Item talk:Q46482

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usgs_staff_profile:

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   url: https://www.usgs.gov/staff-profiles/karl-b-haase
   timestamp: '2024-01-30T15:49:28.475140'
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 profile:
   name: Karl B Haase, Ph.D.
   name_qualifier: null
   titles:
   - Research Chemist
   - Research Chemist
   organizations:
   - !!python/tuple
     - Water Resources Mission Area
     - https://www.usgs.gov/mission-areas/water-resources
   - !!python/tuple
     - Reston Stable Isotope Laboratory (RSIL)
     - https://www.usgs.gov/labs/reston-stable-isotope-laboratory
   email: khaase@usgs.gov
   orcid: 0000-0002-6897-6494
   intro_statements:
   - Dr. Karl Haase is the technical lead of the USGS Reston Groundwater Dating Lab,
     and a Research Chemist with the USGS Water Resources Mission Area.
   expertise_terms:
   - Environmental tracers research
   - Atmospheric Chemistry
   - Gas Chromatography (GC) Method and Design
   - Mass Spectrometer Systems Design, Development and Integration
   - Vacuum Systems
   - Process and Instrumentation Automation
   - Trace Gas and Dissolved Trace Gas Analysis
   - Air Water Interaction
   - Groundwater Dating
   - Electronics Prototyping
   professional_experience: []
   education: []
   affiliations: []
   honors: []
   abstracts: []
   personal_statement: I am a research chemist studying methods of groundwater age
     determination. I am generally interested in the relationships between atmospheric
     gases and groundwater, as mediated by the interactions in the vadose zone, the
     layer of the ground that water must pass through before it enters an aquifer.I
     have a background in experimental atmospheric chemistry, having worked with
     several groups on topics including ocean fertilization, biogeochemical impacts
     to atmospheric chemistry, oceanic emissions of halocarbons to the atmosphere,
     instrument validation studies, long term observations, anthropogenic emissions,
     and air quality measurements.Dissolved Gases are important chemical tracers
     in groundwater systems. They provide information about groundwater age, aquifer
     mixing, and the climate conditions when water entered the aquifer. This information
     can be used to study issue of groundwater availability, quality, and quantity.
     Additionally direct measurements of these properties can be used to validate
     groundwater model output and improve model algorithms, allowing more accurate
     assessment of aquifer systems. I have designed, constructed several noble gas
     mass spectrometer and GC systems to measure dissolved fixed gases (O2, N2, He,
     Ne, Ar, Kr, and Xe) to assess groundwater recharge temperatures more accurately,
     and I am studying the behavior of various anthropogenic compounds in the groundwater
     system.In pursuit of these research goals, I have developed novel and customized
     analytical systems and sensors for research and production operations. Among
     others, these include an automated economical quadruple mass spectrometer based
     noble gas analyzer, a dual channel GC-FID-AED system for measuring trace hydrofluorocarbons
     (as novel groundwater age tracers) and trace hydrocarbons (to better understand
     hydrocarbon geochemistry, a highly automated multi-port noble gas analyzer for
     tritium-helium dating and noble gas concentrations in groundwater, a self contained
     low cost pCO2 sensor, and GC-TCD system for measurements of He/Ne in groundwater
     samples.