Now showing items 1-20 of 926

    • The mineralogy and chemistry of modern shallow-water and deep-sea corals 

      Farfan, Gabriela A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2019-02)
      The architecture of coral reef ecosystems is composed of coral skeletons built from the mineral aragonite (CaCO3). Coral reefs are currently being threatened by ocean acidification (OA), which may lower calcification rates, ...
    • Scavenging and transport of thorium radioisotopes in the North Atlantic Ocean 

      Lerner, Paul (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2018-09)
      Many chemical constituents are removed from the ocean by attachment to settling particles, a process referred to as “scavenging.” Radioisotopes of thorium, a highly particle-reactive element, have been used extensively ...
    • Radium isotopes as tracers of boundary inputs of nutrients and trace elements to the coastal and open ocean 

      Kipp, Lauren (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2018-09)
      Nutrients and trace metals are vital for supporting life in the ocean, but the boundary processes that control the distributions of these elements are poorly constrained. Radium isotopes are well suited to studying inputs ...
    • Biogeochemical and phylogenetic signals of Proterozoic and Phanerozoic microbial metabolisms 

      Gruen, Danielle S. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2018-09)
      Life is ubiquitous in the environment and an important mediator of Earth’s carbon cycle, but quantifying the contribution of microbial biomass and its metabolic fluxes is difficult, especially in spatially and temporally-remote ...
    • Movements and oceanographic associations of large pelagic fishes in the North Atlantic Ocean 

      Braun, Camrin D. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2018-09)
      Highly migratory marine fishes support valuable commercial fisheries worldwide. Yet, many target species have proven difficult to study due to long-distance migrations and regular deep diving. Despite the dominance of ...
    • Demonstration of passive acoustic detection and tracking of unmanned underwater vehicles 

      Railey, Kristen E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2018-06)
      In terms of national security, the advancement of unmanned underwater vehicle (UUV) technology has transformed UUVs from tools for intelligence, surveillance, and reconnaissance and mine countermeasures to autonomous ...
    • Chaotic advection, mixing, and property exchange in three-dimensional ocean eddies and gyres 

      Brett, Genevieve (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2018-06)
      This work investigates how a Lagrangian perspective applies to models of two oceanographic flows: an overturning submesoscale eddy and the Western Alboran Gyre. In the first case, I focus on the importance of diffusion ...
    • Measurements and dynamics of multiple scale bedforms in tidally energetic environments 

      Jones, Katie R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2018-06)
      The presence of superimposed bedforms, where smaller bedforms exist on larger bedforms, is ubiquitous to energetic tidal environments. Due to their wide range in scale, it is difficult to simultaneously observe these ...
    • Carbon and mineral transformations in seafloor serpentinization systems 

      Grozeva, Niya G. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2018-02)
      This thesis examines abiotic processes controlling the transformation and distribution of carbon compounds in seafloor hydrothermal systems hosted in ultramafic rock. These processes have a direct impact on carbon budgets ...
    • Evolutionary conservation and characterization of the metazoan amino acid response 

      Edenius, Maja Lena (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2018-02)
      Signaling pathways that respond to stress and sense nutrient availability are highly conserved throughout eukaryotes. In mammalian cells, these pathways have evolved to regulate immune responses, representing important ...
    • An investigation of basin-scale controls on upper ocean export and remineralization 

      Black, Erin E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2018-02)
      The biological carbon pump (BCP) helps to moderate atmospheric carbon dioxide levels by bringing carbon to the deep ocean, where it can be sequestered on timescales of centuries to millennia. Climate change is predicted ...
    • Water and volatile element accretion to the inner planets 

      Sarafian, Adam (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2018-02)
      This thesis investigates the timing and source(s) of water and volatile elements to the inner solar system by studying the basaltic meteorites angrites and eucrites. In chapters 2 and 3, I present the results from angrite ...
    • The marine biogeochemistry of chromium isotopes 

      Moos, Simone (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2018-02)
      In the ocean, chromium (Cr) is a redox-sensitive trace metal. The reduction of Cr(VI) to Cr(III) occurs in oxygen deficient zones (ODZs), and Cr reduction in general has been identified as a significant Cr isotope ...
    • Multi-modal and inertial sensor solutions for navigation-type factor graphs 

      Fourie, Dehann (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2017-09)
      This thesis presents a sum-product inference algorithm for platform navigation called Multi-modal iSAM (incremental smoothing and mapping). CommonGaussian-only likelihoods are restrictive and require a complex front-end ...
    • Field observations and numerical model simulations of a migrating inlet system 

      Hopkins, Julia (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2017-09)
      Waves, currents, and bathymetric change observed along 11 km of the southern shoreline of Martha’s Vineyard include storm events, strong tidal flows (> 2 m/s), and an inlet migrating 2.5 km in ~7 years. A field-verified ...
    • Influence of meltwater on Greenland Ice Sheet dynamics 

      Stevens, Laura A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2017-09)
      Seasonal fluxes of meltwater control ice-flow processes across the Greenland Ice Sheet ablation zone and subglacial discharge at marine-terminating outlet glaciers. With the increase in annual ice sheet meltwater production ...
    • Trace element proxies and mineral indicators of hydrothermal fluid composition and seafloor massive sulfide deposit formation processes 

      Evans, Guy N. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2017-06)
      This thesis analyzes compositions of seafloor massive sulfide (SMS) deposits and related hydrothermal vent fluids to identify proxies of reaction zone conditions (host-rock lithology, hydrothermal fluid temperature and ...
    • Low frequency active sonar performance in the Arctic Beaufort Lens 

      Carper, Scott A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2017-09)
      A newly discovered double ducted acoustic environment present throughout much of the Beaufort Sea in the Arctic has a major effect on active acoustic transmissions. This work performs an in depth analysis of how the lower ...
    • Age of air and the circulation of the stratosphere 

      Linz, Marianna (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2017-09)
      The circulation of air in the stratosphere is important for the distribution of radiatively important trace gases, such as ozone and water vapor, and other chemical species, including ozone-depleting chlorofluorocarbons. ...
    • MEMS IMU navigation with model based dead-reckoning and one-way-travel-time acoustic range measurements for autonomous underwater vehicles 

      Kepper, James (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2017-09)
      Recent advances in acoustic navigation methodologies are enabling the way for AUVs to extend their submerged mission time and maintain a bounded XY position error. Additionally, advances in inertial sensor technology ...