Dr. Michael Ram

Photo of Professor Micheal Ram  

Professor Emeritus, Ph.D. Columbia (1965)

Office: 303 Fronczak Hall,  (716) 645-5903
Lab: 340 Fronczak Hall,  (716) 645-6252
Email: phymram@buffalo.edu
link to personal website for more info

Education

  Ph.D. -- Columbia University (1965)
M.S. -- Technion, Israel (1962)
B.S. -- Technion, Israel (1960)

Research Interests

 
  • Measurements and analysis of solar cycle modulations in the GISP2 ice core dust profile
  • Analysis of evidence of severe dust storms seen in ice age Greenland ice

  My research efforts in recent years have mainly been involved in getting information on past climates and climate change. As a principle investigator in the National Science Foundation's Greenland Ice Sheet Project 2 (GISP2) initiative, I developed laser-light scattering (LLS) techniques to measure the dust profile along the length of the 3000plus-meters-long GISP2 ice core that was retrieved from central Greenland. Since the dust in the ice is believed to be representative of past atmospheric dust burdens, our measurements reflect how past atmospheric dust burdens changed over the past 100,000-plus years. This information is of critical importance in climate modeling since atmospheric dust can absorb and scatter solar energy, and can thus modify the earth's albedo. Since it is known that dust concentration in the core varies seasonally with maxima occurring every spring/summer, our work has been of critical importance in dating the GISP2 ice core. In addition, our work is yielding important information on violent dust storms that seem to have been prevalent during cold glacial times. Also, we observed that the dust concentration along the ice core was modulated with 11-, 20-, 90-, and 200-year periods, which we attribute to the solar cycle. These modulations occur throughout the core, and we observe them all the way back to 100,000 years BP. We have suggested that the dust modulations are a consequence of solar modulation of the terrestrial cosmic ray flux, which can influence cloud cover. FIG. 1 Dust profile of GISP2 ice core observed using laser- light scattering (LLS) from ice. For comparison, we also show the oxygen isotope profile. Colder periods, corresponding to more negative oxygen isotope ratios, go hand-in-hand with periods of higher dust concentration, which is consistent with the idea that the weather was significantly stormier during the colder periods of the last ice age.

Selected Publications

  1. "Possible solar influences on the dust profile of the GISP2 ice core from central Greenland", M. Ram, with M. Stolz, Geophys. Res. Lett. 26(8), 1043-46 (1999).
  2. "Continuous dust concentration profile of pre-Holocene ice from the GISP2 ice core: Dust stadials, interstadials, and the Eemian", M. Ram, with G. Koenig, Jour. Geophys. Res., special GISP2/GRIP issue 102 C12, 26 641-8 (1997).
  3. "Eleven-year cycle of dust concentration variability observed in the dust profile of the GISP2 ice core from central Greenland: Possible solar cycle connection", M. Ram, with M. Stolz and G. Koenig, Geophys. Res. Lett. 24 19, 2359-62 (1997).
  4. "Volcanic ash from Icelandic ~57,300 year BP eruption found in GISP2 (Greenland) ice core", M. Ram, with J. Donarummo and M. Sheridan, Geophys. Res. Lett. 23 22, 3167-9 (1996).
  5. "Insoluble particles in polar ice: Identification and measurement of the insoluble background aerosol", M. Ram, with R. I. Gayley, Geophys. Res. Lett. 21 6, 437-40 (1994).