Now showing items 3209-3228 of 5320

    • Niche of harmful alga Aureococcus anophagefferens revealed through ecogenomics 

      Gobler, Christopher J.; Berry, Dianna L.; Dyhrman, Sonya T.; Wilhelm, Steven W.; Salamov, Asaf; Lobanov, Alexei V.; Zhang, Yan; Collier, Jackie L.; Wurch, Louie L.; Kustka, Adam B.; Dill, Brian D.; Shah, Manesh; VerBerkmoes, Nathan C.; Kuo, Alan J.; Terry, Astrid; Pangilinan, Jasmyn; Lindquist, Erika A.; Lucas, Susan; Paulsen, Ian T.; Hattenrath-Lehmann, Theresa K.; Talmage, Stephanie C.; Walker, Elyse A.; Koch, Florian; Burson, Amanda M.; Marcoval, Maria Alejandra; Tang, Ying-Zhong; LeCleir, Gary R.; Coyne, Kathryn J.; Berg, Gry M.; Bertrand, Erin M.; Saito, Mak A.; Gladyshev, Vadim N.; Grigoriev, Igor V. (2011-01)
      Harmful algal blooms (HABs) cause significant economic and ecological damage worldwide. Despite considerable efforts, a comprehensive understanding of the factors that promote these blooms has been lacking because the ...
    • Nitrogen cycling in oxygen deficient zones : insights from δ15N and δ18O of nitrite and nitrate 

      Buchwald, Carolyn (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2013-02)
      The stable isotopes, δ15N and δ18O, of nitrite and nitrate can be powerful tools used to interpret nitrogen cycling in the ocean. In order to interpret isotope profiles, the isotope systematics of each process involved ...
    • Nitrogen cycling in the deep sedimentary biosphere : nitrate isotopes in porewaters underlying the oligotrophic North Atlantic 

      Wankel, Scott D.; Buchwald, Carolyn; Ziebis, Wiebke; Wenk, Christine B.; Lehmann, Moritz F. (Copernicus Publications on behalf of the European Geosciences Union, 2015-12-21)
      Nitrogen (N) is a key component of fundamental biomolecules. Hence, its cycling and availability are central factors governing the extent of ecosystems across the Earth. In the organic-lean sediment porewaters underlying ...
    • Nitrogen cycling in the secondary nitrite maximum of the eastern tropical North Pacific off Costa Rica 

      Buchwald, Carolyn; Santoro, Alyson E.; Stanley, Rachel H. R.; Casciotti, Karen L. (John Wiley & Sons, 2015-12-15)
      Nitrite is a central intermediate in the marine nitrogen cycle and represents a critical juncture where nitrogen can be reduced to the less bioavailable N2 gas or oxidized to nitrate and retained in a more bioavailable ...
    • Nitrogen fixation in the South Atlantic Gyre and the Benguela Upwelling System 

      Sohm, Jill A.; Hilton, Jason A.; Noble, Abigail E.; Zehr, Jonathan P.; Saito, Mak A.; Webb, Eric A. (American Geophysical Union, 2011-08-27)
      Dinitrogen (N2) fixation is recognized as an important input of new nitrogen (N) to the open ocean gyres, contributing to the export of organic matter from surface waters. However, very little N2-fixation research has ...
    • Nitrogen isotopes in chlorophyll and the origin of Eastern Mediterranean sapropels 

      Sachs, Julian P. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1997-02)
      The goals of this thesis were: (1) to establish methods for the determination of nitrogen and carbon isotope ratios in marine particulate and sedimentary chlorophyll derivatives; (2) to establish chlorophyll δ15N and ...
    • No. 2 fuel oil compound retention and release by Mytilus edulis : 1983 Cape Cod Canal oil spill 

      Farrington, John W.; Xiaoping, Jia; Clifford, C. Hovey; Tripp, Bruce W.; Livramento, Joaquim B.; Davis, Alan C.; Frew, Nelson M.; Johnson, Carl G. (Woods Hole Oceanographic Institution, 1986-03)
      Retention and release of No. 2 fuel oil compounds by Mytilus edulis contaminated by a small oil spill in the Cape Cod Canal in 1983 has been studied for the population "in situ" and for a subsample transplanted to a ...
    • Noble gas constraints on air-sea gas exchange and bubble fluxes 

      Stanley, Rachel H. R.; Jenkins, William J.; Lott, Dempsey E.; Doney, Scott C. (American Geophysical Union, 2009-11-19)
      Air-sea gas exchange is an important part of the biogeochemical cycles of many climatically and biologically relevant gases including CO2, O2, dimethyl sulfide and CH4. Here we use a three year observational time series ...
    • Noble gas signatures in Greenland : tracing glacial meltwater sources 

      Niu, Yi; Castro, M. Clara; Aciego, Sarah M.; Hall, Chris M.; Stevenson, Emily I.; Arendt, Carli A.; Das, Sarah B. (John Wiley & Sons, 2015-11-06)
      This study represents the first comprehensive noble gas study in glacial meltwater from the Greenland Ice Sheet. It shows that most samples are in disequilibrium with surface collection conditions. A preliminary Ne and Xe ...
    • Noble gas signatures of abyssal gabbros and peridotites at an Indian Ocean core complex 

      Kumagai, Hidenori; Dick, Henry J. B.; Kaneoka, Ichiro (American Geophysical Union, 2003-12-30)
      We report some of the first noble gas data for in situ lower oceanic crust and shallow mantle. From a suite of gabbros and peridotites recovered from the Atlantis Bank oceanic core complex on the Southwest Indian Ridge, ...
    • Noise level correlates with manatee use of foraging habitats 

      Miksis-Olds, Jennifer L.; Donaghay, Percy L.; Miller, James H.; Tyack, Peter L.; Nystuen, Jeffrey A. (Acoustical Society of America, 2007-05)
      The introduction of anthropogenic sound to coastal waters is a negative side effect of population growth. As noise from boats, marine construction, and coastal dredging increases, environmental and behavioral monitoring ...
    • Non-linear dynamic intertwining of rods with self-contact 

      Goyal, Sachin; Perkins, N. C.; Lee, Christopher L. (2007-10)
      Twisted marine cables on the sea floor can form highly contorted three-dimensional loops that resemble tangles. Such tangles or ‘hockles’ are topologically equivalent to the plectomenes that form in supercoiled DNA ...
    • Non-Rayleigh acoustic scattering characteristics of individual fish and zooplankton 

      Stanton, Timothy K.; Chu, Dezhang; Reeder, D. Benjamin (IEEE, 2004-04)
      It has long been known that the statistical properties of acoustic echoes from individual fish can have non-Rayleigh characteristics. The statistical properties of echoes from zooplankton are generally less understood. In ...
    • Non-Rayleigh scattering by a randomly oriented elongated scatterer 

      Bhatia, Saurav (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2012-08)
      The echo statistics of a randomly rough, randomly oriented prolate spheroid that is randomly located in a beampattern are investigated from physics-based principles both analytically and by Monte Carlo methods. This is ...
    • Nonequilibrium clumped isotope signals in microbial methane 

      Wang, David T.; Gruen, Danielle S.; Lollar, Barbara Sherwood; Hinrichs, Kai-Uwe; Stewart, Lucy C.; Holden, James F.; Hristov, Alexander N.; Pohlman, John W.; Morrill, Penny L.; Konneke, Martin; Delwiche, Kyle B.; Reeves, Eoghan P.; Sutcliffe, Chelsea N.; Ritter, Daniel J.; Seewald, Jeffrey S.; McIntosh, Jennifer C.; Hemond, Harold F.; Kubo, Michael D.; Cardace, Dawn; Hoehler, Tori M.; Ono, Shuhei (2015-02-09)
      Methane is a key component in the global carbon cycle with a wide range of anthropogenic and natural sources. Although isotopic compositions of methane have traditionally aided source identification, the abundance of its ...
    • Nonhomogeneous seawater Sr isotopic composition in the coastal oceans : a novel tool for tracing water masses and submarine groundwater discharge 

      Huang, Kuo-Fang; You, Chen-Feng; Chung, Chuan-Hsiung; Lin, In-Tian (American Geophysical Union, 2011-05-07)
      Here we present high-precision (2σ = ±3 ppm) 87Sr/86Sr measurements in coastal waters, together with salinity, to evaluate water mass mixing and the influence of submarine groundwater discharge (SGD) in coastal waters and ...
    • A nonhydrostatic version of FVCOM : 1. Validation experiments 

      Lai, Zhigang; Chen, Changsheng; Cowles, Geoffrey W.; Beardsley, Robert C. (American Geophysical Union, 2010-11-13)
      The unstructured grid finite volume coastal ocean model (FVCOM) system has been expanded to include nonhydrostatic dynamics. This addition uses the factional step method with both split mode explicit and semi-implicit ...
    • A nonhydrostatic version of FVCOM : 2. Mechanistic study of tidally generated nonlinear internal waves in Massachusetts Bay 

      Lai, Zhigang; Chen, Changsheng; Cowles, Geoffrey W.; Beardsley, Robert C. (American Geophysical Union, 2010-12-21)
      The generation, propagation, and dissipation processes of large-amplitude nonlinear internal waves in Massachusetts Bay during the stratified season were examined using the nonhydrostatic Finite-Volume Coastal Ocean Model ...
    • Nonlinear adjustment of a localized layer of buoyant, uniform potential vorticity fluid against a vertical wall 

      Helfrich, Karl R. (2006-01-29)
      The nonlinear evolution of a localized layer of buoyant, uniform potential vorticity fluid of uniform depth H, width w0 and length L released adjacent to a wall in a rotating system is studied using reduced-gravity ...
    • Nonlinear disintegration of the internal tide 

      Helfrich, Karl R.; Grimshaw, Roger H. J. (American Meteorological Society, 2008-03)
      The disintegration of a first-mode internal tide into shorter solitary-like waves is considered. Since observations frequently show both tides and waves with amplitudes beyond the restrictions of weakly nonlinear theory, ...