Index Catalog // ScholarsArchive@OSU

Nitrogen isotope simulations show the importance of atmospheric iron deposition for nitrogen fixation across the Pacific Ocean

Creator:: Somes, Christopher J., Schmittner, Andreas, and Altabet, Mark A.
Abstract:: Nitrogen (N) fixation by specialized microorganisms (diazotrophs) influences global plankton productivity because it provides the ocean with most of its bio-available N. However, its global rate and large-scale spatial distribution is still regarded with considerable uncertainty. Here we use a global ocean nitrogen isotope model, in comparison with δ15NO3 observations,...
Resource Type:: Article
Full Text:: . Somes,1 Andreas Schmittner,1 and Mark A. Altabet2 4 Received 1 July 2010; revised 8 September 2010

Simulating the global distribution of nitrogen isotopes in the ocean

Creator:: Somes, Christopher J., Schmittner, Andreas, Galbraith, Eric D., Lehmann, Moritz F., Altabet, Mark A., Montoya, Joseph P., Letelier, Ricardo M., Mix, Alan C., Bourbonnais, Annie, and Eby, Michael
Abstract:: We present a new nitrogen isotope model incorporated into the three-dimensional ocean component of a global Earth system climate model designed for millennial timescale simulations. The model includes prognostic tracers for the two stable nitrogen isotopes, 14N and 15N, in the nitrate (NO3−), phytoplankton, zooplankton, and detritus variables of the...
Resource Type:: Article
Full Text:: ,2 Moritz F. Lehmann,3 3 Mark A. Altabet,4 Joseph P. Montoya,5 Ricardo M. Letelier,1 Alan C. Mix,1

Physical-biological interactions in the Southern Ocean

Creator:: Moore, Jefferson Keith
Abstract:: Physical-biological interactions in the Southern Ocean were investigated using remote sensing data from several different satellite sensors. Satellite sea surface temperature data were used to study the dynamics of the Antarctic Polar Front (PF). Satellite ocean color data were used to estimate surface chlorophyll concentrations and their relation to various...
Resource Type:: Dissertation
Full Text:: -Biological Interactions in the Southern Ocean. Abstract approved: Mark Abbott Physical-biological

A review of nitrogen isotopic alteration in marine sediments

Creator:: Robinson, Rebecca S., Kienast, Markus, Albuquerque, Ana Luiza, Altabet, Mark, Contreras, Sergio, De Pol Holz, Ricardo, Dubois, Nathalie, Francois, Roger, Galbraith, Eric, Hsu, Ting-Chang, Ivanochko, Tara, Jaccard, Samuel, Kao, Shuh-Ji, Kiefer, Thorsten, Kienast, Stephanie, Lehmann, Moritz, Martinez, Philippe, McCarthy, Matthew, Mobius, Jurgen, Pedersen, Tom, Quan, Tracy M., Ryabenko, Evgeniya, Schmittner, Andreas, Schneider, Ralph, Schneider-Mor, Aya, Shigemitsu, Masahito, Sinclair, Dan, Somes, Christopher, Studer, Anja, Thunell, Robert, and Yang, Jin-Yu
Abstract:: Nitrogen isotopes are an important tool for evaluating past biogeochemical cycling from the paleoceanographic record. However, bulk sedimentary nitrogen isotope ratios, which can be determined routinely and at minimal cost, may be altered during burial and early sedimentary diagenesis, particularly outside of continental margin settings. The causes and detailed mechanisms...
Resource Type:: Article
Full Text:: marine sediments Rebecca S. Robinson,1 Markus Kienast,2 Ana Luiza Albuquerque,3 Mark Altabet,4 Sergio

Light driven seasonal patterns of chlorophyll and nitrate in the lower euphotic zone of the North Pacific Subtropical Gyre

Creator:: Letelier, Ricardo M., Karl, David M., Abbott, Mark R., and Bidigare, Robert R.
Abstract:: The euphotic zone below the deep chlorophyll maximum layer (DCML) at Station ALOHA (a long-term oligotrophic habitat assessment; 22º45′N, 158º00′W) transects the nearly permanently stratified upper thermocline. Hence, seasonal changes in solar radiation control the balance between photosynthesis and respiration in this lightlimited region. Combining profiles of radiance reflectance, algal...
Resource Type:: Article
Full Text:: Letelier, Ricardo M., David M. Karl, Mark R. Abbott, and Robert R

The Southern Ocean at the last glacial maximum : a strong sink for atmospheric carbon dioxide

Creator:: Moore, J. Keith, Abbott, Mark R., Richman, James G., and Nelson, David M.
Abstract:: Analysis of satellite ocean color, sea surface temperature, and sea ice cover data reveals consistent patterns between biological production, iron availability, and physical forcings in the Southern Ocean. The consistency of these patterns, in conjunction with information on physical conditions during the last glacial maximum (LGM), enables estimates of export...
Resource Type:: Article
Full Text:: J. Keith Moore, • Mark R. Abbott, James G. Richman, and David M. Nelson Oregon State Unive•ity

Predictability and constraints on the structure of ecological communities in the context of climate change

Creator:: Barner, Allison K.
Abstract:: Ecologists must increasingly balance the need for accurate predictions about how ecosystems will be affected by climate change, against the fact that making such predictions at the ecosystem-level may be infeasible. Although information about responses of individual species to a changing environment is increasing, scaling such information to the community...
Resource Type:: Dissertation
Full Text:: , and Mark Novak, for their guidance and support throughout my Ph.D. In particular, I am grateful for

Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation

Creator:: Somes, Christopher J.
Abstract:: We present a new nitrogen isotope model incorporated into the three-dimensional ocean component of a global Earth System Climate Model designed for millennial timescale simulations. The model includes prognostic tracers for the stable nitrogen isotopes, ¹⁴N and ¹⁵N, in the nitrate (NO₃ˉ), phytoplankton, zooplankton, and detritus variables of the marine...
Resource Type:: Masters Thesis
Full Text:: Galbraith, Moritz Lehmann, Mark Altabet, and Joe Montoya have also provided useful comments that have

Simulated 21st century’s increase in oceanic suboxia by CO2-enhanced biotic carbon export

Creator:: Oschlies, Andreas, Schulz, Kai G., Riebesell, Ulf, and Schmittner, Andreas
Abstract:: The primary impacts of anthropogenic CO2 emissions on marine biogeochemical cycles predicted so far include ocean acidification, global warming induced shifts in biogeographical provinces, and a possible negative feedback on atmospheric CO2 levels by CO2-fertilized biological production. Here we report a new potentially significant impact on the oxygen-minimum zones of...
Resource Type:: Article
Full Text:: the past, in concert with changes in the extent of the suboxic ocean areas [Altabet et al., 1995, 2002

Utilization of inorganic and organic nitrogen by phytoplankton off the Washington and Oregon coasts

Creator:: Kokkinakis, Steven Andon
Resource Type:: Masters Thesis
Full Text:: necessary for maximum efficiency per unit time. I am also grateful to Mark "Dr. Methods" Brzezinski for

ScholarsArchive@OSU

Nitrogen isotope simulations show the importance of atmospheric iron deposition for nitrogen fixation across the Pacific Ocean

Simulating the global distribution of nitrogen isotopes in the ocean

Physical-biological interactions in the Southern Ocean

A review of nitrogen isotopic alteration in marine sediments

Light driven seasonal patterns of chlorophyll and nitrate in the lower euphotic zone of the North Pacific Subtropical Gyre

The Southern Ocean at the last glacial maximum : a strong sink for atmospheric carbon dioxide

Predictability and constraints on the structure of ecological communities in the context of climate change

Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation

Simulated 21st century’s increase in oceanic suboxia by CO2-enhanced biotic carbon export

Utilization of inorganic and organic nitrogen by phytoplankton off the Washington and Oregon coasts

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