Publications

In press or accepted

Martinez, N. C., R. W. Murray, R. C Thunell, L. C. Peterson, F. E. Müler-Karger. L. Lorenzoni, Y. Astor and R. Varela, 2009. Local and regional geochemical signatures of surface sediments from the Cariaco Basin and Orinoco Delta, Venezuela. Geology.

Müller-Karger, F., R. Varela, R. C. Thunell, M.I. Scranton, G. T. Taylor, Y. Astor, C. R. Benitez-Nelson, L. Lorenzoni, E. Tappa, M. A. Goñi, D. Rueda and C. Hu. CARIACO: a Time Series of primary production and vertical export in the Cariaco Basin. In K.K.Liu and L. Atkinson (eds.), JGOFS Continental Margins Task Team Synthesis book.

Submitted

Black, D., Thunell, R. and others. Seasonal sea surface temperature variability in the tropics, 1165-1990 A.D.: High-resolution stable isotope records from the Cariaco Basin, Venezuela. Nature

Rueda-Roa, D., T. Ezer and F. Müller-Karger. Secondary upwelling in the southeastern Caribbean Sea: Seasonal cycle and potential forcing mechanisms. Ocean Dynamics.

Woodworth, M., M.A. Goñi, E. Tappa, K. Tedesco, R. Thunell, Y. Astor, R. Varela, R.W. Murray, J.R. Díaz-Ramos and F. Müller-Karger. Seasonal succession of carbon fixation mechanisms by marine phytoplankton. Geophys. Res. Letters

Woodworth, M., M. Goñi, E. Tappa, K. Tedesco, R. Thunell, Y. Astor, R. Varela, R. Murray and F. Müller-Karger. Variable Carbon Fixation Mechanisms by Marine Phytoplankton. Nature.

2009

Elmore, A. C., R. C. Thunell, R. Styles, D. Black, R. W. Murray, N. Martinez and Y. Astor. Quantifying the seasonal variations in fluvial and eolian sources of terrigenous material to Cariaco Basin, Venezuela. J. of S. Am. Earth Sci., 27: 197-210.

Goñi, M.A., H. Aceves, C. Benitez-Nelson, E. Tappa, R. Thunell, D.E. Black, F. Muller-Karger, Y. Astor, R. Varela. Oceanographic and climatologic controls on the compositions and fluxes of biogenic materials in the water column and sediments of the Cariaco Basin over the Late Holocene. Deep Sea Res. I, Vol 56(4): 614-640

Lorenzoni, L., R. C. Thunell, C. R. Benitez-Nelson, D. Hollander, N. Martinez, E. Tappa, R. Varela, Y. Astor and F. E. Muller-Karger. The importance of subsurface nepheloid layers in transport and delivery of sediments to the eastern Cariaco Basin, Venezuela. Deep-Sea Research Part I, doi:10.1016/j.dsr.2009.08.001

McConnell, M. C., R. C. Thunell, L. Lorenzoni, Y. Astor and J. D. Wright. 2009. Seasonal variability in the salinity and oxygen isotopic composition of seawater from the Cariaco Basin, Venezuela: Implications for paleosalinity reconstructions. G3, Volume 10 (6), Q06019, doi:10.1029/2008GC002035

Romero, O. E., R. C. Thunell, Y. Astor and R. Varela. Seasonal and interannual dynamics in diatom production in the Cariaco Basin, Venezuela. Deep Sea Res. I, Vol. 56 (4): Pages 571-581.

Taylor, G. T., R. Thunell, R. Varela, C. Benitez-Nelson and M. I. Scranton. Hydrolytic ectoenzyme activity associated with suspended and sinking organic particles within the anoxic Cariaco Basin. Deep-Sea Res. I, doi:10.1016/j.dsr.2009.02.006.

Virmani, J. I., and R. H. Weisberg. Fish effects on ocean current observations in the Cariaco Basin. J. Geophys. Res., 114, C03028, doi:10.1029/2008JC004889.

2008

Alvera-Azcarate, A. A. Barth and R. H. Weisberg. A nested model of the Cariaco Basin (Venezuela): description of the basin?s interior hydrography and interactions with the open ocean. Ocean Dynamics, DOI 10.1007/s10236-008-0169-y

Lin, X., M. I. Scranton, A. Chistoserdov, R. Varela and G. T. Taylor. Spatiotemporal dynamics of bacterial populations in the anoxic Cariaco Basin. Limnol. Oceanogr., 53(1): 37-51

Thunell, R., C. Benitez-Nelson, F. Muller-Karger, L. Lorenzoni, K. Fanning, M. Scranton, R. Varela, and Y. Astor. Si cycle in the Cariaco Basin, Venezuela: Seasonal variability in silicate availability and the Si:C:N composition of sinking particles, Global Biogeochem. Cycles, 22, GB4001, doi:10.1029/2007GB003096.

2007

Black, D., M. A. Abahazi, R. C. Thunell, A. Kaplan, E. J. Tappa and L. C. Peterson. 2007.An 8-century tropical Atlantic SST record from the Cariaco Basin: Baseline variability, twentieth-century warming, and Atlantic hurricane frequency.Paleoceanography, 22, PA4204, doi:10.1029/2007PA001427.

Benitez-Nelson, C., L. P. O'Neill, R. M. Styles, R. C. Thunell and Y. Astor. 2007.Inorganic and organic sinking particulate phosphorus fluxes across the oxic/anoxic water column of Cariaco Basin, Venezuela. Marine Chemistry, 105: 90-100.

Lin, X., M. I. Scranton, R. Varela, A. Chistoserdov and G. T. Taylor. Compositional responses of bacterial communities to redox gradients and grazing in the anoxic Cariaco Basin. Aquatic Microb. Ecology, 47: 57-72.

Martinez, N. C., R.W. Murray, R. C. Thunell, L. C. Peterson, F. Muller-Karger, Y. Astor and R. Varela. Modern climate forcing of terrigenous deposition in the tropics (Cariaco Basin, Venezuela). Earth and Planetary Science Letters, 264: 438-451.

Percy, D., X. Li, G. T. Taylor, Y. Astor and M. I. Scranton. 2007. Controls on iron, manganese and intermediate oxidation state sulfur compounds in the Cariaco Basin. Mar. Chem., doi:10.1016/j.marchem.2007.02.001

Tedesco, K., R. Thunell, Y. Astor, and F. Müller-Karger. 2007.The oxygen isotope composition of planktonic foraminifera from the Cariaco Basin, Venezuela: seasonal and interannual variations. Marine Micropaleontology, 62: 180-193.

Thunell, R., C. Benitez-Nelson, R. Varela, Y. Astor and F. Müller-Karger. 2007. Particulate Organic Carbon Fluxes Along Upwelling-Dominated Continental Margins: Rates and Mechanisms. Global Biogeochemical Cycles, 21, GB1022, doi:10.1029/2006GB002793.

2006

Astor, Y. M., M.I. Scranton, L. Guzman, R. Thunnell, F. Müller-Karger, G. Taylor, K. Fanning and R. Varela. 2006. Variabilidad estacional en la estructura hidroquímica de las aguas subóxicas en la estación Serie de Tiempo Cariaco. Gayana, 70 (suplemento): 1-5.

Hayes, M. K., G. T. Taylor, Y. Astor and M. I. Scranton. Vertical distributions of thiosulfate and sulfite in the Cariaco Basin. Limnology and Oceanography, 51 (1):280-287

Kessler, J. D., W. S. Reeburgh and S. C. Tyler. Controls on Methane Concentration and Stable Isotope (δ²H-CH₄ and δ¹³C-CH₄) Distributions in the Water Columns of the Black Sea and Cariaco Basin. Global Biogeochem. Cycles, 20, GB4004, doi:10.1029/2005GB002571

Lin, X., S. G. Wakeham, I. F. Putnam, Y. M.Astor, M. I. Scranton, A. Y. Chistoserdov and G. T. Taylor. Vertical distributions of prokaryotic assemblages in the anoxic Cariaco Basin and Black Sea compared using fluorescence in situ hybridization (FISH). Appl. Environ. Microbiol. 72(4): 2679-2690

Scranton, M., Y. Astor, D. Percy, X. Li, X. Lin, and G. Taylor. 2006. Biogeoquímica de la zona subóxica y anóxica en la Fosa de Cariaco. Gayana. 70 (suplemento): 6-83-86.

Scranton, M.I., M. McIntyre, G.T. Taylor, F. Muller-Karger, K. Fanning, and Y.Astor.Temporal Variability in the Nutrient Chemistry of the Cariaco Basin. In: Neretin LN (ed.), Past and Present Water Column Anoxia. NATO Science Series, Springer, Netherlands, p. 139-160

Stoeck, T., B. Hayward, G. T. Taylor, R. Varela and S. S. Epstein. 2006. A Multiple PCR-primer Approach to Access the Microeukaryotic Diversity in Environmental Samples.Protist, 157: 31-43

Taylor, G.T., M. Iabichella-Armas, R. Varela, F. Müller-Karger, X. Lin and M.I. Scranton. 2006.Microbial Ecology of the Cariaco Basin's oxic-anoxic interface: the U.S.-Venezuela CARIACO Times Series Program. In: Neretin LN (ed.) Past and Present Water Column Anoxia. NATO Science Series, Springer, Netherlands, p. 473-499.

2005

Astor, Y. M. , M.I. Scranton, F. Müller-Karger, R. Bohrer, and J.García. 2005. Seasonal and interannual fCO2 variability in a tropical coastal upwelling system. Mar. Chem. 97 (3-4): 245-261.

Kessler, J. D. and W. S. Reeburgh. 2005. Preparation of natural methane samples for stable isotope and radiocarbon analysis. Limnology and Oceanography: Methods, Vol. 3, 408-418.

Kessler, J.D., Reeburgh, W.S., Southon, J. and R. Varela. 2005. Fossil methane sources dominates Cariaco Basin water column methane geochemistry. Geophys. Res. Letters, Vol. 32, L12609.

Müller-Karger, F., R. Varela, R. Thunell, M. Scranton, G. Taylor, J. Capelo, Y. Astor, E. Tappa, J. Akl and T-Y. Ho. 2005. Características de la Fosa de Cariaco y su importancia desde el punto de vista oceanográfico. Mem. Fund. La Salle Cienc. Nat., Vol. 161-162: 215-234.

Müller-Karger, F. E., C. Hu, S. Andréfouët, and R. Varela. 2005 The Color of the Coastal Ocean and applications in the solution of research and management problems. In: Remote Sensing of Coastal Aquatic Environments. Richard L. Miller, Carlos E. Del Castillo, Brent A. McKee (Editors). Kluwer Academic Publishers.

Müller-Karger, F., R. Varela, R. Thunell, R. Luerssen, C. Hu and J. J. Walsh. 2005. The importance of continental margins in the global carbon cycle. Geophys. Res. Letters, Vol. 32, L01602, doi:10.1029/2004GL021346.

O'Neill, L. P., C. R. Benitez-Nelson, R. M. Styles, E. Tappa and R. C. Thunell. 2005. Diagenetic effects on particulate phosphorus samples collected using formalin-poisoned sediment traps. Limnol. Oceanogr. Methods, 3: 308-317.

2004

Astor, Y.M., F. Müller-Karger, R. Bohrer, J. García and L. Troccolis. 2005. Variabilidad interanual y estacional del CO₂ y nutrientes en la Fosa de Cariaco. Mem. Fund. La Salle Cienc. Nat. Vol. 161-162: 235-252.

Benitez-Nelson, C. R., L. P. O'Neill, L. C. Kolowith, P. Pellechia and R. Thunell. 2004. Phosphonates and particulate organic phosphorus cycling in an anoxic marine basin. Limnol. Oceanogr., 49(5): 1593-1604

Black, D. E., R.C. Thunnell, A. Kaplan, L.C. Petersen and E. Tappa. A 2000-year record of Caribbean and tropical North Atlantic hydrographic variability. Paleoceanography (19) PA2022,doi:10.1029/2003PA000982.

Goñi, M.A., M.P. Woodworth, H.L. Aceves, R.C. Thunnell, E. Tappa, D. Black, F. Müller-Karger, Y. Astor, and R. Varela. 2004. Generation, transport and preservation of the alkenone-based U^K'₃₇ sea surface temperature index in the water column and sediments of the Cariaco Basin (Venezuela). Global Biogeochem. Cycles, 18, GB2001, doi:10.1029/2003GB002132.

Ho, T-Y., Y. Astor, R. Varela, G.T. Taylor, and M.I. Scranton. 2004. Vertical and temporal variability of redox zonation in the water column of the Cariaco Basin: implications for organic carbon oxidation pathways. Mar. Chem., 86: 89-104.

Müller-Karger, F. E., R. Varela, R. Thunell, Y. Astor, H. Zhang, and C. Hu. 2004. Processes of Coastal Upwelling and Carbon Flux in the Cariaco Basin. Deep-Sea Res. II. 51: 927-943. [doi:10.1016/j.dsr2.2003.10.010]

Smoak, J.M., C. Benitez-Nelson, W. S. Moore, R.C. Thunell, Y. Astor and F. Müller-Karger. 2004. Radionuclide fluxes and particle scavenging in Cariaco Basin. Cont. Shelf Res., 24: 1451-1463.

Thunell, R., D.M. Sigman, F. Müller-Karger, Y. Astor, and R. Varela. 2004. Nitrogen isotope dynamics of the Cariaco Basin, Venezuela. Global Biochem. Cycles, 18: 13 pgs. [doi:10.1029/2003GB002185]

Woodworth, M., M.A. Goñi, E. Tappa, K. Tedesco, R. Thunell, Y. Astor, R. Varela, J.R. Díaz-Ramos and F. Müller-Karger. Oceanographic controls on the carbon isotopic compositions of sinking particles from the Cariaco Basin. Deep-Sea Res. I, 51: 1955-1974.

2003

Astor,Y.M., F. Müller-Karger and M. I. Scranton. 2003. Seasonal and Interannual Variation in the Hydrography of the Cariaco Basin: Implications for Basin Ventilation. Cont. Shelf Res. 23: 125-144.

Bernhard, J. 2003. Potential Symbionts in bathyal foraminifera. Science, 299: 861.

Goñi, M.A., H. L. Aceves, R. C. Thunell, E. Tappa, Y. Astor, R. Varela and F. Müller-Karger. 2003. Biogenic fluxes in the Cariaco Basin: A combined study of sinking particulates and underlying sediments. Deep-Sea Res. I., 50: 781-807.

Stoeck, T., G.T. Taylor, Y. Astor and S.Epstein. 2003. Novel eukaryotes from a permanently anoxic marine environment. App. and Environ. Microbiol. 69 (9): 5656-5663.

Taylor,G., C. Hein, and M. Iabichella. 2003. Temporal variations in viral distributions in the anoxic Cariaco Basin. Aquatic Microbiol. Ecol., 30:103-116.

Tedesco, K. and Thunell, R. 2003. High resolution tropical climate record for the last 6,000 years. Geophys. Res. Letters, 30 (17) CLM 2. [doi:10.1029/2003GL017959]

Tedesco, K. and Thunell, R. 2003. Seasonal and interannual variations in planktonic foraminiferal flux and assemblage composition in the Cariaco Basin, Venezuela. J. of Foraminiferal Res., 33(3): 192-210.

2002

Castellanos, P., R. Varela and F. Müller-Karger. 2002. Descripción de las áreas de surgencia al sur del mar Caribe examinadas con el sensor infrarojo AVHRR. Mem. Fund. La Salle Cienc. Nat., 154:55-76.

Ho, T.-Y., M. I. Scranton, G. T. Taylor, R.Varela, R C. Thunell, and F Müller-Karger. 2002. Acetate cycling in the water column of the Cariaco Basin: Seasonal and vertical variability and implication for carbon cycling. Limnol. Oceanogr. 47: 1119-1128.

Scranton, M.I., Taylor, G.T., Astor. Y. and F. Müller-Karger. 2002. Comparison of the controls on the structure of the oxic/anoxic interface in the Cariaco Basin and the Black Sea. p. 628-634. In A. Yilmaz (ed.), Proceedings of the Second International Conference on Oceanography of the Eastern Mediterranean and Black Sea: Similarities and Differences of Two Interconnected Basins, Turkey.

2001

Madrid, V.M., G.T. Taylor, M.I. Scranton and A.Y. Chistoserdov. 2001. Phylogenetic communities in the anoxic zone of the Cariaco Basin. Appl. Environ. Microbiol., 67: 1663-1674.

Müller-Karger, F. E. R. Varela, R. Thunell, M. Scranton, R. Bohrer, G. Taylor, J. Capelo, Y. Astor, E. Tappa, T. Y. Ho, and J. J. Walsh. 2001. Annual Cycle of Primary Production in the Cariaco Basin: Response to upwelling and implications for vertical export. J. of Geophys. Res., 106 (C3): 4527-4542.

Müller-Karger,F., C. Hu, J.P. Akl, and R. Varela. 2001. Validation of carbon flux and related products for SIMBIOS: the CARIACO continental margin time series and the Orinico River plume. In R. McClain (ed.) SIMBIOS project 2001 Annual Report. NASA/TM- 2001-209976.

Scranton, M. I., Y. Astor, R. Bohrer, T.-Y. Ho, and F. E. Müller-Karger. 2001. Controls on temporal variability of the geochemistry of the deep Cariaco Basin. Deep-Sea Res. I, 48: 1605-1625.

Taylor, G., M. Scranton, M. Iabichella, T.Y. Ho and R. Varela. 2001. Chemoautotrophy in the redox transition zone of the Cariaco Basin, a significant source of midwater organic carbon production. Limnol. Oceanogr., 46:148-163.

2000

Díaz-Ramos, J.R., F. E. Müller-Karger, D. Millie, L. E. Troccoli-Ghinaglia, S. S. Subero-Pino and R. Varela. 2000. Phytoplankton community structure: temporal variability in a tropical upwelling ecosystem. Abstract. J. of Phycology. 36 (s3), 18.

Müller-Karger, F., R. Varela, R. Thunell, M. Scranton, R. Bohrer, G. Taylor, J. Capelo, Y. Astor, E. Tappa, T.- Y. Ho, M. Iabichella, J. J. Walsh, and J. R. Diaz. 2000. Sediment record linked to surface processes in the Cariaco Basin. EOS. AGU Transactions. American Geophysical Union, 81 (45): 529, 534-535.

Thunell, R., R. Varela, M. Llano, J. Collister, F. Müller-Karger, and R. Bohrer. 2000. Organic carbon fluxes, degradation, and accumulation in an anoxic basin: sediment trap results from the Cariaco Basin. Limnol. Oceanogr., 45 (2), 300-308.

1999

Müller-Karger, F. E., C. Hu and R. Varela. 1999. Validation of carbon flux and related products for SIMBIOS: the CARIACO continental margin time series and the Orinoco River plume. In R. McClain (ed.), SIMBIOS Project 1999 Annual Report, ASA/TM - 1999-208645:71-73.

Thunell, R., E. Tappa, R. Varela, M. Llano, Y. Astor, F. Müller-Karger and R. Bohrer. 1999. Increased marine sediment suspension and fluxes following an earthquake. Nature, 398: 233-236.

Tedesco K, R. C. Thunell, and E. J. Tappa. 1999. Isotopic Composition of Planktonic Foraminifera from the Cariaco Basin, Venezuela. EOS, 80(46): 104.

Walsh, J.J., D.A. Dieterle, F.E. Müller-Karger, R. Bohrer, W.P. Bissett, , R. Aparicio, R.J. Varela H.T. Hochman, C. Schiller , R. Diaz, R. Thunell, G.T. Taylor, M.I. Scranton, K.A. Fanning, and E.T. Pelzer. 1999. Simulation of carbon/nitrogen cycling during spring upwelling in the Cariaco Basin. J. Geophys. Res., 104 (C4):7807-7825.

1998

Astor, Y., J. Meri and F. Muller Karger. 1998. Variabilidad estacional hidrográfica en la Fosa de Cariaco. Mem. Soc. Cien. Nat. La Salle, 63 (149): 61-72.

Black, D. E., K. A. Tedesco, R. C. Thunell, E. J. Tappa, and L. C. Peterson. 1998. Ultra-high Resolution Stable Isotope Records From Multiple Species of Planktonic Foraminifera From the Anoxic Cariaco Basin, Venezuela. EOS, 79(4): 494.

1997

Tedesco K, R Thunell, E Tappa, F Müller-Karger, and R Bohrer. 1997. Seasonal and Bathymetric Distribution of Planktonic Foraminifera in the Cariaco Basin. EOS, 78(46): 342.

Thunell, R. 1997. Continental margin particle flux: Seasonal cycles and archives of global change. Oceanus, 40, 20-24.

1996

Walsh, J.J. 1996. Nitrogen fixation within a tropical upwelling ecosystem: Evidence for a Redfield budget of carbon/nitrogen cycling by the total phytoplankton community. J. of Geophys. Res., 101 (C9): 20,607-20,616.