Now showing items 1940-1959 of 6296

    • Evolution of anthropogenic Pb and Pb isotopes in the deep North Atlantic Ocean and the Indian Ocean 

      Lee, Jong-Mi (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2013-06)
      Pb and Pb isotopes in the ocean have varied on decadal to centennial time scales due to anthropogenic Pb inputs. Thus, tracing the temporal variation of Pb and Pb isotopes in the ocean provides information on the major ...
    • Evolution of carbon sinks in a changing climate 

      Fung, Inez Y.; Doney, Scott C.; Lindsay, Keith; John, Jasmin G. (2005-06-13)
      Climate change is expected to influence the capacities of the land and oceans to act as repositories for anthropogenic CO2 and hence provide a feedback to climate change. A series of experiments with the National Center ...
    • The evolution of lithospheric deformation and crustal structure from continental margins to oceanic spreading centers 

      Behn, Mark D. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2002-06)
      This thesis investigates the evolution of lithospheric deformation and crustal structure from continental margins to mid-ocean ridges. The first part (Ch. 2) examines the style of segmentation along the U.S. East Coast ...
    • Evolution of oceanic gabbros : in-situ and ancient examples 

      Kvassnes, Astri Jæger Sweetman (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2004-06)
      This study is a geochemical investigation into the accretion of lower oceanic crust and processes of shallow melt-rock reaction at mid-ocean ridges. Major-, trace-elements, and isotopes from whole-rocks and minerals from ...
    • Evolution of oceanic margins : rifting in the Gulf of California and sediment diapirism and mantle hydration during subduction 

      Miller, Nathamiel C. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2013-06)
      This thesis investigates three processes that control the evolution of oceanic margins. Chapter 2 presents seismic images of a ~2-km-thick evaporite body in Guaymas Basin, central Gulf of California. In rifts, evaporites ...
    • Evolution of olivine lattice preferred orientation during simple shear in the mantle 

      Warren, Jessica M.; Hirth, Greg; Kelemen, Peter B. (2008-04-03)
      Understanding the variation of olivine lattice preferred orientation (LPO) as a function of shear strain is important for models that relate seismic anisotropy to the kinematics of deformation. We present results on the ...
    • Evolution of seismic layer 2B across the Juan de Fuca Ridge from hydrophone streamer 2-D traveltime tomography 

      Newman, Kori R.; Nedimovic, Mladen R.; Canales, J. Pablo; Carbotte, Suzanne M. (American Geophysical Union, 2011-05-17)
      How oceanic crust evolves has important implications for understanding both subduction earthquake hazards and energy and mass exchange between the Earth's interior and the oceans. Although considerable work has been done ...
    • The evolution of silicon transporters in diatoms 

      Durkin, Colleen A.; Koester, Julie; Bender, Sara J.; Armbrust, E. Virginia (John Wiley & Sons, 2016-08-31)
      Diatoms are highly productive single-celled algae that form an intricately patterned silica cell wall after every cell division. They take up and utilize silicic acid from seawater via silicon transporter (SIT) proteins. ...
    • Evolution of the East Greenland Current from Fram Strait to Denmark Strait : synoptic measurements from summer 2012 

      Håvik, Lisbeth; Pickart, Robert S.; Våge, Kjetil; Torres, Daniel J.; Thurnherr, Andreas M.; Beszczynska-Möller, Agnieszka; Walczowski, Waldemar; von Appen, Wilken-Jon (John Wiley & Sons, 2017-03-13)
      We present measurements from two shipboard surveys conducted in summer 2012 that sampled the rim current system around the Nordic Seas from Fram Strait to Denmark Strait. The data reveal that, along a portion of the ...
    • Evolution of the eddy field in the Arctic Ocean's Canada Basin, 2005–2015 

      Zhao, Mengnan; Timmermans, Mary-Louise; Cole, Sylvia T.; Krishfield, Richard A.; Toole, John M. (John Wiley & Sons, 2016-08-03)
      The eddy field across the Arctic Ocean's Canada Basin is analyzed using Ice-Tethered Profiler (ITP) and moored measurements of temperature, salinity, and velocity spanning 2005 to 2015. ITPs encountered 243 eddies, 98% of ...
    • The evolution of the Indian Ocean triple junction and the finite rotation problem 

      Tapscott, Christopher Robert (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1979-06)
      A major goal in the study of plate tectonics is the acquisition of a knowledge of the history of relative motion among the rigid plates of the earth's lithosphere. The three papers of this thesis contribute to this effort ...
    • Evolution of the Irminger Current anticyclones in the Labrador Sea from hydrographic data 

      Rykova, Tatiana A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-06)
      The continuous supply of heat and fresh water from the boundaries to the interior of the Labrador Sea plays an important role for the dynamics of the region and in particular, for the Labrador Sea Water formation. Thus, ...
    • Evolution of the south Pacific helium plume over the past three decades 

      Lupton, John E.; Jenkins, William J. (John Wiley & Sons, 2017-05-04)
      The recent GEOTRACES Eastern Pacific Zonal Transect in 2013 crossed the East Pacific Rise at 15°S following the same track as the 1987 Helios Expedition along the core of the mid-depth helium plume that spreads westward ...
    • Evolution of the Southwest Indian Ridge from 55°45′E to 62°E : changes in plate-boundary geometry since 26 Ma 

      Baines, A. Graham; Cheadle, Michael J.; Dick, Henry J. B.; Scheirer, Allegra Hosford; John, Barbara E.; Kusznir, Nick J.; Matsumoto, Takeshi (American Geophysical Union, 2007-06-23)
      From 55°45′E to 58°45′E and from 60°30′E to 62°00′E, the ultraslow-spreading Southwest Indian Ridge (SWIR) consists of magmatic spreading segments separated by oblique amagmatic spreading segments, transform faults, and ...
    • The evolution of upper ocean thermal structure at 10°N, 125°W during 1997-1998 

      Farrar, J. Thomas (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2003-09)
      In this thesis I have endeavored to determine the factors and physical processes that controlled SST and thermocline depth at 10°N, 125°W during the Pan American Climate Study (PACS) field program. Analysis based on the ...
    • Evolution of volcanism and faulting in a segment of the Mid-Atlantic Ridge at 25°N 

      Cann, Johnson R.; Smith, Deborah K. (American Geophysical Union, 2005-09-09)
      We reconstruct the volcanic and tectonic evolution over the last 250,000 years of the median valley floor in the spreading segment of the Mid-Atlantic Ridge centered at 25°N. In the center of the segment, multibeam bathymetry ...
    • Evolutionary and ecological genomics in deep-sea organisms 

      Herrera Monroy, Santiago (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2015-02)
      Hydrothermal vents and coral ecosystems are conspicuous biological hotspots in the deep-sea. These ecosystems face increasing threats from human activities. Having thorough taxonomic inventories as well as understanding ...
    • Evolutionary demography of structured two-sex populations and sex ratios 

      Shyu, Esther (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2015-09)
      Males and females may differ in stage-specific survival, maturation, fertility, or mating availability. These demographic differences, in turn, affect population growth rates, equilibrium structure, and evolutionary ...
    • Evolutionary origins of the estrogen signaling system : insights from amphioxus 

      Callard, Gloria V.; Tarrant, Ann M.; Novillo, A.; Yacci, P.; Ciaccia, L.; Vajda, S.; Chuang, G.-Y.; Kozakov, D.; Greytak, S. R.; Sawyer, S.; Hoover, Cindi A.; Cotter, K. A. (2011-04-06)
      Classically, the estrogen signaling system has two core components: cytochrome P450 aromatase (CYP19), the enzyme complex that catalyzes the rate limiting step in estrogen biosynthesis; and estrogen receptors (ERs), ...
    • Evolutionary patterns within the Anthozoa (phylum Cindaria) reflected in ribosomal gene sequences 

      Berntson, Ewann A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-04)
      This thesis project assesses phylogenetic relationships within the phylum Cnidaria, at the subclass level within the Class Anthozoa, and at the ordinal level within the Subclass Octocorallia. Traditional cladistics using ...