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Creator:: McManus, James
Abstract:: The exchange of waters between the Pacific and the Southern Oceans occurs along the eastern boundary of the South Pacific. Because water masses of the Antarctic provide a connection among the world's ocean basins, these water masses maintain the ability to influence changes in ocean circulation and climate (Lynch-Stieglitz et...
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Full Text:: DATA FOR LEG 202 SITES 1233 AND 12341 James McManus2 INTRODUCTION The exchange of waters between

Creator:: McManus, James, Nägler, Thomas F., Siebert, Christopher, Wheat, C. Geoffrey, and Hammond, Douglas E.
Abstract:: Isotopic analyses of dissolved molybdenum are presented for sediment pore waters from a reducing sedimentary basin and for fluids from a low-temperature ridge flank hydrothermal system. δ⁹⁸/⁹⁵Mo in these fluids range from 0.8 to 3.5%₀ (relative to a laboratory standard), demonstrating that marine sedimentary reactions significantly fractionate Mo isotopes. Within...
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Full Text:: : Diagenesis and hydrothermal ridge-flank alteration James McManus Large Lakes Observatory, University of

Creator:: Scholz, Florian, McManus, James, and Sommer, Stefan
Abstract:: A meaningful application of Mo as a paleo-redox proxy requires an understanding of Mo cycling in modern reducing environments. Stagnant euxinic basins such as the Black Sea are generally regarded as model systems for understanding euxinic systems during early Earth history. However, drawing direct parallels between the Black Sea and...
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Full Text:: Florian Scholz*1, James McManus1 and Stefan Sommer2 3 1College of Earth, Ocean, and Atmospheric Sciences

Creator:: McManus, James, Collier, Robert W., and Dymond, Jack
Abstract:: Subsurface hydrothermal activity dominates the heat and salt budgets of the deep water column in Crater Lake, Oregon. From a time series of conductivity-temperature-depth data and data from a thermistor chain mooring, we estimate that the net hydrothermal heat flow is ~1 W m⁻² and the corresponding salt flux is...
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Full Text:: Lake, Oregon JAMES MCMANUS, 1 ROBERT W. COLLIER, AND JACK DYMOND College of Oceanography, Oregon

Creator:: Dymond, Jack, Collier, Robert W., McManus, James, and Larson, Gary L.
Abstract:: Flux estimates show that upward mixing of the deep-water nitrate pool accounts for more than 85% of the total new nitrogen input to the euphotic zone of Crater Lake. Because measured primary productivity (360 mg C m-2 d-1) is 10–30 times higher than a level supported solely by the input...
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Full Text:: DYMOND, JACK, ROBERT COLLIER, JAMES MCMANUS, AND GARY L

Creator:: Poulson Brucker, Rebecca L., McManus, James, Severmann, Silke, and Berelson, William M.
Abstract:: We present molybdenum isotope and concentration data from 14 sites in the eastern Pacific from the central California to the Peru margin. The environments studied have been chosen to represent a broad range in oxidation-reduction (redox) potential, which provide a framework for the behavior of this redox-sensitive element. Manganese-rich hemipelagic...
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Full Text:: : Insights from Mo isotopes Rebecca L. Poulson Brucker and James McManus College of Oceanic and Atmospheric

Creator:: Abbott, April N., Haley, Brian A., and McManus, James
Abstract:: The ability to reconstruct past ocean currents is essential for determining ocean circulation’s role in global heat transport and climate change. Our understanding of the relationship between circulation and climate in the past allows us to predict the impact of future climate-driven circulation changes. One proposed tracer of past ocean...
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Full Text:: North Pacific 1 Ocean’s εNd signature 2 April N. Abbott1*, Brian A. Haley1, and James McManus1, 2 3

Creator:: Abbott, April N., Haley, Brian A., McManus, James, and Reimers, Clare E.
Abstract:: We determined pore fluid rare earth element (REE) concentrations in near-surface sediments retrieved from the continental margin off Oregon and California (USA). These sites represent shelf-to-slope settings, which lie above, within, and below the oxygen minimum zone of the Northeast Pacific. The sediments are characterized by varying degrees of net...
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Full Text:: to 6 the ocean 7 8 April N. Abbott1, Brian A. Haley1, James McManus1, 2, Clare E. Reimers1 9

Creator:: Hulme, Samuel M., Wheat, C. Geoffrey, Coggon, Rosalind M., and McManus, James
Abstract:: The data presented in this report demonstrate significant improvements in the ability to constrain trace element and Sr isotopic concentrations in sediments overlying ridge-flank hydrothermal systems. Improved sampling methods orchestrated by the Integrated Ocean Drilling Program (i.e., advanced piston coring and anoxic sample processing) enabled the collection of reactive pore...
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Full Text:: ,2 C. Geoffrey Wheat,3,4 Rosalind M. Coggon,5,6 and James McManus7 Chapter contents Abstract

Creator:: McManus, James, Collier, Robert W., Chen, Chen-Tung A., and Dymond, Jack
Abstract:: Active inputs of thermally and chemically enriched fluids at the bottom of Crater Lake create small vertical and horizontal heterogeneities in the deep-lake temperature and salt distribution. Using an internally recording CTD and a precise definition for salinity as a function of in situ conductivity and temperature, we assess the...
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Full Text:: MCMANUS, JAMES, ROBERT W. COLLIER, CHEN-TIJNG A. CHEN, AND J

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