@article {102,
	title = {Resolving varve and radiocarbon chronology differences during the last 2000 years in the Santa Barbara Basin sedimentary record, California},
	journal = {Quaternary International},
	volume = {310},
	year = {2013},
	note = {id: 2289},
	pages = {155-168},
	abstract = {Santa Barbara Basin (SBB) is well known for producing high quality paleoclimate reconstructions, but the validity of correlations between the basin and other regions rests upon age model accuracy. Yet, the two independent and well-established chronologies based on varve counting and radiocarbon dating do not consistently agree during the last two millennia. Here the validity of age model assumptions is tested including whether 1) the regional reservoir age of surface waters was invariably 641 {\textpm} 119 years through time, and/or 2) SBB laminae couplets are consistently annual varves and counted with sufficient precision. This high-resolution 14C study of SBB sediments compares 49 mixed planktonic foraminiferal carbonate and 20 terrestrial organic carbon 14C dates to the varve chronology, to extend the high-resolution paleoclimate chronology of the basin back \~{}2000 years. Evidence indicates that regional reservoir ages do not remain constant through time with ΔR, (i.e. regional reservoir age minus variations in the global mixed-layer ocean reservoir age) fluctuating between 80 and 350 years. Second, there is a consistent (R2 = 0.96) undercounting of the varves between 150 and \~{}1700 AD based on a new varying ΔR 14C chronology, indicating that some laminae couplets may not be annual. Loss of varves may occur when low riverine input and infrequent winter storm activity during drought intervals fail to supply a siliciclastic layer.},
	issn = {1040-6182},
	doi = {10.1016/j.quaint.2012.09.006},
	url = {http://www.sciencedirect.com/science/article/pii/S1040618212031734},
	author = {Hendy, Ingrid L. and Dunn, L. and Schimmelmann, A. and Pak, D. K.}
}
@article {830,
	title = {Compound-specific D/H ratios of lipid biomarkers from sediments as a proxy for environmental and climatic conditions},
	journal = {Geochimica Et Cosmochimica Acta},
	volume = {65},
	year = {2001},
	note = {395npTimes Cited:209Cited References Count:64},
	month = {Jan},
	pages = {213-222},
	abstract = {Hydrogen isotope ratios (D/H) of lipid biomarkers extracted from aquatic sediments were measured to determine whether they can be used as a proxy for D/H of environmental water. Values of deltaD were determined by using a recently developed isotope-ratio-monitoring gas chromatograph-mass spectrometer system (irmGCMS) and were confirmed by conventional hydrogen isotopic measurements (i.e., combustion followed by reduction) on individual compounds isolated by preparative capillary gas chromatography. Diverse lipids (alkanes, n-alkanols, sterols, and pentacyclic triterpenols) were analyzed to examine hydrogen-isotopic controls on lipids of varying origin and biosynthetic pathway. For algal sterols (24-methylcholest-3 beta -ol, 24-ethylcholest-5,22-dien-3 beta -ol, and 4,23,24-trimethylcholesterol, or dinosterol), the fractionation between sedimentary lipids and environmental water was -201 +/- 10 parts per thousand and was similar in both marine and freshwater sites. In a sediment from a small lake in a forested catchment, triterpenols from terrestrial sources were enriched in D by 30 parts per thousand relative to algal sterols. Apparent fractionation factors for n-alkyl lipids were smaller than those of triterpenols and were more variable, probably reflecting multiple sources for these compounds. We conclude that hydrogen-isotopic analyses of algal sterols provide a viable means of reconstructing D/H of environmental waters. Results are less ambiguous than reconstructions based on analyses of kerogen or other operationally defined organic matter fractions. Copyright (C) 2001 Elsevier Science Ltd.},
	issn = {0016-7037},
	doi = {10.1016/S0016-7037(00)00520-2},
	author = {Sauer, P. E. and Eglinton, T. I. and Hayes, J. M. and Schimmelmann, A. and Sessions, A. L.}
}
@conference {1807,
	title = {The tie-in of a varve-count chronology and radiocarbon dates: a method for addressing 14C-reservoir age},
	booktitle = {Climate Conference, LDGO},
	year = {2000},
	note = {id: 199},
	month = {2000},
	address = {Columbia University, New York},
	author = {Schimmelmann, A. and Lange, Carina B.}
}
@article {811,
	title = {Fractionation of hydrogen isotopes in lipid biosynthesis},
	journal = {Organic Geochemistry},
	volume = {30},
	year = {1999},
	note = {254efTimes Cited:281Cited References Count:26},
	pages = {1193-1200},
	abstract = {Isotopic compositions of carbon-bound hydrogen in individual compounds from eight different organisms were measured using isotope-ratio-monitoring gas chromatography-mass spectrometry. This technique is capable of measuring D/H ratios at natural abundance in individual lipids yielding as little as 20 nmol of H-2, and is applicable to a wide range of compounds including hydrocarbons, sterols, and fatty acids. The hydrogen isotopic compositions of lipids are controlled by three factors: isotopic compositions of biosynthetic precursors, fractionation and exchange accompanying biosynthesis, and hydrogenation during biosynthesis. delta D values of lipids from the eight organisms examined here suggest that all three processes are important for controlling natural variations in isotopic abundance. n-Alkyl lipids are depleted in D relative to growth water by 113-262 parts per thousand, while polyisoprenoid lipids are depleted in D relative to growth water by 142-376 parts per thousand. Isotopic variations within compound classes (e.g., n-alkanes) are usually less than similar to 50 parts per thousand, but variations as large as 150 parts per thousand are observed among isoprenoid lipids from a single organism. Phytol is consistently depleted in D by up to 50 parts per thousand relative to other isoprenoid lipids. Inferred isotopic fractionations between cellular water and lipids are greater than those indicated by previous studies. (C) 1999 Elsevier Science Ltd. All rights reserved.},
	issn = {0146-6380},
	doi = {10.1016/S0146-6380(99)00094-7},
	author = {Sessions, A. L. and Burgoyne, T. W. and Schimmelmann, A. and Hayes, J. M.}
}
