Index Catalog // ScholarsArchive@OSU

The manganese and iron shuttle in a modern euxinic basin and implications for molybdenum cycling at euxinic ocean margins

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...
Resource Type:: Article
Full Text:: Florian Scholz*1, James McManus1 and Stefan Sommer2 3 1College of Earth, Ocean, and Atmospheric Sciences

Unbalanced particle flux budgets in Crater Lake, Oregon: Implications for edge effects and sediment focusing in lakes

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...
Resource Type:: Article
Full Text:: DYMOND, JACK, ROBERT COLLIER, JAMES MCMANUS, AND GARY L

Oceanic germanium/silicon ratios: Evaluation of the potential overprint of temperature on weathering signals

Creator:: Hammond, Douglas E., McManus, James, and Berelson, William M.
Abstract:: Diatom remains indicate the oceanic Ge/Si ratio (μmol/mol) has varied temporally, ranging from Miocene values of 0.9 to Last Glacial Maximum (LGM) values of 0.55, with the present value of 0.69. These ratios lie between those for the primary sources for these elements: continental weathering (Ge/Si = 0.5) and hydrothermal...
Resource Type:: Article
Full Text:: Sciences, University of Southern California, Los Angeles, California, USA James McManus College of Oceanic

Bottoms up: Sedimentary control of the deep North Pacific Ocean’s ε[subscript Nd] signature

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...
Resource Type:: Article
Full Text:: North Pacific 1 Ocean’s εNd signature 2 April N. Abbott1*, Brian A. Haley1, and James McManus1, 2 3

The sedimentary flux of dissolved rare earth elements to the ocean

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...
Resource Type:: Article
Full Text:: to 6 the ocean 7 8 April N. Abbott1, Brian A. Haley1, James McManus1, 2, Clare E. Reimers1 9

The impact of Sedimentary Coatings on the Diagenetic Nd Flux

Creator:: Abbott, April N., Haley, Brian A., and McManus, James
Abstract:: Because ocean circulation impacts global heat transport, understanding the relationship between deep ocean circulation and climate is important for predicting the ocean's role in climate change. A common approach to reconstruct ocean circulation patterns employs the neodymium isotope compositions of authigenic phases recovered from marine sediments. In this approach, mild...
Resource Type:: Article
Full Text:: Sedimentary Coatings on the Diagenetic Nd Flux 1 2 April N. Abbott1,2*, Brian A. Haley1, James

A critical scale in plankton aggregations across coastal ecosystems

Creator:: Benoit-Bird, Kelly J., Shroyer, Emily L., and McManus, Margaret A.
Abstract:: We examined the characteristics of biological patches at four different locations to assess the relationship of patch vertical scale, amplitude, and persistence. In contrast to patches of larger animals, we found that the majority of coherent aggregations of plankton at each site were vertically compressed, with most smaller than 5m...
Resource Type:: Article
Full Text:: -Bird, K. J., E. L. Shroyer, and M. A. McManus (2013), A critical scale in plankton aggregations across

Methods for measuring benthic nutrient flux on the California Margin: Comparing shipboard core incubations to in situ lander results

Creator:: Hammond, Douglas E., Cummins, Kathleen M., McManus, James, Berelson, William M., Smith, Gerry, and Spagnoli, Federico
Abstract:: The objective of this study was to compare two techniques for estimating benthic fluxes of nutrients (nitrate, phosphate, and silicic acid) and Ge/Si flux ratios. In situ flux chambers were deployed, and cores were collected and incubated at 9 sites along the California margin in July 2001. Both techniques were...
Resource Type:: Article
Full Text:: Douglas E Hammond, Kathy M Cummins, James McManus, William M

Global climate evolution during the last deglaciation

Creator:: Clark, Peter U., Shakun, Jeremy D., Baker, Paul A., Bartlein, Patrick J., Brewer, Simon, Brook, Edward J., Carlson, Anders E., Cheng, Hai, Kaufman, Darrell S., Liu, Zhengyu, Marchitto, Thomas M., Mix, Alan C., Morrill, Carrie, Otto-Bliesner, Bette L., Pahnke, Katharina, Russell, James M., Whitlock, Cathy, Adkins, Jess F., Blois, Jessica L., Clark, Jorie, Colman, Steven M., Curry, William B., Flower, Ben P., He, Feng, Johnson, Thomas C., Lynch-Stieglitz, Jean, Markgraf, Vera, McManus, Jerry, Mitrovica, Jerry X., Moreno, Patricio I., and Williams, John W.
Abstract:: Deciphering the evolution of global climate from the end of the Last Glacial Maximum approximately 19 ka to the early Holocene 11 ka presents an outstanding opportunity for understanding the transient response of Earth's climate system to external and internal forcings. During this interval of global warming, the decay of...
Resource Type:: Article
Full Text:: , Alan C. Mixa, Carrie Morrillm, Bette L. Otto-Bliesnern, Katharina Pahnkeo, James M. Russellp, Cathy

Satellite views of Pacific chlorophyll variability: comparisons to physical variability, local versus nonlocal influences and links to climate indices

Creator:: Thomas, Andrew C., Strub, P. Ted, Weatherbee, Ryan A., and James, Corinne
Abstract:: Concurrent satellite-measured chlorophyll (CHL), sea surface temperature (SST), sea level anomaly (SLA) and model-derived wind vectors from the 13+ year SeaWiFS period September 1997 – December 2010 quantify time and space patterns of phytoplankton variability and its links to physical forcing in the Pacific Ocean. The CHL fields are a...
Resource Type:: Preprint and Article
Full Text:: oceanic pathways (e.g. Hormazabal et al., 2001; Strub and James, 2002c). Along the eastern basin margins

ScholarsArchive@OSU

The manganese and iron shuttle in a modern euxinic basin and implications for molybdenum cycling at euxinic ocean margins

Unbalanced particle flux budgets in Crater Lake, Oregon: Implications for edge effects and sediment focusing in lakes

Oceanic germanium/silicon ratios: Evaluation of the potential overprint of temperature on weathering signals

Bottoms up: Sedimentary control of the deep North Pacific Ocean’s ε[subscript Nd] signature

The sedimentary flux of dissolved rare earth elements to the ocean

The impact of Sedimentary Coatings on the Diagenetic Nd Flux

A critical scale in plankton aggregations across coastal ecosystems

Methods for measuring benthic nutrient flux on the California Margin: Comparing shipboard core incubations to in situ lander results

Global climate evolution during the last deglaciation

Satellite views of Pacific chlorophyll variability: comparisons to physical variability, local versus nonlocal influences and links to climate indices

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