2002 EAPS Lecture Series: Chemical Evolution of the Ocean and Atmosphere from Creation to Pollution
No enrollment limit, no advance sign up
Participants welcome at individual sessions (series)
A series of noontime lectures on various topics designed to define the different connections and components that allow us to think about the earth as a system of connected processes. The lectures in the series with deal with the solid earth and its fluid envelopes, the ocean and atmosphere. A principle focus will be the variation in their chemistries with time. Please see the on-line listing for specific topics and dates.
Contact: Vicki McKenna, 54-910, x3-3380, email@example.com
Sponsor: Earth, Atmos & Planetary Sci
Exploring Earth's Deep Interior with Seismic Wave
Robert van der Hilst
Plate tectonics and many natural hazards are the surface manifestations of a large scale geodynamic process in Earth's interior known as mantle convection. Mantle convection is the primary means for Earth to lose
its heat and the nature and scale of flow are closely related to the evolution of our planet over geological time. I will show how seismic tomography can be used as a gigantic CAT scan to delineate the trajectories of mantle flow in Earth's mantle and discuss the implications for the viability of competing models of mantle convection.
Mon Jan 7, 12-01:15pm, 54-915
Laboratory Demonstration: Atmospheric Chemical Processes
Mario and Luisa Molina
Laboratroy demonstrations and discussion of common phenomena in atmospheric chemistry and physics.
Thu Jan 10, 12-02:00pm, 54-1811, Change in time and location
The Great Oxygen Event (~2.3 byr) of the Atmosphere
Heinrich Holland Harvard University faculty
Fri Jan 11, 12-01:15pm, 54-915
Nutrient Cycles and Biological Productivity in the Oceans
Wed Jan 16, 12-01:15pm, 54-915
A Neoprotoerozoic Snowball Earth
Dan Schrag Harvard Unviersity faculty
Carbon isotope anomalies in carbonate rocks bracketing Neoproterozoic glacial deposits in Namibi suggest that biological productivity in the surface ocean collapsed for millions of years. This collapse can be explained by a global glaciation (that is, a snowball Earth), which ended abruptly when surface volcanic emissions raised atmospheric carbon dioxide to about 350 times the modern level. The rapid termination of the glacial conditions would have resulted in a warming of the snowball Earth to extreme greenhouse conditions. The resulting transfer of atmospheric carbon dioxide to the ocean would result in the rapid precipitation of calcium carbonate in warm surface waters, producing the observed world-wide distribution of carbonate rocks.
Fri Jan 18, 12-01:15pm, 54-915
Evolution of Atmospheric Oxygen over the Phanerozoic
Rober Berner Yale University
Fri Jan 25, 12-01:15pm, 54-915
Pollution of the Present Day Atmosphere: Man-made and Natural Sources of Smog-causing, Ozone-depleting, and Greenhouse Gases
Nicola Blake University of New Hampshire
Mon Jan 28, 12-01:15pm, 54-915
Oxygen, Carbon, and Life through Geologic Time
A Harvard, MIT, WHOI Forum with:
John Hayes, Woods Hole Oceanographic Institiution
Andrew Knoll, Harvard University
Dan Rothman, MIT
Roger Summons, MIT
Fri Feb 1, 11am-12:45pm, 54-915, Note change in time.
Latest update: 08-Jan-2002