Fall 2005 Colloquia
Monday, September 12
Professor Simon Brassell, Geological Sciences, IU Bloomington
"Molecular and Isotopic Records of Biogeochemical Processes and Climate Change during the Early Aptian Oceanic Anoxic Event"
Greenhouse conditions in the Cretaceous fueled by elevated atmospheric CO2 are punctuated by perturbations of the global carbon cycle described as 'Oceanic Anoxic Events.' Exceptional sequences of the Early Aptian OAE 1a were recovered from the Pacific during ODP Leg 198 enabling assessment of ocean productivity and tropical climate associated with the first such Cretaceous event. Molecular compositions and nitrogen isotopes provide evidence for nitrogen fixation coupled with elevated cyanobacterial populations attesting to a Cretaceous marine nitrogen cycle different from the modern.
Assessment of sea surface temperatures using the TEX86 proxy reveals discrete cooler intervals that coincide with positive excursions in δ13C of organic matter reflecting changes in carbon cycling induced by enhanced carbon burial. Stratigraphic constraints suggest that the cooler intervals occur on cycles of ˜83-135 kyr, timescales that are consistent with orbital forcing. Temperatures during the Early Aptian cooling interludes are comparable with those in the modern equatorial Pacific sustained by polar ice, suggesting that glaciation episodes and concomitant changes in deep-water circulation and ocean productivity may all be integral to OAE-1a.
Wednesday, September 14 - 12:20 p.m. in GY507 (alternate site could be S201)
Dr. Terry Pavlis, University of New Orleans
Informal Brownbag: "Use of Computers in Field Geology"
While waiting for things down in New Orleans get settled, Dr. Terry Pavlis of the University of New Orleans (and the identical twin of our own Professor Gary Pavlis) has graciously offered to hold an informal discusion on the utilization of field computers while performing research as a structural geologist.
Monday, September 19
Professor Emeritus Haydn Murray, Geological Sciences, IU Bloomington
"Current Industrial Application of Clays"
Wednesday, September 21 - 7:00 p.m. in IU Auditorium
Dr. Eugenie Scott, National Center for Science Education
"The Pillars of Creationism and the Teaching of Evolution"
[lecture website] [lecture flyer]
Thursday, September 22 - 4:00 p.m. in Myers Hall, Room 130
Dr. Eugenie Scott, National Center for Science Education
"Tracking Those Incredible Creationists: Adventures as public Scientist"
Friday, September 30 - 4:00 p.m. in GY126
>Dr. Maria Mastalerz, Indiana Geological Survey
Joint Colloquium Series: "Flip the switch, demand more coal: The environmental challenges from our continued use of fossil fuels"
[IGS lecture flyer]
What? We're still using coal? If so, why, and will we stop soon? These questions will be addressed and serve as the framework for Dr. Mastalerz' presentation about her research on energy-related issues. Dr. Mastalerz will also discuss recent trends in science and technology addressing issues related to coal utilization, such as coal combustion and coal gasification. Finally, she will discuss the status of mercury regulations from coal-fired power plants and what is being done to reduce CO2 emissions.
Tuesday, October 4 - 4:15 p.m. in Woodburn Hall, Room 100
Dr. John Incardone, Northwest Fisheries Science Center, NOAA
Joint Colloquium Series: "Conservation medicine and endangered species: Case studies from the Pacific Northwest"
Recent assessments of coastal habitats worldwide, from tropical reefs to temperate estuaries, have cited land-based pollution or runoff as a major threat to aquatic ecosystem health. A major challenge for the future of conservation biology is addressing this type of large-scale problem in ecosystem degradation. These data gaps are a significant problem for natural resource management, highlighted in the US Pacific Northwest by the lack of knowledge on the impacts of urbanization and population growth on the conservation and recovery of endangered Pacific salmon species, as well as other marine species in decline. To determine cause-effect relationships and understand biological mechanisms underlying health impacts of common pollutants that may ultimately reduce the survival or reproductive success of fish, we are taking an interdisciplinary and integrated approach to the problem of pollution and fish health. Because this approach emphasizes the use of biomedical model systems to address these data gaps, it represents a broader application of the practice of conservation medicine. Our long-term goal is to translate mechanistic insight gained from biomedical model systems into technologies that will support ongoing field investigations monitoring the health and survival of fish in polluted habitats, and thus help manage the conservation and recovery of wild fish species in the Pacific Northwest.
John Incardona is a developmental biologist/toxicologist who has worked on environmental teratogens and gene-environment interactions since 1997. He received a B.S. in Biology from Indiana University (1988), and a Ph.D. in Genetics (1995) and M.D. degree (1996) from Case Western Reserve University. After a Medical Teratology fellowship and post-doctoral work in developmental neurobiology at the University of Washington, he joined the National Oceanic and Atmospheric Administration's Northwest Fisheries Science Center to study the effects of pollution on fish development using the zebrafish model system.
Tuesday, October 18 - 7:00 p.m. in Jordan Hall, Room 124
Professor Michael Hamburger, Geological Sciences, IU Bloomington (as one of the panelists)
India Studies Program Panel Discussion: "Earthquake in South Asia: Explanations and Responses"
The India Studies Program is sponsoring a panel to discuss the earthquake in northern Pakistan and its societal impacts. The panel will include professors Arvind Verma and Sumit Ganguly of the India Studies program, Professor Michael Hamburger of the Department of Geological Sciences, and Rafia Zakaria, a graduate student in the Department of Political Science. The forum will be held at 7 p.m. Tuesday, Oct. 18 in Jordan Hall 124. The event is free and open to the public.
Friday, November 4 - 4:00 p.m. in Student Building, Room SB150
Professor Sue Grimmond, Geography, IU Bloomington
Joint Colloquium Series: "Understanding Urban Climates: Measuring and Modeling Surface-Atmosphere Exchanges"
Approximately half of the world's population (over three billion people) live in urban areas. By 2025, the United Nations predicts that this number will double, and that the proportion of the global population who are urban residents will rise to two-thirds. Land surface and atmospheric alteration by urbanization leads to the development of distinct urban climates that affect conditions both within and beyond the city. Ultimately these urban climate effects are due to differences in the exchanges of heat, mass, and momentum between the city and its pre-existing landscape. Thus understanding, prediction, and mitigation of urban climate effects are intricately tied to knowledge of these surface - atmosphere exchanges in cities.
In this talk, results from measurement and modeling studies conducted in a range of urban areas in North America, Europe and Africa will be used to consider the variability of surface-atmospheric exchanges both within and between cities, and their fundamental controls. The sites selected represent a range of urban surfaces (in terms of structure, cover, fabric and emissions) in different synoptic and climatological settings. Some of the campaigns have been conducted in isolation, focused just on surface energy balance measurements, others are part of larger urban climate or air quality projects (for example, ESCOMPTE; Joint Urban 2003). Specific attention will be directed to the critical importance of scale, siting of instrumentation, integration of GIS/Remote Sensing to model source areas/footprints of sensors, and key surface controls on flux partitioning.
The overall objective of the talk will be to provide a synthesis of current understanding of the surface-atmospheric exchanges both within and between cities, fundamental surface and atmospheric controls, and implications for a broad array of air quality, urban hydrology, carbon dynamics, weather forecasting applications.
Monday, November 7
Dr. Steve Dworkin, Baylor University
"The impact of dust on near-surface geochemical processes"
Dr. Dworkin is investigating the contribution of dust to the geochemistry of surficial waters, soils, and sediments in central Texas, and the origin of that dust.
Tuesday, November 8 - 12:20 p.m. in S201
Dr. Steve Dworkin, Baylor University
Brownbag: "Oxygen isotopes of pedogenic carbonates and paleotemperatures, a discussion"
Thursday, November 10 - 12:20 p.m. in S201
Katherine Neff, B.S. Candidate, Geological Sciences, Indiana University
Brownbag: "Opaque mineral assemblages in CK and CV carbonaceous chondrites and implications for formation history: Internship research at Johnson Space Center"
Friday, November 11 - 1:15 p.m. in GY143
J. Carl Vandivier III, PhD Candidate, Geological Sciences, IU Bloomington
Ph.D. Dissertation Defense: "A Treatise of How to Model Coal Allocation by Optimization"
Chair: Professor Emeritus Haydn Murray