Search
Now showing items 71-80 of 86
Little Ice Age climate in the western tropical Atlantic inferred from coral geochemical proxies
(Massachusetts Institute of Technology, 2016)
Paleoclimate archives place the short instrumental record of climate variability in a longer temporal context and allow better understanding of the rate, nature and extent by which anthropogenic warming will impact natural ...
Scavenging and transport of thorium radioisotopes in the North Atlantic Ocean
(Massachusetts Institute of Technology, 2018)
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 to ...
Movements and oceanographic associations of large pelagic fishes in the North Atlantic Ocean
(Massachusetts Institute of Technology, 2018)
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 ...
Submesoscale turbulence in the upper ocean
(Massachusetts Institute of Technology, 2016)
Submesoscale flows, current systems 1-100 km in horizontal extent, are increasingly coming into focus as an important component of upper-ocean dynamics. A range of processes have been proposed to energize submesoscale ...
Exploring the climate change refugia potential of equatorial Pacific coral reefs
(Massachusetts Institute of Technology, 2015)
Global climate models project a 21st century strengthening of the Pacific Equatorial Undercurrent (EUC). The consequent increase in topographic upwelling of cool waters onto equatorial coral reef islands would mitigate ...
Radium isotopes as tracers of boundary inputs of nutrients and trace elements to the coastal and open ocean
(Massachusetts Institute of Technology, 2018)
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 ...
Transformations of mercury in the marine water column
(Massachusetts Institute of Technology, 2014)
Methylation of mercury (Hg) in the marine water column has been hypothesized to serve as the primary source of the bioaccumulating chemical species monomethylmercury (MMHg) to marine food webs. Despite decades of research ...
Structure and mechanics of the subducted Gorda Plate : constrained by afterslip simulations and scattered seismic waves
(Massachusetts Institute of Technology, 2021)
Subduction zones host the greatest earthquakes on earth and pose great threat to human society. The largest slip in megathrust earthquakes often occurs in the 10-50 km depth range, yet seismic imaging of the material ...
The cobalt cycle in the tropical Pacific Ocean
(Massachusetts Institute of Technology, 2017)
Although over a dozen elements are needed to support phytoplankton growth, only a few are considered to be growth-limiting. As the central atom in vitamin B12, cobalt is crucial for metabolism, but its status as a limiting ...
Geophysical and geochemical constraints on the evolution of oceanic lithosphere from formation to subduction
(Massachusetts Institute of Technology, 2017)
This thesis investigates the evolution of the oceanic lithosphere in a broad sense from formation to subduction, in a focused case at the ridge, and in a focused case proximal to subduction. In general, alteration of the ...