Events
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26 | 27 | 28 | 29 | 30 | 31 |
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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
UTIG Special Seminar: John Aiken, University of OsloJune, 20 2025Time: 11:00 AM - 12:00 PMLocation: UTIG Conference Room PRC 196/ROC 2.201 Speaker: John Aiken, Researcher, NJORD Centre for Studies of the Physics of the Earth, University of Oslo Host: Thorsten Becker Title: SerpRateAI: Adventures in Data Mining the Oman Ophiolite Abstract: Ophiolites are oceanic and near surface mantle rocks that have been thrust onto the continents. Some ophiolites like peridotite alter in low-temperature conditions in the presence of water absorbing and mineralizing CO2, emitting byproducts such as elemental hydrogen and methane. This process, known as carbonation and serpentinization, is one of the many alteration chains that can be used for CO2 sequestration and also has been linked to biogenesis, and crustal changes in mid-ocean ridges and subduction zones. To study how these rocks change the Oman Drilling Project created the Multi-borehole Observatory (MBO). The hope was by observing this area we can understand how it could be better utilized for scientific understanding and societal problems such as climate change. The MBO has produced tens of terabytes of multi-modal data including time series observations such as pore pressure changes, temperature, and seismic observations, core photos and x-ray tomography, and a large amount of other logging data. This talk will be about my adventure over the last few years in data mining these data. It will include successes and failures, my thought processes as to how I went about mining these data, and what the future of data mining the subsurface could look like. Across this talk, I will show evidence from various investigations that the MBO observes that the near subsurface is in an evolving state of change that is, perhaps, being driven by the climate. |