Browsing FAS Scholarly Articles by Keyword "Geophysics"

Now showing items 1-6 of 6

    • Improved aerosol radiative properties as a foundation for solar geoengineering risk assessment 

      Dykema, J. A.; Keutsch, F. N. (American Geophysical Union (AGU), 2016-07-28)
      Side effects resulting from the deliberate injection of sulfate aerosols intended to partially offset climate change have motivated the investigation of alternatives, including solid aerosol materials. Sulfate aerosols ...

    • Micrometer‐scale Magnetic Imaging of Geological Samples Using a Quantum Diamond Microscope 

      Glenn, D. R.; Fung, Raymond; Kehayias, Pauli; Le Sage, David; Lima, E; Weiss, B; Walsworth, Ronald (American Geophysical Union (AGU), 2017-08)
      Remanent magnetization in geological samples may record the past intensity and direction of planetary magnetic fields. Traditionally, this magnetization is analyzed through measurements of the net magnetic moment of bulk ...

    • Nacre Tablet Thickness Records Formation Temperature in Modern and Fossil Shells 

      Gilbert, Pupa; Bergmann, Kristin; Myers, Corinne E.; Marcus, Matthew; DeVol, Ross; Sun, Chang-Yu; Blonsky, Adam; Tamre, Erik; Zhao, Jessica; Karan, Elizabeth; Tamura, Nobumichi; Lemer, Sarah; Giuffre, Anthony; Giribet, Gonzalo; Eiler, John; Knoll, Andrew (Elsevier BV, 2017-02-15)
      Nacre, the iridescent outer lining of pearls and inner lining of many mollusk shells, is composed of periodic, parallel, organic sheets alternating with aragonite (CaCO3) tablet layers. Nacre tablet thickness (TT) generates ...

    • The nitrogen dayglow on Mars 

      Fox, J. L.; Dalgarno, Alexander; Constantinides, E. R.; Victor, G. A. (American Geophysical Union (AGU), 1977-04-01)
      The ultraviolet dayglow spectrum arising from emission of N2 in the Mars atmosphere is predicted. The intensities are such that a high-resolution spectrum should readily reveal the presence of N2 at the abundances suggested ...

    • Uncovering the Neoproterozoic Carbon Cycle 

      Johnston, David T; Macdonald, Francis Alexander; Gill, B; Hoffman, Paul; Schrag, Daniel P. (Nature Publishing Group, 2012)
      Interpretations of major climatic and biological events in Earth history are, in large part, derived from the stable carbon isotope records of carbonate rocks and sedimentary organic matter1,2. Neoproterozoic carbonate ...

    • The vibrational distribution of N 2 + in the terrestrial ionosphere 

      Fox, J. L.; Dalgarno, Alexander (American Geophysical Union (AGU), 1985-08-01)
      The densities and vibrational distributions of N2+ in the X²Σg+, A²Πu, and B²Σu+ states in the daytime terrestrial ionosphere are computed for both low and high solar activity. Altitude profiles of the relative populations ...