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    Isotopic composition of stable carbon and carbon dioxide concentration of atmosphere in streambeds near Tombstone, Arizona

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    Author
    Riddle, Jeffrey Scott.
    Issue Date
    1984
    Keywords
    Hydrology.
    Radiocarbon dating.
    Groundwater -- Arizona -- Cochise County -- Dating.
    Groundwater -- Arizona -- Tombstone Region -- Dating.
    Committee Chair
    Simpson, Eugene S.
    
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Gas samples were taken at approximately a meter deep about every 30 days for a year at three sites from ephemeral streambeds of the Walnut Gulch Watershed near Tombstone, Arizona. The streambeds are composed of sands and gravels of volcanic or granitic origin and free of vegetation. Two of the sites are underlain by a conglomeritic layer from 90 cm below streambed surface to some unknown depth. The data from these two sites had CO₂ concentration values ranging from .39% vol. to .02% vol. and δ¹³C values ranging from -9.07%. to -19.02%0. The third site has no evidence of a conglomeritic layer near the streambed surface. The CO₂ concentration values ranged from .94% vol. to .29% vol. and δ¹³C values ranged from -17.53%. to -20.75%.. All δ¹³C values are with respect to PDB. Changes of CO₂ concentration and δ¹³C values were related to flood events, physical characteristics of the streambed and banks, type of bank vegetation, season, and fractionation of ¹³C and ¹²C between gaseous CO₂ and bicarbonate. Atmospheric CO₂ contributed significantly to the streambed atmosphere following flood events; the relative importance of atmospheric CO₂ diminished as a function of the ease with which root-respired CO₂ recharged a site.
    Type
    Thesis-Reproduction (electronic)
    text
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Hydrology and Water Resources
    Graduate College
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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