Electrical Measurements on the Greenland Ice Sheet Project 2 Core

The Greenland Ice Sheet Project 2 (GISP2) electrical conductivity measurement (ECM) record is an indication of the concentration of H+ in the core. The ECM detected seasonal variations in the nitrate concentration of the core which were used to assist in dating the core by annual layer counting. Volcanic eruptions that produce acidic aerosols are recorded in the ECM record. Evidence of biomass burning is detected by the ECM because fire-related ammonium emissions neutralize the acids in the core. Rapid climate transitions associated with the Younger Dryas and Dansgaard/Oeschger interstadial events alter the concentration of alkaline dust and are detected by the ECM. The ECM has been used to develop stratigraphic ties between the GISP2 and the Greenland Ice Core Project cores. Users of the data should be aware of some instrument-related artifacts in the ECM record

Dating the Siple Dome (Antarctica) Ice Core By Manual and Computer Interpretation of Annual Layering

The Holocene portion of the Siple Dome (Antarctica) ice core was dated by interpreting the electrical, visual and chemical properties of the core. The data were interpreted manually and with a computer algorithm. The algorithm interpretation was adjusted to be consistent with atmospheric methane stratigraphic ties to the GISP2 (Greenland Ice Sheet Project 2) ice core, (BE)-B-10 stratigraphic ties to the dendrochronology C-14 record and the dated volcanic stratigraphy. The algorithm interpretation is more consistent and better quantified than the tedious and subjective manual interpretation

Dating the Siple Dome (Antarctica) ice core by manual and computer interpretation of annual layering

The Holocene portion of the Siple Dome (Antarctica) ice core was dated by interpreting the electrical, visual and chemical properties of the were interpreted manually and with a computer algorithm.The algorithm was adjusted to be consistent with atmospheric methane stratigraphic (Greenland Ice Sheet Project 2) ice core, ¹⁰Be stratigraphic ties to the ¹⁴C record and the dated volcanic stratigraphy.The interpretation is more consistent and better quantified than the tedious and subjective manual interpretation

Estimation of hydraulic heads with constraints on head gradients across no flow boundaries and their effect on transmissivities estimated from inverse modelling

Online access for this thesis was created in part with support from the Institute of Museum and Library Services (IMLS) administered by the Nevada State Library, Archives and Public Records through the Library Services and Technology Act (LSTA). To obtain a high quality image or document please contact the DeLaMare Library at https://unr.libanswers.com/ or call: 775-784-6945.Techniques to estimate semivariogram parameters were investigated. These techniques are applied to the determination of semivariogram parameters used in the estimation of hydraulic head values at node locations from measured head data. The resulting hydraulic head estimates were used in an inverse groundwater flow model