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Title:   Author  item
                                            McCarty, Gregoryitem
                                            Mookherji, Swatiitem
                                            Angier, Jonathan
  Submitted to: Annual American Geophysical Union Hydrology Days
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 12/20/2000
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: Measurement of dissolved N gases permits direct assessments of groundwater denitrification.  For shallow wetland groundwater systems, however, significant production of N gas from denitrification will readily cause the total pressure of dissolved gases to exceed the hydrostatic pressure resulting in loss of dissolved gas through bubble formation (degassing).  The changes in dissolved Ar content within a flow path of groundwater provides indication of degassing and permits calculation of the amounts of dissolved gas loss by this mechanism.  In the wetland ecosystem studied, the flow paths of groundwater which indicated nitrate attenuation also showed attenuation of Ar.  The use of Ar attenuation to calculate the amounts of degassed N2 showed that most of the N gas produced by denitrification in the ecosystem was removed from groundwater by degassing. The N gas production calculated by this procedure largely accounted for  nitrate N loss within the system indicating that denitrification was the primary mechanism for nitrate removal from water in the wetland.


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