esm223_12_Reading_Rose_et_al_Isotopes_for_NV_Regional_Recharge

Esm223_12_Reading_Rose_et_al_Isotopes_for_NV_Regional_Recharge

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UCRL-JC-132514 PREPRINT Isotopic Investigation of Recharge to a Regional Groundwater Flow System, Great Basin, Nevada, USA T.P. Rose M.L. Davisson R.E. Criss D.K. Smith This paper was prepared for submittal to the International Symposium on Isotope Techniques in Water Resources Development and Management Vienna, Austria May 10 - 14, 1999 May 1999 This is a preprint of a paper intended for publication in a journal or proceedings. Since changes may be made before publication, this preprint is made available with the understanding that it will not be cited or reproduced without the permission of the author.
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DISCLAIMER This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implie& or assumesanylegalliabilityorrgponsibiiityfortheafcuracy,completeness,orusefulness of any information, apparatus, product, or process disclosed, or represents that its use wouldnotinfringeprivately owned rights. Referenceherein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for adveriising or product endorsement purposes.
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ISOTOPIC INVESTIGATION OF RECHARGE TO A REGIONAL GROUNDWATER FLOW SYSTEM, GREAT BASIN, NEVADA, USA T.P. Rose*, M.L. Davisson*, R.E. Criss**, D.K. Smith* *Analytical and Nuclear Chemistry Division, Lawrence Livermore National Laboratory, Livermore, California, United States of America **Department of Earth and Planetary Sciences, Washington University, St. Louis, Missouri, Abstract Groundwater recharge processes were investigated in central Nevada by examining the relationships between the stable isotope (SD and 8 ”O) compositions of snowfall, snowmelt, alpine spring waters, and regional groundwaters. Snowmelt infiltration is inferred to he the dominant source of groundwater recharge in this region. Bulk snow cores collected throughout central Nevada near the time of maximum accumulation have SD-6t80 pairs that plot subparallel to the global meteoric water line (GMWL), but have negative d-values, implying kinetic isotope enrichments. Heavy isotope enrichments occur at the base of snowpacks due to fractionation during snow metamorphism, sometimes resulting in remarkably systematic isotopic variations. Ice crystals in the soil immediately beneath the snowpack can be strongly depleted in heavy isotopes relative to the overlying snow, implying fractionation or exchange with the snowpack. Late season ablation processes tend to homogenize isotopic variations between snowpack layers, and cause the bulk isotopic composition of the snowpack to become enriched in I80 by 2-3%0 relative to the composition during peak accumulation. The dynamic evolution
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This note was uploaded on 08/06/2008 for the course ESM 235 taught by Professor Dunne during the Winter '08 term at UCSB.

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Esm223_12_Reading_Rose_et_al_Isotopes_for_NV_Regional_Recharge

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