Publications by KCCAMS researchers

Alexandre A., Basile-Doelsch I., Delhaye T., Borshneck D., Mazur J.C., Reyerson P., and Santos G.M. 2015. Biogeosciences, 12, 863-873, 2015, New highlights of phytolith structure and occluded carbon location: 3-X-ray microscopy and NanoSIMS results. Biogeosciences, 12, 863-873, 2015, doi: 10.5194/bg-12-863-2015
Andreu-Hayles L, Santos GM, Herrera-Ramírez DA, Martin-Fernández J, Boza-Espinoza TE, Fuentes-Claros AF, Jørgensen PM, 2015 Annual tree rings in Pseudolmedia Rigida from Bolivia confirmed by matching dendrochronological dates with the Southern Hemisphere 14C Curves, Radiocarbon 57(1), DOI: 10.2458/azu_rc.57.18192
Santos GM, Linares R, Lisi CS and Tomazello Filho M 2015 Annual growth rings in a sample of Paraná pine (Araucaria angustifolia): Toward improving the 14C calibration curve for the Southern Hemisphere, Quaternary Geochronology 25:96-103, doi: 10.1016/j.quageo.2014.10.004.
Fernandez A, Santos G, Williams E, Pendergraft  M, Vetter  L, Rosenheim B, 2014 Blank corrections for ramped pyrolysis radiocarbon dating of sedimentary and soil organic carbon; Analytical Chemistry, doi: 10.1021/ac502874j, in press, doi: 10.2458/azu_rc.57.18192.
Gao P.,  Xu X.,  Zhou L., Pack M., Griffin S., Santos G., Southon J., and Liu  K. 2014 Rapid sample preparation of dissolved inorganic carbon in natural waters using a headspace-extraction approach for radiocarbon analysis by accelerator mass spectrometry, Limnology and Oceanography: Methods, 12:174-190, doi:10.4319/lom.2014.12.174.
Coe HHG, Macario K, Gomes JG, Chuenga KF, Oliveira F, Gomes PRS, Carvalho C, Linares R., Alvesb E, and Santos GM 2014 Understanding the variations in the vegetation of Sao Joao River basin, Southeastern coast of Brazil, during the Quaternary, using phytoliths and isotopic analyses, Palaeogeography, Palaeoclimatology, Palaeoecology,  doi: 10.1016/j.palaeo.2014.01.009.
Martinez De La Torre HA, Ormsby KM, Fuller BT, and Santos GM. 2014 14C Measurements Elucidate Isotopic Differences between Nails and Hair in Modern Humans, Radiocarbon 56(1): 53–65, doi:10.2458/56.17503


Affek H.P., Xu X. and Eiler J.M. (2007) Seasonal and diurnal variations of 13C18O16O in air: Initial observations from Pasadena , CA. Geochim. Cosmochim. Acta (71) 5033-5043.

Beaumont, W., R. Beverly, J. R. Southon, R. E. Taylor (2010) Bone preparation at the KCCAMS Laboratory. Nuclear Instruments and Methods in Physics Research. B268:906-909.

Beaupre, Steven R., Ellen R. M. Druffel and Sheila Griffin (2007) A low-blank photochemical extraction system for concentration and isotopic analyses of marine dissolved organic carbon, Limnology and Oceanography: Methods 5, 174-184.

Beaupré, S. and Aluwihare, L., 2009. Constraining the 2-component model of marine dissolved organic radiocarbon. Deep Sea Research, in revision.

Beaupré, S. and Druffel, E., 2009. Constraining the propagation of bomb-radiocarbon through the dissolved organic carbon (DOC) pool in the northeast Pacific Ocean . Deep-Sea Research, 56(10), 1717-1726 .

Beverly RK, Beaumont W, Tauz D, Ormsby KM, von Reden KF, Santos GM and Southon JR (2010) The Keck Carbon Cycle AMS Laboratory, University of California Irvine: Status report, Radiocarbon 52(2): 301-309. Click here for PDF file.

Borken, W., K. Savage, E. A. Davidson, and S. E. Trumbore (2006), Effects of experimental drought on soil respiration and radiocarbon efflux from a temperate forest soil, Global Change Biol., 12, 177-193.

Brando P.M., D.C. Nepstad, E. A. Davidson, S. E. Trumbore, D. Ray and P. Camargo. (2008) Drought effects on litterfall, wood production and belowground carbon cycling in an Amazon forest: results of a throughfall reduction experiment, Phil. Trans. Royal Society B, 363 (1498): 1839-1848.

Carbone, M. S., C. I. Czimczik, K. E. McDuffee, and S. E. Trumbore (2007), Allocation and residence time of photosynthetic products in a boreal forest using a low-level C-14 pulse-chase labeling technique, Global Change Biol., 13, 466-477. Click here for PDF file.

Carbone, M. S., G. C. Winston, and S. E. Trumbore (2008), Soil respiration in perennial grass and shrub ecosystems: Linking environmental controls with plant and microbial sources on seasonal and diel timescales, J. Geophys. Res., 113, G02022, doi:10.1029/2007JG000611.

Castanha C., S. Trumbore and R. Amundson (2008) Methods of separating soil carbon pools affect the chemistry and turnover time of isolated fractions. Radiocarbon 50: 83-97.

Cisneros-Dozal, L. M., S. Trumbore, and P. J. Hanson (2006), Partitioning sources of soil-respired CO2 and their seasonal variation using a unique radiocarbon tracer, Global Change Biol., 12, 194-204.

Cisneros-Dozal, L. M., S. E. Trumbore, and P. J. Hanson (2007), Effect of moisture on leaf litter decomposition and its contribution to soil respiration in a temperate forest, Journal of Geophysical Research-Biogeosciences, 112, G01013.

Culleton, B. J., D. J. Kennett, B. L. Ingram, J. M. Erlandson, and J. R. Southon (2006), Intrashell radiocarbon variability in marine mollusks, Radiocarbon, 48, 387-400.

Czimczik, C. I., K. K. Treseder, M. S. Carbone, and S. E. Trumbore (2005), Radiocarbon - a low-impact tool to study nutrient transport by soil fungi under field conditions, New Phytol., 166, 595-600. Click here for PDF file.

Czimczik, C. I., S. E. Trumbore, M. S. Carbone, and G. C. Winston (2006), Changing sources of soil respiration with time since fire in a boreal forest, Global Change Biol., 12, 957-971. Click here for PDF file.

Davidson, E. A., K. E. Savage, S. E. Trumbore, and W. Borken (2006), Vertical partitioning of CO2 production within a temperate forest soil, Global Change Biol., 12, 944-956.

De Pol-Holz , R., Keigwin, L., Southon, J., Hebbeln, D. and Mohtadi M. 2010 Young intermediate waters off the coast of Chile during the last deglaciation. Nature geoscience 3, 192-195

Drenzek, N.J., K. A. Hughen, D. B. Montluçon, J. R. Southon, G. M. dos Santos, E. R. M. Druffel, L. Giosan, and T. I. Eglinton (2009), A new look at old carbon in active margin sediments, Geology, 37, 239-242.

Druffel, E.R.M., James E. Bauer, Sheila Griffin, and Jeomshik Hwang (2003), Penetration of Anthropogenic Carbon into Organic Particles of the Deep Ocean, Geophysical Research Letters, 30, 14, 1744,

Druffel, E. R. M. (2004), Comments on the importance of black carbon in the global carbon cycle, Mar. Chem., 92, 197-200.

Druffel, E. R. M., S. Griffin, J. Hwang, T. Komada, S. R. Beaupre, K. C. Druffel-Rodriguez, G. M. Santos, and J. Southon (2004), Variability of monthly radiocarbon during the 1760s in corals from the Galapagos Islands, Radiocarbon, 46, 627-631.

Druffel, E. R. M., J. E. Bauer, and S. Griffin (2005), Input of particulate organic and dissolved inorganic carbon from the Amazon to the Atlantic Ocean, Geochemistry Geophysics Geosystems, 6, Q03009.

Druffel, E. R. M., S. Griffin, S. R. Beaupre, and R. B. Dunbar (2007), Oceanic climate and circulation changes during the past four centuries from radiocarbon in corals, Geophys. Res. Lett., 34, L09601.

Druffel, E.R.M., LF. Robinson, S. Griffin , R. Halley, J. Southon and J.F. Adkins (2008). Low reservoir ages for the surface ocean from mid-Holocene Florida corals, Paleoceanography, 23, 7pp. doi:10.1029/2007PA001527.

Druffel, E., Bauer, J., Griffin , S., Beaupré, S. and Hwang, J., 2008. Dissolved inorganic radiocarbon in the North Pacific Ocean and Sargasso Sea . Deep-Sea Research, 55(4): 451-459.

Druffel, E. and Griffin , S., 2008. Daily variability of dissolved inorganic radiocarbon at three sites in the surface ocean. Marine Chemistry, 110: 185-189.

Druffel E, Zhang D, Xu X, Ziolkowski LA, Southon JR, Santos GM and Trumbore SE (2010) Compound specific radiocarbon analyses of phospholipid fatty acids, alkanes and black carbon in oceanic sediments, Radiocarbon 52(3): 1215-1223. Click here for PDF file.

Eltgroth, S. F., J. F. Adkins, L. F. Robinson, J. Southon, and M. Kashgarian (2006), A deep-sea coral record of North Atlantic radiocarbon through the Younger Dryas: Evidence for intermediate water, Paleoceanography, 21, PA4207.

Erlandson, J. M., M. E. Macko, H. C. Koerper, and J. Southon (2005), The antiquity of Olivella shell beads at CA-ORA-64: AMS radiocarbon dated between 9420 and 7780 cal BP, Journal of Archaeological Science, 32, 393-398.

Fierer, N., O. A. Chadwick, and S. E. Trumbore (2005), Production of CO 2 in soil profiles of a California annual grassland, Ecosystems, 8, 412-429.

Gaudinski, J. B., T. E. Dawson, S. Quideau, E. A. G. Schuur, J. S. Roden, S. E. Trumbore, D. R. Sandquist, S. W. Oh, and R. E. Wasylishen (2005), Comparative analysis of cellulose preparation techniques for use with C-13, C-14, and O-18 isotopic measurements, Anal. Chem., 77, 7212-7224.

Gaudinski, J. B., M. S. Torn, W. J. Riley, C. Swanston, S. E. Trumbore, J. D. Joslin, H. Majdi, T. E. Dawson and P. J. Hanson (2009) Use of stored carbon reserves in growth of temperate tree roots and leaf buds: analyses using radiocarbon measurements and modeling. Global Change Biology 15: 992-1014.

George, D., J. Southon, and R. E. Taylor (2005), Resolving an anomolous radiocarbon determination on mastodon bone from Monte Verde, Chile, American Antiquity, 70, 766-772.

Godoy, M.L.D.P., J.M. Godoy, R. Kowsmann, G.M. dos Santos and R.P. da Cruz (2006) 234U and 230Th Determination by FI-ICP-MS and application to Uranium-series disequilibrium in marine samples, Journal of Environmental Radioactivity 88(2): 109-117.

Gorbarenko, S. A., I. A. Basov, M. P. Chekhovskaya, J. Southon, T. A. Khusid, and A. Artemova (2005), Orbital and millennium scale environmental changes in the southern Bering Sea during the last glacial-Holocene: Geochemical and paleontological evidence, Deep-Sea Research Part Ii-Topical Studies in Oceanography, 52, 2174-2185.

Gorbarenko, S. A., J. R. Southon, L. D. Keigwin, M. V. Cherepanova, and I. G. Gvozdeva (2004), Late Pleistocene-Holocene oceanographic variability in the Okhotsk Sea: geochemical, lithological and paleontological evidence, Palaeogeography Palaeoclimatology Palaeoecology, 209, 281-301.

Grottoli, A. G., S. T. Gille, E. R. M. Druffel, and R. B. Dunbar (2003), Decadal timescale shift in the C-14 record of a central equatorial Pacific coral, Radiocarbon, 45, 91-99.

Guilderson, T. P., J. E. Cole, and J. R. Southon (2005), Pre-bomb Delta C-14 variability and the suess effect in Cariaco Basin surface waters as recorded in hermatypic corals, Radiocarbon, 47, 57-65.

Hansman, R. S. Griffin, J. Watson, E. Druffel, A. Ingalls, A. Pearson, and A. Aluwihare, (2009). The radiocarbon signature of microorganisms in the mesopelagic ocean, Proceedings of the National Academy of Science 106, 6513–6518.

Hinger, E.N., Guaciara M. Santos, Ellen R.M. Druffel, and Sheila Griffin (2010) Carbon Isotope Measurements of Surface Seawater from a Time-Series Site off Southern California, Radiocarbon 52(1):69-89. Click here for PDF file.

Hsueh, D. Y., N. Y. Krakauer, J. T. Randerson, X. M. Xu, S. E. Trumbore, and J. R. Southon (2007), Regional patterns of radiocarbon and fossil fuel-derived CO2 in surface air across North America, Geophys. Res. Lett., 34, L02816.

Hughen, K., S. Lehman, J. Southon, J. Overpeck, O. Marchal, C. Herring, and J. Turnbull (2004), C-14 activity and global carbon cycle changes over the past 50,000 years, Science, 303, 202-207.

Hughen, K. A. et al. (2004), Marine04 marine radiocarbon age calibration, 0-26 cal kyr BP, Radiocarbon, 46, 1059-1086.

Hughen, K. A., J. R. Southon, C. J. H. Bertrand, B. Frantz, and P. Zermeno (2004), Cariaco basin calibration update: Revisions to calendar and C-14 chronologies for core PL07-58PC, Radiocarbon, 46, 1161-1187.

Hughen, K., J. Southon, S. Lehman, C. Bertrand, and J. Turnbull (2006), Marine-derived C-14 calibration and activity record for the past 50,000 years updated from the Cariaco Basin, Quaternary Science Reviews, 25, 3216-3227.

Hwang, J., E. R. M. Druffel, S. Griffin, K. L. Smith, R. J. Baldwin, and J. E. Bauer (2004), Temporal variability of Delta C-14, delta C-13, and C, Global Biogeochem. Cycles, 18, GB4015. Click here for PDF file.

Hwang, J. and E. R. M. Druffel (2005), Blank correction for Delta C-14 measurements in organic compound classes of oceanic particulate matter, Radiocarbon, 47, 75-87. Click here for PDF file.

Hwang, J., E. R. M. Druffel, and T. Komada (2005), Transport of organic carbon from the California coast to the slope region: A study of Delta C-14 and delta C-13 signatures of organic compound classes, Global Biogeochem. Cycles, 19, GB2018. Click here for PDF file.

Hwang, J. S., E. R. M. Druffel, and J. E. Bauer (2006), Incorporation of aged dissolved organic carbon (DOC) by oceanic particulate organic carbon (POC): An experimental approach using natural carbon isotopes, Mar. Chem., 98, 315-322. Click here for PDF file.

Hwang, J. and E. R. M. Druffel (2006), Carbon isotope ratios of organic compound fractions in oceanic suspended particles, Geophys. Res. Lett., 33, L23610. Click here for PDF file.

Hwang, J., E. R. M. Druffel, T. I. Eglinton, and D. J. Repeta (2006), Source(s) and cycling of the nonhydrolyzable organic fraction of oceanic particles, Geochim. Cosmochim. Acta, 70, 5162-5168. Click here for PDF file.

Ingalls, A. E., S. R. Shah, R. L. Hansman, L. I. Aluwihare, G. M. Santos, E. R. M. Druffel, and A. Pearson (2006), Quantifying archaeal community autotrophy in the mesopelagic ocean using natural radiocarbon, Proc. Natl. Acad. Sci. U. S. A., 103, 6442-6447.

Ingalls AE, Ellis E, Santos GM, McDuffee K, Truxal L, Keil RG, Druffel ERM (2010) HPLC Purification of Higher Plant-Derived Lignin Phenols for Radiocarbon Dating, Analytical Chemistry, in press.

Kennett, D., A. Anderson, M. Prebble, E. Conte, and J. Southon (2006), Prehistoric human impacts on Rapa, French Polynesia, Antiquity, 80, 340-354.

Kessler, J. D., W. S. Reeburgh, J. Southon, R. Seifert, W. Michaelis, and S. C. Tyler (2006), Basin-wide estimates of the input of methane from seeps and clathrates to the Black Sea, Earth Planet. Sci. Lett., 243, 366-375.

Kessler, J. D., W. S. Reeburgh, J. Southon, and R. Varela (2005), Fossil methane source dominates Cariaco Basin water column methane geochemistry, Geophys. Res. Lett., 32, L12609.

Khosh M.S., Xu X. and Trumbore S.E. (2009) Small-mass Graphite Preparation by Sealed Tube Zinc Reduction Method for AMS 14C Measurements. Nucl. Instr. and Meth. in Phys. Res. (in press).

Komada, T., E. R. M. Druffel, and S. E. Trumbore (2003), Sources, composition, and fate of suspended particulate organic carbon of a small mountainous river., Abstracts of Papers of the American Chemical Society, 225, U930-U930.

Komada, T., E. R. M. Druffel, and S. E. Trumbore (2004), Oceanic export of relict carbon by small mountainous rivers, Geophys. Res. Lett., 31, L07504.

Komada, T., E. R. M. Druffel, and J. Hwang (2005), Sedimentary rocks as sources of ancient organic carbon to the ocean: An investigation through Delta C-14 and delta C-13 signatures of organic compound classes, Global Biogeochem. Cycles, 19, GB2017. Click here for PDF file.

Kramer C, Trumbore S, Fröberg M, Dozal LMC, Zhang D, Xu X, Santos GM and Hanson P, Recent (<4 year old) Leaf Litter is Not a Major Source of Microbial Carbon in a Temperate Forest Mineral Soil, Soil Biology & Biochemistry, 42:1028-1037.  DOI 10.1016/j.soilbio.2010.02.021

Kueppers, L. M., J. Southon, P. Baer, and J. Harte (2004), Dead wood biomass and turnover time, measured by radiocarbon, along a subalpine elevation gradient, Oecologia, 141, 641-651.

Laguens, A.G., M. Fabra, G.M. Santos and D.A. Demarchi (2009) Palaeodietary Inferences Based on Isotopic Data for Pre-Hispanic Populations of the Central Mountains of Argentina, International Journal of Osteoarchaeology 19: 237–249.

Li H.-C., Xu X., Ku T.-L., You C.-F., Buchheim H.P. and Peters R. (2008) Isotopic and geochemical evidence of paleoclimate changes in Salton Basin , California during the past 20 Kyrs: 1. δ18O and δ13C records in Lake Tufa deposits. Paleogeography, Palaeoclimatology, Palaeoecology. 259(2-3), 182-197.

Li H.-C., You C.-F., Ku T.-L., Xu X., Buchheim H.P., Wan N.-J., Wang R.-M. and Shen M.-L. (2008) Isotopic and geochemical evidence of paleoclimate changes in Salton Basin , California during the past 20 Kyrs: 2. 87Sr/86Sr ratio in Lake Tufa deposits as a tracer of water sources. Paleogeography, Palaeoclimatology, Palaeoecology. 259(2-3), 198-212.

Lindahl, B. D., K. Ihrmark, J. Boberg, S. E. Trumbore, P. Hogberg, J. Stenlid, and R. D. Finlay (2007), Spatial separation of litter decomposition and mycorrhizal nitrogen uptake in a boreal forest, New Phytol., 173, 611-620.

Magana, A.L., J.R. Southon, J.P. Kennett, E.B. Roark, M. Sarnthein, and L.D. Stott. 2010. Resolving the cause of large differences between deglacial benthic foraminifera radiocarbon measurements in Santa Barbara Basin, Paleoceanography, Accepted.

Mangini, A., J.M. Godoy, M.L. Godoy, R. Kowsmann, G.M. Santos, M. Ruckelshausen, A. Schroeder-Ritzrau, L. Wacker (2010) Deep sea corals off Brazil verify a poorly ventilated Southern Pacific Ocean during H2, H1 and the Younger Dryas, Earth and Planetatary Science Letters 293: 269-276

Masiello, C. A. and E. R. M. Druffel (2003), Organic and black carbon C-13 and C-14 through the Santa Monica Basin sediment oxic-anoxic transition, Geophys. Res. Lett., 30, 1185.

Masiello, C. A., O. A. Chadwick, J. Southon, M. S. Torn, and J. W. Harden (2004), Weathering controls on mechanisms of carbon storage in grassland soils, Global Biogeochem. Cycles, 18, GB4023.

McDuffee, K. and E.R.M. Druffel , (2007). Daily variability of dissolved inorganic radiocarbon in Sargasso Sea surface water, Marine Chemistry 106, 513-518.

McKay, J. L., T. F. Pedersen, and J. Southon (2005), Intensification of the oxygen minimum zone in the northeast Pacific off Vancouver Island during the last deglaciation: Ventilation and, Paleoceanography, 20, PA4002.

Mohtadi, M., S. Steincke, D. W. Oppo, J-B. W. Stuut, R. De Pol-Holz, D. Hebblen, E. C. Hathorne, J. Groeneveld and A. Lückge. Glacial to Holocene swings of the Australian-Indonesian monsoon, Submitted to Nature geoscience.

Muscheler, R., B.Kromer, S. Bjorck , A. Svensson, M.Friedrich, K.F.Kaiser, J.Southon, (2008), Tree rings and ice cores reveal 14C calibration uncertainties during the Younger Dryas, Nature Geoscience 1: 263-267.

Nowinski , N.S. , S. E. Trumbore, E.A.G. Schuur, M. C. Mack, G. R. Shaver (2008). Nutrient addition prompts rapid destabilization of organic matter in an arctic tundra ecosystem, Ecosystems, 11(1), 16-25.

Nowinski, N.S, S.E. Trumbore, G. Jiminez and M. Fenn (2009) Alteration of belowground carbon dynamics by nitrogen addition in southern California mixed conifer forests. J. Geophys. Res. B 114

Osorio, D., D. Jackson, P. C. Ugalde, C. Latorre, R. De Pol-Holz and C. Santoro, A Late Pleistocene multi-task logistical camp at Hakenasa cave: Lithic analyses and its relevance for the early peopling of the high Andes, Submitted to Antiquity.

Reimer, P. J. et al. (2004), IntCal04 terrestrial radiocarbon age calibration, 0-26 cal kyr BP, Radiocarbon, 46, 1029-1058.

Reimer, P. J. et al. (2006), Comment on "Radiocarbon calibration curve spanning 0 to 50,000 years BP based on paired Th-230/U-234, Quaternary Science Reviews, 25, 855-862.

Roberts, M.L., J.R.Southon. A preliminary determination of the absolute 14C/ 12C ratio of OX-1, Radiocarbon 49 (2007) 441-446.

Robinson, L. F., J. F. Adkins, L. D. Keigwin, J. Southon, D. P. Fernandez, S. L. Wang, and D. S. Scheirer (2005), Radiocarbon variability in the western North Atlantic during the last deglaciation, Science, 310, 1469-1473.

Santos, G.M., J. R. Southon, K. C. Druffel-Rodriguez, S. Griffin, and M. Mazon (2004), Magnesium perchlorate as an alternative water trap in AMS graphite sample preparation: A report on sample preparation at KCCAMS at the University of California, Irvine, Radiocarbon, 46, 165-173. Click here for PDF file.

Santos, G.M., M. Fabra, A. Laguens, D. Demarchi, J.R. Southon, R.E. Taylor and D. George. 14C-AMS as a tool for archaeological investigation: Implications for Human Settlement in South America (2006) Invited paper for: "The peopling of the Americas " International Symposium, December 16 to 22, 2006 at the Capivara National Park, Piaui, Brazil. Click here for PDF file.

Santos, G.M., J. Southon, S. Griffin , S.R. Beaupre and E.R. Druffel (2007a) Ultra small-mass 14C-AMS sample preparation and analysis at the KCCAMS Faclitity, Nuclear Instruments and Methods in Physics Research B (259): 293-302.

Santos, G.M., M. Mazon, J. Southon, S. Rifai and R.B. Moore (2007b) Evaluation of iron and cobalt powder brands as suitable catalysts for 14C-AMS target preparation, Nuclear Instruments and Methods in Physics Research B (259): 308-315.

Santos, G.M., R.B. Moore, J.R. Southon, S. Griffin, E. Hinger and D. Zhang (2007c) AMS 14C sample preparation at the KCCAMS/UC Irvine Facility: status report and performance of small samples. Radiocarbon, 49(2), 255-269. Click here for PDF file.

Santos, G.M. (2009) Comment on Atmospheric carbon isotope signatures in phytolith occluded carbon, Carter, J.A., Quaternary International, this volume (Forum Comment), Perspectives on Phytolith Research: 6th International Meeting on Phytolith Research, Quaternary International 193 (1-2):30-31.

Santos, G.M., Anne Alexandre, Heloisa H.G. Coe, Paul E. Reyerson, John R. Southon, Cacilda N. De Carvalho (2010)The Phytolith C puzzle: a tale of background determinations and accuracy tests, Radiocarbon 52(1):113-128. Click here for PDF file.

Santos, G.M., John R. Southon, Nicholas J. Drenzek, Lori A. Ziolkowski, Ellen Druffel, Xaiomei Xu, Dachun Zhang, Susan Trumbore, Timothy I. Eglinton and Konrad A. Hughen (2010)Blank assessment for ultra-small samples: chemical extraction and separation vs. AMS, Radiocarbon 52(3): 1322-1335 . Click here for PDF file.

Schuur, E. A. G. and S. E. Trumbore (2006), Partitioning sources of soil respiration in boreal black spruce forest using radiocarbon, Global Change Biol., 12, 165-176.

Southon, J. (2004), A radiocarbon perspective on Greenland ice-core chronologies: Can we use ice cores for C-14 calibration?, Radiocarbon, 46, 1239-1259.

Southon, J. and G. M.Santos (2004) Life with MC-SNICS: Ion source development at the Keck AMS facility, submitted to the Proceedings of the Symposium of North Eastern Accelerator Personnel (SNEAP 2004), McMaster University, Hamilton, Canada.

Southon, J., G. Santos, K. Druffel-Rodriguez, E. Druffel, S. Trumbore, X. M. Xu, S. Griffin, S. Ali, and M. Mazon (2004), The Keck Carbon Cycle AMS laboratory, University of California, Irvine: Initial operation and a background surprise, Radiocarbon, 46, 41-49. Click here for PDF file.

Southon, J.R. and G.M. Santos (2004), Ion source development at KCCAMS, University of California, Irvine, Radiocarbon, 46, 33-39. Click here for PDF file.

Southon, J.R., G.M. Santos, E.R. Druffel, S. Griffin, S. Trumbore and X. Xu (2005) High throughput, high precision 14C AMS with small accelerator. International Symposium on Utilisation of Accelerators, Dubrovnik, Croatia, 05-09 June 2005. Sponsor: IAEA Manuscript submitted. Click here for PDF file.

Southon, J.R. and G.M. Santos (2007) Life with MC-SNICS Part II: recent ion source development at the Keck Carbon Cycle AMS Facility, Nuclear Instruments and Methods in Physics Research B (259): 88-93

Southon, J.R. (2007) Graphite reactor memory - where is it from and how to minimize it? Nuclear Instruments and Methods in Physics Research B 259: 288-292.

Southon, J.R., G.M. Santos and B. Han (2007) Cs feed tests and emittance measurements on a modified MC-SNICS Ion Source for radiocarbon AMS. Radiocarbon, 49(2), 301-305. Click here for PDF file.

Southon, J.R. and A.L. Magana. August 2010. A Comparison of Cellulose Extraction and ABA Pretreatment Methods for AMS 14C Dating of Ancient Wood. Radiocarbon, 52(3): 1371-1379.

Stott, L. , J. Southon, A. Timmermann, A. Koutavas. Radiocarbon age anomaly at intermediate water depth in the Pacific Ocean during the last deglaciation, Paleoceanography 24 (2009) PA2223.

Swanston, C. W., M. S. Torn, P. J. Hanson, J. R. Southon, C. T. Garten, E. M. Hanlon, and L. Ganio (2005), Initial characterization of processes of soil carbon stabilization using forest stand-level radiocarbon enrichment, Geoderma, 128, 52-62

Taylor, R. E. and J. Southon (2006), Problems in the calibration of the radiocarbon time scale: Archaeological implications, Abstracts of Papers of the American Chemical Society, 231.

Taylor, R.E. and J. Southon (2007) Use of natural diamonds to monitor 14C AMS instrument backgrounds , Nuclear Instruments and Methods in Physics Research Section B 259: 282.

Taylor, R.E., J.Southon, M. Des Lauriers (2007). Holocene Marine Reservoir Time Series ∆R values from Cedros Island , Baja California . Radiocarbon 49: 899-904.

Taylor R. E,, W. C. Beaumont, J. Southon, D. Stronach, D. Pickworth (2010) Alternative explanations for anomalous 14C ages on human skeleton associated with the 612 BCE destruction of Nineveh. Radiocarbon 52: 372-382.

Torn, M. S., P. M. Vitousek, and S. E. Trumbore (2005), The influence of nutrient availability on soil organic matter turnover estimated by incubations and radiocarbon modeling, Ecosystems, 8, 352-372.

Torn, M.S., C.W. Swanston, C. Castanha, S.E. Trumbore. Storage and turnover of natural organic matter in soil. (2009) In: IUPAC Series on Biophysico-chemical Processes in Environmental Systems; Volume 2-Biophysico-chemical processes involving natural nonliving organic matter in environmental systems. Series Editors: P. M. Huang and N. Senesi.

Treseder, K. K., C. Czimczik, S. Trumbore and S. Allison (2008) Uptake of an amino acid by ectomycorrhizal fungi in a boreal forest. Soil Biology and Biochemistry 40: 1964-1966.

Trumbore, S. (2006), Carbon respired by terrestrial ecosystems - recent progress and challenges, Global Change Biol., 12, 141-153.

Trumbore, S., E. S. Da Costa, D. C. Nepstad, P. B. De Camargo, L. I. Z. A. Martinelli, D. Ray, T. Restom, and W. Silver (2006), Dynamics of fine root carbon in Amazonian tropical ecosystems and the contribution of roots to soil respiration, Global Change Biol., 12, 217-229.

Trumbore SE. Radiocarbon and Soil Carbon Dynamics (2009). Annu. Rev. Earth Planet. Sci. 37: 47–66.

Trumbore, SE and C. Czimczik (2008) An uncertain future for soil carbon. Science (Perspective) v. 321: 1455-1456.

Turnbull, J. C., J. B. Miller, S. J. Lehman, P. P. Tans, R. J. Sparks, and J. Southon (2006), Comparison of (CO2)-C-14, CO, and SF6 as tracers for recently added fossil fuel CO2 in the atmosphere and implications for biological CO2 exchange, Geophys. Res. Lett., 33 , L01817.

van der Plicht, J. et al. (2004), NotCal04 - Comparison, Radiocarbon, 46, 1225-1238.

Vargas, R. SE Trumbore and MF Allen (2009). Evidence of old carbon used to grow new fine roots in a tropical forest. New Phytologist 182: 710-718.

Vieira, S., S. Trumbore, P. B. Camargo, D. Selhorst, J. Q. Chambers, N. Higuchi, and L. A. Martinelli (2005), Slow growth rates of Amazonian trees: Consequences for carbon cycling, Proc. Natl. Acad. Sci. U. S. A., 102, 18502-18507.

Wendrich, W., R E. Taylor, J. Southon (2010). Dating stratified settlement sites at Kom K and Kom W: Fifth Millennium BCE radiocarbon ages for the Fayum Neolithic. Nuclear Instruments in Physics Research B268:999-1002.

Xu, X. , S.E. Trumbore, S. Zheng, J.R. Southon, K.E. McDuffee, M. Luttgen and J.C. Liu (2007) Modifying A Sealed Tube Zinc Reduction Method for Preparation of AMS Graphite Targets: RedUC Irvineng Background and Attaining High Precision, Nuclear Instruments and Methods in Physics Research B 259: 320-329.

Ziolkowski, L. and E.R.M. Druffel, (2009). Detection of carbon nanotubes using the benzene polycarboxylic acid method, Marine Pollution Bulletin 59, 126–131.