Now showing items 21-40 of 802

  • Anticipating ocean acidification's economic consequences for commercial fisheries 

    Cooley, Sarah R.; Doney, Scott C. (2009-05)
    Ocean acidification, a consequence of rising anthropogenic CO2 emissions, is poised to change marine ecosystems profoundly by increasing dissolved CO2 and decreasing ocean pH, carbonate concentration, and calcium carbonate ...
  • Apparent oxygen utilization rates calculated from tritium and helium-3 profiles at the Bermuda Atlantic Time-series Study site 

    Stanley, Rachel H. R.; Doney, Scott C.; Jenkins, William J.; Lott, Dempsey E. (Copernicus Publications on behalf of the European Geosciences Union., 2012-06-04)
    We present three years of Apparent Oxygen Utilization Rates (AOUR) estimated from oxygen and tracer data collected over the ocean thermocline at monthly resolution between 2003 and 2006 at the Bermuda Atlantic Time-series ...
  • Applications of fluorescence spectroscopy to environmental chemistry 

    Green, Sarah A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1992-02)
    The work presented in this thesis consists of three parts. The first is a photophysical study of the mechanism of fluorescence quenching by stable nitroxyl radicals, which are becoming an important analytical tool for ...
  • Applications of PB-210/RA-226 and PO-210/PB-210 disequilibria in the study of marine geochemical processes 

    Bacon, Michael P. (Woods Hole Oceanographic Institution, 1976-02)
    The distribution of Pb-210 and Po-210 in dissolved (<O.4 micron) and particulate (>0.4 micron) phases has been measured at ten stations in the tropical and eastern North Atlantic and at two stations in the Pacific. Both ...
  • Aqueous phase methylation as a potential source of methylmercury in wet deposition 

    Hammerschmidt, Chad R.; Lamborg, Carl H.; Fitzgerald, William F. (2006-10-17)
    The source of monomethylmercury (MMHg) in wet deposition is unknown. Volatilization of gaseous MMHg, evasion and demethylation of dimethylmercury, and methylation of Hg0 have been either proposed or tested unsuccessfully ...
  • The Arabian Sea as a high-nutrient, low-chlorophyll region during the late Southwest Monsoon 

    Naqvi, S. W. A.; Moffett, James W.; Gauns, M. U.; Narvekar, P. V.; Pratihary, A. K.; Naik, H.; Shenoy, D. M.; Jayakumar, D. A.; Goepfert, Tyler J.; Patra, Prabir K.; Al-Azri, Adnan; Ahmed, S. I. (Copernicus Publications on behalf of the European Geosciences Union, 2010-07-05)
    Extensive observations were made during the late Southwest Monsoon of 2004 over the Indian and Omani shelves, and along a transect that extended from the southern coast of Oman to the central west coast of India, tracking ...
  • Archaeal nitrification in the ocean 

    Wuchter, Cornelia; Abbas, Ben; Coolen, Marco J. L.; Herfort, Lydie; van Bleijswijk, Judith; Timmers, Peer; Strous, Marc; Teira, Eva; Herndl, Gerhard J.; Middelburg, Jack J.; Schouten, Stefan; Sinninghe Damste, Jaap S. (2006-01-30)
    Marine Crenarchaeota are the most abundant single group of prokaryotes in the ocean but their physiology and role in marine biogeochemical cycles are unknown. Recently, a member of this clade was isolated from a sea aquarium ...
  • Aspects of the biogeochemistry of carbohydrates in aquatic environments 

    Mopper, Kenneth (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1973-06)
    The goal of this thesis is to examine the distribution and diagenesis of carbohydrates in aquatic environments. The following questions are studied: what is the carbohydrate composition of sediment in different environments ...
  • Assessing the health of the U.S. west coast with a regional-scale application of the Ocean Health Index 

    Halpern, Benjamin S.; Longo, Catherine; Scarborough, Courtney; Hardy, Darren; Best, Benjamin D.; Doney, Scott C.; Katona, Steven K.; McLeod, Karen L.; Rosenberg, Andrew A.; Samhouri, Jameal F. (Public Library of Science, 2014-06-18)
    Management of marine ecosystems increasingly demands comprehensive and quantitative assessments of ocean health, but lacks a tool to do so. We applied the recently developed Ocean Health Index to assess ocean health in the ...
  • Assessing the uncertainties of model estimates of primary productivity in the tropical Pacific Ocean 

    Friedrichs, Marjorie A. M.; Carr, Mary-Elena; Barber, Richard T.; Scardi, Michele; Antoine, David; Armstrong, Robert A.; Asanuma, Ichio; Behrenfeld, Michael J.; Buitenhuis, Erik T.; Chai, Fei; Christian, James R.; Ciotti, Aurea M.; Doney, Scott C.; Dowell, Mark; Dunne, John P.; Gentili, Bernard; Gregg, Watson; Hoepffner, Nicolas; Ishizaka, Joji; Kameda, Takahiko; Lima, Ivan D.; Marra, John; Melin, Frederic; Moore, J. Keith; Morel, Andre; O'Malley, Robert T.; O'Reilly, Jay; Saba, Vincent S.; Schmeltz, Marjorie; Smyth, Tim J.; Tjiputra, Jerry; Waters, Kirk; Westberry, Toby K.; Winguth, Arne (2008-03)
    Depth-integrated primary productivity (PP) estimates obtained from satellite ocean color based models (SatPPMs) and those generated from biogeochemical ocean general circulation models (BOGCMs) represent a key resource ...
  • Assessment of groundwater discharges into West Neck Bay, New York, via natural tracers 

    Dulaiova, Henrieta; Burnett, William C.; Chanton, Jeffrey P.; Moore, Willard S.; Bokuniewicz, H. J.; Charette, Matthew A.; Sholkovitz, Edward R. (2006-05-21)
    A field experiment to compare methods of assessing submarine groundwater discharge (SGD) was held on Shelter Island, NY, in May 2002. We evaluated the use of radon, radium isotopes, and methane to assess SGD rates and ...
  • An assessment of particulate organic carbon to thorium-234 ratios in the ocean and their impact on the application of 234Th as a POC flux proxy 

    Buesseler, Ken O.; Benitez-Nelson, Claudia R.; Burd, Adrian B.; Charette, Matthew A.; Cochran, J. Kirk; Coppola, L.; Fisher, Nicholas S.; Fowler, S. W.; Gardner, Wilford D.; Guo, L. D.; Gustafsson, Orjan; Lamborg, Carl H.; Masque, Pere; Miquel, Juan Carlos; Passow, Uta; Santschi, Peter H.; Savoye, Nicolas; Stewart, G.; Trull, Thomas W. (2005-06-18)
    Thorium-234 is increasingly used as a tracer of ocean particle flux, primarily as a means to estimate particulate organic carbon export from the surface ocean. This requires determination of both the 234Th activity ...
  • Assessment of skill and portability in regional marine biogeochemical models : role of multiple planktonic groups 

    Friedrichs, Marjorie A. M.; Dusenberry, Jeffrey A.; Anderson, Laurence A.; Armstrong, Robert A.; Chai, Fei; Christian, James R.; Doney, Scott C.; Dunne, John P.; Fujii, Masahiko; Hood, Raleigh; McGillicuddy, Dennis J.; Moore, J. Keith; Schartau, Markus; Spitz, Yvette H.; Wiggert, Jerry D. (American Geophysical Union, 2007-08-02)
    Application of biogeochemical models to the study of marine ecosystems is pervasive, yet objective quantification of these models' performance is rare. Here, 12 lower trophic level models of varying complexity are objectively ...
  • An assessment of the Atlantic and Arctic sea–air CO2 fluxes, 1990–2009 

    Schuster, Ute; McKinley, Galen A.; Bates, Nicholas R.; Chevallier, F.; Doney, Scott C.; Fay, A. R.; Gonzalez-Davila, M.; Gruber, Nicolas; Jones, S.; Krijnen, J.; Landschutzer, P.; Lefevre, N.; Manizza, Manfredi; Mathis, Jeremy T.; Metzl, Nicolas; Olsen, A.; Rios, Aida F.; Rodenbeck, C.; Santana-Casiano, J. M.; Takahashi, Taro; Wanninkhof, Rik; Watson, Andrew J. (Copernicus Publications on behalf of the European Geosciences Union, 2013-01-29)
    The Atlantic and Arctic Oceans are critical components of the global carbon cycle. Here we quantify the net sea–air CO2 flux, for the first time, across different methodologies for consistent time and space scales for the ...
  • An assessment of the use of sediment traps for estimating upper ocean particle fluxes 

    Buesseler, Ken O.; Antia, Avan N.; Chen, Min; Fowler, Scott W.; Gardner, Wilford D.; Gustafsson, Orjan; Harada, Koh; Michaels, Anthony F.; Rutgers van der Loeff, Michiel M.; Sarin, Manmohan M.; Steinberg, Deborah K.; Trull, Thomas W. (Sears Foundation for Marine Research, 2007-05)
    This review provides an assessment of sediment trap accuracy issues by gathering data to address trap hydrodynamics, the problem of zooplankton "swimmers," and the solubilization of material after collection. For each ...
  • Asteroid breakup linked to the Great Ordovician Biodiversification Event 

    Schmitz, Birger; Harper, David A. T.; Peucker-Ehrenbrink, Bernhard; Stouge, Svend; Alwmark, Carl; Cronholm, Anders; Bergstrom, Stig M.; Tassinari, Mario; Xiaofeng, Wang (2007-09-26)
    The rise and diversification of shelled invertebrate life in the early Phanerozoic took place in two major steps. During the Cambrian Explosion at ca. 540 Ma a large number of new phyla appeared over a short time interval. ...
  • Atmospheric carbon dioxide variability in the Community Earth System Model : evaluation and transient dynamics during the twentieth and twenty-first centuries 

    Keppel-Aleks, Gretchen; Randerson, James T.; Lindsay, Keith; Stephens, Britton B.; Moore, J. Keith; Doney, Scott C.; Thornton, Peter E.; Mahowald, Natalie M.; Hoffman, Forrest M.; Sweeney, Colm; Tans, Pieter P.; Wennberg, Paul O.; Wofsy, Steven C. (American Meteorological Society, 2013-07-01)
    Changes in atmospheric CO2 variability during the twenty-first century may provide insight about ecosystem responses to climate change and have implications for the design of carbon monitoring programs. This paper describes ...
  • Atmospheric mercury and fine particulate matter in coastal New England : implications for mercury and trace element sources in the northeastern United States 

    Kolker, Allan; Engle, Mark A.; Peucker-Ehrenbrink, Bernhard; Geboy, Nicholas J.; Krabbenhoft, David P.; Bothner, Michael H.; Tate, Michael T. (Elsevier B.V., 2013-08-29)
    Intensive sampling of ambient atmospheric fine particulate matter was conducted at Woods Hole, Massachusetts over a four-month period from 3 April to 29 July, 2008, in conjunction with year-long deployment of the USGS ...
  • Authigenic iron oxide proxies for marine zinc over geological time and implications for eukaryotic metallome evolution 

    Robbins, L. J.; Lalonde, S. V.; Saito, Mak A.; Planavsky, N. J.; Mloszewska, A. M.; Pecoits, E.; Scott, C.; Dupont, C. L.; Kappler, A.; Konhauser, K. O. (2012-12)
    Here we explore enrichments in paleomarine Zn as recorded by authigenic iron oxides including Precambrian iron formations, ironstones and Phanerozoic hydrothermal exhalites. This compilation of new and literature-based ...
  • Authigenic uranium in foraminiferal coatings : a proxy for ocean redox chemistry 

    Boiteau, Rene M.; Greaves, Mervyn; Elderfield, Henry (American Geophysical Union, 2012-09-08)
    The rate of uranium accumulation in oceanic sediments from seawater is controlled by bottom water oxygen concentrations and organic carbon fluxes—two parameters that are linked to deep ocean storage of CO2. To investigate ...