Events
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JSG | BEG | UTIG | EPS |
DeFord Lecture: Claudio Faccenna
Start:March 1, 2018 at 4:00 pm
End:
March 1, 2018 at 5:00 pm
Location:
JGB 2.324
UTIG Seminar Series: Piyoosh Jaysaval, UTIG
Start:March 2, 2018 at 10:30 am
End:
March 2, 2018 at 11:30 am
Location:
PRC ROC Room 1.603
Contact:
Anisa Abdulkader, aabdulkader@ig.utexas.edu, 512-471-0417
Title: Hydrocarbon exploration using controlled-source electromagnetic method: from introduction to advances in modeling/inversion
Abstract: Marine controlled-source electromagnetic (CSEM) surveying is now an important technique for petroleum exploration. The technique uses a strong electric current source to probe subsurface resistivities and has proven to be very useful for detecting resistive petroleum reservoirs. In this technique, the data are recorded in the form of electric and magnetic fields, which must be inverted to obtain an image of the subsurface resistivity distribution.
To recover a geologically consistent resistivity image of subsurface, CSEM inversion algorithms usually require a significantly large number of forward simulation of CSEM responses over different resistivity models. Therefore, having a fast and accurate forward modeling scheme is a key ingredient for a reliable inversion and interpretation of the recorded CSEM data.
In this talk, I will present an introduction of CSEM method and its application for petroleum exploration. Thereafter, I will present two novel forward modeling approaches: (1) a Schur complement based fast multimodel finite-difference (FD) modeling scheme developed to reduce total modeling time in a constrained inversion (the method can be applied to any multimodel forward modeling problems), and (2) an exponential FD modeling scheme developed based on the oscillatory and exponentially decaying behaviors of the EM fields to get more accurate results or to reduce modeling time. I will then conclude the talk by presenting an application of CSEM method for subduction zone imaging.
Learn more about Dr. Jaysaval.
Host: Adrien Arnulf
Brown Bag Seminar: Chris Lowery
Start:March 7, 2018 at 12:00 pm
End:
March 7, 2018 at 1:00 pm
Location:
PRC ROC Room 1.603
Contact:
Sophie Goliber, sgoliber@utexas.edu
Informal weekly presentations by UTIG students and researchers. Bring your lunch!
Brown Bag Seminar: John Kappleman
Start:March 7, 2018 at 12:00 pm
End:
March 7, 2018 at 1:00 pm
Location:
PRC ROC Room 1.603
Contact:
Sophie Goliber, sgoliber@utexas.edu
Informal weekly presentations by UTIG students and researchers. Bring your lunch!
DeFord Lecture: Yajing Liu
Start:March 8, 2018 at 4:00 pm
End:
March 8, 2018 at 5:00 pm
Location:
JGB 2.324
UTIG Seminar Series: Kaustubh Thirumalai, Brown University
Start:March 9, 2018 at 10:30 am
End:
March 9, 2018 at 11:30 am
Location:
PRC ROC Room 1.603
Contact:
Anisa Abdulkader, aabdulkader@ig.utexas.edu, 512-471-0417
Title: Past and Future Extremes of the Indian Ocean
Abstract: Climate variability in the Indian Ocean exerts a strong influence on the densely populated countries around its rim. Widespread droughts, wildfires, and flooding have been attributed to ocean-atmosphere dynamics in the Indian Ocean. One such event occurred during the devastating heat extreme of 2016 over Southeast Asia that caused extensive socioeconomic disarray. I will show how climate variability driven by the El Niño/Southern Oscillation (ENSO) and modulated by the Indian Ocean proved to be a causal factor for the 2016 heat event, and how global warming worsened the impact of this extreme. Apart from exacerbating ENSO-driven impacts, increasing levels of greenhouse gases are also expected to fundamentally alter the mean climate of the Indian Ocean. Pronounced changes in the background climate could lead to stronger climate variability in the Indian Ocean; however, model projections remain highly uncertain. I will present new proxy measurements and model simulations to investigate Indian Ocean climate variability during the Last Glacial Maximum (LGM), a period when background changes followed a pattern similar to that expected from greenhouse warming. The ?¹?O analysis of individual foraminiferal shells reveal immense increases in sea-surface temperature variability in the equatorial Indian Ocean, which we attribute to increased seasonality, but also to stronger and more frequent year-to-year warming and cooling events. These extremes are amplified by enhanced air-sea coupling induced by changes in background ocean conditions and demonstrate that the Indian Ocean can harbor even more intense extremes than those observed during modern history.
Learn more about Dr. Thirumalai.
Host: Pedro Di Nezio
DeFord Lecture: Kayla Iacovino
Start:March 22, 2018 at 4:00 pm
End:
March 22, 2018 at 5:00 pm
Location:
JGB 2.324
UTIG Seminar Series: David Talmy, MIT
Start:March 23, 2018 at 10:30 am
End:
March 23, 2018 at 11:30 am
Location:
PRC ROC Room 1.603
Contact:
Anisa Abdulkader, aabdulkader@ig.utexas.edu, 512-471-0417
Title: What controls virus dynamics in global ocean microbial ecosystems?
Abstract: Viral infection in microbial ecosystems influences carbon and nutrient flow throughout the global ocean. In this presentation, simple biophysical and metabolic controls on viral interactions with bacterial and algal hosts will be considered. These insights will be used to explore virus dynamics in a microbial ecosystem model, embedded in a global ocean general circulation framework. The model predicts virus abundance patterns qualitatively consistent with large-scale variation in ocean color, and primary productivity. Results will be presented from a case study in the North Atlantic, exploring competition among viruses that infect the marine calcifier Emiliania Huxleyi. The coupled framework is a base on which to consider virus impacts on global carbon cycling and biogeochemistry.
Learn more about Dr. Talmy.
Host: Patrick Heimbach
DeFord Lecture: Giulio Di Toro
Start:March 27, 2018 at 4:00 pm
End:
March 27, 2018 at 5:00 pm
Location:
JGB 2.324
Brown Bag Seminar: Reynaldy Fifariz
Start:March 28, 2018 at 12:00 pm
End:
March 28, 2018 at 1:00 pm
Location:
PRC ROC Room 1.603
Contact:
Sophie Goliber, sgoliber@utexas.edu
Informal weekly presentations by UTIG students and researchers. Bring your lunch!
DeFord Lecture Series: . David Boutt
Start:March 29, 2018 at 4:00 pm
End:
March 29, 2018 at 5:00 pm
Location:
JGB 2.324
UTIG Seminar Series: An Nguyen, UT ICES
Start:March 30, 2018 at 10:30 am
End:
March 30, 2018 at 11:30 am
Location:
PRC ROC Room 1.603
Contact:
Anisa Abdulkader, aabdulkader@ig.utexas.edu, 512-471-0417
Title: Arctic Ocean-Sea Ice State Estimation and Observing Network Assessment
Abstract: The Arctic region has experienced increase in air temperature at approximately twice the global rate and rapid decline in sea ice cover, with large consequence for its physical state and ecosystem. This makes the ability to understand and model the Arctic ocean-sea ice system mean state and changes an urgent task. Since the turn of the century, availability of satellite and in situ observations of basin-scale sea ice thickness, sub-surface ocean hydrography, and ocean integrated mass has facilitated data-model synthesis. In this talk, I will discuss the progress of the Arctic Subpolar gyre sTate Estimate (ASTE), a medium-resolution regional ocean-sea ice synthesis obtained using the non-linear inversion tools developed within the ECCO consortium. Individual and collective contributions of data sets, including GRACE and Ice Tethered Profilers, to the improvement of the state estimate hydrography and internal mixing will be discussed. In addition, adjoint sensitivity will be used to illustrate the dependence of important model parameters on the locations of existing and potentially new observations in the Arctic. Lastly, building on ASTE, preliminary results from a forward high resolution regional Arctic run will be used to investigate recent changes in the Arctic ocean including enhanced Arctic “Atlantification” and enhanced energy input from surface winds.
Learn more about An Nguyen
Host: Ginny Catania
DeFord Lecture | Dr. Richard TaylorApril, 25 2024Time: 4:00 PM - 5:00 PMLocation: Boyd Auditorium (JGB 2.324) Adapting to the Amplification of Climate Extremes Through Freshwater Capture: Evidence from the Tropics by Dr. Richard Taylor, Department of Geography, University College London Abstract: In low-income countries of the tropics undergoing rapid growth, global warming presents challenges to the expansion and sustainability of water supplies required to advance progress toward the United Nations’ Sustainable Development Goals. Substantial uncertainty persists in projections of precipitation under climate change. A widely observed impact, pronounced in the tropics, is the intensification of precipitation comprising a transition towards fewer but heavier rainfalls. How does this transition impact terrestrial water balances? How might these changes influence freshwater demand? I will interrogate these questions and review mounting empirical evidence from the tropics of the resilience to climate change of groundwater resources, which act as a natural inter-annual store of freshwater supporting adaptation to the amplification climate extremes. Presented evidence includes case studies and local-to-regional scale analyses from tropical Africa and the Bengal Basin of South Asia. Outcomes emphasize the interconnected nature of surface water and groundwater as well as the value of groundwater as a natural, distributed store of freshwater. This insight provides a platform to explore more equitable and sustainable water development pathways resilient to climate change. |
UTIG Seminar Series: Cornelia Rasmussen, UTIGApril, 26 2024Time: 10:30 AM - 11:30 AMLocation: PRC 196/ROC 1.603 Speaker: Cornelia Rasmussen, Research Associate, University of Texas Institute for Geophysics Host: Krista Soderlund Title: The Emerging Field Of Position-Specific Isotope Analysis: Applications in chemical forensics, exobiology, geo- and environmental sciences Abstract: Complex organics can be found all over our solar system and within each living thing on our planet, be it as part of its physiology or as a contaminant. However, different processes can lead to the formation of chemical identical molecules. This makes answering a number of scientific questions challenging. One example is distinguishing between biotic and abiotic molecules, hence hindering life detection on early Earth but especially on other planetary bodies, such as on Mars, Titan, Enceladus and on meteorites where organics have been detected. Moreover, tracing molecules as they move through the environment can be demanding, yet is essential in studying the flow of organic molecules as well as correlating pollutants with their source. Novel tools to address these challenges are currently being developed. Especially, the emerging field of position-specific isotope analysis is beginning to grant access to the unique intramolecular carbon (13C/12C) isotope fingerprint preserved in complex molecules. This fingerprint can be applied in various scientific disciplines, ranging from forensics to exobiology, geo- and environmental sciences, including geo health. Nuclear magnetic resonance spectroscopy (NMR) has the potential to become a key player in this research area, as it allows the analysis of organics within complex mixtures, all without the need to fragment the molecule into single carbon units or the combustion of the molecule of interest. We have been developing several NMR tools that allow us to investigate the intramolecular carbon isotope distribution within various molecule classes and to test the central hypothesis that the position-specific carbon isotope distribution within complex organics depends on a molecule’s source and formation history. |
Planetary Habitability Seminar SeriesApril, 29 2024Time: 1:00 PM - 2:00 PMLocation: PMA 15.216B UT Center for Planetary Systems Habitability Seminar Series. See website for speaker schedule and more details: View Events Join remotely: https://utexas.zoom.us/j/94052130734 In person: Classroom 15.216B, Physics, Math and Astronomy Bldg. UT Austin, Department of Astronomy 2515 Speedway, Stop C1400 Austin, Texas 78712-1205 |
UTIG Discussion Hour: Kristian Chan - PhD Talk (UTIG)April, 30 2024Time: 2:00 PM - 3:00 PMLocation: ROC 2.201 |