Now showing items 21-40 of 876

    • Animating the carbon cycle 

      Schmitz, Oswald J.; Raymond, Peter A.; Estes, James A.; Kurz, Werner A.; Holtgrieve, Gordon W.; Ritchie, Mark E.; Schindler, Daniel E.; Spivak, Amanda C.; Wilson, Rod W.; Bradford, Mark A.; Christensen, Villy; Deegan, Linda A.; Smetacek, Victor; Vanni, Michael J.; Wilmers, Christopher C. (2013-08)
      Understanding the biogeochemical processes regulating carbon cycling is central to mitigating atmospheric CO2 emissions. The role of living organisms has been accounted for, but the focus has traditionally been on ...
    • The annual cycle of gross primary production, net community production, and export efficiency across the North Pacific Ocean 

      Palevsky, Hilary I.; Quay, Paul D.; Lockwood, Deirdre E.; Nicholson, David P. (John Wiley & Sons, 2016-02-27)
      We measured triple oxygen isotopes and oxygen/argon dissolved gas ratios as nonincubation-based geochemical tracers of gross oxygen production (GOP) and net community production (NCP) on 16 container ship transects across ...
    • Annual cycles of ecological disturbance and recovery underlying the subarctic Atlantic spring plankton bloom 

      Behrenfeld, Michael J.; Doney, Scott C.; Lima, Ivan D.; Boss, Emmanuel S.; Siegel, David A. (John Wiley & Sons, 2013-06-20)
      Satellite measurements allow global assessments of phytoplankton concentrations and, from observed temporal changes in biomass, direct access to net biomass accumulation rates (r). For the subarctic Atlantic basin, analysis ...
    • Anthropogenic ocean acidification over the twenty-first century and its impact on calcifying organisms 

      Orr, James C.; Fabry, Victoria J.; Aumont, Olivier; Bopp, Laurent; Doney, Scott C.; Feely, Richard A.; Gnanadesikan, Anand; Gruber, Nicolas; Ishida, Akio; Joos, Fortunat; Key, Robert M.; Lindsay, Keith; Maier-Reimer, Ernst; Matear, Richard J.; Monfray, Patrick; Mouchet, Anne; Najjar, Raymond G.; Plattner, Gian-Kasper; Rodgers, Keith B.; Sabine, Christopher L.; Sarmiento, Jorge L.; Schlitzer, Reiner; Slater, Richard D.; Totterdell, Ian J.; Weirig, Marie-France; Yamanaka, Yasuhiro; Yool, Andrew (2005-07-29)
      The surface ocean is everywhere saturated with respect to calcium carbonate (CaCO3). Yet increasing atmospheric CO2 reduces ocean pH and carbonate ion concentrations [CO32−] and thus the level of saturation. Reduced ...
    • 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 F.; 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 R.; 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, Peter; Lefevre, N.; Manizza, Manfredi; Mathis, Jeremy T.; Metzl, Nicolas; Olsen, Are; 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. ...