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Browsing Research and Publications - Department of Geological Sciences by Title

Now showing items 1-20 of 34

An approach to quantifying the efficiency of a Bayesian filter

Nearing, Grey S.; Gupta, Hoshin V.; Crow, Wade T.; Gong, Wei (American Geophysical Union, 2013-04-26)

Data assimilation is the Bayesian conditioning of uncertain model simulations on observations to reduce uncertainty about model states. In practice, it is common to make simplifying assumptions about the prior and posterior ...
Assimilating remote sensing observations of leaf area index and soil moisture for wheat yield estimates: An observing system simulation experiment

Nearing, G. S.; Crow, W. T.; Thorp, K. R.; Moran, M. S.; Reichle, R. H.; Gupta, H. V. (American Geophysical Union, 2012-05-17)

Observing system simulation experiments were used to investigate ensemble Bayesian state-updating data assimilation of observations of leaf area index (LAI) and soil moisture (theta) for the purpose of improving single-season ...
Comment on "A blueprint for process-based modeling of uncertain hydrological systems" by Alberto Montanari and Demetris Koutsoyiannis

Nearing, Grey (American Geophysical Union, 2014-07-24)
Crustal and upper-mantle structure beneath ice-covered regions in Antarctica from S-wave receiver functions and implications for heat flow

Ramirez, C.; Nyblade, A.; Hansen, S. E.; Wiens, D. A.; Anandakrishnan, S.; Aster, R. C.; Huerta, A. D.; Shore, P.; Wilson, T. (Oxford University Press, 2016)

S-wave receiver functions (SRFs) are used to investigate crustal and upper-mantle structure beneath several ice-covered areas of Antarctica. Moho S-to-P (Sp) arrivals are observed at similar to 6-8 s in SRF stacks for ...
Crustal structure beneath the Northern Transantarctic Mountains and Wilkes Subglacial Basin: Implications for tectonic origins

Hansen, Samantha E.; Kenyon, Lindsey M.; Graw, Jordan H.; Park, Yongcheol; Nyblade, Andrew A. (American Geophysical Union, 2016-02-13)

The Transantarctic Mountains (TAMs) are the largest noncollisional mountain range on Earth. Their origin, as well as the origin of the Wilkes Subglacial Basin (WSB) along the inland side of the TAMs, has been widely debated, ...
Debates—The future of hydrological sciences: A (common) path forward? Using models and data to learn: A systems theoretic perspective on the future of hydrological science

Gupta, Hoshin V.; Nearing, Grey S. (2014-06-02)

Key Points: Discovery can be advanced by taking a perspective based in Information Theory. Much can be gained by focusing on the a priori role of Process Modeling. System Parameterization can result in information loss.
delta N-15 Values in Crassostrea virginica Shells Provides Early Direct Evidence for Nitrogen Loading to Chesapeake Bay

Black, H. D.; Andrus, C. F. T.; Lambert, W. J.; Rick, T. C.; Gillikin, D. P. (Nature Portfolio, 2017-03-10)

Crassostrea virginica is one of the most common estuarine bivalves in the United States' east coast and is frequently found in archaeological sites and sub-fossil deposits. Although there have been several sclerochronological ...
El Nino Impact on Mollusk Biomineralization-Implications for Trace Element Proxy Reconstructions and the Paleo-Archeological Record

Perez-Huerta, Alberto; Etayo-Cadavid, Miguel F.; Andrus, C. Fred T.; Jeffries, Teresa E.; Watkins, Clifton; Street, Shane C.; Sandweiss, Daniel H. (PLOS, 2013-02-06)

Marine macroinvertebrates are ideal sentinel organisms to monitor rapid environmental changes associated with climatic phenomena. These organisms build up protective exoskeletons incrementally by biologically-controlled ...
Ensembles vs. information theory: supporting science under uncertainty

Nearing, Grey S.; Gupta, Hoshin V. (Springer, 2018)

Multi-model ensembles are one of the most common ways to deal with epistemic uncertainty in hydrology. This is a problem because there is no known way to sample models such that the resulting ensemble admits a measure that ...
Estimating information entropy for hydrological data: One-dimensional case

Gong, Wei; Yang, Dawen; Gupta, Hoshin V.; Nearing, Grey (American Geophysical Union, 2014-06-19)

There has been a recent resurgence of interest in the application of Information Theory to problems of system identification in the Earth and Environmental Sciences. While the concept of entropy has found increased ...
EVALUATING MOBILITY, MONUMENTALITY, AND FEASTING AT THE SAPELO ISLAND SHELL RING COMPLEX

Thompson, Victor D.; Andrus, C. Fred T. (Cambridge University Press, 2011)

Two of the most salient anthropological questions regarding southeastern shell ring sites are related to the season(s) that they were occupied and whether or not the deposits represent monumental constructions and/or ...
Evaluating the Utility of Satellite Soil Moisture Retrievals over Irrigated Areas and the Ability of Land Data Assimilation Methods to Correct for Unmodeled Processes

Kumar, S. V.; Peters-Lidard, C. D.; Santanello, J. A.; Reichle, R. H.; Draper, C. S.; Koster, R. D.; Nearing, G.; Jasinski, M. F. (2015-11-06)

Earth's land surface is characterized by tremendous natural heterogeneity and human-engineered modifications, both of which are challenging to represent in land surface models. Satellite remote sensing is often the most ...
Fundamental questions and applications of sclerochronology: Community-defined research priorities

Trofimova, Tamara; Alexandroff, Stella J.; Mette, Madelyn J.; Tray, Elizabeth; Butler, Paul G.; Campana, Steven E.; Harper, Elizabeth M.; Johnson, Andrew L. A.; Morrongiello, John R.; Peharda, Melita; Schoene, Bernd R.; Andersson, Carin; Andrus, C. Fred T.; Black, Bryan A.; Burchell, Meghan; Carroll, Michael L.; DeLong, Kristine L.; Gillanders, Bronwyn M.; Gronkjaer, Peter; Killam, Daniel; Prendergast, Amy L.; Reynolds, David J.; Scourse, James D.; Shirai, Kotaro; Thebault, Julien; Trueman, Clive; de Winter, Niels (Academic Press, 2020)

Horizon scanning is an increasingly common strategy to identify key research needs and frame future agendas in science. Here, we present the results of the first such exercise for the field of sclerochronology, thereby ...
Hydrologic response to precipitation pulses under and between shrubs in the Chihuahuan Desert, Arizona

Moran, M. S.; Hamerlynck, E. P.; Scott, R. L.; Stone, J. J.; Collins, C. D. Holifield; Keefer, T. O.; Bryant, R.; DeYoung, L.; Nearing, G. S.; Sugg, Z.; Hymer, D. C. (American Geophysical Union, 2010-10-08)

Observations of the temporal and spatial distribution of poststorm soil moisture in open shrublands and savannas are limited, yet they are critical to understanding the interaction and feedback between moisture distribution ...
The impact of vertical measurement depth on the information content of soil moisture times series data

Qiu, Jianxiu; Crow, Wade T.; Nearing, Grey S.; Xingguo, Mo; Liu, Suxia (2014-07-25)
Investigating the P wave velocity structure beneath Harrat Lunayyir, northwestern Saudi Arabia, using double-difference tomography and earthquakes from the 2009 seismic swarm

Hansen, Samantha E.; DeShon, Heather R.; Moore-Driskell, Melissa M.; Al-Amri, Abdullah M. S. (American Geophysical Union, 2013-09-12)

In 2009, a swarm of more than 30,000 earthquakes occurred beneath the Harrat Lunayyir lava field in northwest Saudi Arabia. This event was just one of several seismic swarms to occur in this region over the past decade. ...
Nonparametric triple collocation

Nearing, Grey S.; Yatheendradas, Soni; Crow, Wade T.; Bosch, David D.; Cosh, Michael H.; Goodrich, David C.; Seyfried, Mark S.; Starks, Patrick J. (American Geophysical Union, 2017-07-07)

Triple collocation has found widespread application in the hydrological sciences because it provides information about the errors in our measurements without requiring that we have any direct access to the true value of ...
Origin and Application of the Twinned Calcite Strain Gauge

Groshong, Richard H., Jr. (MDPI, 2021)

This paper is a personal account of the origin and development of the twinned-calcite strain gauge, its experimental verification, and its relationship to stress analysis. The method allows the calculation of the ...
Oxygen isotope record of the 1997-1998 El Nino in Peruvian sea catfish (Galeichthys peruvianus) otoliths

Andrus, CFT; Crowe, DE; Romanek, CS (American Geophysical Union, 2002-10-11)

[1] Sagittal otoliths of the Peruvian sea catfish Galeichthys peruvianus were collected from the north coast of Peru during and after the 1997-1998 El Nino. The otoliths were analyzed via laser microprobe and micromilling ...
Prolonged Metamporphism During Long-Lived Terrane Accretion: Sm-Nd and U-Pb Zircon Geochronology and Pressure-Temperature Paths from the Salmon River Suture Zone, West-Central Idaho, USA

McKay, Matthew P.; Bollen, Elizabeth M.; Gray, Keith D.; Stowell, Harold; Schwartz, Joshua J. (2017-06-30)

The Salmon River suture zone of western Idaho (USA) records mid-crustal metamorphism and deformation associated with orogenesis during Mesozoic accretion of volcanic arc terranes to western Laurentia. We present petrographic ...

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Browsing Research and Publications - Department of Geological Sciences by Title

Browsing Research and Publications - Department of Geological Sciences by Title

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