Now showing items 3270-3289 of 5607

    • N-loss isotope effects in the Peru oxygen minimum zone studied using a mesoscale eddy as a natural tracer experiment 

      Bourbonnais, Annie; Altabet, Mark A.; Charoenpong, Chawalit N.; Larkum, Jennifer; Hu, Haibei; Bange, Hermann W.; Stramma, Lothar (John Wiley & Sons, 2015-06-06)
      Mesoscale eddies in Oxygen Minimum Zones (OMZs) have been identified as important fixed nitrogen (N) loss hotspots that may significantly impact both the global rate of N-loss as well as the ocean's N isotope budget. They ...
    • N2 fixation by subsurface populations of Trichodesmium : an important source of new nitrogen to the North Atlantic Ocean 

      Heithoff, Abigail (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2011-02)
      Trichodesmium, a genus of diazotrophic cyanobacteria, is an important contributor to the marine nitrogen (N) and carbon (C) cycles. The extent to which Trichodesmium dinitrogen (N2) fixation contributes to the marine N ...
    • N2 fixation in eddies of the eastern tropical South Pacific Ocean 

      Löscher, Carolin; Bourbonnais, Annie; Dekaezemacker, Julien; Charoenpong, Chawalit; Altabet, Mark; Bange, Hermann; Czeschel, Rena; Hoffmann, Chris; Schmitz, Ruth (Copernicus Publications on behalf of the European Geosciences Union, 2016-05-18)
      Mesoscale eddies play a major role in controlling ocean biogeochemistry. By impacting nutrient availability and water column ventilation, they are of critical importance for oceanic primary production. In the eastern ...
    • The N456 Navigator system 

      Abrams, Lane J. (Woods Hole Oceanographic Institution, 2009-01)
      The N456 Navigator has been developed to assist in Long Baseline (LBL) acoustic navigation. Its two basic functions are generation of acoustic signals, and receipt and timing of returns. When combined with the new dsnav ...
    • Nansen-bottle stations at the Woods Hole Oceanographic Institution 

      Warren, Bruce A. (2007-09-28)
      Nansen-bottle stations were occupied by ships and personnel of the Woods Hole Oceanographic Institution from 1931 to about 1981. Most of these data are in archives, but using them intelligently to depict the state of the ...
    • Narrative of Chain cruise #43 : February - August 1964 

      Knott, Sydney T.; Bunce, Elizabeth T.; Bowin, Carl O.; Hersey, J. B.; Chase, R. L. (Woods Hole Oceanographic Institution, 1965-02)
      On CHAIN Cruise 43, 15 February to 21 August 1964, geophysical and geological observations were made in the North Atlantic Ocean, the Mediterranean and Red Seas, and the Western part of the Indian Ocean, along the track ...
    • Narratives can motivate environmental action : the Whiskey Creek ocean acidification story 

      Kelly, Ryan P.; Cooley, Sarah R.; Klinger, Terrie (2014-04)
      Even when environmental data quantify the risks and benefits of delayed responses to rapid anthropogenic change, institutions rarely respond promptly. We propose that narratives complementing environmental datasets can ...
    • Natural 14C in Saccoglossus bromophenolosus compared to 14C in surrounding sediments 

      Teuten, Emma L.; King, Gary M.; Reddy, Christopher M. (Inter-Research, 2006-10-23)
      The natural radiocarbon (14C) content of whole, gut voided Saccoglossus bromophenolosus collected in Lowes Cove, Maine, USA, was compared with that of a non-voided worm, sectioned individuals, and the natural product ...
    • Natural and synthetic estrogens in wastewater treatment plant effluent and the coastal ocean 

      Griffith, David R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2013-09)
      Steroidal estrogens are potent endocrine disrupting chemicals that are naturally excreted by vertebrates (e.g., humans and fish) and can enter natural waters through the discharge of treated and raw sewage. Because ...
    • Natural and unnatural oil slicks in the Gulf of Mexico 

      MacDonald, Ian R.; Garcia-Pineda, Oscar; Beet, Andrew R.; Daneshgar Asl, Samira; Feng, Lian; Graettinger, George D.; French-McCay, Deborah P.; Holmes, James; Hu, Chuanmin; Huffer, Fred W.; Leifer, Ira; Muller-Karger, Frank E.; Solow, Andrew R.; Silva, M.; Swayze, Gregg A. (John Wiley & Sons, 2015-12-28)
      When wind speeds are 2–10 m s−1, reflective contrasts in the ocean surface make oil slicks visible to synthetic aperture radar (SAR) under all sky conditions. Neural network analysis of satellite SAR images quantified the ...
    • A natural history of the deep-sea aplacophoran Prochaetoderma yongei and its relationship to confamilials (Mollusca, Prochaetodermatidae) 

      Scheltema, Amelie H.; Ivanov, Dmitry L. (2008-11-10)
      Previously published studies are woven together into a natural history of a deep-sea aplacophoran mollusc species, Prochaetoderma yongei Scheltema, 1985, and its confamilial species in the Prochaetodermatidae. This ...
    • Natural iron enrichment around the Antarctic Peninsula in the Southern Ocean 

      Ardelan, M. V.; Holm-Hansen, O.; Hewes, C. D.; Reiss, Christian S.; Silva, N. S.; Dulaiova, Henrieta; Steinnes, E.; Sakshaug, E. (Copernicus Publications on behalf of the European Geosciences Union, 2010-01-05)
      As part of the US-AMLR program in January-February of 2006, 99 stations in the South Shetland Islands-Antarctic Peninsula region were sampled to understand the variability in hydrographic and biological properties related ...
    • Natural organobromine in marine sediments : new evidence of biogeochemical Br cycling 

      Leri, Alessandra C.; Hakala, J. Alexandra; Marcus, Matthew A.; Lanzirotti, Antonio; Reddy, Christopher M.; Myneni, Satish C. B. (American Geophysical Union, 2010-11-24)
      Organobromine (Brorg) compounds, commonly recognized as persistent, toxic anthropogenic pollutants, are also produced naturally in terrestrial and marine systems. Several enzymatic and abiotic bromination mechanisms have ...
    • Natural selection, microevolution and macroevolution 

      Hulburt, Edward M. (2007-06-11)
      The use of logical validity and empirical data will show that natural selection occurs at the micro-evolutionary level but does not occur at the macro-evolutionary level.
    • Natural variability and anthropogenic trends in oceanic oxygen in a coupled carbon cycle–climate model ensemble 

      Frolicher, T. L.; Joos, Fortunat; Plattner, Gian-Kasper; Steinacher, M.; Doney, Scott C. (American Geophysical Union, 2009-02-13)
      Internal and externally forced variability in oceanic oxygen (O2) are investigated on different spatiotemporal scales using a six-member ensemble from the National Center for Atmospheric Research CSM1.4-carbon coupled ...
    • Natural variability in a stable, 1000-yr global coupled climate-carbon cycle simulation 

      Doney, Scott C.; Lindsay, Keith; Fung, Inez Y.; John, Jasmin G. (American Meteorological Society, 2006-07-01)
      A new 3D global coupled carbon–climate model is presented in the framework of the Community Climate System Model (CSM-1.4). The biogeochemical module includes explicit land water–carbon coupling, dynamic carbon allocation ...
    • Natural-abundance radiocarbon as a tracer of assimilation of petroleum carbon by bacteria in salt marsh sediments 

      Wakeham, Stuart G.; McNichol, Ann P.; Kostka, Joel E.; Pease, Tamara K. (2005-12-29)
      The natural abundance of radiocarbon (14C) provides unique insight into the source and cycling of sedimentary organic matter. Radiocarbon analysis of bacterial phospholipid lipid fatty acids (PLFAs) in salt-marsh sediments ...
    • The nature and origin of fine-scale sea-floor relief 

      Shih, John Shai-Fu (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1979-12)
      Bathymetric profiles of mid-ocean ridges show that the morphology of ridge crests and the roughness of sea-floor relief created there is commonly related to the spreading rate. To study the creation of fine-scale sea-floor ...
    • Nature of the Jurassic Magnetic Quiet Zone 

      Tominaga, Masako; Tivey, Maurice A.; Sager, William W. (John Wiley & Sons, 2015-10-24)
      The nature of the Jurassic Quiet Zone (JQZ), a region of low-amplitude oceanic magnetic anomalies, has been a long-standing debate with implications for the history and behavior of the Earth's geomagnetic field and plate ...
    • Nature, origin, transport and deposition of andosol parent material in south-central Chile (36-42°S) 

      Bertrand, Sebastien; Fagel, Nathalie (2007-07)
      The andosols of south-central Chile (36-42°S) are developed on yellow-brown loams that cover the region with a thickness of several meters. In the literature, several hypotheses concerning the nature, origin, mode of ...